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Oil and gas field wastewater treatment process

A wastewater treatment, oil and gas field technology, applied in mining wastewater treatment, water/sewage treatment, flotation water/sewage treatment, etc., can solve the problems of increasing wastewater treatment difficulty, difficult treatment, interference, etc., to eliminate confrontation effects and improve treatment The effect, the effect of simple processing technology

Active Publication Date: 2018-04-20
CHONGQING VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially oil and gas field wastewater containing chloride ions can be as high as 30,000 mg / l, which has caused serious interference and impact on mercury removal and organic pollutant removal processes
Mercury removal, removal of organic pollutants and high chloride ions are intertwined, interfering, restricting and influencing each other, which greatly increases the difficulty of wastewater treatment. Therefore, the treatment of mercury-containing oil and gas field wastewater is a major problem at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The raw materials of the composite flocculant in this example include the following components in parts by weight: 10 parts of polydimethyldiallyl ammonium chloride, 5 parts of polyaspartic acid, 8 parts of modified polyacrylamide, bis-dithio 5 parts of chitosan grafted with carbamic acid, 1 part of hexadecyltrimethylammonium bromide, 3 parts of nanoscale iron filings, 3 parts of methanol, 3 parts of sodium bentonite, 4 parts of SA630 heavy metal collector, polymerized 3 parts of aluminum sulfate, 1 part of sulfur-loaded activated carbon pellets, and 1 part of oxidant.

[0036] In this embodiment, the oxidizing agent is chlorine dioxide and sodium hypochlorite.

[0037] In this embodiment, the modified polyacrylamide is prepared in the following manner:

[0038] After polyacrylamide is made into a solution with a concentration of 1% in distilled water and fully dissolved, keep the temperature in a constant temperature water bath to 50°C, add sodium hydroxide with a con...

Embodiment 2

[0041] The raw materials of the composite flocculant in this example include the following components in parts by weight: 20 parts of polydimethyldiallylammonium chloride, 10 parts of polyaspartic acid, 12 parts of modified polyacrylamide, bisdithio 10 parts of chitosan grafted with carbamic acid, 5 parts of hexadecyltrimethylammonium bromide, 6 parts of nanoscale iron filings, 6 parts of methanol, 6 parts of sodium bentonite, 8 parts of SA630 heavy metal collector, polymerized 5 parts of aluminum sulfate, 3 parts of sulfur-loaded activated carbon pellets, and 2 parts of oxidizing agent.

[0042] In this embodiment, the oxidizing agent is chlorine dioxide and sodium hypochlorite.

[0043] In this embodiment, the modified polyacrylamide is prepared in the following manner:

[0044] After polyacrylamide is made into a solution with a concentration of 1% in distilled water and fully dissolved, keep the temperature in a constant temperature water bath to 55°C, add sodium hydroxide ...

Embodiment 3

[0047] The raw materials of the composite flocculant in this example include the following components in parts by weight: 10 parts of polydimethyldiallylammonium chloride, 10 parts of polyaspartic acid, 8 parts of modified polyacrylamide, bis-dithio 10 parts of chitosan grafted with carbamic acid, 1 part of hexadecyltrimethylammonium bromide, 6 parts of nanoscale iron filings, 3 parts of methanol, 6 parts of sodium bentonite, 4 parts of SA630 heavy metal collector, polymerized 5 parts of aluminum sulfate, 1 part of sulfur-loaded activated carbon pellets, and 2 parts of oxidizing agent.

[0048] In this embodiment, the oxidizing agent is chlorine dioxide and sodium hypochlorite.

[0049] In this embodiment, the modified polyacrylamide is prepared in the following manner:

[0050] After polyacrylamide is made into a solution with a concentration of 1% in distilled water and fully dissolved, keep the temperature in a constant temperature water bath to 50°C, add sodium hydroxide ...

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PUM

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Abstract

The invention discloses an oil and gas field wastewater treatment process. The oil and gas field wastewater treatment process comprises the following steps: a, treating the oil and gas field wastewater through a water inlet buffer tank, adding 1 / 3 part of composite flocculating agent into sewage discharged from the inlet buffer tank, entering an oil and water mercury separator and performing oil and water separation; b, treating the sewage subjected to oil and water separation by an air flotation buffer tank, adding the residual composite flocculating agent, removing oil and flocculent suspended materials through an air flotation mercury-removing device and separating out dirty oil and sludge; and c, removing mercury and suspended materials from the sewage treated by the air flotation mercury-removing device through an adsorbing and filtering device to obtain purified water, agglomerating colloid through electrical neutralization, adsorption bridging, enrichment and the like, precipitating and separating again, removing oil, nitrate, heavy metal ions and suspended materials from the sewage, in particularly the effect of removing toxic and harmful substances such as mercury from theoil and gas field wastewater is obvious, the process is simple, the use aspect of the medicaments is quicker, various medicaments are cooperatively used, the medicaments generate synergistic effect,and the treatment effect on the wastewater is improved.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to an oil and gas field wastewater treatment process. Background technique [0002] The production wastewater in the process of oil and gas field development contains inorganic mercury and alkylmercury, as well as refractory organic pollutants such as petroleum, sulfides, salts and minerals. Chemical additives make the composition of oil and gas field wastewater very complex. In particular, the chlorine ion content in oil and gas field wastewater can be as high as 30,000 mg / l, which has caused serious interference and impact on the mercury removal and organic pollutant removal processes. Mercury removal, removal of organic pollutants and high chloride ions are intertwined, interfering, restricting and influencing each other, which greatly increases the difficulty of wastewater treatment. Therefore, the treatment of mercury-containing oil and gas field wastewater is a major problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10C02F101/16C02F101/20C02F101/30
CPCC02F1/001C02F1/24C02F1/28C02F1/281C02F1/283C02F1/40C02F1/52C02F1/5245C02F1/5263C02F1/56C02F1/62C02F1/72C02F1/76C02F9/00C02F2101/163C02F2101/20C02F2101/30C02F2103/10
Inventor 王金霞朱韵李治鹏桑鹏程罗乐周皓蔡庆赵雪李谢玲
Owner CHONGQING VOCATIONAL INST OF ENG