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From to , Mr. His prior experience also includes serving as the corporate controller for Zenith Data Systems Corporation and finance manager positions with Honeywell, Inc.

Flock is an year veteran with adidas Group AG, where he has held numerous executive level positions for the company throughout Europe, Asia and North America.

Collins previously held a number of financial leadership positions at The Walt Disney Company and co-founded a technology-focused venture capital firm.

Spotlight Innovation, Inc. Hostelley has spent twenty years as a consultant in the health field. During his more than twenty years in business he has served as CEO, CFO and board member of several publicly traded companies.

Sibling Group Holdings, Inc. Nutroganics, Inc. Scott is a business executive with a 22 year career of financial management and C-level leadership across a range of industries.

Most recently, Mr. Scott was the senior financial executive at a Middle East based government services organization with a roll-up strategy led by many former Veridian Systems executives.

Novatel Wireless, Inc. In , Mr. Throughout his career, Mr. He has also served as board director for public and private companies. LeMahieu will join the organization in August Epic Health Services, Inc.

Operations for United Surgical Partners. Prior to his appointment as CFO, Mr. Vogensen held multiple positions of increasing scope and responsibility with Michaels Stores, Inc.

Before joining Michaels, Mr. Energy Recovery Inc. Joel joined Energy Recovery in January and has held several positions at the company, including most recently serving as Vice President of Finance since June Bob Evans Farms, Inc.

Loyalty Corporation, in various financial and administrative senior management roles. Cytec Industries Inc.

Prior to this position, Mr. Since May , Mr. Prior to Mirion, Mr. Glassdoor , announced the appointment of Adam C.

Spiegel as chief financial officer. Spiegel also previously served as CFO for two early-stage life science companies. Earlier in his career, he was an investment banker.

Vera Bradley, Inc. In the ten years prior to joining the Company, Sierks worked in the medical device industry in finance and accounting positions of increasing responsibility, including Vice President and Corporate Controller of Biomet and Director of Accounting and U.

Shared Services at Boston Scientific Corporation. He has also held a senior finance position at truckloadsusa. Kindred Healthcare, Inc.

Farber succeeds Richard A. Lechleiter , whose previously announced retirement from the Company was effective January 15, Farber has more than 20 years of healthcare experience, including serving as Chief Financial Officer for Tenet Healthcare Corp.

Most recently Mr. Farber led the successful financial restructuring of Rural Metro, and has been involved in various private equity efforts, including as a healthcare executive-in-residence with Warburg Pincus.

Farber began his career as an investment banker with J. Drillock , Vice President and Chief Financial Officer, has announced his intention to retire from Cytec effective December 31, , completing a 36 year career with Cytec and its predecessor.

Broadridge Financial Solutions, Inc. Sheldon will remain with the Company in an advisory role through April 11, to assist with the transition.

During Mr. Both Mr. Liberatore and Mr. Lisa will continue to serve in these roles during the transition. This site is not gaining any traffic from these keywords.

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Powdered Activated Carbon PAC has shown promise as a treatment method to reduce pollutants but challenges remain in effectively applying PAC to a wastewater stream.

Of particular concern is the application of PAC to existing facilities in which the existing hydraulic profile does not allow the use of large sedimentation tanks normally associated with PAC use in potable water applications.

While mostly targeted at tertiary treatment, alternate processes such as primary filtration and storm water treatment are now being pursued.

It is suspected that CMF will capture and retain Powdered Activated Carbon PAC in which the two processes could be combined in order to produce an energy friendly and cost competitive approach to pollutant reductions.

This research examines the feasibility of application of PAC into existing hydraulic profiles by using inline injection and its quick removal by Cloth Media Filtration CMF.

A bench sized cloth media filter was constructed and then operated in a side stream manner with a real-world wastewater treatment train.

The results show excellent performance of the designed CMF. It is suspected microbial mediated iron reduction should be responsible for the iron release.

The purpose of this research is to characterize the microbial community in the soils nearby landfills in Northwest Florida to determine the dominant bacterial species.

The iron rich soil in Northwest Florida and leachate from landfills are considered the primary contributors to the Show more Elevated iron concentrations have been observed in the groundwater downgradient of the landfills in Northwest Florida.

The iron rich soil in Northwest Florida and leachate from landfills are considered the primary contributors to the elevated iron concentrations observed in groundwater.

