The way biochemical treatment of wastewater from organic substances

 

(57) Abstract:

The invention relates to the field of biochemical treatment of industrial and municipal and industrial wastewaters containing impurities of different nature, and can be used at municipal wastewater treatment plants, petrochemical, pharmaceutical, textile and chemical industries complex. A method is proposed biochemical treatment of wastewater from organic substances, including biological treatment activated sludge in the presence of a binary mixture phthaloylglycine and high-molecular compounds, high molecular compounds binary mixtures take polyelectrolyte water-soluble cationic (VPK-402) in the ratio of 4:1, respectively, and optionally enter a binary mixture phthaloylglycine and polyelectrolyte water-soluble cationic (VPK-402) after biological treatment in the ratio of 1:3 respectively. The mixture FG and VPK-402 is introduced into the waste water before the aeration tank in the amount of 0.0001-0,0007% by weight of treated wastewater. The mixture FG and VPK-402 is introduced into the waste water at the stage of secondary sedimentation sludge suspension in the amount of 0.0005-0,0015% by weight of treated wastewater. The proposed method is compared with the prototype allowed is 20%, suspended and colloidal substances by 6-10%, and the pretreatment of the sludge suspension polycomplexes reagent significantly reduces the sludge index: 46% compared with 8 and 21% in the case of using individual reagents, respectively FG and VPK-402. 2 C.p. f-crystals, 3 tables.

The invention relates to the field of biochemical treatment of industrial and municipal and industrial wastewaters containing impurities of different nature, and can be used at municipal wastewater treatment plants, petrochemical, pharmaceutical, textile and chemical industries complex.

There is a method of biological wastewater treatment activated sludge (Drainage systems of industrial enterprises/ S. C. Yakovlev, I. A. Karelin, Y. M. Tender, Y. C. ravens. - M.: Stroiizdat, 1990. - S. 511), the disadvantages which include high sensitivity to toxicants and difficultly oxidizable substances by the variability of the composition of the wastewater, which significantly reduces the efficiency of the biodegradation of chemical contamination.

Pretreatment of wastewater polycomplexes reagent on the basis of the modified gelatin and proxanol is chosen (patent 2026827 RF, MKI C 02 F 3/02. The way biochemical purification of waste which is the inability to achieve a high degree of wastewater treatment for a number of xenobiotics: synthetic surface-active substances, suspended and colloidal impurities of different nature.

The objective of the invention is to improve the level of wastewater treatment and improvement of the sedimentation properties of activated sludge.

The problem is solved using the method of biochemical treatment of wastewater from organic substances, including biological treatment with activated sludge. For this wastewater before biological treatment is administered binary composition comprising phthaloylglycine (Fi) with molecular weight of 105unit and the water-soluble polyelectrolyte cationic (VPK-402) with a molecular mass of elementary link of 161.7 at a ratio of 4:1 and to increase the efficiency of the deposition process the sludge suspension in the node of the secondary settling add binary composition above the Navy in the ratio of 1:3.

The mixture FG and VPK-402 enter in the amount of 0.0001-0,0007% and 0.0005-0,0015% by weight of treated wastewater, respectively, before the aeration tank and the secondary node advocate.

Sharing phthaloylglycine and VPK-402 in the ratio of 4:1 leads to the formation of polymer-polymer complex, which is the large size of macromolecules and high content of reactive functionality is od.

In the case of binary compositions PG:VPK-402 composition 1:3 reduction of sludge index is explained by the formation polycomplexes flocculant with a higher molecular weight and effective positive charge, contributing to the aggregation of oppositely charged particles of activated sludge and macromolecules of complex reagent.

Fi is a yellow powder, soluble in water, is a product of the interaction of gelatin with phthalic anhydride with various degrees of substitution of the amine groups in the protein molecules; molecular weight PI equal to 105unit Product is non-toxic, stable during storage (TU 6-17-893-83). Modified gelatin).

VPK-402 is obtained by polymerization of the monomer dimethyldiallylammonium chloride. In experiments using VPK-402 with a molecular mass of unit cell of 161.7. The composition of the elementary level (C8H16)nCl. Polyelectrolyte VPK-402 infinitely soluble in water, lower alcohols, dilute acids and alkalis (TU 6-05-2009-86. Polyacrilic water-soluble cationic brand VPK-402).

The method is as follows.

In industrial and domestic effluent entering the aeration tank for biological treatment activated sludge, BB runoff is subjected to biological treatment with activated sludge.

