Treatment method and device for nitrogen and phosphorus removal of rural domestic wastewater

Abstract

The invention discloses a treatment method and device for denitrification and dephosphorization of rural domestic sewage, wherein the method comprises: 1) using a regulating tank to collect domestic sewage, and at the same time adjusting the water volume homogeneously; 2) degrading organic matter and denitrifying and dephosphorizing , use the control system to control the biochemical reaction tank to run the steps of water intake/drainage-anoxic-aerobic sequence for the sewage entering the interior, so as to realize the degradation of organic matter and the removal of nitrogen and phosphorus. 3) Sludge treatment, in the late stage of aerobic stage The method of forced sludge discharge is carried out, and the activated sludge with high phosphorus content formed in the late aerobic stage in the biochemical reaction tank is discharged to the sludge tank for storage through the sludge pump, and is regularly sent to the sludge treatment plant by the suction tank truck for treatment; 4 ) In the water inlet/drainage step, the clear water at the top of the biochemical reaction tank is discharged to the clear water tank, and the clear water in the clear water tank is discharged by the external discharge pump for use after passing through the disinfection device. The method for denitrification and dephosphorization of domestic sewage in rural areas has less moving equipment and low maintenance cost, and the operating cost is as low as 0.25 yuan/ton.

Description

technical field [0001] The invention relates to a sewage treatment method and device, in particular to a method and device for denitrification and phosphorus removal of rural domestic sewage. Background technique [0002] Due to rural living habits and groundwater and rainwater being used for sewage treatment systems through sewage collection pipe networks, the concentration of organic matter (that is, carbon source) is low, and nitrogen and phosphorus exceed the standard (cannot meet C:N:P=100:5:1, that is, C / N< 20, C / P<100), while excessive nitrogen and phosphorus elements will accelerate the eutrophication of water bodies and bring great harm to the livable living environment of rural residents. The increase of nutrients such as nitrogen and phosphorus will cause a large number of algae to multiply, and in severe cases, it will cause algal blooms or red tides, among which phosphorus plays a key role. Therefore, how to reduce the phosphorus content in domestic sewag...

AI Technical Summary

Problems solved by technology

Although these two methods have accelerated the pace of rural domestic sewage treatment to a certain extent, they have not considered the actual situation in rural China. The water quality and quantity vary greatly in four seasons, which causes the water quality of most equipment to fail to meet the requirements. Refers

Images