Process and device for sewage nitrogen and phosphorus removal integrating physical and biochemical filtration

Abstract

The invention discloses a process and device for sewage nitrogen and phosphorus removal integrating physical and biochemical filtration. The device is formed by a physical filtering tank, a hypoxia denitrification biological filter / an aerobic nitrification biological filter denitrification system, a phosphorus removal adsorption filtration reaction system and a PLC control system. Sewage enters the physical filtering tank, outflow water of the physical filtering tank can first enter the hypoxia denitrification biological filter / the aerobic nitrification biological filter denitrification system to be denitrified, and outflow water enters the phosphorus removal adsorption filtration reaction system to be dephosphorized thoroughly; or outflow water first enters the phosphorus removal adsorption filtration reaction system to be dephosphorized and then enters the hypoxia denitrification biological filter / the aerobic nitrification biological filter denitrification system to be denitrified; sewage having been denitrification and dephosphorized enters a clear water area and finally flows into a disinfecting tank, and the sewage is disinfected and discharged. According to the process and device, a phosphorus removal chemical does not need to be added, phosphorus in the sewage can be removed, the process is short, the investment cost is reduced, the operation cost is low, and sludge is treated easily.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and relates to a sewage denitrification and phosphorus removal process and device integrating physical and biochemical filtration. Or the domestic sewage treatment in the community has reached the national "urban sewage treatment plant pollutant discharge standard" (GB18918-2002) level A standard. Background technique [0002] For a long time, my country's sewage treatment has always paid attention to the degradation control of organic matter in sewage, and in recent years, it has especially strengthened the control of the degradation of "nitrogen" and "phosphorus" pollutants that cause eutrophication in water bodies. Requirements to meet the "urban sewage plant pollutant discharge standards" (GB18918-2002) level A standard. At present, most of the urban sewage plants, especially those in the southern region, have a combined rain and sewage system, and due to poor geological conditions, the pipeli...

AI Technical Summary

Problems solved by technology

However, with the input of chemicals, a large amount of organic matter in raw water is removed, which virtually reduces the amount of carbon sources available for denitrification, resulting in insufficient carbon sources and the need for additional carbon sources. At the same time, it is difficult to treat and dispose of the chemical sludge formed. will significantly increase the cost of water treatment

Therefore, for the biofiltration process mainly based on biofilter, how to ensure its normal operation, the control requirements for fibrous substances and the demand for carbon sources; Phosphorus removal instead of chemical phosphorus removal in the process, all of which directly affect the application and promotion of biological filters

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