Method for processing oilfield wastewater and fixing CO2 (carbon dioxide) by using microalgae

A technology for oilfield sewage and CO2, applied in chemical instruments and methods, mining wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problems of immature large-scale breeding technology, difficulty in large-scale application, and high cost

Inactive Publication Date: 2013-05-22
SINOPEC PETROLEUM ENG DESIGN +1
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Problems solved by technology

[0004] CO using microalgae 2 Although gas fixed emission reduction has become increasingly mature in theory, and many enterprises and institutions have also carried out beneficia

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  • Method for processing oilfield wastewater and fixing CO2 (carbon dioxide) by using microalgae

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Embodiment Construction

[0016] In order to further disclose the technical solution of the present invention, the following is a detailed description with embodiments in conjunction with the accompanying drawings of the specification:

[0017] The implementation process is as follows:

[0018] A method of using microalgae to treat oilfield sewage and fix CO 2 Firstly, the oilfield sewage is tested; to ensure that the crude oil contained in the oilfield sewage is less than 10 mg / L, the TOC in the sewage is less than 40 mg / L, and the COD is less than 100 mg / L. Then proceed as follows:

[0019] (1) Change CO 2 The gas is directly passed into the fresh oilfield sewage in the gas-water preliminary mixing tank 1, and the CO 2 Non-CO gas 2 The components chemically or physically react with some pollutants in the oilfield sewage, and the pollutants that affect the growth of microalgae are removed. After the gas and water are mixed, they enter the mixed water quality stabilization pool 2 for water quality stabilizati...

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Abstract

The invention provides a method for processing oilfield wastewater and fixing CO2 (carbon dioxide) by using microalgae; the method comprises the following steps of: using oilfield wastewater in which the crude oil content is lower than 10mg/L, the TOC (total organic carbon) is lower than 40mg/L and the COD (chemical oxygen demand) is lower than 100mg/L for microalgae cultivation and carbon fixing, introducing CO2 directly into the wastewater, selecting the microalgae with high stress resistance, high oil content and high function in degrading petroleum hydrocarbon according to the water quality of the oilfield wastewater introduced with the CO2, combining the large-scale cultivation of the microalgae with the wastewater treatment, building a large-scale cultivation system by using five stepped microalgae processing ponds which are connected with each other, and then adjusting the water temperature to be 20 DEG C to 35 DEG C; a silicon carbide micro-filtration membrane is used for harvesting, and 10-20% of the harvested microalgae is used as algae seed for the algae liquid cultivation of the next batch and 70-90% of the harvested microalgae is used for preparing biodiesel. The wastewater temperature which is the most proper for the growth of the algae is controlled by controlling the content of fresh wastewater, and the full-year stable and continuous running of the oilfield wastewater processing and CO2 fixing system is achieved.

Description

Technical field [0001] The invention belongs to the field of sewage treatment technology and new-born material energy, and particularly relates to a method of using microalgae to treat oilfield sewage and fix CO 2 Methods. Background technique [0002] The greenhouse effect is the biggest environmental problem facing all mankind in the 21st century. Industrial development leads to large amounts of CO 2 Discharged into the atmosphere, only the maximum absorption and conversion of CO 2 In order to coordinate economic development and environmental issues. Current CO 2 The fixed emission reduction technologies can be divided into three categories: physical treatment, chemical treatment and biological fixation. Among them, in the biological fixation method, microalgae can use CO under photosynthesis. 2 Synthesize a large number of biological substances, such as protein, starch, vitamins and lipids. And microalgae have the advantages of high photosynthesis rate, fast reproduction, st...

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Application Information

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IPC IPC(8): C02F9/14C02F3/34C02F103/10
Inventor 张建王海峰丁慧孙广领贾建昌张磊
Owner SINOPEC PETROLEUM ENG DESIGN
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