PROCESS AND APPARATUS FOR THE AEROBIC BIOLOGICAL PURIFICATION OF WASTE WATER

摘要

A method is disclosed for the biological aerobic purification of waste waters wherein a temperature from 30 DEG to 60 DEG C. is maintained in a first process stage and a temperature from 20 DEG to 40 DEG C. is maintained in a second process stage, with the temperature in the first process stage always being higher than the temperature in the second process stage and wherein a part of the activated sludge of the second process stage, after being seperated, is returned to the first process stage. The process provides a high decomposition output and produces an activated sludge which exhibits good sedimentation behavior.