Scum Removal Articles

  • Enhanced phosphorus removal in the DAF process by flotation scum recycling for advanced treatment of municipal wastewater

    To remove phosphorus (P) from municipal wastewater, various types of advanced treatment processes are being actively applied. However, there is commonly a space limit in municipal wastewater treatment plants (MWTPs). For that reason, the dissolved air flotation (DAF), which is well known for small space and flexible application process, is preferred as an additive process to enhance the removal ...


    By IWA Publishing

  • Amnite k100 & k150 case study

    This trial was carried out in the waste water treatment plant of a paper mill with severe bulking problems. Large amounts of suspended solids regularly overflowed from the secondary clarifier and the aerated lagoon had a scum layer of about 20cm on top. This scum layer contained a lot of filamentous bacteria. The effluent from the clarifier flowed into a river resulting in visual floating clumps ...


    By Cleveland Biotech Ltd.

  • Occurrence of Microthrix parvicella in sequencing batch reactors

    Sequencing batch reactors (SBRs) are known for high process stability and usually have a good sludge volume index (SVI). Nevertheless, in many SBRs in Germany for municipal wastewater treatment, scum and foam problems can occur, and SVI can be larger than 200 mL/g. The microscopic investigations of the activated sludge from plants with nitrogen and phosphorus removal have shown that Microthrix ...


    By IWA Publishing

  • Steam Wash Systems: Simplifying Soap Scum Removal

    Bathroom maintenance is one of the most demanding cleaning applications in most hospitality settings and restrooms. The floors, walls, show stalls, bathtubs, and sliding doors can quickly develop rust, hard water, and soap scum with daily use. This is primarily due to the high moisture levels, poor lighting, and minimal air circulation in these areas. Sometimes, the use of best chemicals or hours ...


    By Daimer Industries Inc.

  • Blue green algae in Harbour case study

    In May 2007 LG Sound proposed treatment for a harbour in the Netherlands, called Tholen. The harbour, which measured approximately 1 Km in length, suffered badly from blue-green algae growth. Blue-green algae produce toxins, which can be harmful form humans and animals and lead to major fish die offs. The toxin concentration and smell in the harbour from Tholen was so bad that recreational use ...


    By LG Sonic

  • Wireless control for valve actuators

    At first glance, wireless network control and its application to valve actuation might not impress many plant engineers as being an earthshaking technological development. Yet, because of the tremendous cost savings that can result, the benefits associated with its adoption can be dramatic – an evolutionary achievement that is likely to change the process plant landscape for decades to ...


    By Rotork

  • Amnite k100/k150 case study

    This trial was carried out in the waste water treatment plant of a paper mill with severe bulking problems. Large amounts of suspended solids regularly overflowed from the secondary clarifier and the aerated lagoon had a scum layer of about 20cm on top. This scum layer contained a lot of filamentous bacteria. The effluent from the clarifier flowed into a river resulting in visual floating clumps ...


    By Cleveland Biotech Ltd.

  • Algae Control Spray System for a southern Nevada Wastewater Treatment Plant

    Nicknamed "NESI" by the facility staff both because of its large size and slight  resemblance to the mythical Lochness Monster, this WeirWasher Automated Cleaning System also has the important ability to submerge, resurface, and telescope.  These motions are necessary to control the prolific algal growth on the weirs and effluent launder in the circular secondary clarifier. The ...


    By GillTrading.com, Inc.

  • Environmentally friendly cogeneration plant saves time and money with Oil Skimmer

    The U.S. Environmental Protection Agency Performance Track Program is a prestigious program that recognizes the accomplishments of manufacturing facilities that lead the way for improving their facilities’ environmental performance (i.e. reduce air emissions and consumption of water). Brooklyn Navy Yard Cogeneration Partners L.P. is an elite member of this program. They have been recognized for ...


    By Oil Skimmers, Inc.

  • Lipid Degradation in a Two-Phase Anaerobic SBR and Upflow Anaerobic Sludge Blanket

    LCFAs, the intermediate products in lipid biodegradation are known to inhibit microorganisms by their toxicity and floatation. To reduce LCFA inhibition, two-phase anaerobic system, consisting of anaerobic sequencing batch reactor (ASBR) and upflow anaerobic sludge blanket (UASB) reactor, was applied to synthetic dairy wastewater. During 153 days of continuous operation, two-phase system showed ...

  • Artificial mixing to reduce growth of the blue-green alga Microcystis in Lake Nieuwe Meer, Amsterdam: an evaluation of 7 years of experience

    The problem of Lake Nieuwe Meer (area = 1.3 km2, max. depth 30 m, Ptot = 500 mg/m3) was extensive growth of Microcystis with disturbing scum forming. Since 1993 the lake has been artificially mixed in summer by a bubble plume installation. The result is quite successful since the mass of Microcystis is up to 20 times lower than in the years before mixing and no scum is present any more. The study ...


    By IWA Publishing

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