Method for performing biological denitrification nitrogen removal by taking LDHs as slow-release carbon source

Abstract

The invention discloses a method for performing biological denitrification nitrogen removal by taking LDHs as a slow-release carbon source. The layered double hydroxides serve as slow-release carbon source materials of a matrix and can be used as a carbon source supplement in the biological denitrification nitrogen removal process of sewage. The slow-release carbon source materials are composed of the LDHs intercalated with acetate moieties, and the denitrification carbon source which can be controllably and slowly released is synthesized through the anionic exchangeability of the LDHs and the property that the surface carries positive charges. The synthesized slow-release carbon source materials have the good mechanical property and biocompatibility, can gather microorganisms, increase the biomass of the unit area and improve the nitrogen removal rate and are suitable for the biological denitrification process of the sewage with the low carbon nitrogen ratio, the 6-h nitrogen removal efficiency is more than 96 percent, the effluent TOC is smaller than 5.5 mg / L, and the secondary pollution problem caused when an external carbon source is directly put can be effectively avoided. Accordingly, Ac-LDH can become a novel slow-release carbon source material with the great potential.

Description

technical field [0001] The invention relates to a treatment method for nitrogen-containing wastewater, in particular to a sewage biological denitrification denitrification treatment process, which is applied in the technical field of microbial water treatment. Background technique [0002] Nitrogen in sewage is one of the main factors causing water eutrophication. Biological denitrification is an effective method to remove nitrogen in sewage, but it needs sufficient carbon source. The carbon-to-nitrogen ratio of urban sewage in my country is low, and the biological denitrification process of sewage with low carbon-to-nitrogen ratio reduces the denitrification efficiency due to insufficient carbon sources in sewage. With the improvement of sewage discharge standards, the contradiction of insufficient carbon sources in the biological denitrification process has become increasingly prominent. Methanol, glucose, etc. are often added to sewage as supplementary carbon sources to ...

AI Technical Summary

Problems solved by technology

Methanol, glucose, etc. are often added to sewage as supplementary carbon sources to ensure high nitrogen removal efficiency. However, adding these carbon sources not only increases the cost of sewage treatment, but also makes it difficult to control the process of carbon source addition, resulting in insufficient carbon source addition. Or excessive, but also cause complex system operation and secondary pollution problems