SU1724599A1 - Method of biochemical treatment of sewage - Google Patents

Abstract

The invention relates to the treatment of water, can be used in the treatment of household sewage in aerofoil and allows an increase in the degree of purification. Biochemical purification is carried out in an aerotank with activated sludge in the presence of a neutralized lime pickling solution containing iron hydroxide and coke production of cold rolled products containing magnesium oxide mixed in a ratio providing the content of ferric hydroxide and magnesium oxide, g / l as a coagulant; 0.07–0.30 and 0.07–0.22, respectively. The method makes it possible to increase the degree of purification by COD by 2.4%, BOD - by 1%, phosphate - by 20.6%, ammonium nitrogen - by 24.2% and recycle waste. 2 tab.

Description

The invention relates to the treatment of water and can be used in the treatment of household sewage in aerosols.

The aim of the invention is to increase the degree of purification.

For carrying out the process, the wastewater is subjected to biochemical purification with activated sludge in the aeration tank in the presence of coagulant, which is neutralized with lime pickling solution and cold rolled products production waste, mixed in a ratio that provides iron content (Fe (OH) h) and magnesium (MgO ), g / l: 0.07-0.30 and 0.07-0.22, respectively.

Iron hydroxide is formed by neutralizing lime with pickling solutions.

Magnesium oxide is part of the production waste from cold rolled products shops.

When wastewater is mixed, magnesia hydrolyzes to form an association of complex molecules:

(MgO) m + n + mH20- (MgO) (OH).

This forms a complex, positively charged micelle, surrounded by ions

{(OH) (OH) x (xp) OH-} n + + PON.

In the presence of iron hydroxide, the compounds formed increase the efficiency of wastewater treatment in aeration tanks.

Example. Purification is subjected to wastewater of the following composition, mg / l: COD 382; BOD 264; phosphates (Р043) 15.0; nitrogen (NH44) 12.8. Neutral VJ is fed into the wastewater stream.

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lime pickling solution and production waste of cold rolled products, mixed in a ratio that provides the content of Re (OH) s and MgO, g / l: 0.22 and 0.15, respectively. The purification is carried out in an aero-tank in the presence of activated sludge in the amount of 1.13 g / l. The treated wastewater is characterized by the following indicators, g / l: COD 26; phosphates (PO-g) 0.9; nitrogen (NH4) 3.1.

Table 1 presents data on the effectiveness of wastewater treatment, depending on the content of iron hydroxide and magnesium oxide in the mixed stock.

Table 2 presents data on the effectiveness of wastewater treatment by the proposed method in comparison with the prototype and biochemical treatment in the absence of coagulant.

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Claims (1)

Using the proposed method allows to increase the degree of purification by COD by 2.4%, MIC by 1.0%. phosphates by 20.6%, ammonium nitrogen by 24.2% and utilize waste. DETAILED DESCRIPTION OF THE INVENTION A method for biochemical treatment of wastewater, which includes treatment in an aerotank with activated sludge in the presence of coagulant, in that, in order to increase the degree of purification, a neutralized lime pickling solution containing ferric hydroxide is used as a coagulant. workshops cold rolled, containing magnesium oxide, mixed in a ratio that provides the content of iron hydroxide and magnesium oxide 0.07-0.30 and 0.07-0.22 g / l, respectively. thirty Table Table 2