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Secondary treatment (mostly biological wastewater treatment) is the removal of biodegradable organic matter (in solution or suspension) from sewage or similar kinds of wastewater. [ 1 ] : 11 The aim is to achieve a certain degree of effluent quality in a sewage treatment plant suitable for the intended disposal or reuse option.
Shanghai Zhuyan I Wastewater Treatment Plant [16] Shanghai China: 2004 1 700 000 Stonecutters Island Sewage Treatment [17] Hong Kong China: 2001 2 765 000 [18] Bailonggang Wastewater Treatment Plant Shanghai China: 1999 2 000 000 Gabal el Asfar Wastewater Treatment Plant Cairo Egypt: 1 700 000 2 500 000 [19] 1.63 Beckton Sewage Treatment Works ...
The aeration stage and the disinfecting stage are the primary differences from a traditional septic system; in fact, an aerobic treatment system can be used as a secondary treatment for septic tank effluent. [1] These stages increase the initial cost of the aerobic system, and also the maintenance requirements over the passive septic system.
One of the options was to connect Wainuiomata to the Hutt Valley wastewater treatment system that was in the planning stage at that time. [92] In 1998, tenders were called for a design, build and operate contract for a treatment plant to be built in Seaview that would provide secondary treatment of all sewage from the Hutt Valley and ...
The water resources of Singapore are especially precious given the small amount of densely settled land. Singapore receives an average of 2,400 mm of rainfall annually, well above the global average of 1,050 mm. The constraint is the limited land area to catch and store the rainfall, and the absence of natural aquifers and lakes. [11]
The RBC process allows the wastewater to come in contact with a biological film in order to remove pollutants in the wastewater before discharge of the treated wastewater to the environment, usually a body of water (river, lake or ocean). A rotating biological contactor is a type of secondary (biological) treatment process.
The term sewage treatment plant (STP) (or sewage treatment works) is nowadays often replaced with the term wastewater treatment plant (WWTP). [7] [8] Strictly speaking, the latter is a broader term that can also refer to industrial wastewater treatment. The terms water recycling center or water reclamation plants are also in use as synonyms.
Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term " septage " also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks .