PROCESS AND APPARATUS FOR WASTE WATER PURIFICATION BY THE ACTIVATED-SLUDGE PROCESS

摘要

Waste water purification employing the activated sludge process with batch-wise waste water feed to the aeration tank. There is continuous aeration and water discharge from the tank. The process has a fixed dosing cycle based on historical values for the curve of the bacterial activity with the batch-wise waste water feed or a function of indicator values for this activity, specifically as a function of the oxygen concentration in the tank through an appropriate control, which briefly opens the waste water feed when, for example, an oxygen electrode indicates that an adjustable limit value has been exceeded. By means of such an oxygen electrode, an alarm signal can simultaneously be tripped if the high oxygen consumption expected after the admission of the waste water does not occur. The process is specifically useful for the treatment of waste waters which tend to form too much bulking sludge.