A nitrification biological denitrification carrier

Abstract

The invention discloses a nitrification biological denitrification carrier, which comprises the following components and weight ratio: polyether polyol 100, polyisocyanate 20-62, silicone surface active stabilizer 1-3, active foaming agent 3-30 , water 4-8, tertiary amine catalyst and / or organometallic catalyst 0.5-0.6. The present invention realizes low preparation cost, good removal effect on target pollutants in high ammonia nitrogen sewage, nitrification-denitrification process occurs in the same aerobic pool, and the reaction is only controlled in the same aerobic pool In the nitrosation stage, no nitrification reaction occurs, which effectively reduces infrastructure investment and operating costs.

Description

technical field [0001] The invention relates to the field of new materials for sewage treatment, in particular to a nitrification biological denitrification carrier. Background technique [0002] Today's environmental degradation, population expansion, and resource shortage are listed as three major worldwide problems that hinder the sustainable development of human society. Coal, petrochemical, tanning and other industries with high ammonia nitrogen sewage have become increasingly serious pollution to the water environment. At present, no treatment technology that is truly suitable for my country's national conditions has been found in China. As far as the existing process technology is concerned, either the operating cost is too high or the process technology is immature, resulting in most high-ammonia-nitrogen sewage treatment plants not operating normally. The pollution indicator ammonia nitrogen Most of the total nitrogen and total nitrogen are discharged beyond the sta...

AI Technical Summary

Problems solved by technology

There have been reports on short-range nitrification-denitrification technology, which controls the nitrification reaction process to produce NO from ammonia oxidation. 2 - stage, blocking the NO 2 - further oxidation, directly to NO 2 - As the hydrogen acceptor of bacterial respiratory chain for denitrification, the accumulation of nitrite must be realized in this process to prevent the reproduction of digestive bacteria. Due to the limitation of control conditions, the application is still in the laboratory research or small test. At present, there is no report on engineering application, and to achieve the purpose of denitrification through the above two methods, the operating cost is particularly high

Either add organic carbon (methanol, etc.) in the denitrification stage or have a considerable amount of nitrifying liquid backflow, such as simple urban domestic sewage, the total nitrogen is about 50mg / L, if you want to use the traditional denitrification technology to solve the total nitrogen, Then the reflux ratio of the nitrifying liquid should be at least 200%, not to mention the industrial sewage containing a high concentration of ammonia nitrogen, not only a larger tank capacity, but also more lifting equipment and its supporting mixing system. , pipelines, etc., the capital investment is relatively large, but the removal of total nitrogen is not ideal

[0004] At present, the main reason for large-scale cyanobacteria and algae bloom pollution in most rivers and lakes in China is the removal of ammonia nitrogen in sewage in the past, using traditional methods or reliable new technology to convert ammonia nitrogen only to nitrite It is directly discharged into the receiving water body after the stage of nitrate or nitrate, and some technologies even have almost no process of converting ammonia nitrogen into nitrite or nitrate

[0005] There is also a whole-process autotrophic biological denitrification technology in terms of the inside and outside of a single biofilm, which is feasible in principle, but the actual removal rate of total nitrogen is quite low. There is almost no generalization value for industrial applications, because there is no calculation basis for its rational use so far

[0006] To sum up, the traditional biological denitrification technology and the new biological denitrification technology reported in the data are theoretically feasible, but there are still certain defects or deficiencies in real industrial application, or the operating cost is too high , the burden on the enterprise is too heavy, or it is still in the laboratory research stage, there is no reliable calculation basis and design basis for reference

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