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Treatment process of mercury-containing production waste water from exploitation of natural gas field

A technology for waste water production and treatment process, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Simple and stable process, good removal effect

Active Publication Date: 2014-09-24
CHINA GASOLINEEUM ENG +1
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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.
[0003] Most of the mercury removal technologies reported in China are for the removal of mercury from inorganic wastewater, but there are very few reports on the removal of mercury from wastewater containing a large amount of organic matter and refractory organic pollutants
In addition, the research reports on the removal of alkylmercury are even rarer and are still under study.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A treatment process for mercury-containing production waste water from natural gas field development, comprising the following steps:

[0034] (1) Pretreatment: The production wastewater with a chloride ion concentration of less than 30,000mg / L, a total mercury concentration of less than 20mg / L, and a chemical oxygen demand of less than 10,000mg / L is pretreated by degreasing and dewaxing to oil below 100mg / L, and the pH is adjusted The value is 3-6;

[0035] (2) Micro-electrolysis treatment: The pretreated production wastewater is treated by iron-carbon micro-electrolysis. The micro-electrolysis treatment focuses on removing toxic and harmful substances such as inorganic mercury and alkyl mercury in natural gas field wastewater, and at the same time degrades difficult degrade organic matter;

[0036] (3) Catalytic oxidation treatment: Add hydrogen peroxide, such as industrial hydrogen peroxide, to the water after the iron-carbon micro-electrolysis treatment in step (2)...

Embodiment 2

[0042] 60L of natural gas field development and production wastewater containing 28000mg / l of chloride ions, 19mg / L of total mercury, 57ng / L of alkylmercury, and 9300mg / L of chemical oxygen demand from which oil and paraffin have been removed, adjusted the pH with sulfuric acid The value is 3.1, and the metering pump is continuously used to enter the iron-carbon micro-electrolysis tower equipped with iron-carbon micro-electrolysis filler at a speed of 2L / h, and the effluent naturally flows into the catalytic oxidation kettle; 6g of metal catalyst (containing 3% active ingredient) is added to the catalytic oxidation kettle and 1200mL of industrial hydrogen peroxide with a mass concentration of 27.5%, adjust the pH value to 3.2 with 20% sulfuric acid, react intermittently for 12 hours, and then flow into the flocculation reaction tank, add a coagulant solution containing 180g of ferric chloride, and then add lime emulsion Adjust the pH value to 9.6, add 60mL of 0.1% cationic poly...

Embodiment 3

[0044] Natural gas fields where oil has been removed (oil content less than 10mg / l), paraffin containing chloride ions is 16000mg / l, total mercury is 14.5mg / L, alkylmercury is 57ng / L, and chemical oxygen demand is 6900mg / L Develop 60L of mercury-containing production wastewater to adjust the pH value to 4.0 with sulfuric acid, and continuously use a metering pump to enter the iron-carbon micro-electrolysis tower equipped with iron-carbon micro-electrolysis fillers at a speed of 3L / h, and the effluent naturally flows into the catalytic oxidation kettle; 3g of metal catalyst (containing 2% active ingredient) and 450mL of industrial hydrogen peroxide with a mass concentration of 27.5%, adjust the pH value to 4.0 with 20% sulfuric acid, stir intermittently for 8 hours and then flow into the flocculation reaction tank, add 600g of ferrous sulfate Coagulant solution, then add lime emulsion to adjust the pH value to 8.7, add 50mL of cationic polyacrylamide solution with a mass concent...

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Abstract

The invention discloses a treatment process of mercury-containing production waste water from exploitation of natural gas field, Which comprises the following steps: 1)pretreating; 2)performing micro electrolysis treatment; 3)performing catalytic oxidation treatment; 4)performing flocculation and deposition; 5)performing anaerobic treatment; 6)performing aerobic treatment; and 7)performing secondary deposition. The treatment process of the present invention has the beneficial effect that 1) poisonous and harmful substances such as inorganic mercury and alkyl mercury in waste water of oil and gas field can be removed through physicochemical treatment, difficultly degraded organic matters in waste water can be simultaneously degraded, so that good condition can be created for following biochemical treatment; 2)a baffle plate anaerobic reactor is used for performing an anaerobic reaction and time-delay aeration activated sludge technology for treating waste water in the natural gas field, chemical oxygen demand can be removed, microscale mercury can be simultaneously removed, the processed effluent can reach primary standard of a GB8978-1996 sewage comprehensive discharge standard; 3)alkyl mercury can be converted to inorganic mercury by employing the catalytic oxidation technology, and 4)the process is simple and stable, the processed effluent can accord with the standard.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment process for mercury-containing production wastewater in the development of natural gas fields, especially a treatment process for mercury-containing production wastewater. 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...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 赵琼甘永昌秦兴述曹亮陈彰兵张永红胡益武袁秋礼汤晓勇何化何益萍周宁曹乐季肖芳杨洋刘静
Owner CHINA GASOLINEEUM ENG
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