Waste water process and appts. treats mixt. of activated and primary sludges

摘要

The novelty is that a waste water a treatment process and appts. treats de-watered sludge which consists of a mixt. of activated sludge from a settlement tank and prim. sludge. Further that the plant incorporates an anaerobically-operated acidification reactor, followed by an anaerobically-operated biogas reactor with the following features. (a) Protease, amylase, lipase, cellulase or mixts. thereof are introduced into the acidification reactor, (b) the acidification reactor is operated in the temp. range 20 to 70 deg.C. in a pH range of 3.5 to 6.5. (c) the temp. and the pH value are set in the ranges as stated (b) above, such that the acidified organic sludge contents introduced into the biogas reactor, contain at least 50% minerals; further that a carbon-based substrate consisting mainly of acetic acid is drawn off from the acidification reactor by means of a separator assembly, while the residue of the substance in introduced into the biogas reactor.