To improve the efficiency of deposition of the sludge suspension in the secondary clarifiers and the quality of wastewater treatment for suspended solids is proposed introduction prostok, past the aeration tanks, pre-mixed 1% solution phthaloylglycine and MIC in the amount of 0.0005-0,0015% of the mass flow, which is then subjected to precipitation.

To compare the effectiveness of effluent recycling and separation of activated sludge by the proposed method are conducting a series of experiments with different ratios phthaloylglycine and the military industrial complex and different number of input mixture, respectively, for the process of bioremediation: 1:1, 2:1, 3:1, 4:1, 5:1 when the content of the reagent to 0.0001 0,0003, of 0.0004, 0,0007, about 0.001 wt.% and for the deposition process: 1:1, 1:2, 1:3, 1:4, 1:5 when the content of the reagent of 0.0005, 0.001 in, 0,0015 wt.%.

Example 1. In industrial effluent with COD 849 mg/l solids content of 96 mg/l, and Spasov to 10.6 mg/l add 1% solution of a mixture of phthaloylglycine and PBS in the ratio of 4:1 to a concentration of 0,0007 wt. % in the treated water. The thus treated waste water flows into the model tank capacity 10 l, which is an industrial activated sludge. Duration of treatment 24 h, the concentration rastvorennogo the full experience).

The flow past the cleanup has the following options: in the control experiment - COD - 127 mg/l, the content of Spasov - to 2.65 mg/l suspended solids - to 16.4 mg/l, in the modeling experience - COD - 69,6 mg/l, the content of Spasov - 1.3 mg/l, suspended solids and 5.8 mg/l, Respectively, the degree of purification by COD 85% and 91.8%, Spavam 75 and 87.7%, suspended solids 82,9 and 93.9 per cent.

Similar test with different ratios of mixture components and the quantities introduced into the waste water binary reagent. Given the variability of the composition of real industrial runoff, the results obtained are average, and the comparison of the averaged experimental data is conducted according to the magnitude of the treatment efficiency of prostata (option b).

The parameter b is calculated as the ratio of the difference between values of the corresponding index of the pure flow in the control and model experiments to the value of the indicator in the control and model experiments to the value of the indicator in the control experiment.

Experimental results on industrial wastewater treatment for suspended solids and Spawn are given in table. 1.

The results of comparison of the effectiveness of treatment of industrial wastewater for the proposed method and the prototype prietki industrial wastewater concentration of the mixture phthaloylglycine and MIC flow 0,0007 wt.% when the mixing ratio 4:1, respectively, in which are formed a more robust and effective systems.

As can be seen from the table. 2, the proposed method is compared with the prototype (patent 2026827 RF, MKI C 02 F 3/02. The way biochemical treatment of wastewater from organic substances) allows to increase the efficiency of a number of important xenobiotics discharge: (Spave - to 30 - 35%, phenols by 18 - 20%, suspended and colloidal substances by 6 - 10%.

Example 2. In the sludge suspension was added 1% solution of a mixture of phthaloylglycine and military-industrial complex in the ratio 1:3 to a concentration of 0.001 wt.%. Thus treated activated sludge is supplied to the secondary settling tank with a capacity of 7 liters Duration of the settling sludge suspension is 2 o'clock

Parallel conduct tests in the presence of MIC and without adding binary reagent (control experiment).

After settling determine the amount of silt index (Method for process monitoring of sewage treatment plants municipal sewer. - M.: Stroiizdat, 1977. - 209 C.).

Similar test with different compositions and amounts of binary flocculant injected into the sludge suspension.

The results of the experiment are given in table. 3.

the military reduces the sludge index: 46% compared with 8 and 21%, in the case of using individual reagents, respectively FG and MIC.

1. The way biochemical treatment of wastewater from organic substances, including biological treatment activated sludge in the presence of a binary mixture phthaloylglycine (Fi) and high-molecular compounds, characterized in that the high molecular compounds binary mixtures take polyelectrolyte water-soluble cationic VPK-402 in the ratio of 4:1, respectively, and optionally enter a binary mixture phthaloylglycine and polyelectrolyte water-soluble cationic VPK-402 after biological treatment in the ratio of 1:3, respectively.

2. The method according to p. 1, characterized in that the mixture FG and VPK-402 is introduced into the waste water before the aeration tank in the amount of 0.0001-0,0007% by weight of treated wastewater.

3. The method according to p. 1, characterized in that the mixture FG and VPK-402 is introduced into the waste water at the stage of secondary sedimentation sludge suspension in the amount of 0.0005-0,0015% by weight of treated wastewater.

 

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