The leachate has potential for providing carbon sources for the reaction, allowing the bacteria to more rapidly reduce the iron in the soil.

In this research, the soils from sixteen landfills fifteen Northwest Florida counties were characterized through sieve analysis and the bacteria were quantified and identified.

Traditional plate count method was used for bacterial quantification and morphology by means of microscopy and Polymerase Chain Reaction PCR were utilized for bacterial identification.

The plate counts resulted in 0. The identification through morphology found typical rod and cocci bacteria to be the dominating species.

Although potentially iron reducing bacteria were identified through morphology, they were not confirmed through DNA analysis.

They need further enriched culturing in order to observe obvious iron reducing. The PCR analysis identified typical soil bacteria, Bacillus subtilis, Bacillus cereus, Bacillus thuringiensis, and Pseudomonas aeruginosa.

These bacteria are common soil bacteria that are well characterized. The sieve analysis of the soils showed a correlation of increased bacterial population in well-graded soils.

The soils also showed an increase in water content when there was a higher percentage of finer particles. However, increased water content and finer particles resulted in lower bacterial populations.

Further studies are currently underway to quantify the iron release from the soils and the effects the leachate have on the bacterial processes.

In the United States ethanol is produced predominantly from corn and has made headlines as a popular green energy, driven both politically and geographically.

Green energy is defined as an energy that has little or no negative environmental impacts. The purpose of this study is to determine if ethanol is really a green energy.

This determination can be made by quantifying the greenhouse gas emissions produced by ethanol production using Show more Ethanol is a controversial source of alternative fuel.

This determination can be made by quantifying the greenhouse gas emissions produced by ethanol production using the LCA Life Cycle Assessment method of analysis.

Using equivalent units, carbon dioxide emissions can be quantified and compared to other sources of alternative energies. Carbon footprinting is mainly used to understand the impacts humans have individually and as a mass on the environment.

It can be computed and expressed as a quantity towards the computation of greenhouse gas contribution. In the case of ethanol, a carbon footprint can be developed by looking at the physical life cycle of a kernel of corn, cane of sugar or bushel of switchgrass.

Comprehensively, the ethanol life cycle can be divided into four main parameters. The first parameter is feedstock, followed by technology, third is capital and the final parameter is off take.

While each parameter is singularly important, this study focuses on greenhouse gas emissions. It was determined that in comparison, corn ethanol greenhouse gas emissions far exceed the greenhouse gas emission of both sugarcane and switchgrass cellulosic ethanol for any case.

In the case where LCA is carried through distribution and use of ethanol, sugarcane ethanol is the less greenhouse gas emissive.

In the case where the LCA stops at ethanol production, switchgrass is the less greenhouse gas emissive. It is important to note, however, that switchgrass cellulosic ethanol is in its infancy as of this writing and data provided is largely projected on the part of the respective researcher.

When conditions permit, microbial mediated iron reduction and release may be the mechanism for elevated iron observations in the groundwater. In regions near the landfills, there is also a possibility of iron release due to Show more Landfill leachate is blamed for elevated levels of iron in the groundwater monitoring wells downgradient of unlined landfills.

The objective of this research is to investigate whether, and to what extent, microbial activities are responsible for iron release in the regions near landfills in Northwest Florida.

For microbial mediated iron reaction processes, we want to testify whether it is an iron reducing process or sulphate reducing process iron oxidation.

The methodology of this research is to react simulated leachate with soils collected from Northwest Florida in the absence and presence of microbial species cultured from landfill regions where elevated groundwater iron concentrations have been observed.

Sixteen landfills of fifteen Northwest Florida counties were sampled and the soil iron content of these samples was quantified.

Iron release experiments were then carried out using the sampled soil reacting with leachate samples in the presence of iron reducing bacteria that was pre-cultured using iron rich soil as the base consortia.

The variations in pH throughout the experiments were monitored to study the correlation between iron concentration and pH.

Iron release was most pronounced for soil samples collected from Walton County Central landfill reacting with the corresponding landfill leachate.

On the contrary, minimal iron release was observed for the control, i. These observations demonstrated that iron release nearby landfills in Northwest Florida was a microbial mediated iron reduction process.

Though this research is focused on Northwest Florida, the results of this research can be applied beyond local perspectives to any region with iron rich soils.

In this research, transport of Echerichia coli, Pseudomonas fluorescens and Bacillus subtilis in silica sand under water unsaturated conditions was investigated using column experiments and a two-region solute transport model was used to simulate the bacterial transport with an assumption that bacterial deposition occurred within the immobile region only.

