Device and method for realizing sludge digestive fluid advanced nitrogen removal by three-section type short-cut nitrification-anaerobic ammonia oxidation-short-cut denitrification process

Abstract

The invention discloses a device and a method for realizing sludge digestive fluid advanced nitrogen removal by a three-section type short-cut nitrification- anaerobic ammonia oxidation-short-cut denitrification process. Sludge digestive fluid firstly enters a short-cut nitrification reactor, residual nitrite from the last cycle is removed by sufficiently utilizing organic substances in the digestive fluid through anoxic stirring and then aeration is performed to carry out partial nitrification; effluent containing nitrite is mixed with another part of the sludge digestive fluid to obtain a mixture, the mixture enters an anaerobic ammonia oxidation reactor for denitrification, and effluent enters the short-cut denitrification reactor, so that nitrate generated in an anaerobic ammonia oxidation reaction process is converted into nitrite, and the nitrite flows back into the anaerobic ammonia oxidation reactor so as to be further removed together with ammonia nitrogen in raw material. According to the device and the method, excessive nitrate in the effluent of the anaerobic ammonia oxidation reactor is reduced into a substrate nitrite needed for anaerobic ammonia oxidation reaction; and moreover, carbon source consumption is low, sludge yield is low, and a three-section type reactor can beflexibly controlled, and is suitable for advanced nitrogen removal of wastewater with high ammonia nitrogen and a low carbon-nitrogen ratio.

Description

technical field [0001] The invention relates to a deep denitrification technology of sludge digested liquid with low carbon-to-nitrogen ratio, which belongs to the technical field of biological treatment of high-ammonia-nitrogen wastewater. Specifically, a part of sludge digested liquid first enters a short-range nitrification reactor, and the sludge is fully utilized through anoxic stirring The organic matter in the digestive juice will remove the residual nitrite from the previous cycle, followed by aeration for short-range nitrification, the effluent containing nitrite and another part of the digestive juice will enter the anaerobic ammonium oxidation reactor for denitrification, and the effluent will then enter the short-range denitrification reactor , convert the nitrate produced in the anammox reaction process into nitrite, and then return it to the anammox reactor for further removal, so as to realize the deep denitrification of the sludge digestion liquid. This method ...

AI Technical Summary

Problems solved by technology

However, the problem with this process is that the anammox bacteria will also produce a certain amount of nitrate nitrogen (formula 1) during the process of converting ammonia nitrogen and nitrite nitrogen into nitrogen, especially in the treatment of high ammonia nitrogen wastewater (such as sludge When digesting juice), the effluent often contains a large amount of nitrate nitrogen, which requires further treatment before it can be discharged

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