Sewage treatment method and system in ecological sensitive areas

Abstract

The invention discloses a sewage treatment method and a system in ecological sensitive areas. The method comprises the following steps: larger suspended matters in sewage are removed by using a collecting well the inlet of which is provided with a mechanical coarse screen, the treated sewage enters a pretreatment tank, the suspended matters are further removed by the coarse screen, animal and vegetable oils and mineral oils are removed by an oil separator, and the retreated sewage enters a regulating reservoir to equalize the water quantity and water quality; the pretreated sewage enters an anaerobic tank to be mixed with backflow mixed liquor from an anoxic tank; effluent from the anaerobic tank and the backflow mixed liquor from a membrane pool are mixed to enter the anoxic tank, and effluent from the anoxic tank enters an aerobic tank; effluent from the aerobic tank enters the membrane pool to be biodegraded; and the effluent is filtered by membranes. By adopting an anaerobic-anoxic-aerobic-MBR mode, the invention has higher treatment efficiency and stability and can effectively remove COD, BOD, TN, TP and oils in the sewage; and the effluent meets first grade A emission requirements, and can be used as a reuse water source, thereby protecting the environment and saving the water resources. The invention is especially suitable for treating rural domestic sewage and catering wastewater in the ecological sensitive areas.

Description

technical field [0001] The invention relates to an integrated MBR (Membrane Bioreactor, membrane bioreactor) treatment method and system for domestic sewage and catering wastewater treatment in ecologically sensitive areas. Background technique [0002] Ecologically sensitive areas refer to sandstorm source areas, oases in deserts, areas with severe water shortages, rare animal and plant habitats or special ecosystems, natural forests, tropical rainforests, mangroves, coral reefs, fish and shrimp spawning grounds, important wetlands and natural fishery etc. Ecologically sensitive areas have precious water resources to maintain the survival of special species. In these areas, the water quality requirements for discharged sewage are high or zero discharge is required, and water resources are scarce, so the demand for sewage recycling is obvious. Therefore, it is particularly important to prevent the pollution of sewage to discharge water resources in the protection of ecolog...

AI Technical Summary

Problems solved by technology

Although the constructed wetland has a good landscape effect, there are also many shortcomings: its construction occupies a large amount of land area, which has a non-negligible impact on my country's lack of land resources; In particular, it has a very significant and long-term impact on the recultivation of the project construction area; the management system of the constructed wetland is not perfect, so that after the construction of the constructed wetland, many of them have become a burden to the local government

[0006] The existing MBR treatment system is mainly aimed at the treatment of urban sewage. In view of the obvious differences in the characteristics of urban sewage and rural sewage, it is often unreasonable to use relevant design and operation data to guide the construction of rural sewage treatment systems. It is necessary to investigate and analyze the characteristics of rural drainage. Regional characteristics, collection methods, and changes in sewage water volume and water quality, etc., to obtain basic data combined with rural living habits, and finally determine the parameter design of the treatment system

At present, there are no design parameters and operating parameters of an integrated MBR treatment system that combines the treatment characteristics of rural sewage in ecologically sensitive areas in my country.

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