摘要
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3 200,吹脱处理后氨氮浓度为1 999.56mg/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 twostage 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.
引文
[1]LI M T,WEI C,FAN G,et al.Acid leaching of black shale for the extraction of vanadium[J].International Journal of Mineral Processing,2010,95(1):62-67.
[2]LI W,ZHANG Y M,LIU T,et al.Comparison of ion exchange and solvent extraction in recovering vanadium from sulfuric acid leach solutions of stone coal[J].Hydrometallurgy,2013,131-132:1-7.
[3]谌纯,张一敏,黄晶,等.高浓度H2SO4体系中Cl-和SO2-4对N235萃取钒的影响[J].有色金属(冶炼部分),2017(2):36-39.
[4]罗大双,黄晶,张一敏,等.N235-煤油支撑液膜体系中钒萃取分离性能研究[J].有色金属(冶炼部分),2018(6):33-38.
[5]刘涛,张国斌,张一敏,等.石煤提钒沉钒母液的循环利用研究[J].稀有金属,2016,40(1):85-91.
[6]付朝阳,张一敏,刘涛,等.一步法石煤提钒反萃液酸性铵盐沉钒试验研究[J].稀有金属,2015,41(5):462-467.
[7]黄伟,张一敏,包申旭.减压膜蒸馏法处理石煤提钒高浓度氨氮废水实验研究[J].矿冶工程,2012,32(6):103-106.
[8]李望,张一敏,刘涛,等.磷酸铵镁沉淀法处理石煤提钒低浓度氨氮废水[J].工业水处理,2010,30(9):35-38.
[9]方立才.某含钒废渣生产五氧化二钒废水的处理研究[J].广州化工,2011,39(18):112-114.
[10]金雅雯,刘振鸿,薛罡,等.吹脱法预处理高氨氮染色废水的实验研究[J].环境科学与技术,2013,36(增刊1):147-149.
[11]赵燕,白雪.吹脱法处理高浓度氨氮废水试验研究[J].科技与创新,2016(1):78.
[12]黄鹏,林璠,刘爽,等.我国石煤提钒废水的处理现状与展望[J].化工环保,2016,36(1):22-25.
[13]LIN S H,WU C L.Ammonia removal from aqueous solution by ion exchange[J].Industrial&Engineering Chemistry Research,1996,35(2):553-558.
[14]GREENBERG A E,CLESCERI L S,EATON A D.Standard methods for the examination of water and wastewater[J].Am J Public Health Nations Health,1966,56(3):387-388.
[15]EMERSON K,RUSSO R C,LUND R E,et al.Aqueous ammonia equilibrium calculations effect of pH and temperature[J].1975,32(12):2379-2383.
[16]周伟博,伊学农,施柳,等.吹脱联合MAP法处理高氨氮废水的研究[J].中国给水排水,2014,30(21):110-113.
[18]MALKOC E,NUHOGLU Y.Fixed bed studies for the sorption of chromium(VI)onto tea factory waste[J].Chemical Engineering Science,2006,61(13):4363-4372.