Combined aerobic-anaerobic bacterial treatment of sewage - in controlled pressure conditions for liq. manure or fish-rearing water tanks

摘要

Between a water inlet and outlet in an airtight container, sewage is treated by an anaerobic bacterial culture in the container base, outside the influence of the transverse distributor for the airstream from a vertical feed line, and sepd. by a permeable membrane. Within the aerated section of the container is a further bacterial culture, in this case of aerobic material. The water inlet pipe incorporates a non-return valve with a second such valve in the outlet pipe. The air outlet at the container head holds a valve whose opening and closing are controlled by pressure, water level, or elapsed time.