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  • Nutrient Removal News Documents on Water Online
    new rules around phosphorus discharge imposed by the state Algal Bloom May Be Linked To Alzheimer s Researchers Say 2 10 2016 Researchers say algae found in freshwater lakes and reservoirs may be linked to illnesses including Alzheimer s Disease and Motor Neurone Disease MND BCR Environmental Corporation President And CEO Aaron Zahn Receives Governor s Business Ambassador Award From Florida Governor Rick Scott 2 9 2016 BCR Environmental Corporation BCR a proven innovator of technologies for the advanced treatment and conversion of wastewater and organic waste recently announced that President and CEO Aaron Zahn was awarded the Governor s Business Ambassador Award by Florida Governor Rick Scott at Connect Florida s Day the Capital 2016 event sponsored by Connect Florida Researchers Turn To Algae For Wastewater Treatment 1 25 2016 Researchers say using algae to treat wastewater is more effective than processes currently used in many municipal facilities Study Reveals Climate Change Impacts On Buzzards Bay 1 25 2016 An analysis of long term water quality monitoring data reveals that climate change is already having an impact on ecosystems in the coastal waters of Buzzards Bay Mass Des Moines Pours 1 5 Million Into Nitrate Removal 1 20 2016 Des Moines Water Works paid a hefty tab for denitrification last year Virginia Tech Invents Energy Generating Ammonia Removal Technology 1 13 2016 Researchers at Virginia Tech have developed a bacterial battery that may offer both energy generation and ammonia removal and recovery to wastewater treatment facilities NuTerra Installing CleanB System At Vero Beach Wastewater Treatment Plant 1 13 2016 NuTerra a designer builder and provider of services based on proprietary financial and risk analysis models that help municipalities address capital and operating changes recently announced that it has begun installing a new CleanB system at the wastewater treatment plant

    Original URL path: http://www.wateronline.com/hub/bucket/nutrient-removal-news (2016-02-14)
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  • Smell Test A Comparison And Ranking Of Hydrogen Sulfide Emission Factors
    including wastewater facilities are very useful Per the EPA an air quality emission factor is the relationship between the amount of pollution released and the amount of raw material processed or amount number of product units produced or amount of work done Examples of emission factors include mass of CO 2 emitted per distance driven by a vehicle kg CO 2 km driven mass of SO 2 produced per unit amount of electricity produced kg SO 2 KWHelectricity produced and others Determining EF is considered an important step in assessing air pollution and subsequent control Since 1972 the EPA has published AP 42 Compilation of Air Emission Factors AP 42 which is a collection of EFs and process information for more than 200 air pollution source categories from a wide range of industry sectors Technology Transfer Network Clearinghouse for Inventories and Emission Factors EPA In this study the pollutant of concern is H 2 S from various WWTP headworks and the parameters to describe the unit of measure for normalization are 1 flow of wastewater processed by the WWTP 2 population served by a particular WWTP and 3 service area associated with the WWTP EF is an average value obtained from a long term observations study performed during normal operations of the polluting unit AP 42 indicates that EF formulae which include variable parameters such as temperature wind velocity and pollutant unit dimensions produce a more realistic estimate In line with the EF guidelines established by AP 42 this study based its EF calculation methodology on variables such as H 2 S emissions using continuous H 2 S concentrations within the headworks influent chamber sampling every 5 minutes for six months wastewater flow received at the WWTP service area and population served This research attempted to determine H 2 S EFs for headworks at four WWTPs based on field measurements of H 2 S emissions and other parameters These EFs are expressed as a function of a wastewater flow EF Flow b population EF Population and c area served EF Area Four Jefferson Parish WWTP headworks East Bank shown in Figure 2 Marrero Harvey and Bridge City were chosen as the sites for this evaluation study pilot project as all flows pass through these units and it also has one of the highest potentials to generate H 2 S Based on the findings of this evaluation study researchers could modify their methodology for any future research in this area Figure 2 East Bank WWTP headworks and air sampling location on top of the headworks unit Results Comparison Of EF Ranges Among Various WWTP Headworks Figures 3 to 5 at right show the comparison of EF Flow EF Population and EF Area among all four WWTPs in terms of maximum minimum and average EF values It was observed that the weekly average EF Flows calculated for Marrero and Bridge City WWTPs are 5 percent apart whereas the average EF Flows for Harvey and East Bank WWTP are 3 percent apart Similarly

