SU812763A1 - Method of waste water purification in aniline-paint industry - Google Patents

Description

. I

The invention relates to the chemical and biological industry and can be used in the chemical industry at sewage treatment plants of enterprises and the dyes industry.

The closest in technical essence is a method of purifying wastewater from the aniline dye industry from workable organic compounds using activated sludge. The method involves physical and chemical treatment, followed by dilution of wastewater, mixing them with activated sludge under aeration conditions with correlation of wastewater activated sludge g 1: 9. Dilutions are carried out until the COD content is 1000 / l, which, for example, was 6ST 10 times, -CD after purification (residual) 170 mgOd / l, for discharge in accordance with MPC standards ,. in a flowing reservoir, the resulting water should be diluted with clean water, 10 times as the MPC standard corresponds to 17),

The disadvantage of this method is: the flow of runoff, which leads to increased water consumption for own needs and, as a result.

insufficient degree of wastewater treatment.

The purpose of the invention is to increase the degree of purification, reducing the use of water for own needs.

This goal is achieved by introducing microorganism biocenosis into wastewater. of the genera Pseudomonas and lus and maintain the mixture for 20-35 days before biological treatment. Preferably, the biocenosis of microorganisms and wastewater is taken in a ratio of 1: (5-30), and the wastewater is diluted in a ratio of 1: 1.

five

PRI me R. In 19 l of wastewater containing, mg / l: aniline 70.7, nitrobenzene 8.3, o-nitrophenol 0.9, naphthalene 27, p-fenithic 11.2, O-nitroanisole 27.2, P-nitroanisole 7 , 2, 0 P-NITROPHENOL 8.7, naphthol 0.4, diphenylamine 1, dimethylaniline 2.6, with COD 5500, enter 1 liter of biocenosis of the genera Pseudomonas and You And 1 us. After 32 days, the COD is 2,300 and

5 remains practically unchanged (1-2%). Then the mixture, wastewater, and biocenosis is pumped into the aeration tank, diluted with water (1: 1), and sparged with air for 16 hours at a rate of 30. The COD of the purified stock is 60 mgOl / L. Organic compounds in the residual water are absent. To determine the boundary values of dilution of the runoff from the biocenosis, the runoff is treated under the conditions described in Example 1, the incubation time is 32 days. The data presented by Jjeioi in the table. 1. In table. 2 shows the dependence of the chemical consumption of oxygen of purified water, and, consequently, the degree of purification on the residence time in the pond. .In tab. 3 shows the degree of purification of various organic impurities containing in wastewater.

COD of purified degree of purification, water,

370023

230058

302545

purified degree of purification, I%

14 21 32 62 80

Table 1

table 2

42 53 .58 59 59 As can be seen from the data, a decrease in the concentration of contaminants occurs by 58-100%. Thus, as a result of the proposed purification scheme, the quality of purified water is improved by a factor of 3 (since the COD end is reduced to 60 compared to the usual purification scheme — 170), while the use of water for dilution is reduced by a factor of 10, which makes it possible to use additionally industrial water for production needs and reduces water consumption from natural sources. In addition, as a result of a reduction in the amount of fluid in the aeration tank, the aeration period is reduced, which leads to energy savings.

Table 3

Claims (3)

Invention 1. A method for treating wastewater of an anion-paint industry from organic compounds, including dilution of waste water and biological treatment, from 1 and 1, and so that, in order to increase the degree of purification, reduce water use for own needs. , the biocenosis of microorganisms of the genera Pseudomonas and Baeillus is introduced into the wastewater and the mixture is kept for 20-35 days in the pond before biological treatment. 2. The method according to p. 1, about t l and h aa yu and and the fact that the biocenosis of microorganisms and sewage vrdy take in the ratio of 1: (5-30). 3. The way popp. 1 and 2, distinguishing from those that the waste water is diluted in a 1: 1 ratio. Sources of information taken into account during the examination 1. Reznichenko V.V., Livke V.A., Gotovna G.P., S.P., Fomenko S.A., Shapiro L. Makeeva E.V. Wastewater treatment plants; paint industry. Abstracts of the 6th Scientific and Technical Conference Prospects for the development of production and improvement of dyes, Rubezhnoye. 1975, October 22-23 Br.