| 摘要 |
Method for the treatment of waste water in which the waste water undergoes various processes, such as anaerobic processes, anoxic processes and aerobic processes. The processes are carried out with the aid of a population of bacteria which mainly consists of denitrifying phosphate-removing bacteria, or DPBs, with the composition of the sludge water in the various processes being maintained in such a state, by means of return flows of the sludge water to previous processes, that the DBP population achieves an optimum size. Waste water is treated by means of an anaerobic process in which the waste water is mixed with sludge water originating from an anoxic digester, with the sludge water being divided into phosphate-rich water and sludge water, to be processed separately, after which the sludge water is added to a mixing tank or contact tank, with aerobically treated sludge from a secondary sedimentation tank being added in order to improve the sedimentation properties of sludge present in the sludge water. The sludge water then goes through anoxic processes, after which part of the sludge water goes through aerobic processes while another part of the sludge water is returned from the anoxic process to the anaerobic process and goes through the previous processes again. Part of the sludge water which has gone through the aerobic processes is then returned to the anoxic process, while another part of the sludge water is conveyed to a secondary sedimentation tank, in which the sludge is separated by sedimentation into sludge and purified water or effluent. <IMAGE> |
