Method for purifying sewage in river basin

Abstract

The invention relates to a method for purifying sewage in a river basin. The method comprises the following steps: allowing sewage in a river basin to flow through a first sewage filter blanket of a sewage treatment tank so as to filter out large-particle foreign materials in the sewage, thereby obtaining first-stage treated sewage; allowing the first-stage treated sewage to pass through four layers of sewage filter blankets of the sewage treatment tank so as to realize ozone purification treatment, thereby obtaining fifth-stage treated sewage; purifying the sewage containing alcohol substances by using a membrane bioreactor method so as to obtain sixth-stage treated sewage; and allowing the sixth-stage treated sewage to flow into a paddy field irrigation water reservoir via a disinfectionpipeline. When MBR is utilized in the invention for purification treatment of sewage containing PVA, the method stably performs sewage purification treatment and inhibits the occurrence of scale at the same time; and the method realizes real-time monitoring and purification treatment of the sewage before and after purification, is convenient for workers to learn about information in real time, shortens time for sewage treatment, achieves efficient separation of pollutants from water bodies and efficient degradation of the pollutants, and reuses paddy field irrigation water.

Description

technical field [0001] The invention relates to the field of purification treatment, in particular to a purification treatment method for watershed sewage. Background technique [0002] With the development of industrialization and urbanization, the pollution of water environment and the shortage of water resources are becoming more and more serious, and a large amount of river basin sewage or urban sewage will be discharged into river waters. Therefore, it is urgent to protect water resources in river basins. The rain and sewage diversion system is adopted in our country's current river basins, but most of them are still the drainage system of the combined rain and sewage, and a lot of combined sewage is directly discharged into the water body. However, changing the old confluence system to a diversion system is greatly restricted by the current conditions. Many old river basins have been built for a long time, underground pipelines have basically formed, ground buildings a...

AI Technical Summary

Problems solved by technology

In addition, since PVA is viscous, PVA will accelerate clogging (fouling) of the separation membrane in a short time

Such clogging of the separation membrane causes an increase in the pressure difference between the upstream side and the downstream side of the separation membrane, deteriorating the filtration characteristics

In addition, undecomposed PVA and other pollutants will also flow into the treated water, resulting in a decrease in the quality of the treated water

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