Research progress of iron-type denitrification removal technology
YU Yan1, LIU Ning1, LIAO Zu-gang1, ZHAO Jian-qiang1,2, ZHANG Qian-qian1,2
1. School of Water and Environment, Chang'an University, Xi'an 710054, China; 2. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang'an University, Xi'an 710054, China
Abstract：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.
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