SU1174388A1 - Method of biochemical removing of methanol and hydrocarbons from sewage - Google Patents

Abstract

1. METHOD OF BIOCHEMICAL TREATMENT OF WASTEWATER FROM METHANOL ICECOroSRf.f 13. ; 8h2 AND HYDROCARBONS, characterized in that, in order to be able to purify wastewater with high salinity, reduce freshwater consumption for dilution and reduce capital costs, from 5 to 30% of highly mineralized wastewater is diluted with fresh water; mineralization 20–40 g / l, the biomass of activated sludge is 40–70 h grown in diluted waste water, the resulting suspension is mixed with highly mineralized waste water and kept under stirring and aeration 40S 120 h. tl and h ay u u and so that in diluted Inorganic salts of nitrogen and phosphorus are introduced in the amount of 2-10 g / l. . iliik CO 00 00

Description

The invention relates to methods for the biochemical purification of highly mineralized wastewater from methanol, hydrocarbons and dysglycol, and can be used in gas, oil and chemical industries. The purpose of the invention is the possibility of treating wastewater with high salinity, reducing the consumption of fresh water for dilution and reducing capital costs. Example 1. A stream of effluent (pH 6-7, temperature 30 ° C) with a methanol content of 20 g / l and a salinity of 100 g of sodium chloride per 1 liter is divided into two parts, respectively 80 and 20% of the initial volume of waste water water. 8 liters of fresh water are added to 2 liters of waste water so that the concentration of sodium chloride does not exceed 20 g / l. To this solution, 10 g of ammophos and 1 suspension of activated sludge grown on waste water with a sodium chloride content of 20 g / l and methanol 4 g / l are added for 40 hours. The diluted waste water with activated sludge is maintained at 20 ° C, and also with stirring and air supply of 0.5 l per 1 liter of liquid per minute until complete disappearance of methanol, which occurs after 42 hours. The final concentration of active sludge is 1.5 g of raw biomass per liter. After that, 10 liters of diluted standing water with grown activated sludge is mixed with 8 liters of undiluted waste water and held with stirring and air supply of 0.5 liters per 1 liter of liquid per minute, until complete disappearance of methanol, which occurs after 110 hours. The concentration of active sludge is 0.70 g of raw biomass per liter. The concentration of active sludge after 60-hour exposure in highly mineralized wastewater does not increase and amounts to 0.25 g of raw biomass per liter by the time of the disappearance of methanol. Thus, in highly mineralized wastewater, the recovery of the biomass of activated sludge does not occur and even dying and decay is observed. . The flow of fresh water per diluted is 80% of the volume of waste water, and to dilute the entire volume of waste water before salinization of 20 g / l, which effectively cleans the waste water by a known method, fresh water is necessary in a quantity of 400% of the volume waste water. Example 2. Similar experiments were carried out with chlorine-calcium type wastewater. 10. L of wastewater (pH 6-7, temperature with a methanol content of 20 g / l and mineralization of 100 g of calcium chloride per 1 liter is divided into two parts, respectively 80 and 20% of the initial volume of wastewater. K 2 l 8 liters of fresh water is added to the waste water. So that the calcium chloride concentration does not exceed 20 g / l. 10 g of ammonium phosphate and 1 l of a suspension of activated sludge grown on waste water with calcium chloride content of 20 g / l are added to this solution and methanol 4 g / l for 70 hours. Diluted waste water with activated sludge is kept in chemical Bone fermenter with mechanical agitation and air supply of 0.5 l per 1 liter of liquid per minute and a temperature of 30 ° C until complete disappearance of methanol, which occurs after 42 hours. The final concentration of activated sludge is 1.5 g of raw biomass per liter. Thereafter, 10 liters of diluted waste water. 1 With grown sludge is mixed with 8 liters of undiluted waste water and kept under stirring and air supply at 0.5 liters per 1 liter of liquid per minute until complete disappearance of methanol, which occurs after 60 hours. activated sludge concentration put 0.70 g of crude biomass per 1 liter. The concentration of activated sludge after soaking in highly mineralized wastewater does not increase and amounts to 0.35 g of raw biomass per liter by the time of the disappearance of methanol. Freshwater flow, as in Example 1, is 80% of the volume of wastewater. Example 3, Yul effluent of high salinity (80 g / l sodium chloride and 80 g / l calcium chloride) containing, g / l: methanol 4j diethylene glycol 1; Hex3 Sadekan 1, is divided into two parts, constituting, respectively, 90 and 10% of the initial volume of wastewater. To 1 l of waste water are added 7 l of fresh water, 8 g of ammophos, 32 g of methanol and 0.8 g of a suspension of activated sludge grown on waste water with a salinity of 40 g / l and containing methanol (4 g / l), diethylene glycol ( 0.1 g / l) and hexadecane (0.1 g / l). After dilution, addition of methanol and activated sludge, standing water is maintained under conditions of mechanical stirring and air supply in an amount of 0.5 l per 1 l of liquid per minute at a temperature until complete disappearance of diethylene glycol, hexadecane and methanol, which occurs after 70 hours The concentration of activated sludge at the time of the disappearance of these substances from waste water is 3 g of raw biomass per liter. After that, 8 liters of diluted standing water with activated sludge is mixed with 9 liters of undiluted wastewater with a salinity of 160 g / l and maintained at, as well as with stirring and air supply in an amount of 0.5 liters per 1 liter of liquid per m , until complete disappearance of diethylglycol, hexadecane and methanol, which occurs after 70 hours. The freshwater consumption for dilution is 70% of the volume of wastewater, and dp is the total volume of wastewater before mineralization of 20 g / l, at which the wastewater is effectively cleaned water by the famous benefits, requires consumption of fresh water in an amount of 800% of the volume of waste water. Example 4. The flow of waste water with a mineral salt content of 300 g / l (potassium chloride 75 g / l sodium chloride 75 g / l, magnesium chloride 135 g / l, calcium chloride 15 g / l) containing 4 g / l methanol g / l diethylene glycol and 1 g / l liquid paraffins, continuously divided into two parts, respectively 20 and 80% of the flow of flowing water at a rate of 100 ml / h, a smaller stream of water (20 ml / hJ mixed with fresh water, 9 times the 1m stream of waste water (180 ml / h. 84 Fresh water contains I g / l ammophos and 4 g / l methanol. Diluted waste water and water continuously enters the fermenter with a working volume of 10 liters, where the biomass of activated sludge is grown under mechanical agitation and an air supply of 0.5 liters per 1 liter of liquid per minute and temperature. Before conducting the continuous growth of biomass of activated sludge, biomass is grown in the fermenter without duct on diluted 10 times the wastewater with the addition of 1 g / l of ammophos and 4 g / l of methanol. The seed material is the biomass of microorganisms separated from the soil in contact with industrial wastewater from underground gas storage facilities, and actively growing down the mixing of wastewater before mineralization 20 g / l and the addition of 1 g / l ammophos. Continuous cultivation of biomass of activated sludge on diluted wastewater leads to complete disappearance of non-e methanol, diethylene glycol and hydrocarbons with the residence time of the waste water in the fermenter for 50 hours, i.e. at a dilution rate of 0.02 hours. A slurry of activated sludge grown in a fermenter (200 ml / h is continuously mixed with a stream of undiluted wastewater (80 l / h) in a fermenter with a working volume of 28 liters with mechanical agitation, an air flow of 3 liters per 1 liter liquids per minute and a temperature of 30 ° C. The complete disappearance of methanol, diethylene glycol and hydrocarbons from waste water occurs at a fermenter residence time of 100 h (i.e., at a dilution rate of 0.01 h). This example is 180% of the volume of waste in odes, and to dilute the total volume of waste water to a salinity of 20 g / l, which effectively cleans the waste water by a known method, a fresh water flow rate of 1400% of the volume of waste water is required, Table 1 shows the purification process indicators of 1000 m wastewater at different modes of its dilution.Table 2 shows the effect of the growing duration of the biomass of activated sludge and the time the sludge is kept on the sludge on the treatment of 1000 wastewater BofjJ.

