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What is a primary sludge?(a) Separation of liquid and solid phase(b) Capture of suspended solids(c) Type of wastewater treatment(d) Suspended solidsI had been asked this question during an interview for a job.Enquiry is from By-Products topic in chapter Effluent Treatment of Bioprocess Engineering

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Right CHOICE is (b) Capture of SUSPENDED solids

The explanation is: Primary SLUDGE is a result of the capture of suspended solids and organics in the primary TREATMENT PROCESS through gravitational sedimentation, typically by a primary clarifier. The secondary treatment process uses microorganisms to consume the organic matter in the wastewater.



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