SU1006394A1 - Method for treating effluent precipitate - Google Patents

Description

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The invention relates to processing. KB of sewage sludge and can be used to thicken the sludge formed during the biological treatment of municipal sewage.

The known method of thickening the sediment consists in its gravitational compaction. C J The disadvantage of the method is that the concentration of the thick sediment is insignificant 30-35 g / l.

The known method of flotation concentration of excess activated sludge to a concentration of 0-60 g / l by heating it to 50-95 ° C, followed by mixing with a liquid saturated with an overpressure with air 2.

The disadvantages of the method are the significant economic costs of heating the precipitate and saturating it with air at an overpressure, the need to use special hermetic equipment to mix the precipitate with water saturated with air, poor quality of sludge water, suspended solids content up to 1000 mg / l.

The known method of thickening the sediment consists in flotation of the solid phase of the sediment by introducing bicarbonate or ammonium carbonate into the sediment and heating the mixture (60-70 s) until the gas bubbles 3 are released.

The disadvantages of the method: significant costs for heating the sediment (about 50 COP / m); the need to use special equipment; rise the filtration resistivity of the condensed sediment is heated when the scientific research institute is heated, i.e. deterioration of its subsequent dehydration; poor quality, sludge water; significant consumption of reagent carbon dioxide (and ammonia - 35 kg per 1000 kg of dry sludge (or about 700 mg / l sediment); large ammonia losses during thermal decomposition of ammonium carbonate. The closest in technical limb and the achieved result is the method of sludge treatment accurate water by introducing sulphate or chloride to iron with subsequent lack of moisture in the sludge areas of Z. At the same time, the load on sludge areas increases by a factor of 2-3. The dose of agents is 1% by weight of dry matter of chlorine iron and 3 , 3-23,3 wed l su fata iron.

These chemicals are introduced to bring the pH of the precipitate to, i.e. to a value corresponding to the isoelectric point (zero charge) of the protein S substances at which the particles of the sediment coagulate.

The cost of processing 1m, for example when combining ferric chloride with lime 3.2 kopecks.

0 The disadvantage of this method is that compacted at the bottom. Sludge pad sediment creates additional resistance to filtering the sludge fluid through the drainage system 5 (fiecoK, gravel) and reduces the productivity of the sludge pad.

The aim of the invention is to increase the productivity of the sludge bed. 0 The goal is reached

By subjecting the sewage sludge to aerobic stabilization, ammonium nitrate is introduced and dehydrated in sludge beds, ammonium nitrate is introduced preferably in the amount of 100150 mg / l.

The method is carried out as follows.

Ammonium nitrate in the amount of 100-150 mg / l is introduced into the aerobic-stabilized sediment at the outlet of the aerobic stabilizer and fed to the sludge: ground. Under the aerobic conditions, a biological sludge bed occurs (the biological process of denitricification of the nitrate compound, i.e. ammonium nitrate, introduced into the sediment.

The process is spontaneously carried out by denitrifying bacteria included in the composition of the bacterial flora of the sediment, and is accompanied by intensive nitrogen evolution of gas. Providing flotation and thickening of particles. The sediment volume decreases by a factor of 5-6. Its concentration is 50-80 g / L. Under the packed sediment layer, there is pure sludge water containing 6-10 mg / l of suspended solids.

After completion of the compaction process, the drainage is opened and the clear sludge water is filtered through the drainage. The thickened sediment sinks to the bottom of the pad and dries quickly, as it has a good structure due to the large number of pores formed by the gas bubbles.

3 100639 4.

One cycle of the working area from the mine is Example 2. In the aerobilization of the load prior to unloading, the dry sediment is injected 100 Ng / l.

the sediment is no more than 1, yen tsa.nitra ayoni, and is fed to the dewatering capacity equal to 8–10 living per sludge bed. It is produced for a year at a height of 1, 0–1.5 m. The water content is 8–10 and / or.

Reduction of ayoni nitrate dose per year. ..

does not increase productivity. The proposed method allows to increase.

sludge PLO11 (adki, increasing the dose while reducing the productivity of sludge

leads to an increase in expenditures. in k-S times, i.e. compared

PRI and e. P 1. In aerobically with a known method, more in; The precipitate is injected nitrate once and reaches 8–10 per year. IONIA in the amount of 50 Ug / l and serves at a rate of 4 times less. Crohn dehydration in the silt area, in addition, biogenic sediment is introduced into the sediment. The productivity of its composition is an Elbent nitrogen in the form of the NC ion, it will increase 5 th / y per year .. the fertilizing properties of the sludge.

Claims (2)

1. METHOD OF TREATMENT OF WASTE WATER DRAINAGE, including the introduction of a chemical reagent followed by dehydration at sludge sites * characterized in that, in order to increase the Sludge Productivity *, the sewage sludge is preliminarily subjected to aerobic stabilization, and nitrate is used as a chemical reagent. ammonium 2. The method of pop. 1, characterized in that the ammonium nitrate is administered in an amount of 100-150 mg / L. SU, „, 1006394 1 1006394 2