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Process for pretreating natural gas produced water with electric flocculation

A natural gas and electric flocculation technology, applied in mining wastewater treatment, filtration treatment, water/sewage treatment, etc., can solve the problems of underground gas layer development impact, single well reinjection limit, and high transportation costs

Inactive Publication Date: 2017-02-22
SICHUAN XINGAO ENVIRONMENTAL TECH SERVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this type of wastewater is mainly reinjected into deep wells after simple treatment, but there are still factors such as the limitation of reinjection volume of a single well, high transportation costs, and impact on the development of underground gas reservoirs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Adjust the pH value of the natural gas production water to 7, and install it in the flow type electroflocculation equipment with a surface area of ​​100mm 2 Aluminum plates with a spacing of 20mm, the connection mode of the electrodes is the double pole connection mode, and the cathode and anode plates are distributed in multiple groups in the electrolytic cell at intervals. Turn on the pump to pump the wastewater into the electrocoagulation equipment, start the pulse power supply, adjust the current intensity to 6A, then start the electrocoagulation reaction, set the reaction time to 9 minutes; after the reaction is completed, the wastewater is left to settle for 20 minutes, and then the plate and frame filter press is used Filtration, the filtrate is the pretreated produced water.

Embodiment 2

[0022] Adjust the pH value of the natural gas production water to 7.2, and install it in a mobile electroflocculation equipment with a size of 274mm×72mm×2mm and a surface area of ​​170mm 2 Aluminum plates with a spacing of 30mm, the connection mode of the electrodes is the double pole connection mode, and the cathode and anode plates are distributed in multiple groups in the electrolytic cell at intervals. Turn on the pump to pump the wastewater into the electrocoagulation equipment, start the pulse power supply, adjust the current intensity to 9A, then start the electrocoagulation reaction, set the reaction time to 10min; Filtration, the filtrate is the pretreated produced water.

Embodiment 3

[0024] Adjust the pH value of the natural gas production water to 7.6, and install it in the flow type electroflocculation equipment with a surface area of ​​200mm 2 Aluminum plates with a plate spacing of 35mm, the connection mode of the electrodes is a bipolar connection mode, and the cathode and anode plates are distributed in multiple groups at intervals in the electrolytic cell. Turn on the pump to pump the wastewater into the electrocoagulation equipment, start the pulse power supply, adjust the current intensity to 9A, then start the electrocoagulation reaction, set the reaction time to 10min; Filtration, the filtrate is the pretreated produced water.

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PUM

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Abstract

The invention relates to a process for treating natural gas produced water, in particular to a process for pretreating natural gas produced water with electric flocculation. The process comprises the following steps: a, adjusting the pH value of natural gas produced water to 7-8; b, performing electric flocculation on the natural gas produced water after adjusting the pH value through electric flocculation equipment; c, filtering the natural gas produced water after electric flocculation, to remove flocculation sediments. For the natural gas produced water containing complex components and more colloidal suspended substances, the treatment process of the pretreatment method can remove the vast majority of colloidal and suspended substances, is simple in process operation, unnecessary to add any chemical agent, high in treatment efficiency, good in effect, low in cost, small in equipment size, easy to achieve automated management, and small in amount of mud produced during reaction.

Description

technical field [0001] The invention relates to a process for treating natural gas produced water, in particular to a process for pretreating natural gas produced water by electrocoagulation. Background technique [0002] Natural gas produced water is the waste water that is extracted together with natural gas and is released after water and gas separation and dehydration treatment. The water quality of natural gas production is complex and varies greatly due to the geographical location of the gas field and the different mining and refining processes. At present, this type of wastewater is mainly reinjected into deep wells after simple treatment, but there are still factors such as the limitation of reinjection volume of a single well, high transportation costs, and impact on the development of underground gas reservoirs. It is difficult to treat high-salt wastewater from oil and gas fields. Oil and gas companies provide a large amount of clean energy and chemical raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/10
CPCC02F9/00C02F1/001C02F1/463C02F1/467C02F1/66C02F2103/10
Inventor 张涛蒲毅智
Owner SICHUAN XINGAO ENVIRONMENTAL TECH SERVICE CO LTD
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