Sewage treatment plant working process and device for injecting phosphates precipitation products

摘要

In a method for operating a sewage treatment plant, the electrolytic conductivity of the feed effluent (waste water) and the flow rate thereof are continuously measured and used to form a parameter (S) determining the rate of a precipitant to be added. Individual measurements of the phosphate concentration are carried out in this case. The load signal is corrected in dependence on these individual measurements. An apparatus for injecting the phosphate precipitant has a precipitant pump (12) and an actuating apparatus (14) determining the throughput. In addition, there is a conductivity metering apparatus (19) in the feed effluent, a flow meter (16) and a control apparatus (18) which continuously calculates a parameter (S) for the actuating apparatus (14) from conductivity (LF), flow rate (Q) and, if necessary, correction values. In this manner, on-line operation is possible with precipitant metering operating almost precisely. IMAGE