Treatment method for recycle of oil field produced water
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A treatment method and technology for produced water, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve the problems of poor water quality and low treatment efficiency, and achieve Strengthen the flushing effect, reduce membrane fouling, and reduce the effect of membrane fouling
Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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[0006] The technical problem to be solved by the present invention is to provide a method for the treatment and reuse of oilfield produced water, which can effectively remove oil and suspended solids through air flotation, and through intensified biological treatment, overcome the problems of low treatment efficiency and water quality in the prior art. Poor and other problems, the organic matter, oligomers, petroleum, etc. that po
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Embodiment 1
[0038] same steps figure 1 , the process parameters are as follows:
[0039] In step (2), the obligate combination strain was purchased from Beijing Tianhao Kerun Environmental Technology Co., Ltd. (Room 2601, Building B2, Tianchuang Shiyuan, No. 312 Huizhong Beili, Chaoyang District, Beijing, Tel: 010-84274689, Zip Code: 100012) The engineering bacteria preparation (composed of Desulfovibrio, Enterobacter, Clostridium, Desulfotomaculum, Pantoea bacteria, etc., by equal weight Proportional mixing, solid powder), use oilfield produced water to prepare sewage with COD not less than 200mg / L, and activate it by exposure for 4-5 days. The wet weight ratio is 3:7 for compounding. After compounding, the activated sludge is put into the hydrolytic acidification tank and the aerobic tank. The hydrolytic acidification will break the chain of oligomers and increase its BOD / COD ratio, and then enter the aerobic tank for preliminary removal. Some petroleum and organic matter in sewage. ...
Embodiment 2
[0049] same steps figure 1 , the process parameters are as follows:
[0050] In step (2), the obligate combined bacteria is the same as in Example 1; the influent for hydrolysis and acidification is 3m 3 / h, the hydraulic retention time is 12h, the hydraulic retention time of the aerobic tank is 15h, and the design air-water ratio is 25:1;
[0051] In step (3) and step (5), the rising velocity of the settling tank is 1.2m / h;
[0052] In step (4), the hydraulic retention time of the contact oxidation tank is 17h;
[0053] In step (6), the filtration rate of the double filter material filter is 8m / h;
[0054] In step (8), the ultrafiltration membrane flux is 30L / m 2 h; the forced circulation ratio (circulation volume: water intake) is 1.8:1; the cross-flow ratio (cross flow: water intake) is 0.1:1, backwashing with ultra-filtered water every 50 minutes, and normal backwashing 2 times the amount of water. Carry out a small chemical alkali wash every 8th backwash, the agents...
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Abstract
The invention relates to a treatment method for recycle of oil field produced water. The treatment method comprises an air floatation process, a biochemical treatment process, a filtration process, an ultrafiltration process and a reverse osmosis process. Oil field produced water is subjected to the biochemical treatment process so that the content of organic matters, petroleum matters and oligomers in the oil field produced water can be effectively reduced, wherein the organic matters, the petroleum matters and the oligomers can cause membrane pollution easily. The oil field produced water subjected to the biochemical treatment process orderly passes through a double-filter material filter and a disc filter so that a part of suspensions are removed, then enters into an ultrafiltration device and is subjected to designed conventional backwashing and dosing backwashing in a forced circulation-crossflow filtration way. Ultrafiltration produced water enters into a reverse osmosis device and is subjected to designed timed low-voltage positive pulse processing and regular sterilization. Reverse osmosis produced water is recycled and is utilized as high-quality thermal recovery boiler water. Reverse osmosis concentrated water is subjected to recharge processing. Through the air floatation process, the biochemical treatment process, the filtration process and a special membrane operation mode, cleaning periods and service lives of an ultrafilter membrane and a reverse osmosis membrane can be effectively prolonged. The treatment method has the characteristics of high treatment efficiency, good economic effectiveness and stability.
Description
technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for advanced treatment and reuse of oilfield produced water. Background technique [0002] In the process of oil extraction, the produced crude oil contains a large amount of water, which is separated after oil and gas separation and dehydration treatment, and the separated sewage is called oilfield produced water. In the past, after the oilfield produced water was treated, all the water was flooded to drive oil or reinjected into the formation, and it was basically not discharged. However, at present, most of my country's major oilfields are in the middle and late stage of oilfield construction. In order to improve oil recovery, with the use of technologies such as thermal recovery and polymer injection oil recovery, the water content of some oilfields is as high as 90%, making the remaining sewage The volume is increasing, most of the wastewater...
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