SM-nano iron/carbon filling in PRB for nitrate nitrogen removal in groundwater
GAO Yang-yang, LIU Guo, CHEN Chun-mei, XU Xiong-kun, CHEN Zheng-yang
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Sichuan Provincial Environmental Protection key Laboratory of Groundwater Pollution Prevention and Resource Security, College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China
Abstract：In this study rhamnolipid was selected to modify Nano Iron, attaching to activated carbon to constitute SM-nano iron/carbon, and took it as PRB filling material. The organic glass column was used to simulate the continuous wall PRB to study on removal of nitrate nitrogen in the water. Experimental results showed that the modifying Nano Iron could effectively load on the activated carbon, and its suspension stability were greatly improved; the particle size of SM-nano iron/carbon was much larger than Nano iron, it can effectively alleviate the PRB pore spacing blocking; When nano iron and activated carbon quality ratio was 5:2, the running effect of PRB was the best; Lower pH, initial nitrate nitrogen concentration and the velocity of water were favorable of removal of nitrate nitrogen in water.
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