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A kind of shale gas production water treatment method

A technology for effluent treatment and shale, applied in mining wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of slow treatment speed, large floor space, poor economy, etc. cost, reducing the content of ammonia nitrogen, and preventing internal scaling

Active Publication Date: 2020-08-11
重庆市涪陵页岩气环保研发与技术服务中心 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few researches on the treatment and reuse technology of drilling wastewater and fracturing wastewater at home and abroad, but there are few researches on the standard discharge treatment technology of shale gas produced water, and the main difficulties faced in the treatment of shale gas produced water are: specific water quality The characteristics and output rules are unknown; the relevant wastewater treatment technology is not targeted, the process is complicated, the treatment cost is high, and the economy is poor, so it cannot be directly applied
CN103304104A discloses a method for splitting treatment of natural gas wastewater. The treatment process of the method is complicated. First, oil separation is carried out on inclined plates, then coagulation and sedimentation are carried out, and then air flotation and pressure filtration are carried out, and finally evaporation treatment is carried out. Numerous devices and large footprint
CN1579968A discloses a treatment process of "coagulation + air flotation + anaerobic + aerobic + two-stage biological aerated filter". powerful
In view of the fact that the existing relevant wastewater treatment technologies cannot meet the current status of shale gas produced water discharge treatment requirements, and with the increasingly stringent environmental protection requirements, there is an urgent need for efficient, energy-saving and economical discharge treatment technologies to treat produced water

Method used

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  • A kind of shale gas production water treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The shale gas produced water treatment method of the present embodiment has the steps as follows,

[0036] Step 1: adjust the pH of the shale gas production water to 7 in the pH adjustment tank, and obtain the material after adjusting the pH value;

[0037] Step 2: Pump the produced water after pH adjustment into the electrocoagulation device, the reaction current of the device is 45A, and the produced water flow rate is 10m 3 / h, the material after the electrocoagulation reaction flows into the flocculation sedimentation tank through the pipeline;

[0038] Step 3: adjust the pH value of the material obtained in step 2 to 8 after electrocoagulation, and produce a coagulation after stirring. After solid-liquid separation with a plate and frame filter press, clear liquid and massive solid are obtained, and the massive Recycling of solids, such as making bricks, etc.;

[0039] Step 4: Import the clear liquid obtained in step 3 into the heating tank and heat it for 20 minut...

Embodiment 2

[0043] The shale gas production water standard discharge treatment process in this implementation example, the steps are as follows:

[0044] The shale gas produced water treatment method of the present embodiment has the steps as follows,

[0045] Step 1: adjust the pH of the shale gas production water to 8 in the pH adjustment tank, and obtain the material after adjusting the pH value;

[0046] Step 2: Pump the produced water after pH adjustment into the electrocoagulation device, the reaction current of the device is 55A, and the produced water flow rate is 15m 3 / h, the material after the electrocoagulation reaction flows into the flocculation sedimentation tank through the pipeline;

[0047] Step 3: adjust the pH value of the material obtained in step 2 to 8 after electrocoagulation, and produce a coagulation after stirring. After solid-liquid separation with a plate and frame filter press, clear liquid and massive solid are obtained, and the massive Recycling of solids...

Embodiment 3

[0052] Step 1: adjust the pH of the shale gas production water to 5 in the pH adjustment tank, and obtain the material after adjusting the pH value;

[0053] Step 2: Pump the produced water after pH adjustment into the electrocoagulation device, the reaction current of the device is 45A, and the produced water flow rate is 10m 3 / h, the material after the electrocoagulation reaction flows into the flocculation sedimentation tank through the pipeline;

[0054] Step 3: adjust the pH value of the material obtained in step 2 to 8 after electrocoagulation, and produce a coagulation after stirring. After solid-liquid separation with a plate and frame filter press, clear liquid and massive solid are obtained, and the massive Recycling of solids, such as making bricks, etc.;

[0055] Step 4: Import the clear liquid obtained in step 3 into the heating tank and heat for 20 minutes to raise the temperature to 80°C; then add sodium carbonate to the heating tank and react for 30 minutes, ...

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Abstract

The invention belongs to the technical field of the treatment of industrial wastewater, and particularly relates to a treatment method of shale-gas produced water. The treatment method comprises the following steps of a step I, regulating the pH (potential of Hydrogen) value of the shale-gas produced water to be 5 to 8 in a pH regulation pool, so as to obtain a pH value adjusted material; a step II, subjecting the pH value adjusted material obtained in the step I to an electric flocculation reaction in an electric flocculation device, so as to obtain an electric flocculation subjected material subjected to electric flocculation; a step III, regulating the pH value of the electric flocculation subjected material subjected to electric flocculation obtained in the step II to be 7 to 10, so as to obtain a clear solution and a blocky solid; a step IV, heating the clear solution, which is obtained by the solid-liquid separation in the step III, to 80 DEG C, adding a hardness remover, carrying out a reaction for 10min to 30min, and subjecting a mixed material after the reaction to the solid-liquid separation once again, so as to obtain the clear solution and a solid; a step V, adjusting the pH value of the clear solution obtained in the step IV to be 5 to 7, adding an ammonia nitrogen remover, and carrying out the reaction for 10 to 20min, so as to obtain the mixed material; a step VI, subjecting the mixed material obtained in the step V to quadruple-effect evaporation treatment, so as to obtain condensate water and a concentrated solution.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment method for shale gas produced water. Background technique [0002] Shale gas is a kind of unconventional natural gas that exists in dark organic matter-rich mud shale and argillaceous siltstone in a free state, adsorbed state or dissolved state, and has the characteristics of self-generation, self-storage and continuous accumulation. features. In recent years, the rapid development of the unconventional natural gas industry in the United States has made it the earliest and most mature country in the commercial development of shale gas. The rapid growth of shale gas production in the United States has not only had a major impact on the international natural gas market and the world's energy structure, but also promoted the exploitation of shale gas in the world's major oil and gas resource countries. As the world's largest country ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/10C02F101/16
CPCC02F1/04C02F1/463C02F1/66C02F5/08C02F9/00C02F2101/16C02F2103/10C02F2301/08
Inventor 金吉中王丹陈龙利梅绪东何敏张思兰王海峰文海力张涛
Owner 重庆市涪陵页岩气环保研发与技术服务中心