Biological wastewater treatment plant for municipal, commercial and agricultural wastewater and process for operating the plant

摘要

Biological treatment plant for municipal, commercial and agricultural wastewater for batchwise wastewater treatment in Aufstaubetrieb with a sludge storage, a downstream bioreactor (3) with a fluidizable microorganisms settable substrate (10) and a ventilation device (5) and a device (8) for removing Sludge from the bioreactor (3), wherein - between a feed side primary clarifier (1) and the bioreactor (3) a pre-storage tank (2) for pre-treated wastewater with a conveyor (7) of known type for supplying the waste water to be cleaned in the bioreactor ( 3) is arranged; - The sludge storage in the primary clarifier (1) is integrated; - The bioreactor (3) contains about 50% of its useful volume carrier material (10); - The support material (10) has a density of 0.8 g / cm3 to 0.98 g / cm3 and both a physical and specific surface area between 200 m2 / m3 to 500 m2 / m3 bulk volume; - In the bioreactor (3) a safety device (9) is arranged in the form of a slotted tube whose openings are adapted to the geometry of the carrier material particles (10) that the carrier material (10) is retained in the clear water discharge; - The safety gear (9) is immersed in the bioreactor (3) up to half of the maximum usable working depth and is arranged so that it is flowed through in the ventilation phase, that a growth of their openings is excluded; - Within the safety gear (9) a conveyor of known type is arranged, which is connected to a outside of the bioreactor (3) located drain device (11); - The ventilation device (5) is a fine bubble, intermittently working ventilation device of known type.