| 摘要 |
PURPOSE:To dehydrate stably by controlling the revolving speed of a dehydrator on the basis of the filtration rate of the filtrate of the dehydrator calculated from the concn. of the sludge to be supplied to the dehydrator, the flow rate of the washing water, and the flow rate of the filtrate from the dehydrator. CONSTITUTION:The flow rates of the filtrate and the washing water are obtained as the signals respectively from a filtrate flowmeter 7 and a washing water flowmeter 8, and the filtration rate of the filtrate is calculated by an arithmetic unit 9. The filtration rate is controlled by controlling the revolving speed of the drum of the dehydrator in accordance with the sum of the output, corresponding to the difference between the set value and the calculated value of the filtration rate of the filtrate, and the output corresponding to the difference between the set value and the calculated value of the concn. of the supply sludge. Accordingly, the revolving speed of a driving motor 11 of the drum of the dehydrator is controlled by a regulator 14 on the basis of the output of a desired revolving speed value of said drum obtained from an arithmetic unit 10 and the output from a tachometer 6 of said drum.
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