T-42树脂对沉钒废水中氨氮的动态吸附及解吸研究
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摘要
为了了解T-42树脂吸附沉钒废水中氨氮的效果及其再生性能,研究了离子交换柱高径比、初始氨氮浓度和串联级数对吸附效果的影响,分析了等温吸附模型。此外,还研究了解吸过程中解吸剂的种类、流速、解吸剂溶液浓度对氨氮解吸效果的影响。结果表明:①当废水的流速为9 mL/min,柱高径比为21.0时,T-42树脂对氨氮的吸附效果较好,穿透点吸附量为21.91 mg/g,吸附终点吸附量为34.31 mg/g;随着初始氨氮浓度的升高,吸附量升高,处理废水量降低;氨氮浓度为1 999.56 mg/L的废水经2级串联吸附后达到一级标准(≤10 mg/L)。②T-42树脂吸附氨氮符合Langmuir等温吸附模型,吸附过程为单分子层化学吸附,在15、25、35℃下T-42树脂对氨氮的理论饱和吸附量分别为36.845 9、38.550 5、40.617 4 mg/g,温度升高有利于树脂的吸附。③在解吸剂硫酸溶液体积浓度为18%,流速为3 mL/min,解吸剂溶液用量为2.67个床层体积时,对吸附饱和的树脂上氨氮的解吸率大于99%。T-42树脂可以有效地去除废水中的氨氮,并且硫酸可以对吸附氨氮后的树脂进行解吸再生。
In order to understand the adsorption effect on ammonia nitrogen in vanadium precipitated wastewater and the recycle ability of T-42 resin,the influence of ratio of height to diameter of ion exchange column,original ammonia nitrogen concentration and series number on adsorption effect were studied,and the isothermal adsorption curve of T-42 resin was analyzed. In addition,the effect of the type,flow rate and concentration of desorbents on ammonia nitrogen desorption were also studied. The results showed that:①The adsorption effect of T-42 resin on ammonia nitrogen was better when the flow rate of wastewater was 9 mL/min and the ratio of height to diameter was 21.0. The adsorption capacity at the penetration point was21.91 mg/g,and the adsorption capacity at the end point was 34.31 mg/g. The adsorption capacity of resin on ammonia nitrogen increases with original ammonia nitrogen concentration increasing,but the wastewater treated decreases. Wastewater with concentration of ammonia nitrogen 1 999.56 mg/L meets the standard Class One(≤10 mg/L) by two-stage series adsorption. ②The adsorption of ammonia nitrogen by resin matches the Langmuir isothermal adsorption model and the adsorption process is single molecular layer chemical adsorption. The saturated adsorption capacity is 36.845 9 mg/g in 15 ℃,38.550 5 mg/g in 25 ℃,40.617 4 mg/g in 35 ℃. The increasing temperature is beneficial to the adsorption. ③In the case of volume concentration of sulfuric acid 18%,flow rate 3 mL/min and desorbent dosage 2.67 bed volumes,the ammonia nitrogen desorption rate of adsorption saturated resin was higher than 99%. T-42 resin can effectively remove ammonia nitrogen from wastewater,and sulfuric acid can desorb and regenerate the resin which adsorbs ammonia nitrogen.
In order to understand the adsorption effect on ammonia nitrogen in vanadium precipitated wastewater and the recycle ability of T-42 resin,the influence of ratio of height to diameter of ion exchange column,original ammonia nitrogen concentration and series number on adsorption effect were studied,and the isothermal adsorption curve of T-42 resin was analyzed. In addition,the effect of the type,flow rate and concentration of desorbents on ammonia nitrogen desorption were also studied. The results showed that:①The adsorption effect of T-42 resin on ammonia nitrogen was better when the flow rate of wastewater was 9 mL/min and the ratio of height to diameter was 21.0. The adsorption capacity at the penetration point was21.91 mg/g,and the adsorption capacity at the end point was 34.31 mg/g. The adsorption capacity of resin on ammonia nitrogen increases with original ammonia nitrogen concentration increasing,but the wastewater treated decreases. Wastewater with concentration of ammonia nitrogen 1 999.56 mg/L meets the standard Class One(≤10 mg/L) by two-stage series adsorption. ②The adsorption of ammonia nitrogen by resin matches the Langmuir isothermal adsorption model and the adsorption process is single molecular layer chemical adsorption. The saturated adsorption capacity is 36.845 9 mg/g in 15 ℃,38.550 5 mg/g in 25 ℃,40.617 4 mg/g in 35 ℃. The increasing temperature is beneficial to the adsorption. ③In the case of volume concentration of sulfuric acid 18%,flow rate 3 mL/min and desorbent dosage 2.67 bed volumes,the ammonia nitrogen desorption rate of adsorption saturated resin was higher than 99%. T-42 resin can effectively remove ammonia nitrogen from wastewater,and sulfuric acid can desorb and regenerate the resin which adsorbs ammonia nitrogen.
