JP2005007338A5 - - Google Patents

Claims (12)

  In the sludge treatment apparatus that adds flocculant to the stock solution in the coagulation mixing tank (5) to form suspended substance flocs and supplies the stock solution to the dehydrator (12), the stock solution is supplied to the dehydrator (12). The size of the floc in the stock solution supply pipe (13) is photographed, the luminance signal is converted into an electric signal, the floc magnitude is binarized from the electric signal, and one floc from the binary image of the floc The average analysis area is calculated, the average analysis area is compared with a preset standard area of flocs, an appropriate value is calculated, and the flocculant injection rate of the proportional setting value is controlled based on the formation state of flocs A control method for injecting the flocculant   The flocs in the stock solution supply pipe (13) are photographed every predetermined time, and the binarized data is averaged for several times, and an appropriate value is compared with the analysis area of the flocs and a preset reference area. The coagulant injection according to claim 1, wherein the coagulant injection rate is changed, the coagulant injection rate of the proportional set value is changed by increasing or decreasing the rotation speed of the coagulant injection pump (9), and remeasured after a few minutes. Control method.   The flocculant injection rate for the change in the amount of suspended solids contained in the stock solution is changed, the average analysis area of the floc is compared with the reference area, and when the average analysis area is larger than the reference area, the flocculant injection pump (9 ) When the average analysis area reaches the upper limit of the reference area, the current coagulant injection rate is maintained and the average analysis area is still larger than the reference area, and this operation is repeated. The flocculant injection control according to claim 1 or 2, wherein when the flocculant injection rate reaches a set lower limit value, an abnormal signal is output while maintaining the rotational speed of the flocculant injection pump (9). Method. The flocculant injection rate for the change in the amount of suspended solids in the stock solution is changed, the average analysis area of floc is compared with the reference area, and when the average analysis area is smaller than the reference area, the flocculant injection pump (9) When the rotation speed is increased and the average analysis area reaches within the lower limit of the reference area, the current coagulant injection rate is maintained and the average analysis area is still smaller than the reference area. The agglomeration according to any one of claims 1 to 3, wherein when the agent injection rate reaches a set upper limit, an abnormal signal is output while maintaining the rotational speed of the agglutinating agent injection pump (9). Agent injection control method.   When supplying a constant stock solution amount to the dehydrator (12), the average analysis area of the floc is compared with the reference area. If the average analysis area is larger than the reference area, the injection rate of the flocculant is decreased and the average analysis area is When the upper limit of the reference area is reached, the current coagulant injection rate is maintained, and when the coagulant injection rate reaches the set lower limit by repeating the above operation, the coagulant injection pump (9) 3. The flocculant injection control method according to claim 1, wherein an abnormal signal is output while maintaining the rotational speed. When supplying a certain amount of stock solution to the dehydrator (12), the average analysis area of the floc is compared with the reference area. If the average analysis area is smaller than the reference area, the flocculant injection rate is increased and the average analysis area is When reaching the lower limit of the reference area, the current coagulant injection rate is maintained, and when the coagulant injection rate reaches the upper limit set by repeating the above operation, the coagulant injection pump (9) The flocculant injection control method according to any one of claims 1, 2, and 5, wherein an abnormal signal is output while maintaining the rotational speed.   When the calculated average analysis area of flocs is larger than the reference area, the flocculant injection rate is decreased, and at the same time, the rotation speed of the stirrer (11) of the agglomeration mixing tank (5) is increased. When the flocculant injection rate and the rotation speed of the stirrer (11) are maintained, the above operation is repeated and the flocculant injection rate reaches the lower limit value set. The flocculant injection control method according to any one of claims 1, 2, 3, and 5, wherein an abnormal signal is output while maintaining the rotation speed of the agent injection pump (9) and the agitator (11). . When the calculated floc analysis area is smaller than the reference area, the flocculant injection rate is increased, and at the same time, the rotation speed of the stirrer (11) of the flocculent mixing tank (5) is decreased. When the value falls within the lower limit, while maintaining the current flocculant injection rate and the rotation speed of the agitator (11), the above operation is repeated, and when the flocculant injection rate reaches the set upper limit , The flocculant injection control method according to any one of claims 1, 2, 4, and 6, wherein an abnormal signal is output while maintaining the rotation speed of the agent injection pump (9) and the agitator (11). .   The stock solution and the flocculant are supplied to a closed flocculent mixing tank (5) to form a floc of suspended solids contained in the stock solution, and the stock solution is dehydrated by the tank pressure of the flocculent mixing tank (5). In the stock solution supply apparatus to be supplied to the TV, a viewing window (14) is provided in the stock solution supply pipe (13) connected to the dehydrator (12), and the viewing window (14) captures the size of the floc of the suspended substance. (15) is provided, and an arithmetic unit (17) for binarizing the captured flock image and accumulating the average analysis area per floc is provided, and the average analysis area of the accumulated frock and a preset reference area are provided. And a coagulant proportional control (22) for transmitting a command signal based on the state of floc formation and a coagulant injection pump (9) for controlling the rotational speed based on the command signal. Injection Control device.   The flocculant injection rate of the set value proportional to the fluctuation of the suspended solids contained in the stock solution is changed, and the average analysis area per floc of the stock solution supply pipe (13) is compared with the reference area, and the flocculant The number of revolutions of the infusion pump (9) is controlled, and an abnormal signal device (23) is provided in addition to the sequencer proportional control (22) to transmit an abnormal signal with the upper limit value and the lower limit value of the coagulant injection rate. The flocculant injection control device according to claim 9.   When supplying a constant amount of stock solution to the dehydrator (12), the average analysis area of the floc of the stock solution supply pipe (13) is compared with the reference area, and the rotational speed of the flocculant injection pump (9) is controlled, The flocculant injection control device according to claim 9, wherein an abnormal signal device (23) is provided in addition to the sequencer proportional control (22), and an abnormal signal is transmitted at an upper limit value and a lower limit value of the flocculant injection rate.   The average analysis area of the floc and the reference area are compared, and when the average analysis area is larger than the reference area, the rotation speed of the flocculant injection pump (9) is increased, and at the same time, the stirrer (11 ), And when the average analysis area of flocs is smaller than the reference area, the rotation speed of the flocculant injection pump (9) is decreased and at the same time the rotation speed of the agitator (11) is increased. The flocculant injection control device according to any one of claims 9 to 11, characterized in that