Correct option is D) There are three levels of the sewage water treatment namely primary, secondary and tertiary treatment. The primary treatment of sewage water involves filtration and sedimentation of solid waste within the water. The secondary treatment of sewage water involves biofiltration, oxidation and aeration.
What does primary sewage treatment involve?
Primary treatment of wastewater involves sedimentation of solid waste within the water. This is done after filtering out larger contaminants within the water. Wastewater is passed through several tanks and filters that separate water from contaminants.
What is the first process in the primary treatment of sewage?
Treatment StepsStep 1: Screening and Pumping. ... Step 2: Grit Removal. ... Step 3: Primary Settling. ... Step 4: Aeration / Activated Sludge. ... Step 5: Secondary Settling. ... Step 6: Filtration. ... Step 7: Disinfection. ... Step 8: Oxygen Uptake.
What occurs during the primary sewage treatment stage?
In primary treatment, sewage is stored in a basin where solids (sludge) can settle to the bottom and oil and lighter substances can rise to the top. These layers are then removed and then the remaining liquid can be sent to secondary treatment. Sewage sludge is treated in a separate process called sludge digestion.
What are the process involved in primary treatment?
Primary treatment removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation.
What is primary treatment?
Listen to pronunciation. (PRY-mayr-ee TREET-ment) The first treatment given for a disease. It is often part of a standard set of treatments, such as surgery followed by chemotherapy and radiation.
What is primary and secondary treatment of sewage?
There are two basic stages in the treat- ment of wastes, primary and secondary, which are outlined here. In the primary stage, solids are allowed to settle and removed from wastewater. The secondary stage uses biological processes to further purify wastewater. Sometimes, these stages are combined into one operation.
What is preliminary treatment of wastewater?
1 Preliminary treatment. The objective of preliminary treatment is the removal of coarse solids and other large materials often found in raw wastewater. Removal of these materials is necessary to enhance the operation and maintenance of subsequent treatment units.
What is the first step in primary sewage treatment plant Mcq?
1. What is the first step in primary sewage treatment plants? Explanation: Sewage treatment is one of the efficient ways to reduce the pollution load happening on marine waters. The primary treatment first undergoes for course screening which then proceeds to other steps like fine screening and all.
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