PURPOSE: To perform proper operational control by putting the measured value, which were obtained by measuring systems usually mounted in the system of an electroosmotic dehydrator, to practical use, by setting measured amounts such as the supply amount of sludge capable of being easily measured in the system, the concn. thereof and the amount of filtered water to the detection value of a control system.
CONSTITUTION: The water content of a dehydrated cake is calculated from the supply amount Q of sludge measured by a flowmeter 14, the concn. γ% of the supplied sludge measured by a densitometer 15 and not only the sum Q1 of the amounts of filtered water from a sludge supply conveyor 8 for pre-dehydration and the press dehydration part in an electroosmotic dehydrator but also the amount Q2 of filtered water from the electroosmotic dehydration part in the system measured by flowmeters 19, 20, 21 by a water content operation apparatus 23. Because the water content of the dehydrated cake has the relation of r-1-γQ/C (wherein C=Q-aQ1-bQ2 and (a) and (b) are a constant), the voltage applied between electrodes is controlled on the basis of the above-mentioned operation value so as to make Q/C constant. As a result, the dehydrated cake with constant water content can be obtained in spite of the variation in the properties of sludge.
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MIYAIRI YASUHISA
HOSHIKAWA HIROSHI
YAMAGUCHI MIKIMASA
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