drain plug Articles

  • The Evolution of Plug Flow BNR at Durham AWWTP

    ABSTRACTThis paper describes experiences with plug flow nitrification and plug flow biological nutrient removal (BNR) at Durham Advanced WWTP. The kinetic advantages of the plug flow configuration for nitrification have been recognized for some time; however, limited plug flow BNR process design information was available at the time (1997). The case study began with pilot testing in 1998, during ...

  • An inflatable plug works better than bypass pumping when closing off a 60-inch penstock

    When Brian Simon, a project manager at Grace-Titan DVBE (based in Redding, California) first looked at the Potter Valley Bypass job it looked difficult, but straightforward. Grace-Titan was being asked to remove a section of the penstock that supplies Pacific Gas & Electric's (PGE) Potter Valley hydroelectric plant and install a Y-branch. But that meant that the five-foot diameter penstock ...


    By Petersen Products Company

  • Power plants use oil skimmers to prevent contamination from spills

    Most hydroelectric plants designed in the 1960s were built with a station drainage sump that collects all drainage from the plant. As designed, float switches activate sump pumps that discharge liquids directly into the tailrace. The system cannot distinguish between types of liquids, so in the event of an oil leak, oil in the sump could be released into the tailrace. Modern ...


    By Oil Skimmers, Inc.

  • I think I smell sewer gas – what should i do?

    The first thing is to make sure the smell is sewer gas—usually a rotten egg smell—and not a natural gas smell—usually smells like a skunk. If you think it’s the natural gas smell, call the natural gas company immediately and if it’s anything but a very faint small—evacuate your home, office, or whenever it is—and wait for the gas company to give you an ...


    By Atlantic Environmental, Inc.

  • ARCO Chemical - Case Study

    Custom Designed Furnace Reclaims $100,000 Condenser PCPC burn-off oven removed 4,240 lbs. of styrene polymer in compliance with local environmental laws. The Problem: ARCO Chemical Company's Beaver Valley plant in Monaca, PA, a manufacturer of styrene-based plastics, was experiencing severe problems and expense with the periodic cleaning of their ...

  • Issue highlight: Air Effluent Control RotaBed Scrubber: One way to meet Cluster Rules in the bleach plant case study

    The so-called Cluster Rule promulgated by the US EPA at the end of 1997 seeks to legislate control of both air and water emissions under one, all-encompassing regulation. With proper design and application, Cluster Rule requirements can be met easily and economically on modern kraft bleaching sequences using fluidized bed gas scrubbing technology such as the Rotabed, a product of Bionomic ...


    By Bionomic Industries Inc.

  • Solving Basement Water Problems

    Working as a MA realtor for almost twenty five years, I can say without a question that one of the greatest fears of any home owner is having a water problem in their basement! When buying a home, the uneasiness of having a water issue will be magnified ten fold if the intention of the owner is to finish the basement as additional living space. Having a little bit of water in a 200 year old ...


    By EnviroVantage

  • Clarifier maintenance

    Clarifiers are expensive, to buy or repair, and their downtime can be costly in fines imposed by regulatory agencies and in community ill will. Regular maintenance, an annual inspection of the mechanism and an occasional touchup of the paint or coating system are simple and inexpensive proactive steps that will usually prevent most problems. Three components of all clarifiers require maintenance: ...


    By WesTech Engineering, Inc.

  • Optimization of EVO delivery improves enhanced reductive dechlorination of groundwater

    Optimization of an emulsified vegetable oil (EVO) delivery system led to uniform distribution and ongoing biological treatment of a PCE source area last summer at the former Naval Training Center (NTC) in Orlando, FL. Remedial efforts targeted contaminated ground water at a former laundry and dry cleaning facility at NTC's Operable Unit 4 (OU4), where earlier injections of potassium permanganate ...

  • Casebook New Scrubber Technology reduces installation costs case study

    A100,0000-actual-cubic-feet-per-minute (acfm) RotaBed scrubber recently supplied to Tri-Gen Biopower for sulfur dioxide (S02) control at Gilman Paper, St. Mary's, Ga., saved the company an estimated $150,000 in installation costs-Installation of a heavier packed tower would have required extensive reinforcement of an existing steel support structure, said Ken Schifftner, product/district manager ...


