Abstract:1 concerning the high cost of treatment by activated sludge. This might mislead the public and the authorities concerned.51. The figures given in Table 7 worked out at about W E 5 per million gallons, or only Id. per thousand gallons, which was really extraordinarily cheap. He wondered what industry could show comparable economy in treating 5 tons of polluted liquid for a penny. Per head of population, this worked out at a cost of only one-twentieth of a penny per day. He realized that the Author had not inclu… Show more
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