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  • Aeration & Blowers News Documents on Water Online
    Cheshire and Lawton Gate in Staffordshire Kaeser Wins AGENT Business Of The Year Award 1 29 2016 Kaeser Compressors Inc has been awarded the 2015 AGENT Assist Grow Educate Network Thrive Award by the City of Cypress California 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 The Secret To Savings Your Utility May Be Letting It Burn Away 1 13 2016 In Fort Wayne IN the wastewater treatment plant cut its monthly energy consumption from about 1 6 million kilowatt hours to just over 1 million kilowatt hours saving the utility 42 000 Parkson Signs Exclusive Licensing Agreement With Equanox Systems LLC 1 12 2016 Parkson Corporation is pleased to announce it is expanding its biological wastewater treatment system offerings through an exclusive licensing agreement with Equanox Systems LLC Atlas Copco Launches New ZB 250 High Speed Turbo Blower 12 14 2015 The new ZB 250 high speed turbo blower provides wastewater aeration basins with high efficiency air The new machine features a two pole permanent magnet motor with rare earth element magnets Kaeser s International Headquarters In Coburg Germany Lays Cornerstone For New Admin Building 12 1 2015 Kaeser Kompressoren SE the international headquarters of Kaeser Compressors Inc recently gathered with local dignitaries and construction company representatives to lay the cornerstone of their new administrative building Kaeser Celebrates Expansion At International Headquarters In Coburg Germany 11 24 2015 Just a year after breaking ground on a major expansion project Kaeser Kompressoren SE the international headquarters of Kaeser Compressors Inc has held a topping out ceremony to celebrate adding the roof to one of the new industrial rotary screw compressor production halls Aqua

    Original URL path: http://www.wateronline.com/hub/bucket/aeration-blowers-news (2016-02-14)
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  • WWEMA Window Why Fine Screening Is Crucial At The Headworks
    a bit more forgiving than hollow fiber types While fine screening technology offers superior solids removal and protection of downstream equipment the screen is more susceptible to damage from heavy debris such as stones and irregular objects that are often carried by storm flows in combined sewer overflow CSO systems This heavy trash can damage the screening panels or overload the removal systems In CSO applications multi stage screening is typically employed with a coarse screen placed upstream of the finer capture device This approach employs a second solids removal area that will usually also require a washer compactor to clean and dewater the removed solids A viable option that eliminates this preliminary coarse removal point and provides the additional protection for the downstream fine screen is to utilize a dual shafted grinder to precondition all solids This reliable and economical solution can shred especially tough debris to a size that can easily be handled by a fine screen and also by pumps in lift stations The added benefit of a dual shafted grinder is its ability to break down those essential soft organics so they are more easily passed through the fine screen while controlling the particle size of the debris so the fine screen can still effectively remove the unwanted solids Finer screening at the headworks results in removal of greater quantities of solids than traditional bar screens sometimes twice as much The industry has developed innovative washer compactor solutions that shred clean dry and reduce screenings so they can be sent directly to landfill often at reduced classification levels and cost A key consideration of these washer compactor solutions is selection of a system that not only compacts well thus reducing volume and increasing dryness but also one that effectively separates organics prior to compaction The following case studies demonstrate use of these state of the art fine screen and washer compactor technologies in action and reflect on the cost savings reduced maintenance and downstream equipment protection associated with these capable technologies Revelstoke Treatment Lagoon Revelstoke British Columbia Canada The city of Revelstoke British Columbia experiences a population surge every winter as tourists flock to the area to enjoy the pristine scenery and excellent skiing and snowboarding venues Since its opening in 2005 the Revelstoke Mountain Resort has hosted thousands of visitors throughout the winter months which predictably causes a dramatic increase in the sewage that flows through the Revelstoke Water Resource Recovery Facility WRRF In 1998 The WRRF installed a channel grinder screen system in one of their three channels thus processing shredding only 33 percent of the debris entering the facility prior to discharge to sewage lagoon The problem was relatively minor prior to opening of the resort but post 2005 the increased level of solids influx left operators struggling to skim floating debris off the lagoon during the busy season They sought a solution that could keep the WRRF efficient and productive during these peak flow periods The decision was to install a high

