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A.2.Tick() the correct options:The wastewater produced and released by hospitals isO b(b) commercial sewage(a) domestic sewage(c) industrial sewage(d) rainwaterThe organic impurities present in sewage are(a) bacteria 0 (b) phosphorus (c) human faeces O (d) nitrates3. An underground network of interconnected pipes is called(a) sewageO (b) sewers O (c) sewerage(d) sewing4. Anaerobic bacteria is added in the digester tank to decompose the organic matter to produce(a) foul smell0 (b) biogas O (c) sludge O (d) sewage5. Floating impurities (such as grease) in the sedimentation tank are removed by(a) screens 0 (b) skimmer O (c) cleaner6. Which one of the following is an example of low cost onsite sewage disposal system?O (d) floater(a) septic tanks O (b) chlorination (c) land fillo(d) draining |
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Answer» Explanation: |
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