Method for one-step denitrification by utilizing wood and decayed wood for enrichment of denitrification environment microbial communities

Abstract

The invention discloses a method for one-step denitrification by utilizing wood and decayed wood for enrichment of denitrification environment microbial communities. The method includes: S1, soaking the decayed wood by a hydrochloric acid solution with a concentration of 9-10% for 20-30h continuously, then getting the decayed wood out and washing it clean; S3, soaking the decayed wood in a basic inorganic salt solution for 28-32d; and S5, placing the decayed wood in a denitrification pool in an anaerobic ammonia oxidation environment to perform bacteria culture, and keeping the temperature inside the pool at 20-30DEG C, introducing sewage into the pool, letting microbial communities grow on the decayed wood gradually, and making the Delta-proteobacteria composition proportion reaches over 50%, thereby realizing one-step denitrification. The decayed wood is employed to provide a parasitic environment for anaerobic bacteria, and increases the survival property and reproduction speed. The denitrification process has no need for chemical or organic matters, and aeration. The dominant environment microbial communities for denitrification are formed on the surface of the carrier, bacteria are cultured to swallow nitrogen-containing substances in flowing sewage so as to reach decontamination, thus saving raw materials, manpower and material resources, and reducing the cost.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for removing total nitrogen in sewage by using natural organic filler wood as the raw material of the main culture source to cultivate special bacteria in an anammox environment, and in particular to a method for removing total nitrogen in sewage by using wood and decayed wood. One-step denitrification method. Background technique [0002] There are a lot of nitrogen-containing pollutants in modern industrial and domestic sewage, which can easily lead to eutrophication of water bodies and seriously endanger the environment. Currently, the most commonly used denitrification technology is nitrification and denitrification. Nitrification and denitrification denitrification technology requires a higher aeration rate to meet the reaction of ammonia oxygen conversion to nitrate, and when the organic matter content is low, an additional organic carbon source needs to be ...

AI Technical Summary

Problems solved by technology

However, anammox microorganisms can only be active under high concentration conditions, and anammox microorganisms grow slowly, are difficult to cultivate, and their activity is easily inhibited

Therefore, in order to maintain the activity of anammox microorganisms, a high cost is required

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