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A kind of activated sludge cultivation method for waste drilling fluid treatment

A technology of waste drilling fluid and activated sludge, which is applied in the direction of using microorganisms, mining wastewater treatment, anaerobic digestion treatment, etc., to achieve high load resistance, increase tolerance, and increase the effect of contact area

Active Publication Date: 2019-10-15
北京世纪伟方生物技术有限公司
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  • Abstract
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Problems solved by technology

[0008] The present invention aims to provide an activated sludge cultivation method that is simple to operate, can quickly adapt to and tolerate the complex environment of waste drilling fluid, effectively degrade organic pollutants therein, and completely solve the pollution problem of waste drilling fluid

Method used

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Embodiment 1

[0034] The present invention is a kind of activated sludge cultivation method for waste drilling fluid treatment, which comprises the following process steps:

[0035] 1. Acquisition of strains: Due to the complex composition of waste drilling fluid, special strains need to be added in order to make activated sludge more effectively tolerate and treat waste drilling fluid. Existing microorganisms, the present invention obtains bacterial classification by following two methods:

[0036] 1) Strain screening method: After enrichment, acclimation, separation and purification from the waste drilling fluid to be treated, some strains with good growth are obtained, and as composite strains, they can be used as a strain source for activated sludge cultivation. The strains obtained by this method can be preserved in the form of concentrated liquid, and can also be made into dry bacterial preparation, which is further convenient for preservation and transportation. Specific operation: ...

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Abstract

The present invention discloses a method for culturing activated sludge for waste drilling fluid treatment, which comprises the following steps of: (1) obtaining a bacterial strain; and (2) culturing the activated sludge. A method for obtaining the bacterial strain is a bacterial strain screening method or a drilling fluid anaerobic treatment method. A method for culturing the activated sludge comprises: 1) addition of the bacterial strain and 2) domestication of the bacterial strain. The domestication of the bacterial strain comprises: a, stuffy aeration treatment; b, addition of the waste drilling fluid concentration step by step; c, continuous inflow; and d, culture finishing. In the method of the invention, bacteria from the waste drilling fluid is added, a drilling fluid complex environment is adapted faster, and the activated sludge culture and domestication time are greatly shortened. The activated sludge has higher anti-load tolerance than the activated sludge cultured by an ordinary method does and can continuously exist in a waste water disposal system. The adding amount of the activated sludge and generated manpower and material resource costs are reduced. The bacterial strain is attached to biological carriers, a contact area with the drilling fluid is increased, and the drilling liquid tolerance and degradation of the sludge are improved.

Description

technical field [0001] The invention relates to an activated sludge cultivation method for waste drilling fluid treatment, belonging to the technical field of wastewater treatment. Background technique [0002] As my country's oil and gas exploitation increases year by year, the amount of waste oil drilling fluid is also increasing year by year, and the degree of pollution is also increasing. [0003] Abandoned drilling fluid is the main waste generated in oil drilling operations, which has the characteristics of large quantity, great impact on the environment, difficult treatment and high treatment cost. Except for a small part of the waste drilling fluid that is recycled, most of it is simply disposed of by direct discharge, natural evaporation, deposition, drying and burial on the spot. During the rainy season, harmful substances in the drilling fluid flow into the farmland with water, Rivers seep into the surface, pollute soil and groundwater, and seriously affect the lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C12N1/36C02F103/10
Inventor 徐海英周雄志周航
Owner 北京世纪伟方生物技术有限公司
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