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Efficient catalytic oxidation coupling hardness removal system and process for salt-containing wastewater of an oil gas field

A technology for catalytic oxidation and salt-containing wastewater, applied in the field of coupling process, can solve the problems of low efficiency in removing hardness by the simple double-alkali method, and achieve the effects of reducing labor intensity, reducing the dosage of chemicals, and convenient management.

Inactive Publication Date: 2019-06-07
CHINA PETROLEUM ENG & CONSTR +2
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Problems solved by technology

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a high-efficiency catalytic oxidation coupling dehardening system and process for salty wastewater from oil and gas fields, which achieves low investment, small footprint, stable effluent quality, easy management and operation, and can fully realize automation Control, completely solve the problem of low efficiency of hardness removal by simple double alkali method

Method used

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  • Efficient catalytic oxidation coupling hardness removal system and process for salt-containing wastewater of an oil gas field

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Embodiment example 1

[0029] Taking saline wastewater from an oil and gas field in a block in Sichuan as the research object, the influent CODcr of oil and gas field saline wastewater is 400-1000mg / L, the calcium and magnesium hardness of the influent is 2000-7000mg / L, and the B / C of the influent is 0.05-0.1. Poor biodegradability.

[0030] The wastewater adopts the coupling treatment process of "catalytic oxidation + softening". After the system is running, the CODcr of the produced water is 150-400mg / L, the calcium and magnesium hardness of the effluent is 100-400mg / L, and the B / C of the effluent is 0.25-0.5. At this time, the biodegradability of the effluent is high, and further biochemical treatment and advanced treatment can reach the first-level discharge standard of GB8978-1996 integrated sewage discharge standard.

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Abstract

The invention discloses an efficient catalytic oxidation coupling hardness removal system and process for salt-containing wastewater of an oil gas field. The system comprises an adjusting water tank,a delivery pump and an integrated reaction device, which are sequentially connected. The integrated reaction device comprises a catalytic oxidation reaction device, a continuous reaction zone, a pH regulation zone, a softening reaction zone, a coagulation reaction zone, a flocculation reaction zone and a precipitation separation zone, which are sequentially connected. The adjusting water tank, thecatalytic oxidation reaction device, the continuous reaction area and the pH adjusting area are all connected with fans. Both the softening reaction zone and the precipitation separation zone are connected with a sludge reflux pump. The catalytic oxidation reaction device is connected with a DC power supply. Compared with the prior art, the treatment device has the positive effects that the treatment device adopts a highly integrated integrated design, one device has two or three functions, the occupied area is reduced, the management is convenient, and the labor intensity of workers is reduced; the chemical agent is utilized to the maximum extent; the biodegradability is improved, and CODcr in water is reduced.

Description

technical field [0001] The invention relates to a coupling process for improving the biodegradability, degrading CODcr and removing hardness of oil and gas field saline wastewater, in particular to a high-efficiency catalytic oxidation coupled hardness removal process for oil and gas field saline wastewater treatment in oil and gas fields containing high concentration of salt. Background technique [0002] At present, for the removal of hardness in ordinary sewage, the main process is the double alkali method, but this process can remove up to 50% of the hardness under the condition of high-salt oil and gas field saline wastewater as the water quality background The removal of organic matter is also dominated by flocculation and precipitation, which contributes less to the removal of CODcr. Contents of the invention [0003] In order to overcome the shortcomings of the prior art, the present invention provides a high-efficiency catalytic oxidation coupling dehardening syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F101/30C02F103/10
Inventor 张永红于建国郭成华宋兴福何化金艳吴福平张建海连伟周宁肖芳赵琼李宇童富良陈国平
Owner CHINA PETROLEUM ENG & CONSTR
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