Process and system for carrying out high-efficiency denitrification and dephosphorization treatment on urban sewage

Abstract

The invention belongs to the technical field of sewage treatment and particularly relates to a process and a system for carrying out high-efficiency denitrification and dephosphorization treatment on urban sewage. The process for carrying out high-efficiency denitrification and dephosphorization treatment on the urban sewage is characterized in that the process comprises the following steps that the pretreated urban sewage directly enters an anaerobic tank to be subjected to anaerobic hydrolysis; then the obtained product enters an anoxic tank and an aerobic tank to be subjected to denitrification, nitration and aerobic biodegradation; and finally the product enters a sedimentation tank to be subjected to solid-liquid separation and then is discharged. The process integrates anaerobic treatment, anoxic treatment and aerobic treatment into one whole body. The organisms, nitrogen and phosphorus are removed by a biochemical reaction principle. The system for carrying out high-efficiency denitrification and dephosphorization treatment on the urban sewage has a simple structure and a reduced occupied area.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment process for efficient denitrification and dephosphorization of urban sewage and a treatment system thereof. Background technique [0002] With the acceleration of China's industrialization process, the problem of environmental pollution has become more and more prominent, especially the continuous discharge of excessive nitrogen and phosphorus-rich sewage into water bodies will stimulate the excessive growth of plants and algae in the water, causing eutrophication of water bodies. As a result, the dissolved oxygen in the water drops sharply, a large number of fish die, and the water quality is seriously degraded, which in turn causes "algae bloom" in the freshwater body, that is, eutrophication of the water body. Eutrophication will affect the water quality of the water body and reduce the transparency of the water, making it difficult for sunligh...

AI Technical Summary

Problems solved by technology

[0005] The existing sewage treatment processes for biological nitrogen and phosphorus removal mostly use A / O, A 2 / O and oxidation ditch technology, the production practice has been widely used, and the technology is relatively mature, but it is still not ideal, such as large design capacity, relatively low processing capacity, and increased floor space and investment

In addition, in the case of large changes in water quality and quantity in actual production, it is difficult to ensure a stable depth of nitrogen and phosphorus removal

Currently, in A / O, A 2 In the series of denitrification and phosphorus removal processes developed on the basis of / O process and oxidation ditch process, most of the processes require simultaneous reflux of sludge and mixed liquor, which cannot achieve the purpose of energy saving, and it is difficult to simultaneously improve nitrogen and phosphorus removal Effect

Images