| 摘要 |
PURPOSE:To make the cost of a sludge treatment lower than for the conventional method by adopting biochemical oxidation and biochemical denitrification methods, eliminating the need for land treatment of sludge and sand and utilizing activated sludge as auxiliary feed. CONSTITUTION:(1) The sludge 1 of a culture farm is pumped up into a tank 3 and is settled so that the sludge is separated to sand and sludge sewer. (2) The separated sand is cleaned with the supernatant from the following stage (5) in a tank 5 and is then returned to the culture farm. (3) The above-mentioned sludge sewer and the waste water of cleaning the above-mentioned sand are supplied to a denitrification tank 9 and are subjected to biochemical denitrification while part of the waste sludge water of the following stage (4) and part of the activated sludge of the following stage (5) are circulated to the tank 9 and are stirred. (4) The sludge sewer of the tank 9 is supplied to an aeration tank 10 and is subjected to the biochemical oxidation to form the waste sludge water. (5) The waste sludge water of the tank 10 is supplied to a settling tank 13 to settle the activated sludge. Part of the supernatant is supplied to the tank 5 and the balance is returned to the culture farm. Part of the activated sludge is supplied to the tank 9 and the remainder is returned to the culture farm.
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