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

Abstract

The invention discloses a treatment method and device for nitrogen and phosphorus removal of rural domestic wastewater. The treatment method comprises the following steps: 1) collecting the domestic wastewater by utilizing a regulating tank and simultaneously performing water quantity homogeneous regulation; 2) degrading organic matters and removing nitrogen and phosphorus: controlling a biochemical reaction tank by utilizing a control system and performing water intake / drainage-anaerobic-aerobic step sequence operation on the wastewater entering the biochemical reaction tank to realize organic matter degradation and nitrogen and phosphorus removal; 3) performing sludge discharge treatment: adopting a forced sludge discharge method at the later aerobic stage, discharging activated sludge with high phosphorus content formed in the biochemical reaction tank at the later aerobic stage to a sludge tank for storage through a sludge pump and conveying to a sludge treatment plant for treatment through a sludge suction tanker regularly; and 4) draining clear water at the top of the biochemical reaction tank into a clear water tank in the water intake / drainage steps and discharging throughan efflux pump after the clear water in the clear water tank is sterilized by a sterilizing device. The method for the nitrogen and phosphorus removal of the rural domestic wastewater, disclosed by the invention, has the benefit that as moving equipment is less, the maintenance expense is low, and the running expense is lower than 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 to the two indicators of total phosphorus and total nitrogen. Even if some processes use chemical phosphorus removal methods to make up for the substandard total phosphorus in the effluent, the use of chemical phosphorus removal not only increases operating costs, but also produces chemical sludge. Sludge Disposal Costs

Images