Anoxia, drop aeration, artificial wetland combination type small-scale sewage dephosphorizing and denitrifying method

Abstract

A method of phosphorous removal and denitrification for small-sized wastewater combined with anaerobic, dropping oxygenating and artificial wetland, firstly introducing the wastewater into feeding tank(1), then into anaerobic tank(2), and entering into the dropping oxygenating contact oxidation tank through discharging tank(3) by water pump, and finally into the artificial wetland(5); the dropped biological membrane in the dropping oxygenating contact oxidation tank(4) is discharged into anaerobic tank(2) through sludge pipe(6); prolonging the anaerobic tank(2) retention time if the organic matter concentration of the inletting water is high and shortening the retention time if the concentration is low, reducing the organic matter concentration to be below 100mg / l by anaerobic action; the dropping oxygenating contact tank(4) is cascaded to two-tank or four-tank form. The method in this invention reduces the running cost.

Description

technical field [0001] The invention is mainly used for the treatment of small-scale domestic sewage in villages and towns, and is also suitable for the treatment of small-scale domestic sewage in units that cannot utilize urban sewers, and belongs to the technical field of environmental protection water treatment. Background technique [0002] At present, the technologies used for small-scale domestic sewage treatment in rural areas mainly include septic tanks, land treatment and stabilization ponds, activated sludge and biofilm methods. Although septic tanks can greatly reduce the concentration of suspended solids, it is still difficult for the effluent to meet the comprehensive sewage discharge standards. The non-powered sewage treatment device improved by septic tank has high civil construction cost, cannot adapt to the fluctuation of water quality and water quantity during operation, and it is difficult to guarantee the quality of effluent water. There are many forms o...

AI Technical Summary

Problems solved by technology

Although the septic tank can greatly reduce the concentration of suspended solids, the effluent is still difficult to meet the comprehensive sewage discharge standard

The non-powered sewage treatment device improved by septic tank has high civil construction cost, cannot adapt to the fluctuation of water quality and water quantity during operation, and it is difficult to ensure the quality of effluent water

There are many forms of land treatment, such as slow filtration, fast filtration, wetland, etc., but they occupy a large area; stabilization ponds are also easily affected by climate, so it is difficult to popularize

Although the activated sludge method and the biofilm method can achieve good treatment effects, they will cause various problems in operation and management.

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