Operating method of gravity settling type concentration tank

Abstract

Abstract PURPOSE:To take out the amt. predetermined from a specific relationship of discharge sludge by retaining the supplied sludge in a concentration tank for an arbitrarily set period of time which is longer than the time required for concentrating the sludge to a desired concn. and is shorter than the time for the sludge to putrefy and foam. CONSTITUTION:The flow rate Qin and the concn. Cin of the sludge 5 supplied into a gravity settling tank 6 are measured momentarily with a flowmeter 12 and a densitometer 13, and the values are stored in the storage in an operation control unit 19. The desired value of the effluent amt. Qef of sludge is calculated by an arithmetic unit in the operation control unit 19 on the basis of the equation from the measured value Cef of the densitometer 18, and the flow rate Qin(t-R) and Cin(t-R) of the supply sludge which are stored and measured at the set reference retention time R(e.g. 9hr) earlier than the measuring time (t). A sludge discharging pump 16 is driven so that the effluent amt. of sludge may be consistent with said calculated value.

Inventors

• 👤 Hironari Takabayashi
• 👤 高林　宏成
• 👤 Kunihiko Karashima
• 👤 辛島　邦彦

Bibliographic Details