Secondary treatment involves the removal of biodegradable organic matter (BOD) and suspended solids (TSS) through the processes of aeration and filtration.,
Why secondary treatment is known as biological treatment?
Secondary treatment removes the dissolved organic matter by the use of biological agents and hence, known as biological treatment. This is achieved by microbes which can consume and degrade the organic matter converting it to carbon dioxide, water, and energy for their own growth and reproduction.
What is sewage treatment?
wastewater treatment, also called sewage treatment, the removal of impurities from wastewater, or sewage, before it reaches aquifers or natural bodies of water such as rivers, lakes, estuaries, and oceans.Feb 19, 2022
What is secondary treatment of sewage called Give Reason b Why is secondary treatment of sewage done explain?
Secondary treatment of sewage is called biological treatment because it involves living organisms such as aerobic or anaerobic microbes to digest the organic waste. [ 1] In this process, the primary effluent is first passed into an aeration tank where vigorous growth of aerobic microbes (flocs) takes place.
Why is secondary treatment often needed for sewage quizlet?
removes dissolved and suspended biological matter. Secondary treatment is typically performed by indigenous, water-borne micro-organisms in a managed habitat. Secondary treatment may require a separation process to remove the micro-organisms from the treated water prior to discharge or tertiary treatment.
Why is secondary treatment often needed for sewage?
Secondary treatment removes the soluble organic matter that escapes primary treatment. It also removes more of the suspended solids.
What is a secondary treatment system?
A Secondary Treatment System (STS) is a type of SMF which treats raw sewage from a single household to a high standard. STS use a secondary treatment process to produce a final effluent suitable for dispersal or utilisation on- site.
What is true about secondary sewage treatment?
Secondary sewage treatment is mainly a biological process. In secondary treatment primary effluent is passed into large aeration tanks, where it is constantly agitated mechanically and air is pumped into it. This allows vigorous growth of useful aerobic microbes into floes.
What are the steps involved in secondary treatment?
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment. (ii) Secondary sewage treatment is mainly a mechanical process. (iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
What is needed for the secondary treatment of sewage?
The secondary stage of treatment removes about 85 percent of the organic matter in sewage by making use of the bacteria in it. The principal secondary treatment techniques used in secondary treatment are the trickling filter and the activated sludge process.