Process for treating and reclaiming polymer-contained sewage

Abstract

A process for deeply treating and reclaiming polymer-contained sewage incldues such steps as loading the said sewage in regulation pool, adding disinfectant; adsorbing 20-30% of suspended substance and bacteria, stage-1 membrane filtering to remove over 99% of suspended substance and bacteria, and filtrate out 80% of Ca2+ and Mg+2 ions, stage-2 membrane filtering to filtrate out 90% of Ca2+, Mg2+, K+ and Na+ ions, storing cleaned water 80%-85% in water tank, and using 15%-20% of concentrated liquid back for preparing polymer solution. Its advantages are high recovery rate of wate (72-81%), and no drainage.

Description

Technical field: [0001] The invention relates to the technical field of water treatment in the process of petroleum exploitation, and belongs to a process for advanced treatment and reuse of polymer-containing sewage. Background technique: [0002] The oily wastewater from the oil field is extracted from the stratum along with the crude oil, and the wastewater after oil and gas separation and dehydration is the oily wastewater. This oily sewage contains not only crude oil, but also various salts, suspended matter, harmful gases, organic matter and a large amount of suspended solids. Chemical agents are sometimes mixed in the oil and gas gathering and processing process. Treatment methods include physical and chemical methods (such as electrodialysis) and chemical oxidation methods, coagulation sedimentation or air flotation, and biological methods. Physical and chemical methods generally have high treatment efficiency, but the investment is large and the treatment cost is high, a...

AI Technical Summary

Problems solved by technology

Although the water treatment process of "hydrocyclone plus two-way filter as the main body" can better remove the pollutants in the sewage containing aggregates, part of the treated sewage containing aggregates can be reinjected and used, and the other part can only be discharged outside , the phenomenon of polluting the environment still exists, and at the same time, there are complex processes, and the quality of treated water cannot meet the requirements of external discharge.