Efficient and deep treatment process for high-concentration waste water in natural gas industry

A high-concentration wastewater and advanced treatment technology, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of large fluctuations in effluent water quality, low biochemical treatment effect, and dilution water consumption Large and other problems, to achieve the effect of low investment cost, easy solid-liquid separation, and low labor intensity

Active Publication Date: 2013-02-13
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0010] 2. Water quality, quantity and treatment status of gas field production wastewater
Its disadvantages are: the high-concentration wastewater has no removal of polymer refractory toxic and harmful substances, and the

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  • Efficient and deep treatment process for high-concentration waste water in natural gas industry
  • Efficient and deep treatment process for high-concentration waste water in natural gas industry

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[0037] An efficient and advanced treatment process for high-concentration wastewater in the natural gas industry includes the following steps:

[0038] Step one, physical and chemical pretreatment:

[0039] (1) After high-concentration wastewater (CODcr≈10000mg / l) is conventionally degreasing, 0.5-2.0% of the wastewater is added with hydrogen peroxide, and reacted in a fully mixed flow batch reactor for 4-10 hours at room temperature, preferably 8 hour;

[0040] (2) Add catalyst according to 0.5-2.0% of the waste water. The catalyst can be iron salt, copper salt or manganese salt. Iron salt is the best for catalytic oxidation reaction. The reaction time is 4-6 hours, taking 4 hours as good;

[0041] (3) Add 1~2% ferrous sulfate of wastewater, adjust the PH value to 8~9, add 0.002~0.005% of wastewater polyacrylamide, carry out flocculation reaction, and then separate by precipitation, settling time is 1~2 hours ;

[0042] Step 2. After the above-mentioned physical and chemical pretrea...

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Abstract

The invention discloses an efficient and deep treatment process for high-concentration waste water in a natural gas industry. High-concentration industrial wastewater is subjected to physicochemical pretreatment to improve the biodegradability of the wastewater, and toxic and harmful substances in the wastewater are eliminated simultaneously, medium and low-concentration gas-field wastewater and domestic wastewater are mixed, and biochemical treatment is performed, accordingly, the biochemical treatment efficiency is improved, poison and impact resistances of a system are enhanced, and the denitrification function is strengthened. The technological process is simple, the operation is stable, the removal rate is high, investments and operation costs are saved, the process can be fully applied to treat industrial wastewater of various gas fields, and discharged water can achieve environment friendly emission standards required by the country.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a high-efficiency advanced treatment process for high-concentration wastewater in the natural gas industry. Background technique [0002] The production and transportation of natural gas mainly includes the following processes: natural gas exploitation→transportation→natural gas purification→transportation→users. The main wastewater generated in this process is process wastewater and maintenance wastewater, which belongs to high-concentration gas field production organic wastewater. Although the source and location of each plant are different, the unit technology and principle process of natural gas exploitation and natural gas purification and pretreatment are basically similar, so the water quality characteristics of their wastewater are also similar. Gas field production wastewater generally has the following characteristics: [0003] (1) Gas field wastewater generally conta...

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Application Information

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IPC IPC(8): C02F9/14
Inventor 张永红秦兴述童富良陈彰兵赵琼杨晓秋杨洋吴福平何化曹乐季甘永昌顾江燕
Owner BC P INC CHINA NAT PETROLEUM CORP
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