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1. 发明专利

JPH05138188A DEVICE FOR CONTROLLING FLOW RATE OF EXCESS SLUDGE 失效
公开(公告)号：JPH05138188A
公开(公告)日：1993-06-01
申请号：JP33628291
申请日：1991-11-25
申请人： YASKAWA ELECTRIC CORP
发明人： KANETANI TOSHINORI , FUJITA ITSURO , IDA TATSUO
IPC分类号： C02F3/12
摘要： PURPOSE:To homogenize the drawn amount of excess sludge in the respective sewage disposal series by outputting the output signal of an arithmetic device for the ratio of measured flow rate to a regulator of the flow rate of excess sludge and controlling this regulator in the respective sewage disposal series. CONSTITUTION:Arithmetic devices 12A to 12C for the ratio of measured flow rate calculated and output the ratio of output of flow meters 7A to 7C of excess sludge for the outlet of arithmetic devices 10A to 10C for the flow rate of request excess sludge. A regulator 13 for the ratio of the measured flow rate compares the arithmetic ratio of the arithmetic devices 12A to 12C for the ratio of measured flow rate with the standard ratio of measured flow rate preset in a setter 14 of the standard ratio of measured flow rate. When the whole ratio of measured flow rate is higher than the standard ratio of measured flow rate, the whole ratio is outputted to the regulators 11A to 11C for the flow rate of excess sludge without correcting the request flow rate of excess sludge. When a series having the ratio of measured flow rate lower than the standard ratio of measured flow rate is present, the corrected request flow rate of excess sludge is calculated so that the ratio of the measured flow rate in the whole sewage disposal series is made equal to the smallest ratio of measured flow rate. This corrected request flow rate of excess sludge is output to the regulators for the flow rate of excess sludge.

2. 发明专利

JPH05138187A DEVICE FOR CONTROLLING FLOW RATE OF RETURNED SLUDGE 失效
公开(公告)号：JPH05138187A
公开(公告)日：1993-06-01
申请号：JP33257791
申请日：1991-11-20
申请人： YASKAWA ELECTRIC CORP
发明人： KANETANI TOSHINORI , FUJITA ITSURO , IDA TATSUO
IPC分类号： C02F3/12
摘要： PURPOSE:To homogenize the conditions relating to the amount of activated sludge of the respective aertors in a plurality of sewage disposal systems. CONSTITUTION:In a sewage disposal controlling device equipped with a plurality of sewage disposal systems wherein sewage is introduced into aerators and mixed with returned sludge and air is supplied into the aerators to perform purification of sewage, the necessary flow rate of returned sludge is calculated by algorithm for maintaining the ratio of the flow rate of returned sludge constant for the flow rate of sewage introduced into the aerators in the arithmetic devices 10A, 10B of requested returned sludge. The measured flow rate arithmetic devices 11A, 11B calculate the ratio of the measured value for the request amount of returned sludge from both the output of these arithmetic devices and the output signals of the flow meters 6A, 6B of returned sludge. The ratio of both the necessary flow rate of returned sludge and the measured value in a plurality of sewage disposal systems is calculated by an arithmetic device 12 for regulating the rate of flow rate so that the ratio is made constant. The operation state of the sewage disposal systems is homogenized by opening and closing the control valves 7A, 7B of returned sludge in the sewage disposal systems wherein the ratio of the measured flow rate is early made large.

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