    Original URL path: http://www.wateronline.com/doc/smell-test-a-comparison-and-ranking-of-hydrogen-sulfide-emission-factors-0001 (2016-02-14)
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  • How To Avoid Sewer Stench And Corrosion
    also greatly increased However there are ways to interrupt the sulfide cycle reduce dissolved sulfide concentration avoid H2S gas release and prevent corrosion as discussed below Reduce slime layers by removing debris Control dissolved sulfide through chemical addition Reduce H2S gas release through turbulence reduction Protect sensitive surfaces from the effect of acid generation The first solution is pretty easy to figure out Clean sewers of settled debris to reduce the area of slime layer and minimize dissolved sulfide generation Next consider chemical addition to control the dissolved sulfide that is generated Iron chemicals nitrate hydrogen peroxide and caustic in the form of sodium hydroxide and magnesium hydroxide are all common choices that can effectively control dissolved sulfide concentrations according to Joyce He notes that the advantages of chemical addition facilities are quick installation and low capital cost but also cautions that chemicals can have high long term costs are most often hazardous to handle and dangerous to transport and can be maintenance intensive Iron nitrate and peroxide react stochiometrically with dissolved sulfide meaning that higher levels of dissolved sulfide require higher doses of chemical to prevent the release of H2S gas Magnesium hydroxide is not stoichiometric it can be effective at a single addition rate regardless of the dissolved sulfide concentration but it can have a higher cost than the other chemical alternatives at lower sulfide concentrations Ironically improvements in environmental regulations have caused an increase in the wastewater related odor and corrosion issues commonly experienced today The Clean Water Act Title III reduced the amount of heavy metals in collection systems by requiring industrial pretreatment Those metals including chromium copper mercury cadmium nickel and many others were passing through treatment plants bio accumulating in receiving waters and causing damage to flora and fauna It was discovered that these dangerous metals had been inhibiting the growth of sulfate reducing bacteria in the slime layer making them produce less dissolved sulfide Once these heavy metals were removed the slime layer became very active resulting in a general increase in dissolved sulfide in the sewers in the U S Furthermore decreased infiltration and inflow I I and the separation of combined sewers as well as water conservation practices have increased biochemical oxygen demand BOD which is the main food source for the slime layer The combination of these factors has increased dissolved sulfide production in sewers and caused utilities to spend much more on sulfide controls chemicals odor scrubbers and repair of corrosion damage Worst Case Scenario With high dissolved sulfide comes excessive odor and corrosion problems and we have seen the conditions under which sulfide generation thrives The conditions that lead to excessively high sulfide production are listed below and although some are more controllable than others Joyce warns that having two or more of these conditions present in your sewer system could lead to significant problems and costly solutions Warm annual sewage temperatures Average 70 degrees F Long force mains and or flat sewers with debris High BOD wastewater

