Sewage treatment method suitable for hilly small towns

Abstract

The invention relates to a sewage treatment method, which is applicable to the west area where the economic technology is comparatively backward and hilly small towns in Yangtze River Valley. The sewage passes through a grating and large suspensions are removed, then the sewage enters an anaerobic biological reaction tank, most solid suspensions and partial organic substances are removed, the effluent carrying oxygen in the air falls through multi-level from the elevation and flows into a water fall aeration tank at the lower part, and a part of the organic substances is removed; then the effluent enters an artificial rapid infiltration system, and pollutants such as the organic substances, nitrogen, phosphorus and the like are removed through the processes of interception, filtration, adsorption, nitration, denitrification and the like of a soil ecosystem; and finally, through ultraviolet disinfection, the effluent is discharged after reaching standards. The method has the characteristics of low energy consumption and expense, simple operation, maintenance and management, little sludge yield, good treatment effect, and the like.

Description

technical field [0001] The invention belongs to the field of municipal and environmental protection engineering, and specifically relates to a new combined sewage treatment process of anaerobic biological treatment-falling water aeration-artificial rapid infiltration land treatment, which is especially suitable for small towns in mountainous areas. Background technique [0002] In the past 10 years, a large number of sewage treatment plants have been built in small towns across the country, and sewage biological treatment technology is the core technology of urban sewage treatment. Comprehensively considering the characteristics of small town sewage water volume and water quality, economic and social conditions and environmental requirements of small towns, the commonly used sewage treatment processes mainly include ordinary activated sludge process, SBR process, oxidation ditch process and A 2 / O process, etc., are also the leading technologies adopted by developed countrie...

AI Technical Summary

Problems solved by technology

However, at present, quite a few small town sewage treatment plants are not in good condition, especially in the economically underdeveloped western regions and small town sewage treatment plants in the Three Gorges Reservoir area

From the analysis of the process itself adopted by the sewage treatment plant, there are mainly the following problems: ①The energy consumption for operation is too high

②Complicated operation management

[0003] In fact, there are also anaerobic biological treatment technology and artificial rapid infiltration land treatment technology suitable for small towns, but neither of them can be used alone as a sewage treatment technology for small towns.

This is because the effluent of the anaerobic biological treatment process is far from meeting the wastewater discharge standard, but it has a strong buffer capacity for sewage water quality and quantity, low investment, simple management, and low operating costs, and can be used as pre-treatment for sewage treatment in small towns; while artificial The rapid infiltration land treatment system has better treatment effect, low investment and low operating cost, but requires pre-treatment and occupies a large area

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