It was concluded from this research that Show more Microbial transport plays an essential role in microbial activities in the subsurface soil.

It was concluded from this research that bacterial retention in unsaturated porous media was determined by their interactions within the system, which could be predicted based on independently determined surface properties.

Following this research, I further investigated the activities of Shewanella putrefaciens in reducing iron oxide in the iron rich soil of Northwest Florida with landfill leachate serving as the carbon source.

In addition, adsorption of reduced ferrous iron on S. Considering that organic compounds can be potentially served as energy source, I explored the feasibility of the usage of microbial fuel cell MFC technology for landfill leachate decomposition and power generation.

Landfill leachate collected from landfills located in Northwest Florida was tested in a laboratory scale MFC to provide evidence that landfill leachate can be decomposed and electrons released from leachate decomposition in the anodic chamber can be transported and consumed in the cathodic chamber and consequently, electricity can be generated.

Finally, I studied the interactions of bacteria with the porous media to explain microbial biofouling. Creator Thomas, Dornelle S.

One of the main odor compound contributors is hydrogen sulfide H2S. Presently, H2S removal from wastewater facilities is mainly being accomplished by biological means relying heavily on the use of microorganisms.

However, the use of microorganisms requires a more consistent and stable environment. In the absence of the previously stated conditions, the Show more Wastewater collection systems and treatment facilities are known for emitting offensive odors that cause neighboring residents to complain.

In the absence of the previously stated conditions, the removal of H2S has to be carried out by other means. The chemicals were supplied to the systems throughout four distinct testing phases using peristaltic pumps.

This study found that of the three chemicals chosen, H2O2 is most effective and efficient at removing H2S from wastewater collection and treatment facilities.

However, throughout this study, H2S g removal efficiencies were affected by the physical conditions at the testing facilities. Therefore, after taking the corrective action needed to improve facility conditions, further investigation is required to appropriately evaluate the use of H2O2 at odor mitigation.

Reclaimed wastewater thus has the potential to be used for agricultural irrigation. During the practice of reclaimed wastewater reuse, special care must be taken to monitor the fate and transport of the infectious agents or pathogenic organisms existing in the reclaimed wastewater since they may pass through the vadose zone and contaminate the groundwater Show more Increasing water demands owing to the growth of urbanized populations have led to constraints on existing surface and groundwater supplies.

During the practice of reclaimed wastewater reuse, special care must be taken to monitor the fate and transport of the infectious agents or pathogenic organisms existing in the reclaimed wastewater since they may pass through the vadose zone and contaminate the groundwater.

It is hypothesized lipopolysaccharide extraction would enhance bacterial interactions with the porous media, resulting maximum retention of the strains in the soil.

Thus reclaimed wastewater can be recommended to go through relevant treatment process to remove bacterial lipopolysaccharide before it is practiced for agricultural irrigation.

Lab cultured gram-negative bacterial strains, Escherichia coli, Pseudomonas aeruginosa and Pseudomonas fluorescens were used in the research.

Lipopolysaccharide of these strains was extracted and column experiments were then conducted for both treated and untreated bacterial strains with silica sand serving as the porous media.

Transport of these strains was described by the equilibrium-kinetic two-region solute transport model by fitting the experimentally obtained bacterial breakthrough data using CXTFIT 2.

Bacteria were retained in the media during transport for all the three strains with or without lipopolysaccharide extraction.

Observations after lipopolysaccharide extraction showed greater retention for all the strains as compared to the original strains, indicating enhanced bacterial interaction within the media.

Electrostatic interations between bacterial strains and porous media were calculated based on the measured zeta potential values of the strains and the media.

It was found that bacterial deposition coefficient linearly decreased with the increase of the electrostatic interactions.

After lipopolysaccharide extraction, bacterial electrostatic interactions with the porous media. Creator Patil, Sandip R.

The dominating forces are the electrostatic interactions that are determined by colloid surface charge density. Although it is well accepted that electrostatic interactions between colloids and the surrounding environment play a very important role in controlling colloid retention in porous media, it is not clear how pH and ionic strength impact the electrostatic forces and the subsequent colloid Show more Colloid transport is believed to be controlled by their interactions with the porous media.

Although it is well accepted that electrostatic interactions between colloids and the surrounding environment play a very important role in controlling colloid retention in porous media, it is not clear how pH and ionic strength impact the electrostatic forces and the subsequent colloid transport.

