Secondary treatment of sewage:

Is physical process

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Involves aeration tank and anaerobic sludge digester

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Produces primary sludge

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Removes floating debris

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Solution

The correct option is B Involves aeration tank and anaerobic sludge digester
Secondary treatment is biological process. Primary treatment is physical process that removes floating debris and produces primary sludge. Secondary treatment involves aeration tank and anaerobic sludge digester.

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Secondary sewage treatment in a sewage treatment plant is mainly a ______________ process.

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