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T42树脂对沉钒废水中氨氮的吸附性能与机理研究 被引量:5

Research on Adsorption Performance and Mechanism of T42 Resin on Ammonia Nitrogen in Vanadium Precipitated Wastewater
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摘要 在铵盐沉钒过程中会产生大量的氨氮废水,不经处理直接排放会造成严重的环境污染。分别以T42、D001、001*8、D113为吸附剂,考察其对吹脱后铵盐沉钒废水中氨氮的吸附去除性能。结果表明,T42树脂对氨氮的去除效果最好。以T42树脂为吸附剂去除氨氮,在pH=8、温度为25℃、吸附平衡时间为9 min时,去除效果最佳。T42吸附剂吸附去除氨氮反应过程的焓变为3.38 kJ/mol、熵变为18.90 J/(mol·K),不同温度下吉布斯自由能均为负数,说明T42树脂吸附氨氮为自发进行的吸热反应,升高温度有利于吸附的进行;拟二级动力学模型可以较好地解释吸附过程,吸附过程以化学吸附为主。在沉钒废水流速为9 mL/min,柱高为14 cm,pH=8,沉钒废水体积为321 mL时,经过3级串联处理后,出水氨氮浓度为1.13 mg/L,达到《钒工业污染物排放标准》,T42树脂可有效去除沉钒废水中的残余氨氮。 A large amount of ammonia nitrogen wastewater is produced in the process of vanadium precipitation by ammonium salts and will cause serious environment pollution if discharged directly without treatment. Therefore,four kinds of T42,D001,001*8 and D113 resins were selected,and their adsorption performance on ammonia nitrogen in vanadium precipitation wastewater were studied. Results show that,T42 resin has the best effect on ammonia nitrogen removal. The optimum parameter for ammonia nitrogen removal by T42 resin: pH is 8,and temperature is 25 ℃ and equilibrium time is 9 min.Enthalpy change is 3.38 kJ/mol,entropy change is 18.90 J/(mol·K) and Gibbs free energy is negative at different temperatures,this indicate that the reaction of T42 resin adsorbed ammonia nitrogen is spontaneous and endothermic process. Pseudosecond order kinetic models are used to describe adsorption process of ammonia nitrogen,and the adsorption process is mainly chemical adsorption. The satisfactory removal of ammonia nitrogen were obtained under the condition of flow rate of 9 min,resin bed height of 14 cm,p H=8 and treated volume of 321 mL after three-stage series treatment,the concentration of ammonia nitrogen was 1.13 mg/L meeting Discharge standard of pollutants for Vanadium Industry. Thus T42 resin can effectively remove the residual ammonia nitrogen in the vanadium precipitated wastewater.
作者 郑巧巧 张一敏 黄晶 包申旭 Zheng Qiaoqiao;Zhang Yimin;Huang Jing;Bao Shenxu(School of Resource and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan 430070,China;State Key Laboratory of Environmental Protection for Minera.l Metallurgical Resources Utilization and Pollution Control,Wuhan 430081,China;Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources ,Wuhan 430081,China)
出处 《金属矿山》 CAS 北大核心 2018年第12期179-183,共5页 Metal Mine
基金 国家自然科学基金项目(编号:51774215) 湖北省自然科学基金杰出青年项目(编号:2018CFA068)
关键词 沉钒废水 离子交换 吸附 氨氮 Vanadium precipitated wastewater Resin absorption Ammonia nitrogen
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