To have a better understanding of the impact, column colloid transport experiments were conducted under variable pH and ionic strength conditions.

Based on the column experiments, colloid deposition and transport were quantified using the advection-dispersion equation and linked to solution pH and ionic strength.

Finally, the repulsive electrostatic interactions between the colloids and the sediments were evaluated for different pH and ionic strength conditions, which were related to colloid transport observations.

Results of this research are of importance to advancing the understanding of colloid facilitated heavy metal and organic contaminant transport in the subsurface.

Using one such equation, Brown and Flagg , the predicted separation between the saturated soil and the groundwater of benzene, toluene, ethylbenzene and xylenes were compared to the actual laboratory samples from 18 petroleum contaminated sites across Florida.

In this study, 50 underground soil and groundwater samples were used to see if Show more Various empirical equations have been offered to facilitate the prediction of the concentration of pollutants in different phases in the environment.

In this study, 50 underground soil and groundwater samples were used to see if the actual soil data could reliably predict the associated groundwater concentration; if the equation is appropriate to use to predict the groundwater concentration of the sum of the four volatile organic aromatics benzene, toluene, ethylbenzene and xylenes or BTEX ; how five variable involved in the sample collection affected the results: sample type; lithology; horizontal distance between the soil and groundwater sample; vertical distance between the soil and groundwater sample; and magnitude of the soil concentration; and how the calculated foc compared to the default foc used in the development of FDEP's CTLs.

The soil concentration had a positive correlation with the groundwater concentration and a positive correlation with the Equation. While at first it appeared that the samples collected via direct push technology had a better correlation than those collected via monitoring wells, after further analysis, the groundwater samples collected via monitoring wells and with a vertical distance between the soil sample and the top of the water table of between feet, had the best overall correlation.

The poorly graded sands, with little to no fines, SP had good correlations for ethyl benzene and xylenes concentrations, but not for benzene and toluene concentrations.

As could be reasonably expected, the horizontal distance of less than or equal to five feet between the soil and groundwater sample had a good correlation with the same location being the best , and greater than 5 feet away was a poor correlation.

The vertical distance of one to two feet had the best correlation with the same location not as good, and greater than two feet worse.

The soil concentration magnitude range results were not great for any individual constituents but the correlation for BTEX was pretty good from 0.

What was interesting was how the individual constituent's concentrations varied over the soil concentration magnitude ranges.

For soils other than poorly graded sands, the fractional organic carbon should be measured during the site assessments to calculate site-specific CTLs to reduce unnecessary remedial efforts.

Trying to use the Brown and Flagg empirical equation to predict the groundwater concentration from the soil concentration at petroleum contaminated sites in Florida, may lead to erroneous data without analyzing the soil for fractional organic carbon.

Better data correlation may be obtained if the corresponding organic content of the soil is analyzed along with the soil contaminant concentration.

Further research into this subject could be refined by the following methods: 1 ensure the soil and groundwater data are collected from the same location but at various depths within 0 to 3 ft ; 2 analyze the soil for carbon content instead of assuming a carbon content; 3 obtain a better distribution of lithological and soil concentration magnitude samples; 4 collect groundwater samples at the same location via dpt and MWs; and 5 test aging, lithology and surface covering through a controlled field experiment with multiple cells.

Both oxidation systems were proven efficient in increasing the overall biodegradability of the leachate.

At an ozone dose of 7. Furthermore, this study investigated the efficiency of using the mentioned oxidation processes for overall enhancement of landfill leachate water quality and the degradation of endocrine disrupting compounds EDCs present in the leachate.

The research proved the studied oxidants were able to decrease overall total organic carbon TOC concentrations and were responsible for the removal of a fraction of the total ammonia concentration from the studied landfill leachate.

Furthermore, the research showed that ozone and the peroxone process had the ability to degrade EDCs that were present in leachate. Second order rate constants for the degradation of EDCs both in water and in leachate were also calculated in this study.

The leachate treated in the experiments was categorized as having high ammonia, high TOC concentration, low biodegradability and low UV transmittance.

The impact of ammonia, carbonates and other oxidant scavengers on the overall efficiency of the oxidants was also investigated in this study.

The stoichiometric ratio of 1. Show more Advanced oxidation processes AOPs have garnered recent consideration as an option to reduce organic loading, and the recalcitrance of mature landfill leachate.

