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Method for fixing CO2 and treating oil field sewage by using microalgae

A technology for oilfield sewage and microalgae, applied in sterilization/microdynamic water/sewage treatment, separation method, aerobic process treatment, etc., can solve the problems of high cost, immature large-scale breeding technology, and difficulty in large-scale application. , to reduce costs

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 beneficial attempts, there are still many difficulties in realizing large-scale application, mainly because of the high cost and the limitation of large-scale breeding technology. immature

Method used

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  • Method for fixing CO2 and treating oil field sewage by using microalgae

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Firstly, the oil field sewage of the oilfield sewage joint station is pretreated for oil removal by air flotation method. The pretreatment uses high gradient coalescence air flotation, and no chemical agents are added in the process of air flotation and oil removal to avoid damage to the oil field. Subsequent biological degreasing and microalgae cultivation produce toxicity; the oilfield sewage after most of the crude oil is removed by air flotation enters the activated sludge or biofilm degreasing treatment system to further remove crude oil, and the activated sludge or biofilm degreasing process According to TOC: N: P = 100: 5: 1 weight ratio, add N, P nutrient salt, the crude oil contained in the oil field sewage after activated sludge method or biofilm method treatment is lower than 1mg / L, and the TOC is less than 60 mg / L, COD is less than 150 mg / L;

[0023] b. First, the oilfield sewage treated with the aerobic biological method in step a overflows into the micr...

Embodiment 2

[0026] a. Firstly, the oil field sewage of the oilfield sewage joint station is pretreated for degreasing by air flotation method. Degreasing and microalgae cultivation produce toxicity; oilfield sewage after most of the crude oil is removed by air flotation enters the activated sludge method or biofilm deoiling treatment system to further remove crude oil, and the activated sludge or biofilm deoiling process is carried out according to the TOC: N: P = 100: 10: 1 weight ratio of N, P nutrient salt, the crude oil contained in the oil field sewage after activated sludge method or biofilm method treatment is less than 1mg / L, and the TOC in the sewage is less than 60 mg / L, COD less than 150 mg / L;

[0027] b. First overflow the oilfield sewage treated with the aerobic biological method into the microalgae biological cultivation system in step a, and CO 2Flue gas with a content of 15% is directly charged into the track-type microalgae cultivation system through the aeration system ...

Embodiment 3

[0030] a. Firstly, the oil field sewage of the oilfield sewage joint station is pretreated for oil removal by air flotation method. The pretreatment uses high gradient coalescence air flotation, and no chemical agents are added in the process of air flotation and oil removal to avoid damage to the oil field. Subsequent biological degreasing and microalgae cultivation produce toxicity; the oilfield sewage after most of the crude oil is removed by air flotation enters the activated sludge or biofilm degreasing treatment system to further remove crude oil, and the activated sludge or biofilm degreasing process According to TOC:N:P=100:8:1 weight ratio, N and P nutrient salts are added, and the crude oil contained in the oil field sewage after the treatment by the activated sludge method or the biofilm method is less than 1mg / L. TOC is less than 60 mg / L, COD is less than 150 mg / L;

[0031] b. First, the oilfield sewage treated with the aerobic biological method in step a overflows...

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Abstract

The invention provides a method for fixing CO2 and treating oil field sewage by using microalgae. The method comprises the following steps: a, firstly, performing oil removing pretreatment on oil field sewage in an oil field sewage union station by using an exhaust gas flotation method, feeding the oil field sewage of which most crude oil is removed through air flotation into an activated sludge method or biological membrane method oil removing treatment system for further removing crude oil, and adding N and P nutritive salts according to a weight part ratio of TOC:N:P being 100:(5-10):1 in the activated sludge method or biological membrane method oil removing process; b, introducing flue gas of which the content of CO2 is 3-15% into the oil field sewage after aerobic biological method treatment in the step a; then, feeding into a race track type microalgae culture system, adding microalgae seeds into the race track type microalgae culture system, growing for 5-15 days until the density of microalgae is greater than 10<7> / ml and the grease content is greater than 20%; c, feeding the alga-containing oil field sewage treated by the race track type microalgae culture system into a flocculation settling pond, collecting microalgae by using a flocculation method, filter-pressing the algal sapropel by using a filter-press to make alga cakes, extracting biodiesel oil from the alga cakes; filtering, sterilizing and deoxidizing settling effluent, and refilling the settling effluent back to a stratum to remove oil.

Description

technical field [0001] The invention belongs to the field of oilfield sewage treatment and new biomass energy, in particular to a method for treating oilfield reinjection sewage and fixing CO by using aerobic biological method and microalgae. 2 Methods. Background technique [0002] The greenhouse effect is the biggest environmental problem faced by all mankind in the 21st century. Industrial development leads to large amounts of CO 2 Emitted to the atmosphere, only the maximum absorption and conversion of CO 2 In order to coordinate the issues between economic development and the environment. Currently 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 immobilization method, microalgae can use CO under photosynthesis 2 Synthesize a large number of biological substances, such as proteins, starches, vitamins and lipids. Moreover, microalgae ha...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/12C02F3/02B01D53/84B01D53/62C12N1/12C02F1/24C02F1/52C02F1/50C02F1/20C02F103/10
CPCB01D53/62B01D53/84C02F1/20C02F1/24C02F1/50C02F1/52C02F3/02C02F3/12C02F9/00C02F2101/32C02F2103/365C12N1/12Y02A50/20Y02P20/59Y02W10/10
Inventor 王海峰张建丁慧邓波孙广领贾建昌张磊
Owner CHINA PETROLEUM & CHEM CORP
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