SU1231010A1 - Method of biological purification of concentrated waste water from organic compounds - Google Patents

Description

The invention relates to the biological treatment of industrial wastewater with a high concentration of biologically oxidizable organic compounds and can be used to purify concentrated wastewater from organic synthesis plants in other industrial areas.

The purpose of the invention is to increase the productivity of wastewater treatment plants by improving the structural and chemical properties of activated sludge,

The method is carried out as follows.

The strain of Mycobacterium lacticolum is cultivated on the medium of the following composition, g / l: (NH4) 2S04 1.0; MgSO. 0.5; NaCl 0.25; ZnS04, ShZO and FeCLj 0,002; KjHPO 0.55; 0.27. The waste water to be treated is added to the medium in an amount corresponding to a COD of 2 g / l. The optimum pH is 74, -7.6. Growth | Cultures are stimulated by the addition of one or two of the following components: aliphatic alcohols (including ethanol and glycerin); sugar (or waste sugar production - Melassa); aliphatic and aromatic acids (mono-, DI-, tricarboxylic), wort, peptone, aliphatic hydrocarbons in an amount of at least 2 g / l. The medium is inoculated with M, lacticolum and activated sludge cells at a ratio of their biomass (dry weight) of 100: 1. Cultivation is carried out on a rocking chair at 30-33 ° C for 2-3 days. The cell mass is introduced into the treatment plant, not separating it from the culture fluid, in an amount of 1.5-2% of the dry weight of the activated sludge. In plants operating with the return of activated sludge, the biomass of the strain is applied without stopping the supply of wastewater. In the case of intensive eye structures

sewage effluents operating without return water j 10,000 mg / l and period

24 hours aeration. The cleaning condition is monitored every 4 days of the aeration tank operation. The application of the proposed method in the column type aero tank, where the content of dissolved oxygen is 7.9 mg / l, allows the purification of wastewater from the MIC 10,000 mg / l at optimal aeration period of 24 hours, in one stage.

After entering the strain, the gate of microorganisms is stopped for 4–10 h, after which the duct is resumed and cleaning is continued.

 The results of the cultivation of the strain and activated sludge are presented in Table.

PR and meR 1. A 138 mg of biomass of the strain is introduced into the laboratory aerotank-mixer that cleans the waste water of the organic synthesis production (the main contaminants are organic acids and acetic acid), which is 2% of total activated sludge. Pre-receive biomass as above

MIC treated wastewater increase from 1000 to 2500 mg / l. Control over the cleaning process is carried out after 5 days from the start of operation of the aeration tank. Wastewater treatment with the military industrial complex 2000,

2300, 2500 mg / l with a period of aeration of 18-24 h is carried out at 98.4-99%; oxidative power is in the range of 2269-2970 g / m. day /

Thus, the proposed method allows to increase the oxidizing power in a traditional aeration tank by 2.9 times; the concentration of treated wastewater 1.5 times. At the same time, for cleaning 1 m of runoff from the military industrial complex 2500, g / m, the volume of facilities is -l-. 0.7 m, which is 7.2 times

2970

 less compared with the known method. The stability of the sludge index, which does not exceed 140 mg / l, indicates the effectiveness of the effect on the structure and sedimentation properties of activated sludge using the proposed method. Thanks to this, no sludge particles in the form of B31 substances are removed; the cleaning effect is 99.0%.

Example 2, 200 ml of culture fluid containing 568 mg of biomass of the strain obtained as indicated above, which accounts for 2.0% of the total biomass, are introduced into a laboratory aero jug of the column type. The flow of waste water in the aeration tank is stopped for 8 hours, after which the facility works on the duct at the military industrial complex

purified water 10,000 mg / l and period

24 hours aeration. The state of cleaning is monitored every 4 days of the aerotank operation. The application of the proposed method in the column type aerotank, where the content of dissolved oxygen is 7.9 mg / l, allows the purification of wastewater with VPK 10,000 mg / l at optimum aeration period of 24 hours, in one stage.

Comparative data are presented in Table 2 and 3.

Mycobacteriim

lacticolum

 Mycobacterium

MIC peon purified water, mg / l

Suspended solids in purified water, m / l

82

68

Sludge volume (Z) after settling, min:

Note. The analysis of indicators was carried out after 10 days of the system operation under the specified mode.

:Table 2

2500

9800

35

26.5

Bacteriap-74 on suspension

E table

Claims (3)

1. METHOD FOR BIOLOGICAL CLEANING OF CONCENTRATED WASTE WATERS; 0T ORGANIC COMPOUNDS, including treatment with activated sludge in aeration tank, characterized in that, in order to increase the productivity of treatment facilities by improving the structural and sedimentation properties of activated sludge, they are introduced into activated sludge into activated sludge bfycobacterium lacticolum, which is pre-cultured with activated sludge in the presence of treated wastewater. 2. The method according to π. I, the fact that the strain Mycobacterium lacticolum is administered in an amount of 1.5-2.0% of the dry weight of activated sludge. 3. The method according to PP. 1 and 2, characterized in that the strain of Jfycobacterium lacticolum is cultured at a ratio of the biomass of the strain and AK -. activated sludge in the inoculum 100: 1. Dioiezr ^......