In addition, overall anaerobic activity was not impacted by the applied ozone pre-treatments, as measured by methane formation, total gas formation, and COD removal.

Increases in population have recently started to jeopardize some of Florida's prized areas, including the Ochlocknee-St Marks Basins. Development and agriculture has started to affect watersheds and waterbodies.

This study has evaluated the water quality of coastal marshes at Show more Florida provides some of the most diverse and beautiful environments in the United States, with northwest Florida being a nearly undisturbed bounty of lush lands, springs, and other geological and ecological features.

This study has evaluated the water quality of coastal marshes at the St. Marks national Wildlife Refuge in terms of coliform and chlorophyll a.

With these constituents, dissolved oxygen DO , temperature, pH, conductivity, and total suspended solids were evaluated.

The study took place with data from January to June The study site of this research, St. To analyze for coliform, ml samples were filtered on cellulose nitrate membranes and subsequently incubated.

After 24hrs the fecal coli forms were counted and recorded. Measuring the chlorophyll a was done taking a volume of water from a particular depth and filtering it through a fine glass fiber filter to collect all of the particulate material great than 1 micron.

Effective diffusion was then measured in the lab using a diffusion coefficient in distilled water. This process was also observed using a Hamamatsu high sensitivity monochrome digital camera in a dark room, with the sample being placed in a petri dish with native soil.

Chlorophyll a adsorption was measured by introducing the sample to a column filled with goethite-coated silica sand.

Transport parameters were obtained by fitting the experimentally obtained Chlorophyll a breakthrough data using an implicit, finite-difference scheme.

All the parameters were optimized by minimizing the sum of squared differences between observed and fitted concentrations using the nonlinear least-square method.

Some key observations over the sample period include the dropping of DO as the summer months began indicating increased microbial activity with temperature.

TKN and Chlorophyll were observed to increase as temperature increased. When observing Chlorophyll as a function of TKN, the Pearson Correlation and the plot indicate that with increased TKN more microbiological activity occurs - such as with plants, algae, etc.

Interestingly when Chlorophyll was plotted as a function of DO, the low DO encourages microbial growth, however only to an extent.

The point can be made that less polluted water has less microbial activity. The correlation between coliform and turbidity showed an increase of coliform with NTU.

Chlorophyll as a function of turbidity showed no correlation. When conductivity was plotted against pH, the variability of conductivity and pH was not significantly different.

Chlorophyll a also had a correlation with pH. With the increase of pH, chlorophyll a exponentially decreased. This research shows the increased ability to forecast and assess risk presented by development and agriculture of coastal environment based on physical and chemical variations in coastal wetland ecosystems.

Utilities privatization UP is a method to leverage engineering and monetary resources to operate utility systems in a more technical and cost Show more Due to shrinking federal, state, and local utility budgets, city management structures requiring more cost effect utility operating models, and ever more stringent environmental regulations requiring technical expertise, engineers are now faced with adapting to, evaluating, and providing technical support for various forms of utilities privatization.

Utilities privatization UP is a method to leverage engineering and monetary resources to operate utility systems in a more technical and cost effective manner.

Much has been written to date about UP from a business, economic, and even political perspective. However, little literature and guidance exist from an engineering point of view.

Engineers are not taught how to participate in UP scenarios through their classical training nor even through their professional engineering associations.

In fact, at first glance, some think privatizing utility systems is merely a financial and contractual function with only secondary input and support from the engineering community.

This perception is dangerous to the communities being served by these utility systems. It must be understood that the economics and contractual considerations of any UP analysis should be driven by the engineering requirements.

If the engineering requirements are ill-defined or absent, any UP action could result in significant health and safety concerns, operational deficiencies, staggering unexpected additional costs, potential loss of water rights, etc.

Thus, it is important for the engineering community to understand their roles and responsibilities when faced with and participating in the various forms of UP.

This project was undertaken to examine engineering considerations for privatizing water and wastewater systems to which there has been little to no technical literature and guidance provided.

Furthermore, the purpose of this project is to advance the idea that the engineering community has a significant role in the UP process and to provide background and technical guidance so engineers can participate to the best interest of the communities being served.

Guidance will be provided so the engineering community understands the various forms of UP, the engineer's role, and how to participate in the different phases of a UP analysis.

Case studies will be evaluated to elaborate on the critical engineering aspects involved and the overall success or failure of the UP action.

