Treating method for gas production waste liquid with high content of sulfur

A waste liquid treatment, high-sulfur technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., can solve the problems of high treatment cost, non-standard discharge, complicated treatment process, etc. Achieve the effects of high treatment efficiency, standard discharge and simple operation

Inactive Publication Date: 2013-03-20
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

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Problems solved by technology

Wan Liping used coagulation-sodium hypochlorite oxidation-Fe / C micro-electrolysis-H 2 o 2 / Fe 2+ Catalytic oxidation-activated carbon adsorption treatment of fracturing waste fluid in an oilfield, the COD of the waste fluid was reduced from 12000mg / L to 140mg / L, and the water quality met the requirements of the Grade 2 standard in GB8978-1996, but the treatment cost was high, and the method was adjusted through follow-up research For pretreatment - chemical coagulation - Fe / C micro electrolysis - H 2 o 2 / Fe 2＋ Catalytic oxidation-activated carbon adsorption method, the treatment process of this method is complicated, the cost is high, and the water quality COD after treatment is> 100mg / L
Based on the above treatment methods, the COD of the main pollutant index of the treated wastewater is still greater than 100mg / L, which can only be reinjected into the formation and cannot be discharged up to the standard

Method used

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  • Treating method for gas production waste liquid with high content of sulfur
  • Treating method for gas production waste liquid with high content of sulfur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First add 800mL of gas extraction waste liquid into a 1000mL glass bottle with a cover, then add 0.2g of sodium hydroxide, tighten the bottle cap and oscillate to fully dissolve the sodium hydroxide; open the bottle cap to inject air into the waste liquid, control The gas flow rate is 0.7L / min, and the aeration time is 14h; Pour the aerated gas extraction waste liquid into a 1000mL beaker, add 2.4g of polyaluminum chloride, stir rapidly at 200r / min for 5min, adjust with milk of lime The pH value is 7.0, then add 16mL amphoteric polyacrylamide, stir slowly at 50r / min for 2min, filter; adjust the pH value of the filtrate after coagulation treatment to 4.5, add 16mL hydrogen peroxide and 0.08g ferrous sulfate and stir evenly , injected into the coal-based activated carbon adsorption column for filtration, the waste liquid stays in the adsorption column for 20min, and the COD of the filtrate is analyzed; the pH value of the filtrate after adsorption / Fenton oxidation is adjus...

Embodiment example 2-6

[0025] Table 1 Implementation Case 2-6 Best Process Conditions

[0026]

[0027] Table 2 Main pollutant indicators before and after treatment of gas extraction waste liquid (units are / mg.L except pH -1 )

[0028]

[0029] It can be seen from Table 2 that the gas recovery waste liquid has the characteristics of low pH, high COD, and high sulfide content. After being treated by this method, the COD of the waste liquid is reduced from the highest 23156mg / L to 78.2mg / L; the sulfide is reduced from 1142mg / L It has dropped to 0.52mg / L, and other major pollutant indicators have also reached the requirements of the first-level standard of the "Integrated Wastewater Discharge Standard". Moreover, the method has a safe treatment process, no pollution to the surrounding environment, a relatively simple treatment method, low cost, and stable water quality after treatment.

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Abstract

The invention discloses a treating method for gas production waste liquid with high content of sulfur, which belongs to technical field of treatment of waste water of the petroleum and natural gas industry. According to the method, the procedures of removal of hydrogen sulfide, aeration, coagulation treatment, adsorption / Fenton oxidation and deep oxidation are carried out, and after treatment, the indexes of main pollutants reach requirements of primary standard prescribed in Integrated Wastewater Discharge Standard GB 8978-1996. The method has the advantages of safe treating process, no pollution to surrounding environment, easiness and low cost, and stable water quality is obtained after treatment by using the method.

Description

technical field [0001] The invention relates to a treatment method for high-sulfur gas extraction waste liquid, which belongs to the harmless treatment technology used in the field of oil and gas field waste liquid treatment. Background technique [0002] my country's high-sulfur gas fields have the characteristics of deep gas reservoirs (nearly 5000m to 7000m), high temperature and high pressure in the formation, high acidity and high yield of produced gas, so exploration wells and development wells have many layers and long well sections, and acid fracturing working fluids are used Large volume, wide variety of additives. Since the formation contains a large amount of hydrogen sulfide gas, if it is discharged after the acid fracturing operation, it will cause harm to the surrounding people and the environment. Therefore, after the acid fracturing operation, the acid fracturing working fluid remains in the formation. In the initial stage of mining, the waste liquid produced...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/52C02F1/76
Inventor 马雅雅何焕杰詹适新袁华玉张鑫张淑侠杨云鹏
Owner CHINA PETROLEUM & CHEM CORP
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