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Definition of Secondary treatment

Secondary treatment Definition from Science & Technology Dictionaries & Glossaries
Technical English by wpv
Treatment of boiler feedwater or internal treatment of boiler water after primary treatment.
Secondary treatment Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Sewage treatment is the process of removing contaminants from wastewater and household sewage, both runoff (effluents), domestic, commercial and institutional. It includes physical, chemical, and biological processes to remove physical, chemical and biological contaminants. Its objective is to produce an environmentally safe fluid waste stream (or treated  effluent) and a solid waste (or treated sludge) suitable for disposal or reuse (usually as farm fertilizer). Using advanced technology it is now possible to re-use sewage effluent for drinking water, although Singapore is the only country to implement such technology on a production scale in its production of NEWater.

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Secondary treatment Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
The second step in most publicly owned waste treatment systems in which bacteria consume the organic parts of the waste. It is accomplished by bringing together waste, bacteria, and oxygen in trickling filters or in the activated sludge process. This treatment removes floating and settleable solids and about 90 percent of the oxygen-demanding substances and suspended solids. Disinfection is the final stage of secondary treatment. (See: primary treatment, Tertiary Treatmenttertiary treatment.)
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
the wastewater process where bacteria are used to digest organic matter in the wastewater.