    Original URL path: http://www.wateronline.com/doc/wwema-window-why-fine-screening-is-crucial-at-the-headworks-0001 (2016-02-14)
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  • Decentralized Wastewater Treatment Shines As Aquifer Recharge Solution
    a significant risk to public health as they can flood surface waters with contaminants or hazardous chemicals In addition the clean water discharged from the facility is largely carried away from its original location before it filtrates into the soil evaporates or is removed for a downstream potable water supply Discharge thus provides limited groundwater recharge of the billions of gallons of treated effluent released daily Centralized wastewater infrastructure also adds to groundwater depletion as leaking pipes can cause groundwater to infiltrate into the pipes and be carried to the centralized facility Decentralized systems on the other hand treat and filter effluent through the soil directly into the local aquifers Once filtered through the natural soil into the aquifers the clean water travels to surface waters or wells or estuaries where it can be utilized by humans and natural ecosystems In this way decentralized wastewater treatment systems provide the most passive and environmentally sound form of aquifer recharge and wastewater recycling Aquifer Recharge Using Decentralized Wastewater Treatment Aquifer recharge is a growing method of water table stabilization and water supply in the U S The U S EPA defines aquifer recharge as the enhancement of natural groundwater supplies using man made conveyances such as infiltration basins or injection wells As currently defined by the EPA aquifer recharge systems are typically used in areas with limited ground or surface water availability Figure 1 Groundwater depletion in the continental U S However when adequately designed and installed a decentralized wastewater system can process large amounts of wastewater through the underlying soils making it one of the most passive sustainable forms of aquifer recharge Rather than partially to fully treating wastewater effluent then discharging it to a surface pond or injection well before recharging the aquifer decentralized systems provide both wastewater treatment and groundwater recharge in one step Figures 1 and 2 show the groundwater deficits in the United States and the decentralized utilization rates for each state respectively In general areas in dark red on the groundwater storage map correlate with areas of light decentralized utilization as well as the opposite a general correlation can therefore be made between low septic utilization rates and groundwater depletion While other factors greatly impact groundwater depletion e g precipitation urbanization and agricultural practices the figures can be interpreted to show that decentralized wastewater treatment has an impact on groundwater storage Applicability Of Decentralized Wastewater Treatment As technology continues to advance an increasing number of sites have become viable candidates for decentralized systems For example designing a small scale advanced treatment train prior to dispersal of the effluent into the native soil can decrease both the absorption area and depth to limiting layers that are required for adequate treatment This has allowed decentralized systems to be placed in areas previously inaccessible in turn increasing the volume of groundwater recharge associated with decentralized systems While traditionally thought of as a low flow wastewater treatment solution decentralized systems can be designed to treat any volume of wastewater Community

    Original URL path: http://www.wateronline.com/doc/decentralized-wastewater-treatment-shines-as-aquifer-recharge-solution-0001 (2016-02-14)
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  • 'Project Clean Lake' Breaks New Ground In Pollution Control
    Lake Erie and the Cuyahoga River After the rain stops massive hydraulic pumps convey the flow back to the surface and to one of the district s three wastewater treatment facilities In April 2011 the sewer district broke ground on its Euclid Creek Tunnel project which includes an 18 000 foot long 24 foot wide storage tunnel 200 feet underground Just over two years later in August 2013 Mackenzie the district s 1 500 ton tunnel boring machine completed its three milelong excavation The finished tunnel will have the capacity to capture about 65 million gallons of combined wastewater and stormwater and will directly impact water quality in Lake Erie and local streams Project Clean Lake also includes a minimum of 42 million in green infrastructure projects which the federal government had never before included in its CSO control consent decrees These stormwater control measures which include such technologies as bioswales and detention basins can store infiltrate and evapotranspirate rainfall before it even makes its way into the combined sewer system In the last five years the sewer district has committed more than 31 million to green infrastructure projects Plant Power Enhancements to the sewer district s three wastewater treatment plants which together treat over 90 billion gallons each year are crucial components of Project Clean Lake At the district s Easterly and Southerly treatment plants the amount of wastewater that can receive treatment will increase This is necessary to accommodate the greater volumes of combined flow that will no longer be allowed to discharge straight into the environment In particular the Easterly plant is undergoing major construction through 2016 to expand its secondary treatment capacity including the installation of six additional final settling tanks Despite the ongoing construction Easterly was recognized in 2014 with the highest performance honor from the National Association of Clean Water Agencies the Platinum Peak Performance Award for five consecutive years of meeting National Pollutant Discharge Elimination System NPDES permits The Westerly and Southerly plants also received Gold Awards for continued excellence in meeting their NPDES permits In addition all three district plants are implementing advanced methods for dealing with wetweather flows from overwhelming rain events Even with the new storage tunnels you still can have overflow explained Douglas Dietzel a process specialist at the Westerly plant So as part of our agreement with the EPA we re increasing our ability to treat wastewater during highflow events The Westerly plant which sits on the shore of Lake Erie is Cleveland s oldest wastewater treatment site constructed in 1922 and serves approximately 103 000 residents The plant processes an average flow of 26 million gallons per day MGD of wastewater and its Combined Sewer Overflow Treatment Facility CSOTF provides storage for six million gallons and preliminary treatment for up to 300 MGD during wet weather flows In the CSOTF the heavier organic material is allowed to settle out of the wastewater but the flow can still contain pathogens when it is returned to Lake Erie since

    Original URL path: http://www.wateronline.com/doc/project-clean-lake-breaks-new-ground-in-pollution-control-0001 (2016-02-14)
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  • The Do’s And Don’ts Of MBR Pretreatment
    engineering specialist for Ovivo fine screens with apertures of 2 mm to 3 mm are the bare minimum for protecting membranes but will only remove two dimensional solids Ultra fine screening 0 01 mm to 1 mm can better approach three dimensional solids removal and protect the membranes from hair fiber and filamentous algae and larvae He also noted however that MBR facilities with screens 2 mm or finer and flows of at least 2 MGD must also add larger aperture screens and grit removal upstream Otherwise the fine screens will blind quickly bypass solids through holes and seals and experience excessive wear Membranes are a very expensive investment said Impero speaking at the 2015 Membrane Technology Conference Exposition and their only protection is a series of protective coarse and fine screens and grit removal systems While Impero recommended the Ovivo Duet system a two in one unit that combines a course screen 3 mm or 5 mm with very fine 0 3 mm to 1 8 mm mesh screening he noted other MBR pre screening options including Spiral screw gravity flow stationary screens Gravity flow rotary drum screens Internally fed pumped flow drum screens Center flow and dual flow band screens Single and double entry gravity flow screens The Ovivo Duet dual aperture screen Do s And Don ts Whatever your choice of screening Impero provided the following rules of thumb Always install membrane screens post coarse screening to reduce blinding Always install membrane screens post grit systems Never put a grinder comminuter or cutter shredding device anywhere upfront of membrane screens and membranes According to Impero they will create small sharp plastic projectiles fibers and rope that will cause serious problems at the membranes Never exceed peak flow velocity of 1 5 second at screen panels for 3 mm and 2 mm membrane screens and 1 2 second or less for 1 mm screening and smaller with proper upfront coarse screening Perform sieve tests once per month How To Perform A Sieve Test Impero and Ovivo worked with GE Water Process Technologies to come up with the simplest process to test screening efficiency Assemble a stack of sieves of the following sizes largest sieve on top 2 00 mm ASTM No 10 1 00 mm ASTM No 18 Collect from a sample port and carefully pour a known volume 60 to 200 L of representative mixed liquor through the sieves The correct volume of mixed liquor to use for the test will depend on how much material is collected on the sieves The key is to use a sample volume that is large enough to ensure that enough material is collected to be easily weighed For a very clean or very thin low mixed liquor suspended solids MLSS sample this may mean a sample volume of 200 L 50 gal or more For a very dirty or very thick high MLSS sample this may mean a sample volume of 60 L 15 gal or less Pour clean water

    Original URL path: http://www.wateronline.com/doc/the-do-s-and-don-ts-of-mbr-pretreatment-0001 (2016-02-14)
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  • Tackling “Flushable” Wipes The Intelligent Way
    This may be through adding cutter pumps or screens or by changing impeller types These methods can come with high capital expenditure or operational costs but can be a great fix if a full rag ball hits the cutters and is chopped perfectly However as the blades dull over time the wipes may get caught between cutting surfaces like trying to cut a wet wipe with a blunt pair of scissors The chopping effect can also shred the wipes so small that they pass through the inlet screens at the treatment works and affect the treatment process Get Smart There are new intelligent ways to tackle the wipes issue without having to change pump type These may be in the form of new variable frequency drives VFDs or smaller purpose built intelligent controllers VFDs tend to perform pump reversals on a time basis while intelligent controllers do it when the blockage reaches a certain level The latter is much more successful however the key to using this type of technology is not only in the reversal but also in the detection method everyone knows reversing a tripped or fully blocked pump can sometimes dislodge the rag ball Detecting the blockage early enough will always dislodge it With that in mind perhaps it s best to first look at and understand how blockages form in wastewater pumps Running ragged Clogged pumps are an expensive nuisance Pre empt The Problem It is important to note that typically the wet wipes do not enter the well as rag balls instead they arrive somewhat separatly in small numbers Over time the wipes catch on the impeller blades This can happen from a small buildup of fats oils and grease FOG or simply from chips on the impeller itself Once one wipe is caught more will gradually knit together and form the typical rag ball that causes the motor thermal overload to trip It is the rag ball itself that trips blocks the pumps or in some cases when the pump stops the rag ball may detach itself due to gravity and fall back into the well This results in multiple balls of wipes looking similar to mop heads floating in the well These mop heads can then plug the inlet of the pumps As the wipes begin to build up a few things happen First the pump s flow rate can drop by as much as 30 percent This increases pump speeds constant flow level and cycle time fill and draw and may cause assist pumps to run significantly increasing the power consumption of the pumping station Second the motor requires more power to turn the motor shaft as the rag ball builds increasing power consumption by an additional 5 to 15 percent All of this will happen without the pump actually tripping therefore the plant operator may not see that any problem exists If the intelligent controller monitors the pumps in real time and detects the build up of FOG or these initial