    Original URL path: http://www.wateronline.com/doc/how-to-avoid-sewer-stench-and-corrosion-0001 (2016-02-14)
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  • Bio-Dredging: Cost-Saving Sludge Digestion For Lagoons
    concerns about what s contained in the biosolids sludge Excessive build up of sludge can potentially intensify odors and increase effluent concentrations of BOD TSS nutrients like ammonia and pathogens The City of Royston Georgia Background The first pond in the Royston treatment system was a well mixed aerated system the second pond has three cells the first cell was a sludge accumulation cell the second cell was utilized for stabilization followed by chlorination and discharge third cell All permit requirements were routinely met Sludge was dredged from the second pond cell once every 3 to 5 years at a cost of 150 000 00 per event A previous dredging event damaged the liner costing 125 000 00 to repair cost is for the repair damaged area only The Science behind Blue Frog Technology to Bio dredge In Situ Absolute Aeration has discovered methods to apply established biochemical science that translates into reliable operating processes for wastewater treatment moving beyond pilot studies to extensive field testing and scaling up to practical systems The Blue Frog System BFS mimics natural bodies of water keeping the water in three distinct layers employing a three step process Step One Select for Indigenous sludge digesting bacteria Shear helps Nature form a dense spherical biofilm biogranule that turns solids into gas at the base of the water column Step Two The surface is aerated to convert soluble BOD into insoluble BOD Fresh biosolids sink to the bottom dwelling biogranules for conversion to gas Step Three Clean thin surface water is redirected to the bottom of the water column to reject floating solids like blue green algae Sinking solids are digested in situ at the bottom of the clarifier process Clarified water is aerated chlorinated and discharged Documented Results in Royston The City of Royston s 6 month average results ending in June 2014 Pollutant Results mg l Monthly Permit Requirements mg l BOD 20 30 TSS 20 90 Ammonia 8 3 17 4 Residual Sludge 1 5 4 of dense biogranules 14 of low density fluff Google earth picture prior 2011 Google earth picture after 2012 There were five significant issues uncovered and resolved during the project implementation 1 Sludge digestion bio dredging is at a controlled rate slow and steady not fast Sludge digestion is a multi step choreographed natural process with a stinky intermediate step volatile fatty acids VFA The waste from one step is the food for the next step When one step is faster than the next the system is no longer in equilibrium A corollary to this rule is If the system stinks the odor goes directly to the mayor s office The issue was resolved by changing the rotation of the Cell 1 circulators to slow the process down 2 Sludge reduction was normal in Pond 2 Cell 1 but not in Cell 2 When the liner was damaged a dam was built around the Pond 2 Cell 1 inlet and the pond was lowered to make the repair

    Original URL path: http://www.wateronline.com/doc/bio-dredging-cost-saving-sludge-digestion-for-lagoons-0001 (2016-02-14)
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  • 5 Reasons To Consider Decentralized Wastewater Treatment
    Management Consumer Outreach Funding Labor Resiliency SCADA Automation Source Water All Source Water Contamination Desalination Water Scarcity Water Reuse Regulations and Legislation Providers YSI a Xylem brand Hach Company Schneider Electric Neptune Technology Group Inc Evoqua Water Technologies Veolia Water Solutions Technologies ABB Measurement Products Aclara Jacobi Carbons Endress Hauser Inc KROHNE Inc Kaeser Compressors Inc Emerson Process Management Rosemount Analytical Degremont Technologies Brentwood Industries View All Providers From The Editor February 10 2014 5 Reasons To Consider Decentralized Wastewater Treatment By Kevin Westerling KevinOnWater The economic and environmental costs of treating all wastewater at a centralized location can be a burden At what point does decentralized treatment make more sense Decentralized wastewater treatment is certainly not new but at the same time it has yet to be embraced as a popular alternative to centralized big plant operations That soon may change according to the president of Bio Microbics Bob Rebori who admittedly has a vested interest in seeing it popularized his company specializes in decentralized solutions Rebori s optimism is not unfounded however as an objective argument can certainly be made for the benefits and even the inevitability of wider scale decentralization For his part Rebori is not calling for a revolution He spent many years as a municipal plant operator and actually prefers the term distributed over decentralized The latter he reasons suggests an us versus them dynamic when in reality the proper treatment approach is purely circumstantial dependent on location economics and objectives From my conversation with Rebori here are five reasons for a community or business to consider decentralized AKA distributed wastewater treatment Like what you are reading Sign up for our free newsletter SIGN ME UP By clicking Sign Me Up you agree to our Terms and that you have read our Privacy Policy Bio