引文
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[16]周雅静,周扬,刘月英,等.D320树脂对Au(Ⅲ)的吸附性能研究[J].贵金属,2008(4):25-29.Zhou Yajing,Zhou Yang,Liu Yueying,et al.Study on adsorption performance of Au(Ⅲ)by D320 resin[J].Precious Metals,2008(4):25-29.
[2]Shi Qihua,Zhang Yimin,Liu Tao,et al.Recycling of ammonia wastewater during vanadium extraction from shale[J].JOM,2018,70:1-6.
[3]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(1):85-91.Liu Tao,Zhang Guobin,Zhang Yimin,et al.Recycle of vanadium precipitated liquor in extraction of vanadium from stone coal[J].Rare Metals,2016(1):85-91.
[4]Li Meng,Liu Biao,Zheng Shili,et al.A cleaner vanadium extraction method featuring non-salt roasting and ammonium bicarbonate leaching[J].Journal of Cleaner Production,2017,149:206-217.
[5]李瑞华,韦朝海,吴超飞,等.吹脱法预处理焦化废水中氨氮的条件试验与工程应用[J].环境工程,2007(3):38-40.Li Ruihua,Wei Chaohai,Wu Chaofei,et al.The Condition experiment and project application on pretreatment ammonia nitrogen in coking wastewater by stripping method.[J].Environmental Engineering,2007(3):38-40.
[6]Bazargan A,Shek T H,Hui C W,et al.Optimising batch adsorbers for the removal of zinc from effluents using a sodium diimidoacetate ion exchange resin[J].Adsorption-journal of the International Adsorption Society,2017(4):477-489.
[7]Wo?owicz A,Hubicki Z.Comparison of ion-exchange resins for efficient cobalt(II)removal from acidic streams[J].Chemical Engineering Communications,2018(9):1207-1225.
[8]Gupta M D,Loganathan P,Vigneswaran S.Adsorptive removal of nitrate and phosphate from water by a purolite ion exchange resin and hydrous ferric oxide columns in series[J].Separation Science&Technology,2012(12):1785-1792.
[9]Lin S H,Wu C L.Ammonia removal from aqueous solution by ion exchange[J].Industrial&Engineering Chemistry Research,1996(2):553-558.
[10]郑巧巧,张一敏,黄晶,等.T42树脂对沉钒废水中氨氮的吸附性能与机理研究[J].金属矿山,2018(12):179-183.Zheng Qiaoqiao,Zhang Yimin,Huang Jing,et al.Research on adsorption performance and mechanism of T42 resin on ammonia nitrogen in vanadium precipitated wastewater[J].Metal Mine,2018(12):179-183.
[11]Walter W G.APHA standard methods for the examination of water and wastewater[J].American Journal of Public Health&the Nations Health,2005(3):387.
[12]Attallah M F,Borai E H,Hilal M A,et al.Utilization of different crown ethers impregnated polymeric resin for treatment of low level liquid radioactive waste by column chromatography[J].Journal of Hazardous Materials,2011(1):73-81.
[13]金盾.关于钒工业水污染物排放标准的研究[D].沈阳:东北大学,2008.Jin Dun.Study on Discharge Standard of Vanadium Industrial Water Pollutants[D].Shenyang:Northeastern University,2008.
[14]Wong Chunwai,Barford J P,Chen Guohua,et al.Kinetics and equilibrium studies for the removal of cadmium ions by ion exchange resin[J].Journal of Environmental Chemical Engineering,2014(1):698-707.
[15]Rengaraj S,Seung-Hyeon M.Kinetics of adsorption of Co(II)removal from water and wastewater by ion exchange resins[J].Water Research,2002(7):1783-1793.
[16]周雅静,周扬,刘月英,等.D320树脂对Au(Ⅲ)的吸附性能研究[J].贵金属,2008(4):25-29.Zhou Yajing,Zhou Yang,Liu Yueying,et al.Study on adsorption performance of Au(Ⅲ)by D320 resin[J].Precious Metals,2008(4):25-29.
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