A method and device for deep nitrogen and phosphorus removal treatment of mixed wastewater of landfill leachate and domestic sewage

Abstract

The invention discloses a method and device for deep denitrification and dephosphorization of mixed wastewater of landfill leachate and sanitary sewage, and relates to the field of sewage biological treatment.Denitrification and dephosphorization reaction and organic matter removal are conducted in a sequencing batch reactor (SBR), during which ORP and pH are monitored and controlled in real time and phosphorus is removed through mud discharge, wherein 55-60% of output water of the SBR directly enters a BAF reactor to be subjected to short-cut nitrification, 40-45% of output water of the SBR and output water of the BAF reactor are mixed and then enter a UASB reactor to be subjected to anaerobic ammonia oxidation reaction, 50-55% of output water flows back into a third middle water tank after water discharge, and the rest of output water is discharged.By mixing landfill leachate and urban sanitary sewage, the problem that urban sanitary sewage cannot be stably subjected to short-cut nitrification due to low ammonia nitrogen concentration can be solved.Meanwhile, the carbon source in sanitary sewage is used for dual purposes in the SBR, phosphorus in sewage and nitrate nitrogen in backflow output water of the UASB reactor are both removed through the effect of denitrifying phosphorus removal, and the organic matter degradation aim is achieved.

Description

technical field [0001] The invention relates to the field of sewage biological treatment, in particular to a device and method for deep denitrification and phosphorus removal treatment of mixed waste water of landfill leachate and domestic sewage (the ratio of leachate and domestic sewage is 1:5-1:10). Background technique [0002] With the development of my country's economy and the improvement of people's living standards, the nitrogen and phosphorus elements contained in urban sewage in my country have gradually increased, resulting in serious water eutrophication. However, the existing sewage treatment technology is difficult to remove nitrogen and phosphorus in sewage cost-effectively. In the 1990s, the anammox process was first proposed. Since in the process of anammox, anammox bacteria can convert ammonia nitrogen and nitrite nitrogen into nitrogen without the participation of oxygen, the whole process is completely an autotrophic process. Therefore, compared with t...

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Problems solved by technology

[0004] In view of the above, the present invention provides a device and method that can economically and efficiently treat landfill leachate and domestic sewage to achieve deep nitrogen and phosphorus removal, and solve the problem that domestic sewage is difficult to apply anaerobic ammonia oxidation due to the difficulty of short-range nitrification. And the adverse effects of organic matter in landfill leachate on anammox

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