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1. Which of the following are claimed as advantageous in respect of aerobic sludge digestion as compared to anaerobic sludge digestion ? 1. Lower BOD concentration in supernatant liquor. 2. Production of a sludge with excellent dewatering propensity. 3. Greater production of methane. 4. Lesser operating cost. 5. Lesser capital cost. Select the correct answer using the codes given below :





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