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 ?
Tenders are invited for alterations and extensions to andresna house to include ground floor extensions of 74 q m and the conversion of a two storey out building to living accommodation, floor area 75 sq m and decommissioning of an existing tank and provision of a new waste water treatment system and tertiary treatment at andresna td, corrigeenroe, via boyle, co sligo.
Dissolved oxygen content reached 40 mg per litre in 2014 for dual treatment systems and 10 mg/litre for tertiary treatment, the report said, adding that its percentage dropped in 2014.
Protests erupted last month after UNRWA changed its policy obliging Palestinians to pay a share of the cost of secondary medical treatment in exchange for further financial support in tertiary treatment.
In statements to Cyprus News Agency Manoli spoke of the excellent quality of recycled water in Cyprus, as it is produced after having undergone tertiary treatment and is suitable for use in all crops apart from leafy green vegetables consumed raw, such as lettuce and cabbage.
Traditional wastewater removes solids and oils, filters the water and degrades the biological content of the sewage, and then a tertiary treatment further improves the quality of the water before it is released.
All treatment stations to be renovated to tertiary treatment," said Assaf.
Risk might be reduced through frequent hand washing and the use of gloves among WWTP workers and through tertiary treatment of wastewater that is to be used for irrigation.
The facility includes pretreatment (screening and grit removal), primary treatment (an anaerobic pond), a secondary treatment (3 aeration tanks) and a tertiary treatment (2 maturation ponds).
The tertiary treatment process is to utilise ozone and biological media filtration to cut colour, odour and suspended solids, followed by secondary ozonation, while ultraviolet radiation and chlorine will be used for disinfection.
AaAaAa The treated wastewater infrastructures depend on two additional treatment units with an overall capacity of 20,000 m3/a day, an ultraviolet disinfection tertiary treatment and a 2,500 m3-tank.
READERS will recall that as a result of lobbying by the public, politicians and medical professionals and of course, The Daily Post, the Minister of Health at the WAG gave a committment to the people of North Wales that they would continue to receive specialist tertiary treatment at NHS hospitals in Liverpool, Manchester or elsewhere.
As the entire Belgian territory is considered a sensitive area, all urban waste water must first undergo secondary and tertiary treatment before it is released into the environment.