    Original URL path: http://www.wateronline.com/doc/reasons-to-consider-decentralized-wastewater-treatment-0001 (2016-02-14)
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  • Targeted Algal Management Plan To Address Taste And Odor Problem
    All Source Water Contamination Desalination Water Scarcity Water Reuse Regulations and Legislation Providers YSI a Xylem brand Hach Company Schneider Electric Neptune Technology Group Inc Evoqua Water Technologies Veolia Water Solutions Technologies ABB Measurement Products Aclara Jacobi Carbons Endress Hauser Inc KROHNE Inc Kaeser Compressors Inc Emerson Process Management Rosemount Analytical Degremont Technologies Brentwood Industries View All Providers Case Study June 16 2015 Targeted Algal Management Plan To Address Taste And Odor Problem Source Lonza Lake John Hay is located six miles northwest of Salem Indiana and is used for drinking water and tournament and recreational fishing With an average depth of 14 15 feet it is ideal for algae and plant growth The persistent recurring algae blooms was causing taste and odor problems which led to frequent complaints Once officials sought an action plan it was discovered that two primary planktonic taste and odor producers Planktothrix and Chrysochromulina were in the water samples Geosmin concentrations in excess of the human detection threshold were also measured at several locations within the reservoir as well as in sediment samples Learn how the use of Lake John Hay was restored with the cost of water treatment for potable water declining post treatment

    Original URL path: http://www.wateronline.com/doc/targeted-algal-management-plan-to-address-taste-and-odor-problem-0001 (2016-02-14)
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  • Wastewater Treatment System Achieves Stringent Water Quality Discharge Limits And Reduces Costs
    Regulations and Legislation Providers YSI a Xylem brand Hach Company Schneider Electric Neptune Technology Group Inc Evoqua Water Technologies Veolia Water Solutions Technologies ABB Measurement Products Aclara Jacobi Carbons Endress Hauser Inc KROHNE Inc Kaeser Compressors Inc Emerson Process Management Rosemount Analytical Degremont Technologies Brentwood Industries View All Providers Case Study March 9 2015 Wastewater Treatment System Achieves Stringent Water Quality Discharge Limits And Reduces Costs Source Sanitaire A Xylem Brand The Village of Johnson Wastewater Treatment Facility WWTF was among the first in the state of Vermont to meet newly enacted secondary treatment requirements when it began operation in 1970 After legislative changes more than two decades later called for stricter discharge limits on phosphorous ammonia and residual chlorine the Village of Johnson sought to increase the facility s flow capacity especially its ability to handle the high seasonal flows associated with storm events Biological phosphorous removal accomplished during the SBR fill cycle significantly reduces the amount of chemicals necessary to meet the new phosphorous effluent limits The blower feedback control system uses dissolved oxygen probes to control the aeration blower runtime during the fill aerate cycle reducing the aeration electrical energy cost The SBR system provides a level

    Original URL path: http://www.wateronline.com/doc/wastewater-treatment-system-achieves-stringent-water-quality-discharge-limits-and-reduces-costs-0001 (2016-02-14)
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  • Mixers Prevent Buildup And Reduce Wetwell Cleaning Charges
    SCADA Automation Source Water All Source Water Contamination Desalination Water Scarcity Water Reuse Regulations and Legislation Providers YSI a Xylem brand Hach Company Schneider Electric Neptune Technology Group Inc Evoqua Water Technologies Veolia Water Solutions Technologies ABB Measurement Products Aclara Jacobi Carbons Endress Hauser Inc KROHNE Inc Kaeser Compressors Inc Emerson Process Management Rosemount Analytical Degremont Technologies Brentwood Industries View All Providers Case Study March 9 2015 Mixers Prevent Buildup And Reduce Wetwell Cleaning Charges Source Flygt A Xylem Brand The City of Reno NV has long battled the buildup of fats oils and grease in the wetwells of wastewater lift stations in the valleys within this high desert city Recently the city set out to address the problem and reduce the associated costs Instead of continuing the frequent wetwell cleanouts at 28 lift stations Ariaz and Pete Galati of the local Flygt office tested an alternative which was to install a Flygt Model 4630 mixer to prevent buildup in the wetwell of a test station which serves an area of mixed warehouse and housing customers After several months of testing Sallaberry and his lift station workforce saw a significant reduction in man hours 8 and wet well cleaning charges

    Original URL path: http://www.wateronline.com/doc/mixers-prevent-buildup-and-reduce-wetwell-cleaning-charges-0001 (2016-02-14)
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