The way biochemical treatment of wastewater

 

(57) Abstract:

The method can be used for the purification of waste, geothermal and petroleum water containing organic substances such as phenols, humic substances and other, in the oil, gas and other industries. Waste water is served in a bioreactor filled with loaded with immobilized therein by microorganisms drives water and the adsorbent is granular activated carbon in the amount of 30 to 100 g/l of reactor volume. The temperature of the liquid 20 - 45oS. the Combination in a bioreactor adsorption and biological processes can improve the efficiency of cleaning, this simplifies the process and reduces the capital intensity. 1 C.p. f-crystals.

The invention relates to the field of wastewater treatment and can be used for the purification of waste, geothermal and petroleum water containing organic substances such as phenols and humic substances in the oil, gas and other industries.

The known method biochemical treatment of wastewater from phenols, based on deep cleaning on carbon filters by sorption on activated carbon and biological regeneration of microorganisms, the x water coming after biological treatment occurs after 12 o'clock

There is also known a method of biochemical treatment of wastewater from phenols [2], namely, that the sewage water is treated in aerobic conditions immobilizerturning thermophilic microorganisms drives waters and additionally carry out the purification activated carbon at a load of 1.6-2.1 mg by COD and 0.04-0.06 mg BOD per 1 g of coal per day.

The disadvantage of this method is the capital intensity and the presence of large production areas.

Closest to the proposed to the technical essence and the achieved result is a method of simultaneous adsorption and biological treatment of wastewater, which is achieved through the intensification of biochemical processes in the tank of activated sludge with additives of coal coke in an amount of 5 to 50 g/l [3].

The disadvantage of this method is the high capital and energy intensity due to the use in the tank of activated sludge.

The proposed method is that waste, geothermal and petroleum water containing organic substances such as phenols, humic substances, and others , served in a bioreactor, in which the biological is auctore adsorption and biological treatment, geothermal and petroleum waters on the proposed method improves the removal efficiency of BOD and 90%, phenol - 98-100%, humic substances - 70-92%, this simplifies the process and reduces 2 to 3 times the intensity.

The preparation of the bioreactor is carried out in two stages.

The first stage is the process of creating in the bioreactor immobilized aerobic microorganisms drives the source water. To this end bioreactor filled with load - steklorezami and source water works within 3-5 days in the recirculation mode.

The process of forming the biocenosis on stclaire controlled by parameters such as pH, BOD5, content of organic substances (phenols and humic substances). In the absence of treated water of organic substances, for example, phenols, humic substances, the bioreactor is transferred with recirculation at a flow mode and add fractional granular activated carbon in the amount of 30-100 g/l volume of the bioreactor.

In the bioreactor provides continuous air flow intensity 2-4 l/l volume of liquid, the cleaning is conducted at a temperature of 20 - 45oC.

During biochemical purification assumes saliani is drasti compressed air with a duration of 30-60 minutes

The proposed method of cleaning can improve the cleaning efficiency, simplify the process and reduce capital intensity.

Example 1. The cleaned waste water is subjected to, for example geothermal chloride-sodium type, mineralization of 7 g/l, the content of phenols 1-1,2 mg/l

The geothermal water purification from phenol is carried out in a laboratory bioreactor with a capacity of 2 liters, which fill stellaartois download of 10 - 15 g/l For immobilization of microorganisms on stellaartois loading bioreactor in the first 3 to 5 days working in the recirculation mode. In the absence of phenols in the purified water bioreactor is transferred to the flow-through mode with a speed of 4-5 volume of fluid per day and introduce granular activated carbon brand KAD-iodine, AG-3 in an amount of 100 g/l

Operating mode in the bioreactor is achieved within 3 days. When the temperature of the cleaned fluid 20-22oC and duration 3 h of treatment effect from phenols is 96,2% and at a temperature of 402oC allows complete utilization of phenols, i.e. 100% of the treatment effect.

Example 2. The cleaned waste water is subjected to, for example, geothermal chloride-hydrocarbonate-sodium type, mineralization of 2.1 g/l, content of the gum is Westley in a laboratory bioreactor with a capacity of 2 l, which fill stellaartois loading in the amount of 10-15 g/l and add granulated activated carbon brand KAD-iodine, AG-3 in an amount of 100 g/L. Introduction bioreactor operating mode is carried out by analogy with example 1. Assuming a reduction of 60-90% in the purified water, humic substances, the bioreactor is transferred to the flow-through mode.

When the temperature of the treated water 20-22oC and duration of 3 h, the cleaning effect from humic substances is 67%, and at a temperature of 402oC - 92%, while the treated water had no color and was transparent.

A significant difference of simultaneous adsorption and biological treatment in the bioreactor wastewater, for example, geothermal, is a high cleaning effect from humic substances and other organic contaminants, which is not achieved separate biological or adsorption treatment.

Thus, the proposed method of combining the bioreactor of adsorption and biological treatment of waste, geothermal and petroleum water allows to intensify the cleaning process due to controlled biomass of microorganisms on the download as numerous hairs "ruffs" stellaartois load, and the and microorganisms, and on charcoal - adsorption and biological degradation.

Sources of information taken into account in the preparation of the description:

1. Olfhof M. at al Biologicol treatment of Cokeoven waste water including provision for. Witrification, Jrou and Steel, Eug, 1980, T. 57, S. 54-60.

2. Auth. St. N 1766852, bull. N 37. 1992, Rybnikova Century. And., Zakiev M. I. Method biochemical treatment of wastewater from phenols.

3. Patent GDR N 272458, class C 02 F 3/12, 1989

1. The biochemical method of wastewater treatment, including the treatment of waste, geothermal and petroleum water immobilized aerobic microorganisms drives water and the adsorbent is activated carbon, wherein the treatment is carried out by combining biological and adsorption processes in the bioreactor at a liquid temperature of 20 to 45oWith a quantity of granulated activated carbon is 30 - 100 g/l volume of the bioreactor.

2. The method according to p. 1, characterized in that the processing is carried out at a liquid temperature of 40 2oC.

 

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