Device for autotrophic nitrogen removal of composite biological membrane and operation method

Abstract

The invention discloses a device for autotrophic nitrogen removal of a composite biological membrane and an operation method. The device comprises a water inlet tank, an anoxic reactor, a first aerobic reactor, a second aerobic reactor, a third aerobic reactor, a fourth aerobic reactor and a settling pond which are communicated in sequence, wherein the inlet water in the water inlet tank is in communication with digested sludge dehydrating liquid of an urban sewage treatment plant, and the outlet water is in communication with the anoxic reactor; a sludge discharging pipe and a valve are arranged at the bottom part of the settling pond and are communicated with a sludge return pump and the anoxic reactor; a stirring device is arranged in the anoxic reactor; fixed fillers and aerating heads communicated with air compressors are placed in the first aerobic reactor, the second aerobic reactor, the third aerobic reactor and the fourth aerobic reactor; and a clean water overflowing port is formed in the settling pond. The operation method comprises the following steps: 1) inoculating sludge, culturing, and accessing an active sludge adaptive phase; 2) starting short-term nitratlon reaction; 3) implementing anaerobic ammonia oxidation; and 4) accessing a short-term nitration-anaerobic ammonia oxidation smooth operating phase. The device is applicable to denitriding of high-ammonia nitrogen sludge dehydrating solution in sewage treatment, and is perfect in structure, simple in operation, high in denitriding effect, and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of biochemical sewage treatment, in particular to a device and a method for treating waste water with high ammonia nitrogen by using a biofilm whole-process autotrophic denitrification technology. The device uses fixed packing as a carrier to enrich anammox bacteria, and realizes economical and efficient denitrification through the organic synergy of ammonia oxidizing bacteria and anammox bacteria. This process is suitable for the treatment of high ammonia nitrogen digested sludge dehydration liquid in urban sewage treatment plants, and also suitable for the treatment of industrial wastewater with high ammonia nitrogen and low carbon nitrogen ratio. Background technique [0002] The removal of nitrogen pollutants has become a key issue in wastewater treatment and recycling. my country's "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) promulgated in 2002 requires that the effluent...

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Problems solved by technology

②The biofilm system is generally in a state of complete mixing, the concentration of ammonia nitrogen in the system is low, and there is no favorable condition for maintaining stable short-term nitrification; in this case, nitrite oxidizing bacteria will gradually enrich, thereby increasing the concentration of nitrate nitrogen in the effluent , to reduce the total nitrogen removal rate of the system

[0005] In summary, the problems to be solved in the popularization and application of treating high ammonia nitrogen wastewater include: how to effectively retain and enrich the anammox bacteria in the reactor; Coordinate the mutual ratio of different strains in the reactor to improve the stability of the reaction operation; how to reduce the complexity of system operation and maintenance

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