sewage treatment

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sewage treatment

the treatment of raw sewage to make it harmless for discharge into rivers, seas and oceans. Treatment systems may involve
  1. (a) Primary treatment in which physical methods are used to remove solid matter (primary sludge) from the waste-water.
  2. (b) Secondary treatment in which biological methods, involving a range of aerobic bacteria, are used to degrade the organic matter in the waste-water. The treated sewage may then be disinfected before discharge from the sewage plant. The sludge that accumulates during both primary and secondary treatments is acted on by anaerobic bacteria in an anaerobic sludge digester. The methane produced can be used as a fuel for heating the digester, whilst the treated sludge is dried and may be used as a fertilizer.
  3. (c) Tertiary treatment in which chemical and physical methods are generally used to remove all the biochemical oxygen demand (BOD), nitrogen and phosphorus. After this treatment the water is disinfected and can be pumped direct into reservoirs. However, tertiary treatment is an expensive process, so water is often returned to the environment after secondary treatment.
References in periodicals archive ?
the romantic village has been plagued by a horrible pong since its pounds 2.7million sewage plant opened last year.
Implementing agency : Yeonggwang Gun Water And Sewage Plant Office In Jeollanamdo
It will entail fixing and rerouting sewage networks in the area, improving operations in the Tubli Sewage Plant and fixing damage caused by reclamation.
Presently, septic tanks are cleared by tankers and emptied at the Al Aweer sewage plant. The capacity of the plant is 260,000 cubic metres daily, but is having to cope with 460,000 cubic metres because of an increase in population.
A WATER company has been asked to stop its sewage plant from emitting nasty smells before the Open Golf championship in July next year.
He added: ``I don't think it is possible to have a sewage plant that is completely odour free but it is important that people know how to complain.
description of the procurement: On a branch between the house "in katzem" 95 and the access to the construction area on knorrspfad in erkelenz-katzem, The sewage plant erkelenz intends to build an approximately 85 m long mixed sewage canal dn 300.
BODY parts belonging to a baby have been found by horrified staff at a sewage plant.
This is being done to save the cost of paying for sewage tankers who have recently increased their fees for making each trip to the Al Aweer Sewage Plant
United Utilities has applied for permission to expand the incineration capacity at the sewage plant in Shell Green.
A CONTROVERSIAL scheme to build a huge sewage plant on the outskirts of Holyhead has been thrown out.
the measure comprises in detail the following sub-measures: planning phase sewage plant district rittersbach mixed water treatment / rainwater treatment connection to ka georgensgmnd construction draft with documents water right including mbenberg execution phase sewage plant district rittersbach - ba 1 inlet duct rb 03, new rb 03 execution phase sewage plant district rittersbach - ba 2 pumping station and connection pressure line execution phase sewage plant district rittersbach - ba 3 reconstruction of sewage pond for rainwater treatment, decommissioning of sewage treatment plant