The environmental considerations associated with UP will also be researched with guidance to the engineering community provided. These include impacts to the RCRA mixed sewage exemption, potential impacts to water and reuse rights, and the environmental liabilities associated with UP.

Furthermore, guidance will be provided so engineers understand their role in UP economic analyses and how to support the technical aspects of UP to ensure industry operating standards such as American Water Works Association AWWA are met.

Creator Pipkin, Leslie M. The endocrine disrupting compounds bisphenol A BPA and 17b-estradiol E2 are chemical compounds that have an adverse effect on the environment, humans, and wildlife.

These two chemical constituents are being examined in this research because they are still being used today and continue to impact their surrounding environment.

These chemicals are considered persistent, Show more The research is focused on the degradation of two endocrine disrupting compounds EDCs in zero-valent iron.

These chemicals are considered persistent, bioaccumulative, and toxic to the environment. The research explores the technological use of zero-valent iron to degrade the chemical constituents in aqueous form.

The study conducted laboratory batch experiments to compare the efficiency of using zero-valent iron in a reducing environment to remediate endocrine disrupting compounds in groundwater.

The experimentations looked at varying ratios of volume of solution to mass of zero-valent iron. Furthermore, this study compared the reactions of the chemical constituent in question by varying the aqueous solution to entail the combined constituents BPA and E2 to separate solutions to determine the chemical degradation model and rates over a period of a week.

Degradation rates increased as the varying volume to mass ratio decreased. The higher degradation rates were found with a volume to mass solution at which gave the chemicals the shortest half-lives.

BPA's lowest calculated half-life was approximately 12 days. E2's lowest calculated half-life was approximately 1 day. The degradation rates varied for each EDC when the compounds were treated separately in an aqueous solution over a hour period.

The set of experimentations showed that the higher degradation rates occurred with a volume to mass ratio of The research shows that the chemicals are competing for the surface area of the iron when in combined solutions.

The experimentations in separate solutions show that E2 is a limiting factor in the ZVI. The research determined that degradation of bisphenol A and 17b-estradiol will occur in an aqueous solution in zero-valent iron.

Creator Harmon, Virginia P. Examples include application of septic tank effluent to soil for subsurface infiltration, slow-rate SR wastewater irrigation, overland flow wastewater application, and soil aquifer treatment SAT , also called rapid infiltration RI.

These processes can remove nitrogen, which usually is the limiting design parameter for a land application system. Wastewater or septic tank effluent Show more Land application is one of the natural treatment processes for raw or partially treated domestic wastewater.

Wastewater or septic tank effluent applied to the land in this study contains organic nitrogen and ammonia, plus nitrate and nitrite in the wastewater.

The total depth of each soil profile was cm with one soil type Kershaw Sand in each profile. The slow-rate simulation profiles consisted only of soil; the septic simulation profiles contained a total of cm of soil with a 30 cm space containing drainrock no effect on simulation around the effluent distribution pipe.

It was assumed that all applied nitrogen was converted to nitrate within the same time period assumed for application, and that there was no adsorption of nitrate.

Water balance outputs included cumulative transpiration, hydraulic flux across the bottom of the soil profile, evaporation, infiltration, and runoff per square centimeter of soil.

Nitrogen balance outputs included cumulative amount of nitrate removed by denitrification, root nitrate uptake, and nitrogen flux across the bottom of the soil profile.

In the slow-rate simulations 4. In the septic simulation, The objective of this study was to compare the nutrient loading from two hypothetical nitrogen contributors to the environment analogous to, and with only a general resemblance to, 1 the City of Tallahassee Southeast Farm SEF , which practices SR wastewater irrigation and 2 conventional septic systems.

The modeling conditions for each contributor were set to be as similar as possible to those for the other contributor. Flux results from the above simulations per square centimeter of soil during the second year of the simulation were multiplied by appropriate factors to yield the total mass of nitrogen applied to the surfaces of and the total mass of nitrate exiting the bottoms of the cm soil profiles for sources 1 and 2 during one year.

The estimated total mass of nitrogen applied to the simulated Southeast Farm was 3. The estimated total mass of nitrogen in the effluent from 28, septic tanks from conventional septic systems added to drainfields in the unconfined areas of Leon and Wakulla counties and in the semi-confined area of Leon County was 3.

The total mass of nitrogen as nitrate exiting the bottom of the soil profile of the simulated SEF 2, acres was estimated to be 1.

