改性稻壳去除废水中砷(Ⅴ)的动态吸附试验
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摘要
针对目前铅锌选矿厂尾矿库废水总砷超标的问题,采用高锰酸钾改性稻壳对尾矿库含砷废水进行动态吸附实验研究,探讨了进水pH、进水流量、运行方式、高锰酸钾改性用量以及再生次数对吸附砷(Ⅴ)性能的影响,并用SEM、XPS、BET和Zeta电位等对改性稻壳进行表征分析。结果表明:高锰酸钾改性稻壳作吸附剂能有效去除尾矿库废水中的砷(Ⅴ),在达到吸附穿透点前,出水中的砷低于《铅、锌工业污染物排放标准》(GB 25466—2010)规定的总砷排放限值(0.3 mg/L),Thomas模型能很好地描述吸附过程。高锰酸钾改性稻壳再生后对砷仍能保持95%以上的吸附量,表明其具有良好的再生性能。
Aiming at the present problem of excess total arsenic in the tailings reservoir wastewater in lead-zinc ore dressing plants,potassium permanganate modified rice husks have been used in the experimental research on the dynamic adsorption of arsenic-containing tailings reservoir wastewater,and the influences of influent pH,influent flow,operation mode,dosage of potassium permanganate,and regeneration times on the adsorption capability for arsenic(Ⅴ) discussed,and characterized by means of SEM,XPS,BET and Zeta potential. The results show that the potassium permanganate modified rice husks as the adsorbent can effectively remove arsenic(Ⅴ) from tailings reservoir wastewater. Before reaching the adsorption penetrating point,the concentration of arsenic in the effluent is lower than the total arsenic discharge limit(0.3 mg/L) specified in the Emission Standard of Pollutants for Lead and Zinc Industrial(GB 25466—2010). The adsorption process is well described by Thomas model. The regenerated potassium permanganate modified rice husks still can retain more than 95% of arsenic adsorption capacity,indicating that they have good regeneration capability.
Aiming at the present problem of excess total arsenic in the tailings reservoir wastewater in lead-zinc ore dressing plants,potassium permanganate modified rice husks have been used in the experimental research on the dynamic adsorption of arsenic-containing tailings reservoir wastewater,and the influences of influent pH,influent flow,operation mode,dosage of potassium permanganate,and regeneration times on the adsorption capability for arsenic(Ⅴ) discussed,and characterized by means of SEM,XPS,BET and Zeta potential. The results show that the potassium permanganate modified rice husks as the adsorbent can effectively remove arsenic(Ⅴ) from tailings reservoir wastewater. Before reaching the adsorption penetrating point,the concentration of arsenic in the effluent is lower than the total arsenic discharge limit(0.3 mg/L) specified in the Emission Standard of Pollutants for Lead and Zinc Industrial(GB 25466—2010). The adsorption process is well described by Thomas model. The regenerated potassium permanganate modified rice husks still can retain more than 95% of arsenic adsorption capacity,indicating that they have good regeneration capability.
引文
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[2]邓再芳.膨化稻壳基重金属吸附新材料动力学及机理研究[D].绵阳:西南科技大学,2011.
[3]梁昊,罗朝晖,赵海燕,等.7种改性水稻秸秆对溶液中Cd的吸附[J].中国环境科学,2018,38(2):596-607.
[4]Kenari S L D,Barbeau B.Size and Zeta potential of oxidized iron and manganese in water treatment:influence of pH,ionic strength,and hardness[J].Journal of Environmental Engineering,2016,142(5):1-8.
[5]Lee C K,Low K S,Liew S C,et al.Removal of arsenic(Ⅴ)from aqueous solution by quaternized rice husk[J].Environmental Technology Letters,1999,20(9):971-978.
[6]陈维芳,程明涛,张道方.CTAC改性活性炭去除水中砷(Ⅴ)的柱实验吸附和再生研究[J].环境科学学报,2012,32(1):150-156.
[7]黄流雅,胡娟,张巍,等.颗粒活性炭吸附去除水中三氯乙烯的研究[J].环境污染与防治,2009,31(9):34-39.
[8]雷娟.高锰酸钾改性对花生壳吸附Cd2+和Pb2+的特性和机理的影响[D].广州:华南理工大学,2014.
[9]佟强.不同铁基材料的制备及对砷(Ⅲ)的吸附研究[D].沈阳:辽宁大学,2017.
[10]刘兴旺,陈建宏,胡晞.改性铁矾土对废水中砷的吸附效能研究[J].工业水处理,2016,36(10):44-47.
[11]肖静,田凯勋,高怡.载铁活性炭吸附剂的制备及除砷(Ⅲ)性能研究[J].工业水处理,2012,32(11):28-32.