Municipalities

The vision of municipal wastewater treatment has changed significantly over recent years. Next to the tighter consent levels, reduction of CO2 emission and energy consumption have become increasingly important. The idea that energy can be extracted from municipal wastewater and waste products can be recovered and upgraded to raw material has stimulated the development of new technology.

With the use of fine screens as pre-treatment, CirTec contributes to the objectives of the Waterboards. Finescreens relieve the biology and thereby contribute to the energy objectives. The sieved material that is secreted mainly consists of cellulose which has enormous potential as a raw material. Finescreen technology for municipal wastewater treatment is far beyond the pilot phase. Approximately 400 of the 700 Salsnes finescreens worldwide in operation, treat municipal wastewater.

Fine screens are not only used for treatment of raw influent, they are also applied for screening filtrate from centrifuges. The use of Salsnes finescreens behind overflows in combined sewer systems have proven to be a promising solution. A study CirTec has recently carried out in close cooperation with a number of Waterboards and consulting companies has demonstrated that.

  • Finescreens
    The advantages of using Finescreen technology includes superior performance, compact size, reduced sludge production and improved effluent quality. Equipment installed by CirTec has proven to be a reliable technology. Finescreens are applied for: Primary Sewage Treatment MBR Pretreatment Fishing Industry Food/Dairy Industry … Continue reading
  • Finescreening of raw wastewater
    As part of a research program, supported by STOWA (Dutch acronym for the Foundation for Applied Water Research), a Dutch Water Authority installed a Salsnes finescreen at its facilities. The operational results of the finescreen are intensively monitored, as well … Continue reading
  • Relieving biological WWTP
    Depending on the vegetables that are processed, the biological wastewater treatment plant of a large Dutch vegetable processor gets overloaded during certain periods over the year. By installing a fine screen in the feed stream, suspended solids are removed with … Continue reading
  • Removal of solids and fats
    To reduce the cost for discharge of wastewater and disposal of fats, a Dutch slaughterhouse installed a finescreen before the existing grease trap. The finescreen removes the present suspended solids (TSS) and fats (FOG) and dewaters it to a solid … Continue reading
  • Cellulose Assisted Dewatering of Sludge
    Wastewater that is discharged into the sewage system contains suspended solids that largely consists of cellulose. Cellulose which has its origin in the use of toilet paper. The CADoS technology is designed to separate the cellulose present in the sewage, … Continue reading
  • ScreenCap, finescreens at WWTP Aarle-Rixtel
    As one of the first large scale wastewater treatment plants (WWTP) in Europe, the WWTP Aarle-Rixtel is equipped with CellCap screens. The essence of the innovative concept in this project is the recovery of suspended solids from raw wastewater based … Continue reading
  • Fine filtration of centrate
    At a Dutch municipal WWTP, an enhanced system for nitrogen removal is installed to treat rejection water from the digester In order to reduce the nitrogen load at the water line. The centrate, coming from the dewatering centrifuges, contains on … Continue reading