铁型反硝化脱氮技术研究进展

传统反硝化工艺是非常有效的废水脱氮技术,具有反应快、效率高等优点,但受废水中有机碳源浓度影响较大.废水中碳源不足不能满足生物反硝化脱氮的需求且会导致总氮(TN)去除率偏低,而投加外源有机碳源会提高处理成本,极易造成二次污染,因而传统反硝化工艺对低碳氮比(C/N)废水脱氮处理具有一定局限性.铁型反硝化脱氮技术作为自养反硝...

Research progress of iron-type denitrification removal technology

Traditional denitrification process with the advantages of fast reaction and high efficiency is a very effective nitrogen removal technology for wastewater treatment, but it is greatly affected by the concentration of organic carbon source in wastewater. The lack of carbon source in wastewater can not meet the requirements of biological denitrification and lead to a lower total nitrogen (TN) removal rate, and the addition of exogenous organic carbon source will increase the treatment cost and easily cause secondary pollution. Therefore, the traditional denitrification process has certain limitations on the nitrogen removal treatment for low C/N wastewater. As one of the autotrophic denitrification technologies, iron-type denitrification technology has the advantages of higher nitrogen removal efficiency, lower operation cost and the product has recycling value, which can effectively solve the shortcomings of traditional heterotrophic denitrification. The sources and harm of nitrate wastewater were summarized, and the reaction mechanism of iron-type denitrification process was elucidated. The effects of pH, temperature and molar ratio of iron to nitrogen (Fe/N) on the denitrification efficiency of iron-type autotrophic denitrification were discussed, and the performance strengthening measures of iron-type denitrification system were summarized.