Deepness denitrogenation method for treating organic wastewater in high concentration

Abstract

This invention discloses a method for deep denitrification treatment of high-concentration organic wastewater. The apparatus comprises an anaerobic decarbonization zone, an aerobic nitrosation / anaerobic ammoxidation denitrification zone, and a traditional nitrification / denitrification zone. In the anaerobic decarbonization zone, an anaerobic bioreactor is utilized to perform anaerobic biotreatment on the organic pollutants in raw water to remove the majority of organic matters. In the aerobic nitrosation / anaerobic ammoxidation denitrification zone, ammonia nitrogen and nitrite nitrogen are removed in the form of nitrogen gas. In the traditional nitrification / denitrification zone, nitrate in the water discharged from the aerobic nitrosation / anaerobic ammoxidation denitrification zone is subjected to denitrification and removed in the form of nitrogen gas. Excess organic matters are subjected to aerobic bioreaction and removed. The method can ensure COD; total nitrogen and ammonia nitrogen contents in the treated water are qualified for discharge. The method has such advantages as high decarbonization and denitrification efficiency, low energy consumption, and high running stability.

Description

technical field [0001] The invention belongs to the field of wastewater biological treatment, in particular to a denitrification treatment method for high-concentration organic wastewater. Background technique [0002] With the continuous development of social economy, the pollution of water environment is also increasing, and the prevention and control of water pollution has received more and more attention. The wide application of biological treatment technology, especially the development of anaerobic biological technology, has achieved good results in the removal of organic matter in wastewater. However, there is still no feasible and reliable technology for the treatment of nitrogen in high-concentration organic wastewater. Most of them still only have certain removal of ammonia nitrogen, and the deep removal of total nitrogen has not been well solved. In recent years, with the increasing control of nitrogen entering the receiving water body, people began to pay attent...

AI Technical Summary

Problems solved by technology

However, in practical industrial applications, since the organic matter in the high-concentration organic wastewater is degraded to a greater extent in the anaerobic treatment stage, the carbon source of the aerobic denitrification biological treatment (denitrification stage) is insufficient, and the addition of organic carbon sources makes the The cost of sewage treatment is greatly increased, so the denitrification efficiency is not high, so the nitrogen content in the effluent of these two processes is still high, and the denitrification effect is limited

Moreover, a large amount of alkali needs to be consumed in the nitrification process (7.14g of alkalinity is required to oxidize 1g of ammonia nitrogen theoretically), which also increases the cost

[0004] The second method mainly includes anaerobic simultaneous denitrification methane production plus aerobic process, and anaerobic simultaneous denitrification methane production plus anaerobic carbon removal plus aerobic process. The denitrification should be realized in the anaerobic reactor. Complete nitrification or nitrosation must be achieved in the aerobic stage, and the power consumption is still large, and the denitrification efficiency of the whole process depends on the reflux ratio from the nitrification liquid in the aerobic stage to the anaerobic stage. The reflux ratio of the required nitrifying liquid is also higher, and an excessively high reflux ratio will bring significant adverse effects on the anaerobic reaction stage and affect the treatment effect of the whole process

[0007] From the above analysis, it can be seen that there is currently no efficient, reliable, energy-saving, economical and stable process route for the deep denitrification treatment of high-concentration organic wastewater.

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