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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.
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.
Omni Processor pilot plant by Sedron Technologies treating fecal sludge in Dakar, Senegal. Omni processor is a term coined in 2012 by staff of the Water, Sanitation, Hygiene Program of the Bill & Melinda Gates Foundation [1] to describe a range of physical, biological or chemical treatments to remove pathogens from human-generated fecal sludge, while simultaneously creating commercially ...
Effluent from a constructed wetland for greywater treatment at an ecological housing estate in Hamburg-Allermöhe, Germany Constructed wetland for domestic wastewater treatment in Bayawan City, Negros Oriental province, Philippines. A constructed wetland is an engineered sequence of water bodies designed to treat wastewater or storm water runoff.
In Secondary Treatment, wastewater is transferred into three fine bubble-activated sludge facilities—where microorganisms metabolize organic pollutants and compromise activated sludge, which is separated from the affluent through sedimentation—before making its way to Advanced Treatment, where water is distributed between 48 sand beds, each ...
Vermifilters can be used for primary, secondary and tertiary treatment of sewage, including blackwater and greywater in on-site systems and municipal wastewater in large centralised systems. Vermifilters are used where wastewater requires treatment before being safely discharged into the environment.
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.
Activated sludge tank at Beckton sewage treatment plant, UK.The white bubbles are due to the diffused air aeration system. The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.