self-cleaning fish screen Articles

  • Columbia River Gets a Vertical Fish Screen - case study

    The Columbia River is huge and runs past deserts, towns, major cities and numerous recreation areas. It is a major fishery, as well. So this screen had to protect and exclude fish, handle natural and urban debris, and operate in a constricted space.  We designed and installed large vertical fish screens with hoods. Now the irrigation canal is clean and clear of river debris. The fish are ...


    By International Water Screens

  • Floating Fish Feed Machine in Negria

    Nigeria is one of the largest fish consumers in the world. Since the demand of fish is increasing continuously, many farmers have started fish farming in small scale for fulfilling their daily family demands or in large scale for making more profit. Commercial fish farming in Nigeria has great opportunities. One of significant factors in fish farming is fish feed which can offer fish better ...

  • State Fish Hatcheries and Invasive Species Don’t Mix

    INTRODUCTION The Vermont Fish and Wildlife Department is responsible for the protection and management of the state’s fish populations. Cultured fish are stocked in natural and manmade areas that are excellent for growth and survival but have little or no spawning habitat. Other stocking areas include natural water bodies where spawning and nursery habitats have been destroyed or isolated from ...

  • Effective Removal of Zebra Mussels with Amiad Screen Technology

    Introduction The zebra mussel, native to the Black and Caspian Seas, has spread in the past few decades to waterways throughout the world mostly via ballast water. Zebra mussels, when non-indigenous to the environment, pose a serious threat to intakes of facilities that rely on fresh and brackish surface water. The mussel colonies obstruct the flow of water through the pipelines eventually ...

  • The natural way to clean wastewater

    John Todd founded Ocean Arks International in the 1980s, where he started to experiment with processes that mimic natural ways to purify wastewater. He built a greenhouse and ran sewage through a series of tanks, with plants suspended in the flowing waters, and constructed marshes made of sand and gravel. No chemicals were added, but plenty of aquatic creatures from snails to small fish were ...


    By BioCycle Magazine

  • Red Tide Cleanup with Beach Cleaners

    While the term, "Red Tide" may elicit an image of blood in the water, the coloration is due to an overabundance of microscopic algae, Karenia brevis. Besides discoloring the water, it releases a toxin that paralyzes fish, prevents them from being able to breath, and kills them. These dead fish then wash up on shore. Additionally, by consuming too much oxygen from the water, many forms of sea life ...


    By H. Barber & Sons, Inc.

  • Mono nov solves another fishy problem

    A division of Monsanto, NutraSweet Kelco is the world’s largest producer of alginate, a by-product of seaweed which is used as a natural thickener in the food, pharmaceutical, textiles and pet food industries. The efficiency of the production process and the quality of the final product is heavily dependent upon the thorough screening of river water to remove all debris, such as twigs, logs and ...

  • Mono nov solves another fishy problem

    A division of Monsanto, NutraSweet Kelco is the world’s largest producer of alginate, a by-product of seaweed which is used as a natural thickener in the food, pharmaceutical, textiles and pet food industries. The efficiency of the production process and the quality of the final product is heavily dependent upon the thorough screening of river water to remove all debris, such as twigs, logs and ...

  • Building a filter defense against Zebra and Quagga mussles

    Tiny mussels can create massive problems for intake structures, vaLves, pumps, screens and other water infrastructure around the US. Some filtration systems can provide chemical-free protection against invasive zebra and quagga mussels, but it is vital to understand the problem and develop the right system to avoid being overrun by the alien species. Zebra mussels (Dreissena polymorpha) and their ...

  • Quantifying uncertainty in the trophic magnification factor related to spatial movements of organisms in a food web

    Trophic magnification factors (TMFs) provide a method of assessing chemical biomagnification in food webs and are increasingly being used by policy makers to screen emergent chemicals. Recent reviews have encouraged the use of bioaccumulation models as screening tools for assessing TMFs for emergent chemicals of concern. The present study used a food web bioaccumulation model to estimate TMFs ...


    By John Wiley & Sons, Ltd.

  • Union county aquifer restoration

    Client: Union County Water Conservation Board  Completion Date: 2003  Services Provided 65-MGD river intake Mechanically cleaned bar screen Two traveling water screens Quarter-mile-long access bridge with service deck Four 15,050 gpm vertical turbine intake pumps 48-inch raw water ...


    By Burns & McDonnell

  • PCB dredging cleanup project begins on Lake Cochituate (USA) case study

    A large ring of yellow buoys floats beside an a LWT 8” Swinging Dragon swinging ladder dredge on the surface of Pegan Cove, marking the area where contractors have started removing sediment contaminated with PCBs, left by an accident at the Soldier Systems Center 30 years ago. The PCBs were found in the section of Lake Cochituate just to the east of Natick Labs. They came from a ...

  • Lake Taneycomo surface water intake

    Client: City of Branson, Mo. Completion Date: 1997  Services Provided Microtunneling Public information program Permitting agency reviews Air backwash system Potassium permanganate feed system Inverted bulk drum storage Architectural features Architectural ...


    By Burns & McDonnell

  • Detecting Chemical Contaminants in Drinking Water Using Bacteria-Based Biosensors

    A continuous supply of clean drinking water is something that most Americans take for granted. Even those of us in the environmental profession, who know the effort and engineering it takes to provide clean drinking water, rarely go to the tap doubting that the water will be clean and safe. Things Have Changed Since September 2001, the general population and water supply professionals have been ...

  • Hydro-Transporting Food: best practices for food processing pumps

    Processing plants look for continuous and trouble-free operation from a pump capable of transporting even the most delicate whole food products or processed foods, while keeping product damage to a minimum. This ensures the highest profits for the plant. Cornell pumps help hydro-transfer systems to clean and convey potatoes, carrots, cranberries, pickles, cherries, beans, peppers, leafy ...


    By Cornell Pump Company

  • New Flag guidance for class I area modeling

    In October 2010, final guidance was issued for assessing the impacts of new and modified sources of air pollution on Air Quality Related Values (AQRV) in Class I areas, consisting of visibility (including plume impairment and regional haze), ozone effects, and nitrogen and sulfur deposition. This guidance, which was issued in draft form on July 8, 2008, makes technical revisions to the previous ...


    By Trinity Consultants

  • New approach makes faster and efficient work of oil spills

    A comprehensive new study of oil’s behaviour in various sea conditions has resulted in significant advances in oil spill recovery using boom-style systems. Put into practice in DESMI ‘s Speed-Sweep Oil Spill Response (OSR) solution, the new approach speeds up oil recovery, increases encounter rates, covers a wider area in a shorter time and provides new flexibility in the choice of ...


    By DESMI A/S

  • Reclaimed Municipal or Industrial Wastewater for Power Plant Cooling & Boiler Feed Make-Up Water

    For centuries, water was considered a commodity product and used with little or no restriction. In today’s modern society, water is now being considered a precious resource and considerable effort is put into protecting, recycling, and restricting its use freely. State and Federal agencies have put in place guidelines and regulations restricting its use, especially for industrial use. ...

  • Ecological Risk Assessment

    In recent years, ecological risk assessment (ERA) has emerged as an important part of environmental protection programs. The following discussion provides a brief overview of ERA issues. What is ecological risk assessment? Ecological risk assessment is the practice of determining the nature and likelihood of effects of our actions on animals, plants, and the environment. ...

  • New approach makes faster and efficient work of oil spills

    A comprehensive new study of oil’s behaviour in various sea conditions has resulted in significant advances in oil spill recovery using boom-style systems. Put into practice in DESMI ‘s Speed-Sweep Oil Spill Response (OSR) solution, the new approach speeds up oil recovery, increases encounter rates, covers a wider area in a shorter time and provides new flexibility in the choice of ...


    By DESMI A/S

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