改性纳米铁/炭填充PRB去除地下水硝态氮研究

SM-nano iron/carbon filling in PRB for nitrate nitrogen removal in groundwater

采用鼠李糖脂对纳米铁进行改性后负载在活性炭上制备出改性纳米铁/炭,将其作为PRB填充材料,并采用有机玻璃柱模拟连续墙式PRB来进行水中硝态氮地去除研究.结果表明:经过改性后的纳米铁能够有效负载在活性炭上,悬浮稳定性得到明显提高;改性纳米铁/炭粒径远大于纳米铁,将其作为填充材料可有效缓解PRB堵塞问题;当纳米铁与活性炭质量比为5:2时,PRB运行效果最佳;pH值越小,污染液硝态氮浓度越低,水流速度越小均有利于硝态氮地去除.

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.