吹脱—离子交换耦合工艺处理页岩提钒高浓度氨氮废水研究

Study on Treatment of High Concentration Ammonia Nitrogen Wastewater from Vanadium Shale Extraction by Stripping-Ion Exchange Coupling Process

利用吹脱法—离子交换耦合工艺处理钒页岩提钒高浓度氨氮废水,首先考察pH、温度、气液比体积比(L/L)对氨氮去除效果的影响,然后研究离子交换处理过程中废水pH、流速和串联级数对树脂吸附效果的影响,最后考察树脂循环稳定性能。结果表明,吹脱的最佳条件为pH=10.5、温度40℃、气液比3200,吹脱处理后氨氮浓度为1999.56mg/L。树脂合适的吸附pH为8,流速为9mL/min,两级串联吸附后氨氮去除率达99%以上。体积浓度18%的硫酸对氨氮的解吸率大于99%,经10次吸附解吸循环后,吸附性能稳定。

High concentration ammonia nitrogen wastewater from vanadium shale extraction was treated by air stripping-ion exchange coupling process.Firstly,effects of pH value,temperature and volume ratio of gas to liquid(G/L,L/L)on removal efficiency of ammonia nitrogen from vanadium precipitation wastewater were investigated.Secondly,effects of pH value,flow rate and series number on resin adsorption were studied.Finally,adsorption stability of resin for ammonia nitrogen was studied.The results show that the optimum conditions for stripping include pH value of 10.5,temperature of 40℃and G/L of 3 200,concentration of ammonia nitrogen is 1 999.56 mg/L after stripping.Suitable pH value of resin adsorption is 8 and flow rate is 9 mL/min.Ammonia nitrogen removal rate is 99%above after two-stage series adsorption and desorption rate of ammonia nitrogen by volume concentration of 18%of sulfuric acid is 99%above.After 10 cycles of adsorption and desorption,the adsorption performance of resin is stable.