    By Bionomic Industries Inc.

  • Geotextiles in Construction Dewatering

    Woven geotextiles work wonders in dewatering applications as wraps around well screens and sump pit screens. The textile can be sewn into sleeves or tubes to be slid over the well screen or sump pit framework. This technique allows the user to compensate for well screens with slots that are too large or for sump pit piping with large perforations. By adding the geotextile sleeves the user ...


    By Griffin Dewatering

  • Controlling condensation - controlling mold

    You know those water stains on the ceiling tiles in your office that you are certain are caused by a leaky roof.  Of course, the maintenance man thinks your crazy, since your office is not on the top floor.  He dutifully changes the ceiling tile and a month later the water stain is back but this time it has those little black circles that look like mold colonies. Sound familiar? There ...

  • Controlling condensation- controlling mold

    You know those water stains on the ceiling tiles in your office that you are certain are caused by a leaky roof. Of course, the maintenance man thinks your crazy, since your office is not on the top floor. He dutifully changes the ceiling tile and a month later the water stain is back but this time it has those little black circles that look like mold colonies. Sound familiar? There seems to be ...

  • KPDES Permit Compliance: Metals in Wastewater Effluent at Fort Knox

    ABSTRACT Prior to constructing a new FOTW, Fort Knox had a history of exceeding KPDES effluent limitations for ammonia and BOD. The new 6 MGD FOTW solved the problem, but metals exceedances became an issue. The exceedances could be linked to several factors: low water-quality based effluent limitations (WQBELs) on the new KPDES permit, high background concentrations of some metals, and high ...


    By Weston Solutions, Inc

  • Techniques for Soot in Oil Analysis

    Since no engine is 100% efficient, products other than carbon dioxide and water will be formed during combustion. One such product produced from incomplete combustion is soot. Soot is a mass of mainly carbon particles that are typically spherical in shape. As soot levels rise, the soot particles begin to clump together and ...


    By Spectro Scientific

  • Frying oil reclaimed with Abanaki oil grabber® model 8 skimmer

    Golden West Foods' (GWF) circulating water system picks up more than 200 gallons of frying oil every day. The oil enters the wastewater drains during sanitary washdowns. This oil sediment plugs bends in the piping that returns oil to the fryer filter. This sediment - causing oil overflows - comes from the the coating on products such as onion rings and French toast made at the company's Bedford, ...


    By Abanaki Corporation

  • Heat recovery from wastewater

    Heat recovery from gray water is particularly important in water-intensive industries such as pulp and paper plants, dairies and breweries. Rather than flushing used water down the drain, consider whether a heat exchanging system can help you put that energy to work in your process again. Most plant operators arc aware of the need to save money and reduce the environmental impact of their plant ...


    By DDI Heat Exchangers Inc.

  • Oil Skimmer makes oil/water separator more efficient

    Industrial facilities depend on oil/water separators to separate oil from its waste water. While oil/water separators are a helpful component to a plant's wastewater system, oil/water separators traditionally do not provide an efficient method of removing oil once it has been separated from the waste stream. Traditionally, the separator industry has either used overflow skimmer pipes or weirs, or ...


    By Oil Skimmers, Inc.

  • Modeling of Sedimentation in Stormwater Detention Basins

    ABSTRACTTo minimize the non-point source pollution from roadway surface, the Texas Department of Transportation (TxDOT) initiated a research project for design of a small footprint non-proprietary detention basin, which consists of pipes and box culvert sections with specialized inlet and outlet system. A conceptual model was developed to estimate particle removal efficiency of the rectangular ...

  • ECS compost aeration floors - the foundation of aerated compost system design

    Inventive minds have come up with an amazing number of variations to channel air through a floor and into, or out of, a compost pile. Designs that have been based on sound engineering calculations and experience have generally worked. However, since all aeration floors are constrained by physics and Murphy, the floors that were less rigorously designed have not faired well. The characteristics by ...


    By Engineered Compost Systems

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