SU998393A1 - Process for treating effluent precipitates - Google Patents

Description

(5) METHOD FOR TREATMENT OF WASTEWATER DRAINS

one

The invention relates to sewage; it is intended for the complete processing of sludge produced at aeration stations;

There is a method of treating sludge, including the joint aerobic stabilization of raw sludge and unconsolidated activated sludge, followed by compaction, dehydration and drying G 1 T

The disadvantage of this method is the low Q q treatment efficiency.

The closest in technical essence and the achieved result is a method that includes joint aerobic stabilization of raw bca / J-j ka and activated sludge with heating, coagulation, compaction and dehydration "21.

The disadvantages of this method are the high maintenance costs of -20 and low sanitary conditions of implementation. The costs are due to the low compaction effect, which increases the volume of sediment.

supplied, for example, to drying, and using an expensive reagent. The second disadvantage is due to the evaporation of the heated sludge.

The purpose of the invention is to reduce operating costs and improve sanitary and hygienic conditions.

This goal is achieved by j that after the joint aerobic stabilization of the raw sludge and activated sludge, heating, coagulation, compaction and dehydration, the aerobic stabilized sludge is dried, the exhaust gases of the drying units are supplied to the aerobic stabilizer, the dried sludge is used as coagulum, and the vapor from the aerobic stabilizer is drained t in the furnaces of drying installations.

The dried precipitate is introduced into, -bch (x) bno-stabilized precipitate in a ratio (0.8: 1.0) - {1: 1) on a dry matter basis.

The method is carried out as follows.

Crude sludge and excess activated sludge is aerated in an aerobic stabilizer for 10–12 days and blown by the flue gases of drying plants, which contributes to the disintegration of the ash-free substance and the heating of the mixture. The stabilized sediment, whose temperature rises, is mixed with the coagulum and compacted by the gravity method; The compacted sludge is mechanically dehydrated and dried in a drying unit. The dried sludge is used as a coagulant, and the gases from the stabilizer are sent to the furnaces of the drying plants. Ratio the injected coagulant and dry matter sediment is

(0.8-1.0) - (1: 1).

Primer p. The mixture of raw sludge and excess activated sludge is stabilized for 10 days, heated, compacted with coagulant (ferric chloride) and dehydrated on vacuum filters according to a known method. Dehydrated sediment is dried. The volume of dried sediment 625 m / day at the initial humidity. Operating costs are on average 222.7 rubles / day (approximately 0.36 rubles / m per day). With a coagulant-sediment ratio (0.8: 1, 0) - (1: 1), the humidity of the sediment is reduced by 1.0-1.3%. which reduces the volume of sediment, respectively, by 12-31. With an average cost of 0, 3 rb / m, operating costs are reduced by r / day. The actual cost reduction is further increased by eliminating expensive reagent.

The use of the proposed method in comparison with the known with a daily performance of the aeration station of about 20.0 thousand, will provide the economic effect of thousands of rubles per year. In addition, the removal of vapors from the stabilizer to the firebox improves the sanitary and hygienic conditions of sludge treatment.

Claims (2)

1. A method for treating sewage sludge, which includes the joint aerobic stabilization of raw sludge and excess activated sludge, followed by heating, coagulation, compaction and dewatering of aerobic-stabilized sludge, characterized in that, in order to reduce operating costs, the dehydrated sludge is dried, the exhaust gases drying units are fed to an aerobic stabilizer, dried sludge is used as a coagulant, and vapors from the aerobic stabilizer are fed to the furnaces of drying units. 2. The method according to claim 1, wherein and with, the dried precipitate is introduced into an aerobically stabilized precipitate in a ratio of from 0.8: 1.0 to 1: 1. Sources of information taken into account in the examination 1.Turovsky I.S. Sewage sludge treatment. M., 1975, p. 2. USSR author's certificate number 403632, cl. C 02 F 11/00, 1971.