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Treatment method of water recovered from oil field refilling

A treatment method and a technology for extracting water, which are applied in the field of water treatment, can solve problems such as difficult to meet, and achieve the effect of improving biodegradability

Inactive Publication Date: 2004-08-04
JIANGSU BODA ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to meet these requirements with conventional processing techniques

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1, the treatment method of produced water for oilfield reinjection, the way of waste water flow is: oil-water separator-receiving tank-primary sedimentation tank-microbial reaction tank-membrane separation device-deoxygenation device-effluent, in the initial stage of treatment , Add the activated joint flora screened, inoculated and purified from nature to the microbial reaction pool. The joint flora is composed of Bacillus and Exobacter, and its activity is greater than 10 14 First, the joint flora is a powder with a carrier. The carrier is composed of cereal substances, nutrients, buffers and biological additives. The joint flora is activated before adding: use 25-30°C tap water, Sewage and combined bacteria are pre-wetted at a ratio of 9:1:1 for 30-60 minutes, stirred occasionally and then directly poured into the microbial reaction tank. The dosage is 0.01-0.02% of the weight of the treated wastewater. The water inlet conditions in this method are: PH=6-8, t...

Embodiment 2

[0013] Example 2, referring to Example 1, during the treatment of oilfield reinjection with produced water, the inlet water temperature is set between 25-35°C, and the hydraulic retention time in the microbial reaction tank is controlled at about 6-8 hours. During the process, in order to maintain the advantages of the flora, an appropriate amount of combined flora maintenance is added to the microbial reaction tank, and part of the concentrated sludge after membrane separation is returned to the primary sedimentation tank.

[0014] In the method of the present invention, the formation of microbial reaction tanks can be contact oxidation tanks, activated sludge tanks and aerated filter tanks. The membrane modules in the membrane treatment unit can be inorganic or organic fiber membranes or tubular membranes, and the oxygen removal device can be Vacuum deaeration, chemical deaeration, desorption deaeration, resin deaeration, etc. The primary settling tank can be gravity or incli...

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PUM

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Abstract

A process for treating the water recovered from oil field in order to inject the treated water back to oil field features the combination of biologic treating with membrane separation. The special bacillus and extreme bacillus are screened, inoculated and purified for using them in biologic treatment. Its advantage is high treating effect.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a microbial treatment method for oilfield produced water. technical background [0002] The main pollutants in oil extraction wastewater are crude oil and suspended solids, as well as a large amount of iron, sulfide, salt, etc. Oil removal is an important part of oil extraction wastewater treatment. At present, two-stage oil removal is usually used, that is, first-stage gravity oil removal, Secondary coagulation degreasing method (coagulation breaking demulsification and degreasing), in which organic or inorganic coagulants and demulsifiers need to be used, and part of the products are discharged as sludge after chemical reaction, while the other part Existing in reinjection water makes the water quality of oil extraction wastewater more and more complicated. Suspended solids in oil extraction wastewater are usually removed by pressure or gravity. At present, many oil fields use two-...

Claims

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Application Information

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IPC IPC(8): C02F1/40C02F3/00C02F3/34
Inventor 王娅娜
Owner JIANGSU BODA ENVIRONMENTAL PROTECTION
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