Method for realizing deep decarbonization and denitrification through treating sludge digested fluid of municipal sewage plant by adopting semi-short-range nitrification-anaerobic ammonium oxidation-electrooxidation

Abstract

The invention relates to a method for realizing deep decarbonization and denitrification through treating sludge digested fluid of a municipal sewage plant by adopting semi-short-range nitrification-anaerobic ammonium oxidation-electrooxidation and belongs to the technical field of denitrification and decarbonization of the sludge digested fluid. Anaerobic ammonium oxidation is realized in a SBR (Sequencing Batch Reactor), and then, the autotrophic denitrification of the sludge digested fluid is realized; the deep removal of ammonia nitrogen and total nitrogen from the sludge digested fluid isrealized through the anaerobic ammonium oxidation without additionally adding a carbon source; refractory organic matters are deeply removed from the sludge digested fluid through electrooxidation toachieve deep denitrification, and thus, the problems of merged treatment of the sludge digested fluid that the quality of yielding water of the sewage plant is lowered, and independent treatment is high in cost are solved. Through SBR-EO combination, anaerobic ammonium oxidation denitrification is achieved in the SBR, refractory matters in the yielding water are degraded in an electrooxidation reactor through hydroxyl free radicals with high oxidizability produced on an anode, and thus, the economical efficient decarbonization and denitrification of the sludge digested fluid are achieved. Concentrations of the organic matters, total nitrogen and ammonia nitrogen of final effluent are only 60 to 80, 8 to 12 and 20mg/L to 30mg/L, and the removal rate of each of the organic matters, total nitrogen and ammonia nitrogen reaches up to 95% or more.

Description

technical field [0001] The invention relates to a method for advanced treatment of sludge digested liquid, belonging to the technical field of denitrification and carbon removal of sludge digested liquid. This process is equipped with a raw water tank, a sequencing batch reactor (SBR) and an electro-oxidation (EO) device, and an aeration device and a mechanical stirring device are provided in the SBR. Through the realization of anaerobic ammonium oxidation in SBR, the autotrophic denitrification of sludge nitrification liquid is realized, and the effluent flows through the electro-oxidation device to realize deep carbon removal. The present invention is suitable for deep carbon removal and denitrification treatment of sludge digestion liquid, without adding external carbon source to realize the deep removal of ammonia nitrogen and total nitrogen in sludge digestion liquid through anaerobic ammonium oxidation; deep removal of sludge digestion liquid through electro-oxidation T...

AI Technical Summary

Problems solved by technology

The semi-short-cut nitrification-anammox, that is, one-stage anammox, is realized through the SBR process, without adding any carbon source for deep denitrification, which solves the need for denitrification and denitrification of high-ammonia nitrogen sewage such as sludge digestion liquid in the past. The key problem of high cost of adding carbon sources

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