Wastewater nitrogen removal treatment system and nitrogen removal treatment process

Abstract

The invention provides a wastewater nitrogen removal treatment system. The wastewater nitrogen removal treatment system comprises a water collection tank, an aeration tank, a coagulation tank, a floatation tank, an MBR (Membrane Bioreactor) tank, a recovered water tank and a ferrous sulfide filtering bed which are connected in series in sequence through a pipeline, wherein the MBR tank comprises an MBR-A1 reaction tank for carrying out an anaerobic reaction, an MBR-O1 reaction tank and an MBR-O2 reaction tank for carrying out an aerobic reaction, an MBR-A2 reaction tank and an MBR-A3 reaction tank for carrying out an anaerobic reaction, and an MBR-F reaction tank for carrying out an aerobic reaction which are connected in series in sequence through a pipeline; the floatation tank communicates with the MBR-A1 reaction tank through a pipeline; the MBR-F reaction tank communicates with the recovered water tank; the MBR-O1 reaction tank, the MBR-O2 reaction tank and the MBR-F reaction tank communicate with a No.2 air blower. In the nitrogen removal treatment process, a process flow of anaerobic-aerobic-aerobic-anaerobic-anaerobic-aerobic is adopted, so that the total content of nitrogen and phosphorus in wastewater is lowered effectively, the total content of the phosphorus is lowered further through the ferrous sulfide filtering bed, and the wastewater is discharged to the standard.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a denitrification treatment process of a waste water denitrification treatment system. Background technique [0002] Nitrogen and phosphorus are the main elements that cause eutrophication in natural water bodies, so the removal of nitrogen and phosphorus in sewage has become the two main tasks of sewage treatment plants. At present, domestic sewage treatment plants have generally implemented the first-level A standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), in which the total nitrogen concentration must not exceed 15mg / L, and the total phosphorus concentration must not exceed 0.5mg / L. In recent years, many regions in my country have begun to implement more stringent local sewage treatment standards. For example, the A standard in the "Beijing Local Water Pollution Discharge Standard" (DB11 / 307-2013) reduc...

AI Technical Summary

Problems solved by technology

In order to achieve the stable compliance of the total nitrogen and total phosphorus of the first grade A standard, most sewage treatment plants need to add phosphorus removal chemicals, which greatly increases the operating cost

In addition, because phosphorus removal agents are expensive and will significantly reduce the service life of advanced treatment equipment such as filter cloths or turntables, it will undoubtedly indirectly increase the operating costs of sewage treatment plants

In particular, the nitrogen content in waste water is high and exists in complex forms, so it is difficult to treat, there is no special treatment equipment, and the simple anoxic-aerobic process is difficult to make the effluent discharge up to the standard

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