Denitrification method for sewage

Abstract

The invention discloses a denitrification method for sewage. The denitrification method comprises the following steps: (1) mixing a proper amount of montmorillonite powder with ephedrine and a nitration microbial agent and allowing nitrated microbes to be closely adhered on the surface of montmorillonite, wherein the nitration microbes and the montmorillonite are closely bonded to form an interaction body; (2) adding the interaction body into sewage in a nitration reaction tank, carrying out contact culture for 7 days under aerobic conditions and allowing ammonia nitrogen to fully undergo nitration, thereby converting ammonia nitrogen into nitrate nitrogen; (3) allowing sewage having undergone nitration to enter a denitrification reaction tank after precipitation and adding a denitrification bacterial agent for anaerobic denitrification; and (4) subjecting treated water obtained after denitrification to precipitation so as to realize nitrogen removal. The particle size of the montmorillonite is in a range of 50 to 1000 nm, and the addition amount of the montmorillonite is 0.001% to 0.005% of the mass of the sewage; the addition amount of the nitration microbial agent is 0.0001% to 0.0005% of the mass of the sewage; and the addition amount of the ephedrine is 0.002% to 0.006% of the addition amount of the nitration microbial agent.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for denitrification of sewage. Background technique [0002] With the eutrophication of water body becoming more and more serious, domestic sewage and industrial sewage discharge standards are becoming more and more stringent. GB8978-1996 clearly stipulates the maximum allowable concentration of the second type of pollutants: the primary discharge standard of ammonia nitrogen is <15mg / L . For the sewage industry with high ammonia nitrogen content, in order to meet the requirements of the first-level sewage discharge standard and above, if the traditional sewage denitrification treatment method is still used, there are still the following main disadvantages: high economic cost investment, complicated process and insufficient denitrification energy efficiency. [0003] The traditional denitrification methods such as A2 / O, A / O, etc., the principle of denitrification is m...

AI Technical Summary

Problems solved by technology

For the sewage industry with high ammonia nitrogen content, in order to meet the first-level sewage discharge standard and above requirements, if the traditional sewage denitrification treatment method is still used, there are still the following main disadvantages: high economic cost investment, complex process and insufficient denitrification energy efficiency

CN202007177 describes a denitrification method that adds two anoxic zones and fills the anoxic zone with biofillers and biofilms for denitrification, but this method not only complicates the treatment device and process, but also has high input costs, and the biofillers After all, biofilms have service life and residue treatment problems will cause secondary pollution, so they cannot be better used in large-scale sewage treatment

[0004] In the process of adding denitrification catalytic materials, CN1386822A describes a high-efficiency denitrification agent and denitrification method for removing nitrogen compounds from petroleum distillate oil, and CN1718689A describes a pretreatment method for lubricating oil hydroisomerization dewaxing raw materials. Treatment method, CN101525549 describes a method for ultra-deep adsorption desulfurization and denitrification of hydrocracking tail oil, etc. The disadvantages of these disclosed denitrification methods are: 1) The added denitrification materials are all difficult to prepare substances or will There are residues and will not automatically decompose; 2) The amount of addition is high; 3) The input cost is high; 4) The process and equipment are relatively complicated; 5) The service life of the added materials is limited and there is secondary treatment of waste after use. Produce secondary pollution, which is not conducive to environmental protection