Process for decreasing the pollutant content and for reducing the ammonium content and the COD and BOD5 values in composting waste water

摘要

A process is described for decreasing the pollutant content and reducing the ammonium content and the COD and BOD5 values in composting waste water, a) the composting waste water being separated off from solids, b) the waste water being freed of sludge and then being applied at least once from above onto a packing formed from composting biomass having a particle size 25 mm and percolating by the action of gravity between the packing particles and running off downwards, the waste water laden with sludge and solids being separated off from solids and sludge and some of the water volume being drained off, c) the exhaust air from the composting, to achieve aerobic fermentation, being run as an air stream through the packing from bottom to top in accordance with process stage (b) and the waste water being adjusted to a temperature of 25 DEG C to 35 DEG C by the exhaust air, d) the exhaust air from the clean-up in accordance with process stage (b) being cleaned in a biofilter and discharged to the surroundings.