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A high-salinity heavy metal refractory shale gas extraction wastewater treatment system and treatment method

A shale gas exploitation and treatment method technology is applied in the field of high salinity heavy metal refractory shale gas exploitation wastewater treatment system, and can solve the problems of high operating cost of the treatment process, inability to utilize intermediate products as resources, and poor system stability.

Active Publication Date: 2021-09-14
四川恒泰环境技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a treatment system and treatment method for high-salinity heavy metal refractory shale gas mining wastewater to solve the problems of high operating costs, poor system stability and inability to recycle intermediate products in existing treatment processes problem of use

Method used

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  • A high-salinity heavy metal refractory shale gas extraction wastewater treatment system and treatment method
  • A high-salinity heavy metal refractory shale gas extraction wastewater treatment system and treatment method

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Effect test

Embodiment 1

[0064] A system for treating high-salinity heavy metal refractory shale gas exploitation wastewater, including a pretreatment unit, an MVR evaporation unit, an advanced treatment unit and a membrane treatment unit that are connected in sequence; a coagulation sedimentation tank and a low temperature rise MVR system There is an intermediate pool 1 in between.

[0065] Among them, the pretreatment unit includes an oil separation adjustment tank, a pH adjustment tank 1, an integrated air flotation tank, a dehardening sedimentation tank, an advanced chemical oxidation tank, a pH adjustment tank 2, an advanced chemical oxidation sedimentation tank, and a coagulation sedimentation tank. The wastewater is treated with oil separation, adjustment, pH adjustment, air flotation, de-hardening, advanced oxidation, etc., to remove oily substances, micro-suspended solids, colloidal substances and hardness in the wastewater, and oxidatively degrade the organic matter in the wastewater. The su...

Embodiment 2

[0074] A method for treating high-salinity heavy metal refractory shale gas exploitation wastewater, comprising the following steps:

[0075] (1) Preprocessing unit

[0076] S1. Oil separation adjustment tank: The gas field water enters the oil separation adjustment tank from outside the plant area, and the oil in the waste water is treated by the oil suction machine set in the oil separation tank. The waste water after oil removal enters the adjustment tank, and the wastewater is treated The mass is uniform and the waste liquid is formed;

[0077] S2, pH adjustment tank 1: use the metering pump to add sodium hydroxide to adjust the pH of the waste liquid 2, after adjusting the pH value of the waste water to 9, the waste liquid 2 with a large number of fine suspended particles will be formed;

[0078] S3. Integrated air flotation tank: use metering pump to add PAC and PAM, remove the tiny suspended substances and colloids in waste liquid 2 by air flotation, and form waste liq...

Embodiment 3

[0095] A method for treating high-salinity heavy metal refractory shale gas exploitation wastewater, comprising the following steps:

[0096] (1) Preprocessing unit

[0097] S1. Oil separation adjustment tank: The gas field water enters the oil separation adjustment tank from outside the plant area, and the oil in the waste water is treated by the oil suction machine set in the oil separation tank. The waste water after oil removal enters the adjustment tank, and the wastewater is treated The mass is uniform and the waste liquid is formed;

[0098] S2, pH adjustment tank 1: use a metering pump to add sodium hydroxide to adjust the pH of the waste liquid II, and adjust the pH value of the waste water to 8 to 9 to form a large number of fine suspended particles of the waste liquid II;

[0099] S3. Integrated air flotation tank: use metering pump to add PAC and PAM, remove the tiny suspended substances and colloids in waste liquid 2 by air flotation, and form waste liquid 3 in t...

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Abstract

The invention discloses a treatment system and a treatment method for high-salinity heavy metal refractory shale gas exploitation wastewater. The treatment method comprises the following steps: (1) wastewater pretreatment; (2) MVR evaporation treatment; (3) advanced treatment; (4) membrane treatment. The method of the present invention is used to treat high-salinity heavy metal refractory shale gas mining wastewater, which can not only effectively solve the problem of high salt content in this type of wastewater, but also meet the requirements of ultra-low discharge of this type of wastewater, and can also realize intermediate The resource utilization of products produces good economic benefits and meets the needs of sustainable development.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment system and a treatment method for shale gas exploitation wastewater with high salinity heavy metal refractory. Background technique [0002] my country is rich in shale gas resources, but the development of shale gas is still in the initial stage. At present, the country is actively promoting the development and utilization of shale gas. The main source of shale gas extraction wastewater is drilling wastewater, including drilling wastewater, well washing wastewater, acidification wastewater, and fracturing flowback fluid. The quality and quantity of wastewater produced in the process of shale gas exploitation fluctuates greatly. The main pollutants in wastewater are oil, salt (chloride and sulfate), hardness (calcium ion, magnesium ion), heavy metal ion (such as arsenic) and Some high-molecular polymers, among which the polymers are used in d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/04C02F1/44C02F1/40C02F1/66C02F1/24C02F1/52C02F1/72C02F103/10
CPCC02F1/041C02F1/24C02F1/40C02F1/441C02F1/5245C02F1/56C02F1/66C02F1/72C02F3/1268C02F3/30C02F9/00C02F2103/10C02F2301/08
Inventor 蒲柳杨红梅杨汉军黄莉唐俊田智刘世林王建强郑庆生杜洪飞龚斌文葵姚铭肖德龙赵绍燕王科慧
Owner 四川恒泰环境技术有限责任公司
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