scum concentrator Articles

  • 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

  • CH#1138 - Anaerobic Digesters

    Waste Type: Fats, oils and grease (FOG) in Anaerobic Digesters Problem: FOG waste poses a challenge for most municipal wastewater collection systems and treatment plants. Although fats, oils and grease will biodegrade in an anaerobic digester, high concentrations will tend to 'mat' on the sludge surface, lowering digestion efficiency. This Midwestern municipal facility was no different. The 1.5 ...


    By BIO-SYSTEMS International

  • 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

  • From theory to practice: preliminary and primary treatment residuals handling improvements

    The Upper Blackstone Water Pollution Abatement District (the “District”) treats wastewater, septage, and sludges generated in the central Massachusetts city of Worcester and surrounding communities, including a large urban area of combined sewers. This 45-million-gallon-per-day (mgd) advanced wastewater treatment facility, located near the headwaters of the Blackstone River, was constructed in ...

  • 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.

  • Dynamics of cyanobacteria and cyanobacterial toxins and their correlation with environmental parameters in Tri An Reservoir, Vietnam

    This study evaluates the water quality from Tri An Reservoir, a drinking water supply for several million people in southern Vietnam, in terms of cyanobacterial biomass and their potent toxins, microcystins (MCs). Cyanobacteria, their toxins and environmental parameters were monitored monthly for 1 year (April 2008–March 2009) at six stations covering a transect through the reservoir. Dynamics ...


    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.

  • Effect of organic loading on the performance of aerated submerged fixed-film reactor (asffr) for crude oil-containing wastewater treatment

    A large amount of water is used in oil industry for a wide variety of purposes and basic portion of it leaves this industry as wastewater containing oil, phenols, different solvents, and toxic substances  (Zhao, et al., 2006; Toril, 2001). Such wastewater can pollute water bodies, soil, and even the air if it is not treated (Yang, 2000; Chen, 2002; Vegueria, 2002). Biological treatment processes ...


    By University of Tehran

  • Condition assessment survey of onsite sewage disposal systems (OSDSs) in Hawaii

    Onsite sewage disposal systems (OSDSs) are the third leading cause of groundwater contamination in the USA. The existing condition of OSDSs in the State of Hawaii was investigated to determine whether a mandatory management program should be implemented. Based on observed conditions, OSDSs were differentiated into four categories: ‘pass’, ‘sludge scum’, ...


    By IWA Publishing

  • A Reinvigorated Approach to Operational Safety in the Design of a New Digestion System for Spokane, Washington

    ABSTRACTThe failure of Digester No. 3 at the Riverside Park Water Reclamation Facility (RPWRF) in Spokane, Washington triggered a host of changes to many aspects of project implementation, as well as daily operation. Planning, design, construction and startup of  improvements now emphasize improved communication and collaboration between the design team and plant staff, as well as a ...

  • Anaerobic Co-Digestion of a Single Source Oily Waste and High Strength Pet Food Wastewater: A Study of Failure and Revival of a Full Scale Digester

    ABSTRACTThis paper focuses on the revival of a formerly failed digester of 1800 m3 volume. The most obvious cause of failure was identified to be due to capping caused by foam and scum, as result of attempting to treat oil rich, high strength wastewater. The revival was affected by implementing co-digestion in a 3-step remedial procedure. Though in the typical sense, codigestion involves separate ...

  • Design, Construction, and Startup of Sustainable and Integrated Wetlands Treatment Process in Stockton, California

    ABSTRACTConstructed treatment wetlands have become an established technology for treatment of municipal and industrial wastewaters around the world. Wetland systems can provide treatment similar to conventional tertiary wastewater facilities if sufficient land is available but with lower energy and maintenance requirements. Ancillary benefits of treatment wetlands include wildlife habitat, ...

  • Algae Problems

    Almost everywhere where water is being stored, algae problems may occur. When water is stagnant, has a high temperature or a high concentration of Nitrates and Phosphates, an algae bloom might occur, which can cause several problems. Blue-green algae growth can cause a foul odour to the water, a layer of scum on the surface and even pose a health risk. Green algae may colour the water green, look ...


    By LG Sonic

  • Algal blooms: What are they?

    Algal blooms are also known as marine blooms or water blooms, and are actually a sudden increase in the population of algae in water scenery. Algal blooms usually take place in freshwater, such as lakes and water reservoirs as well as in marine milieus. They can be easily identified by coloration of the water ensuing from the high density of pigmented cells. Though many types of algae can form ...


    By LG Sonic

  • Water pollution · Canarina DESCAR software

    Natural waters contain micro-organism as well as solutes. There is a distinction between ‘pure’ water, meaning water that is fit to drink and pure water that is a single substance. A water pollutant is a substance that prevents the use of water for a specified purpose. The signs of polluted water are obvious. Poor drinking water tastes and smell bad. ...

  • 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.

  • Sanitation Using Ozone & Chlorine

    For nearly 100 years, ozone has been used all over the world for water sanitation. It is nature’s strongest oxidizer and has a byproduct of pure oxygen. Chlorine, on the other hand, is a very effective, time-proven chemical, but is ineffective against hard-to-kill microorganisms such as cryptosporidium. It also has some unpleasant byproducts. Together, however, these two substances can ...

  • Belgian egg processing

    Between 3 and 4 million eggs are broken daily, 5 days a week, to produce egg-white, egg-yolk, and some mixed egg products for a total of 900 - 1000 tons of end-products per week. All is done under the highest hygienic standards. The wastewater treatment plant was built 10 years ago, when the egg breaking capacity was at 1.5 million eggs per day and was engineered for handling an expansion up to 3 ...


    By BluePlanet Labs

  • Egg plant treatment in Belgium

    DESCRIPTION OF WASTEWATER TREATMENT FACILITY Between 3 and 4 million eggs are broken daily, 5 days a week, to produce egg-white, egg-yolk, and some mixed egg products for a total of 900 - 1000 tons of end-products per week. All is done under the highest hygienic standards. The wastewater treatment plant was built 10 years ago, when the egg breaking capacity was at 1.5 million eggs per day and ...


    By BluePlanet Labs

  • Introduction to Ion Exchange Part 1

    IMPURITIES IN WATERWater is often referred to as the 'universal solvent' as it will dissolve small amounts of everything it touches. Water collects or dissolves a variety of mineral salts, organic compounds and suspended solids as it flows over the earth's surface and through the ground. These impurities make water undesirable for use in many applications. It is, therefore, important to ...


    By Kinetico Incorporated

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