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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 as regards a Septic Tank: 1. The size required is large and uneconomical when serving more than roughly 100 persons. 2. It can remove around 90% of BOD and 80% of suspended solids. 3. As compared to the sludge holding of a plain sedimentation tank, a septic tank can hold about 90% less of sludge volume. 4. Frequent removal of sludge is not required. Which of the above statements are correct?
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:
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
Secondary sludge includes treated sewage sludge.
In the question below is given a statement followed by two courses of action numbered I and II. You have to assume everything in the statement to be true and on the basis of the information given in the statement, decide which of the suggested course of action logically follow(s) for pursuing. Statement: Bacteria is very helpful in sewage treatment. Courses of Action: I: The people should avoid adding bacteria during sewage treatment. II: Anaerobic bacteria break down sludge and they produce methane gas.
I used to travel frequently. Which one is the closest in meaning to "frequently"
A __________ in a social graph is a group of people who interact frequently with each other and less frequently with others.
A . . . . . . . . in a social graph is a group of people who interact frequently with each other and less frequently with others.
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as