Microbial process for treating oil-contained emulsified sewage

Abstract

A microbial process for treating the emulsified sewage containing oil features that a combined flora obtained through screening, inoculation and decontamination is added to the said sewage and the sewage flows through regulatable aerating pool, slane oil-removing pool and biologic aerating filter pool. Its advantages are short time (4-6 hr), and high removal rate of 98% for oil, or 95% for CODcr,or 95% for BOD5, so completely reaching the national standard for discharge.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a microbial treatment technology for emulsified oil wastewater. technical background [0002] The oily wastewater such as emulsified oil, petroleum oil, surfactant, etc. produced in the production process of petroleum exploration, iron and steel metallurgy, oil refining, electric power and mechanical processing, etc., is difficult to treat and discharge up to the standard due to its complex composition. The conventional treatment method is The steps of dosing, demulsification, coagulation, precipitation and strong oxidation are used. The problems of this process are: 1) complex process, high labor intensity and poor safety; 2) high investment cost; 3) high operating cost and difficult 4) The amount of sludge after dosing is large, and there is a problem of secondary pollution. In recent years, there have been reports on the treatment of this type of wastewater with microorganisms, su...

AI Technical Summary

Problems solved by technology

[0002] The oily wastewater such as emulsified oil, petroleum oil, surfactant, etc. produced in the production process of petroleum exploration, iron and steel metallurgy, oil refining, electric power and mechanical processing, etc., is difficult to treat and discharge up to the standard due to its complex composition. The conventional treatment method is The steps of dosing, demulsification, coagulation, precipitation and strong oxidation are used. The problems of this process are: 1) complex process, high labor intensity and poor safety; 2) high investment cost; 3) high operating cost and difficult Discharge up to the standard; 4) The amount of sludge after dosing is large, and there is a problem of secondary pollution

In recent years, there have been reports on the treatment of this type of wastewater with microorganisms, such as "Experimental Research on Cold Rolling Wastewater Treatment" by Shanghai Mechanical and Electrical Design Institute and East China Normal University (Shanghai Environmental Science-1997.016(012)-0017-0019), The process of dosing precipitation + SBR biochemistry + sand filtration is adopted, and Al is used for dosing 2 (SO 4 ) 3 Coagulant, wastewater is biochemically treated by activated sludge method after coagulation and sedimentation. The disadvantage of this process of using microbial wastewater treatment in activated sludge is that it needs to add coagulant, the amount of sludge is large, and there is secondary pollution. , and the aeration time in the process is long, it takes 8 hours, the scope of application is narrow, and the oil content in the wastewater should generally be controlled below 50mg / l