| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and apparatus for controlling the amount of fed sludge solid in a sludge dehydrator which can cope with rapid concentration changes of various kinds of sludge to be dehydrated, different in properties with one kind of sludge concentration sensor, and exhibit the original performance of the dehydrator sufficiently without causing poor coagulation. SOLUTION: Sludge is transferred from a sludge storage tank 2 into a sludge intermediary tank 3 by a sludge transfer pump 4. The concentration of sludge homogenized by a sludge agitating pump 7 in the sludge intermediary tank 3 is measured by a concentration sensor 8. The amount of sludge solid fed from the sludge intermediary tank 3 into a coagulation and mixing tank 10 by a sludge feed pump 9 is measured by a flowmeter 11. The liquid level fluctuation in the tank 10 is measured by a water level sensor 20. A frequency obtained based on the measured values by an operation part 16 of a control panel 15 is outputted into an inverter 17 for controlling the revolution number of the sludge feed pump 9 to control the revolution number of the pump, which feeds the sludge solid at a constant feed amount per hour to the sludge dehydrator 1 through the coagulation and mixing tank 10. COPYRIGHT: (C)2007,JPO&INPIT
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