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The microbes drive the aerobic decomposition and anaerobic digestion of the raw sewage to eventually form a safe effluent that can be dispersed back into the environment. The byproducts of this process are eventually separated into liquids and solid matter, known as effluent and biosolids , respectively.
Solid Waste Tree, Based on Resource Conservation and Recovery Act, United States Environmental Protection Agency. Solid waste means any garbage or refuse, sludge from a wastewater treatment plant, water supply treatment plant, or an air pollution control facility and other discarded material, including solid, liquid, semi-solid, or contained gaseous material resulting from industrial ...
Sewage sludge treatment is the process of removing contaminants from wastewater.Sewage sludge is produced from the treatment of wastewater in sewage treatment plants and consists of two basic forms — raw primary sludge and secondary sludge, also known as activated sludge in the case of the activated sludge process.
The sludge is sometimes passed through a so-called pre-thickener which de-waters the sludge. Types of pre-thickeners include centrifugal sludge thickeners, [74] rotary drum sludge thickeners and belt filter presses. [75] Dewatered sludge may be incinerated or transported offsite for disposal in a landfill or use as an agricultural soil ...
Critics have argued that it does not require water companies to take action quickly, thereby allowing dumping to continue for years to come.
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Effluent sewer systems are a much less common sewage disposal method than gravity sewer systems that use gravity, as well as pumping where needed, to send raw sewage and other wastewater straight from consumers to a sewage treatment plant. There are two main types of gravity sewers, sanitary and combined. Sanitary sewers only treat the ...
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