Table 1

The well-known method The proposed method 3 5 10 20 35070 70070 140060 Non-compliant Compliant compliance (reduced freshwater consumption by 80%, capital expenditure by 70%; Compliant reduced flow of fresh water by 70%, capital expenditure by 60%). Non-compliant (reduction of fresh water consumption by 60%, capital expenditures by 52%; Non-compliant (reduction of fresh water consumption by 50%, capital expenditures - by 44%)

Time vyderivavivababiomassy living stoch diluted water from the waste warmer to complete cleaning, h

140

20

120

thirty

120

40

T b l n c a 2

Matching Goals

Non-compliant (capital cost reduction is less than 57%;

Does not correspond (reduction of capital costs is less than 60% J

Corresponds to a reduction in capital costs of 60%)

Claims (2)

1. METHOD OF BIOCHEMICAL WATER TREATMENT FROM METHANOL AND HYDROCARBONS, characterized in that, in order to be able to purify wastewater with high salinity, reduce the consumption of fresh water for dilution and reduce rats, from 5 to 30% of wastewater fresh water to a capital of high minerals is diluted with mineralization 20-40 g / l, biomass of activated sludge is grown in diluted wastewater for 40-70 hours, the suspension obtained is mixed with highly mineralized wastewater and kept under stirring and aeration for 40120 hours. 2. The method according to π. 1, characterized in that inorganic salts of nitrogen and phosphorus are introduced into diluted wastewater in an amount 2-10 g / l. -. SU, „. 1174388