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 professionals operating wastewater treatment plants play a very important role in keeping our communities and environment healthy by protecting water quality," said Alexandra Dunn, regional administrator of EPA's New England Office.
It will inevitably become a model project in leather-related wastewater treatment and have strong demonstration effect.
The TechSci report offers an insight into replacement of conventional clarifiers with Bio Mag, Co Mag and DAF (Dissolved Air Floatation) clarifiers, a driving factor that is contributing to the growth of wastewater treatment plants market in Brazil.
The professionals operating these wastewater treatment plants, as well as the municipalities and the state environmental agencies that support them, are essential to keeping our environment healthy by protecting water quality.
The Project-Co will provide twenty years of wastewater treatment service to the Water Commission of the State of Jalisco by the construction and operation of the biggest wastewater treatment facility in Mexico, with a capacity of 734,400 tons/day.
Actual certification exam questions were used to develop the many problems in these essential guides, and each book offers hundreds of math problems and solutions covering the full spectrum of wastewater treatment operations.
Although research on these methods continues, the Environmental Protection Agency and state regulators have not included these arrangements in rules that govern wastewater treatment for a number of reasons.
However, Endocrine Disruptors in Wastewater and Sludge Treatment Processes succeeds extremely well in introducing the technically oriented reader to the expanding area of EDCs, their fate in wastewater treatment processes, and their presence in sludge, surface, and drinking waters.
The firm is also doing the complete design and consultation of wastewater treatment facilities in Kingston West and the City of Pembroke.
Johnson previously was with the Virginia Poultry Federation, which used a Virginia Environmental Endowment grant to explore zero discharge alternatives in wastewater treatment for the poultry industry.
Darcy feels its would be unfair to point solely at the wastewater treatment plants as the source of high chloride levels, because the Santa Clara River is affected by factors upstream and beyond sanitation district boundaries, such as the city of Bakersfield, mining operations and natural features high in nitrates, such as Vasquez Rocks.
Real estate developers are no longer limited to building sites within reach of municipal wastewater pipelines, thanks to a leading-edge ecological wastewater treatment technology recently introduced by South Burlington, VT-based company, Living Technologies.