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Waste Water Treatment Exam 3 Questions with Correct Answers

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2023/2024 Written for academic year
Institution Advanced Water Treatment
Course Advanced water treatment
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Name and define the stages of waste water treatment. - Answer-1. Preliminary treatment Screening Shredding Grit removal Oil/grease flotation removal 2. Primary treatment Removal of easily settleable solids/organic matter Removal of floating scum Sedimentation 3. Secondary treatment Removal of biodegradable, soluble organics and suspended solids Biological treatment (activated sludge process), trickling filters/bio towers, lagoons Sedimentation Disinfection 4. Tertiary treatment (advanced waste water treatment) Any treatment past secondary treatment typically will consist of P,N removal 5. Sludge Treatment Anaerobic digestion, removal of water (thickening and dewatering)and composting 6. Pre-Treatment of Industrial Waste Water (sometimes needed to make industrial wastewater 'treatable' by the municipal treatment plant pH neutralization metals removal removal of toxic organics What is the objective of primary treatment? - Answer-Treatment by sedimentation to remove readily settleable solids/floating material and thereby reduce suspended solids content. Primary clarifiers designed on the basis of overflow raters. Vo= Flow rate (Q) / Tank surface area (A) What is the objective of secondary treatment? - Answer-Removal of biodegradable, soluble organics and suspended solids Biological treatment (activated sludge process)

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