The total mass of nitrogen as nitrate exiting the bottoms of the soil profiles for the estimated 28, conventional septic systems in the geographical areas listed in the previous paragraph was estimated to be 1.

Additional simulations of slow-rate wastewater irrigation were conducted to meet the objective of modeling the nitrogen removal while varying the wastewater loading rate and the denitrification rate constant K.

The inputs were chosen so that the nitrate concentration ranged from 0 to 1. When K was 0. The corresponding wastewater loading values for K of 0.

The nitrate concentrations at bottom of soil profile corresponding to the current wastewater loading rate of 0. The results of this study may be usable to compare the yearly amounts of nitrogen loading for the above facilities.

However, the overall accuracy of the results in describing the real SEF or a real conventional septic system is low mainly because of the method of modeling denitrification, the simplified method of determining input values, and perhaps the complexity of the processes modeled.

Future modeling could be conducted so as to improve upon the above limitations. Also, the simulation s could be set up to take into account the effect, if any, of the water table elevation on flow.

Further studies are needed to better understand and predict denitrification, and other types of denitrification models are available.

At real sites, soils with improved water-holding properties could be added via soil mixing, thus improving wastewater treatment performance.

It also produces many disinfection by-products DBPs that are considered carcinogenic. This study seeks to evaluate a solution for the removal of DBPs, namely bubble column aeration in conjunction with granulated activated carbon GAC filtration.

Trihalomethanes THMs , which are one of the two major Landauer, Inc. Zorko will replace Michael K. Burke , who has left the company to pursue other interests.

Prior to that time, Mr. From to , Mr. His prior experience also includes serving as the corporate controller for Zenith Data Systems Corporation and finance manager positions with Honeywell, Inc.

Flock is an year veteran with adidas Group AG, where he has held numerous executive level positions for the company throughout Europe, Asia and North America.

Collins previously held a number of financial leadership positions at The Walt Disney Company and co-founded a technology-focused venture capital firm.

Spotlight Innovation, Inc. Hostelley has spent twenty years as a consultant in the health field. During his more than twenty years in business he has served as CEO, CFO and board member of several publicly traded companies.

Sibling Group Holdings, Inc. Nutroganics, Inc. Scott is a business executive with a 22 year career of financial management and C-level leadership across a range of industries.

Most recently, Mr. Scott was the senior financial executive at a Middle East based government services organization with a roll-up strategy led by many former Veridian Systems executives.

Novatel Wireless, Inc. In , Mr. Throughout his career, Mr. He has also served as board director for public and private companies.

LeMahieu will join the organization in August Epic Health Services, Inc. Operations for United Surgical Partners. Prior to his appointment as CFO, Mr.

Vogensen held multiple positions of increasing scope and responsibility with Michaels Stores, Inc. Before joining Michaels, Mr.

Energy Recovery Inc. Joel joined Energy Recovery in January and has held several positions at the company, including most recently serving as Vice President of Finance since June Bob Evans Farms, Inc.

Loyalty Corporation, in various financial and administrative senior management roles. Cytec Industries Inc. Prior to this position, Mr. Since May , Mr.

Prior to Mirion, Mr. Glassdoor , announced the appointment of Adam C. Spiegel as chief financial officer. Spiegel also previously served as CFO for two early-stage life science companies.

Earlier in his career, he was an investment banker. Vera Bradley, Inc. In the ten years prior to joining the Company, Sierks worked in the medical device industry in finance and accounting positions of increasing responsibility, including Vice President and Corporate Controller of Biomet and Director of Accounting and U.

Shared Services at Boston Scientific Corporation. He has also held a senior finance position at truckloadsusa. Kindred Healthcare, Inc. Farber succeeds Richard A.

Lechleiter , whose previously announced retirement from the Company was effective January 15, Farber has more than 20 years of healthcare experience, including serving as Chief Financial Officer for Tenet Healthcare Corp.

Most recently Mr. Farber led the successful financial restructuring of Rural Metro, and has been involved in various private equity efforts, including as a healthcare executive-in-residence with Warburg Pincus.

Farber began his career as an investment banker with J. Drillock , Vice President and Chief Financial Officer, has announced his intention to retire from Cytec effective December 31, , completing a 36 year career with Cytec and its predecessor.

Broadridge Financial Solutions, Inc. Sheldon will remain with the Company in an advisory role through April 11, to assist with the transition.

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