FIELD: chemistry.
SUBSTANCE: group of inventions relates to biological treatment of sewage sludge. The method of treating sludge involves mixing sludge, enzymatic treatment, decontamination, drying and conditioning the obtained biomass, wherein the sludge used is a mixture of deposited sludge and pre-treated excess sludge. Pre-treatment involves conversion of excess sludge into an active enzymatic mass by saturating with atmospheric oxygen to concentration of not less than 10 mg/l, air-cavitational and electrochemical treatment using a galvanic pair while feeding intermittent alternating current through the excess sludge pumped into a pressure pipe. The apparatus for treating sludge comprises the following, connected by pipes: a sludge container 1, an intermediate container 5, a drying system, a pump 7, an activator 10 placed in a reactor-balancing tank 11, a device for reducing cavitation 6 placed in front of the pump 7 on the pressure pipe 8 which connects the intermediate container 5 and the activator 10, wherein the reactor-balancing tank acts as a dispensing apparatus. The activator 10 has a chamber for mixing media, having excess sludge and air inlets which are linked to the chamber of an electrochemical coagulator lying on the same axis as itself, wherein the chamber for mixing media is in form of a housing consisting of a cylindrical part and four conical parts; inside the housing on guides there is a cowling, having a cylindrical part and two conical parts; the excess sludge inlet is in form of a conical funnel and flow guides at a tangent to the cylindrical surface of the cowling of the apparatus; the air inlet is in form of a pipe located in the conical part of the housing, lying on the opposite side of the outlet of the treated mass from the cowling, and the converging and diverging conical parts of the housing which act as an electrochemical coagulator, lying at the outlet of the cowling, respectively, are fitted with multi-turn bimetallic spirals which are separated by dielectric spacer plates in form of rings placed between connecting flanges.
EFFECT: low cost of treating deposited sludge and providing high efficiency of treatment from heavy metals.
5 cl, 6 dwg, 1 tbl, 7 ex