    Original URL path: http://www.wateronline.com/doc/tackling-flushable-wipes-the-intelligent-way-0001 (2016-02-14)
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  • Grit Particle Settling Refining The Approach
    the equivalent sand particle having the same settling velocity as the slower settling endemic or native grit particle The SES concept is discussed in more detail elsewhere 5 The diagonal black line in Figure 3 indicates the expected settling velocity based on conventional ideal assumptions It can be seen that as the particle diameter gets larger than 100 micron the settling velocity appears to be impacted more significantly by the deviations from the ideal characteristics It is expected that this effect will diminish as the ratio of surface area to volume decreases with increasing particle diameters further to the right of the chart Figure 3 Physical size of grit particles vs Sand Equivalent Size SES settling velocity Stokes Law Stokes Law is a common tool for estimating the settling velocity of grit particles based on the assumption of laminar flow It has been found to be accurate where Reynolds numbers are less than 1 2 A review of the Reynolds number for grit particles in the typical design range of 50 500 micron for wastewater grit removal systems shows that the impact of transitional flow begins to affect particle settling above the 100 micron range resulting in a departure in predicted accuracy using Stokes Law Table 1 Reynolds Number vs diameter Recommended Corrections While a force balance requires an iterative process to determine settling velocity it can be an irreplaceable tool by virtue of the physical characteristic corrections that can be layered in to refine the results towards real world measurements Figure 4 illustrates the impact of eliminating common assumptions aimed at simplifying the calculation and adding in refinements to align theory with field measurements First the settling velocity of a range of particle diameters is calculated using a laminar assumption Stokes Law 2 Then the laminar assumption is removed resulting in a force balance Newton s Law 2 Subsequently the assumption that grit sand is a perfect sphere is eliminated and the equation is corrected for the angularity of the particles Newton s Law with Shape Factor 6 7 8 Then an adjustment is made for the density of the particle based on field observations 9 Finally all refinements are combined and plotted Figure 4 Settling velocity refinements settling velocity vs particle diameter Overall Figure 4 shows that the commonly used Stokes Law may not be the best approach to ensure an appropriate design to capture grit particles larger than 150 micron Focusing on Newton s Law it can be seen that simply eliminating the laminar flow assumption in and of itself will result in a more conservative design in the critical 50 300 micron range With each successive refinement a level of realism is incorporated Table 2 Calculated particle settling velocity Figure 5 plots the physical size distribution of grit at a typical wastewater treatment plant as well as the sand equivalent size based on the settling velocity It can be seen that nearly 70 of the grit entering the plant is larger than 212 micron 75 mesh

    Original URL path: http://www.wateronline.com/doc/grit-particle-settling-refining-the-approach-0001 (2016-02-14)
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  • Wastewater Collection Systems Documents on Water Online
    facilities are responsible for a variety of pretreatment processes including initial debris screening and removal Decentralized Wastewater Treatment Shines As Aquifer Recharge Solution 9 21 2015 Decentralized wastewater treatment systems have come a long way Learn how new advancements have broadened their potential and may provide relief to fast depleting groundwater resources Project Clean Lake Breaks New Ground In Pollution Control 8 31 2015 The Northeast Ohio Regional Sewer District s 3 billion pollution control plan includes massive and lengthy tunnels but goes the extra mile by adding advanced wastewater treatment The Do s And Don ts Of MBR Pretreatment 5 5 2015 They say a picture s worth a thousand words If that s true this image of a fouled membrane bioreactor MBR system needs little prelude it s simply what happens when you don t properly protect your membranes with pretreatment Tackling Flushable Wipes The Intelligent Way 4 6 2015 Wet wipes labeled as flushable create costly pump clogs and time wasted for collection system operators But the problem can be resolved before it starts Grit Particle Settling Refining The Approach 3 25 2015 Grit settling velocity is significantly impacted by variability in size density and shape The conventional assumption of spheres with a specific gravity of 2 65 is inadequate for characterizing grit Slots vs Holes In Preliminary Treatment Screening 3 25 2015 The impact of preliminary treatment i e grit removal screening washing compacting of screenings handling of screenings and resource recovery on downstream processes is becoming more apparent as the industry looks for ways to reduce operating costs and increase process results What Are You Wasting In Your Handling Of Wastewater And Why 11 17 2014 When someone defines something that you are doing and the definition is not particularly pleasant in your view how

    Original URL path: http://www.wateronline.com/hub/bucket/wastewater-collection-systems (2016-02-14)
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