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For the development of flocculent biomass for treating domestic water through Activated Sludge Process (ASP) what would be the Solid retention time considered?

For the development of flocculent biomass for treating domestic water through Activated Sludge Process (ASP) what would be the Solid retention time considered? Correct Answer 1-3 days

For the development of flocculent biomass for treating domestic water through the Activated Sludge Process (ASP), the solid retention time considered is 1-3 days. In case it is industrial waste water, the retention time considered would be different. The difference is due to the difference in concentration of BOD in the influent.

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Consider the following statements regarding activated sludge process: 1. Industries prefer activated sludge process as it requires less space, does not produce obnoxious odours and requires less time for waste water treatment compared to trickling filter. 2. It requires skilled supervision 3. Biological treatment is enhanced because shock loadings are eliminated. Which of the above statements are correct?
Biomass gasification is considered to be one of the sustainable solutions to the power crisis in India, In this context, which of the following statements is/are correct? 1. Coconut shells, groundnut shells and rice husk can be used in biomass gasification. 2. The combustible gases generated from biomass gasification consist of hydrogen and carbon dioxide only. 3. The combustible gases generated from biomass gasification can be used for direct heat generation but not in internal combustion engines. Select the correct answer using the codes given below:
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Statement (I): Anaerobic sludge digester, by itself, is considered to be the better method than other methods of sludge treatment: Statement (II): During anaerobic sludge digestion, CH4 is produced; also rodents and other pests are attracted when digester sludge is dried. 
Consider the following statements with reference to the mixing of industrial waste water with domestic waste water: 1. The industrial waste water can be mixed with domestic water when it has higher BOD. 2. The industrial waste water can be mixed with domestic water when the pH value of industrial waste water is highly alkaline. Which of the above statements is/are correct?