响应曲面法优化污泥基吸附剂处理含铅选矿废水的实验条件  

Experiment conditions optimization of lead-containing mineral processing wastewater treatment by sludge-based adsorbent through response surface methodology

作　　者：顾海奇 林伟雄 周佳丽 武纯 孙水裕[1,3] 杨帆 叶子玮 陈楠纬 任杰 GU Haiqi;LIN Weixiong;ZHOU Jiali;WU Chun;SUN Shuiyu;YANG Fan;YE Ziwei;CHEN Nanwei;REN Jie(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Environmental and Chemical Engineering,Zhaoqing University,Zhaoqing 526061,China;Guangdong Polytechnic of Environmental Protection Engineering,Foshan 528216,China;Guangdong Yuanquan Testing Technology Co.Ltd.,Foshan 528225,China)

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]肇庆学院环境与化学工程学院,肇庆526061 [3]广东环境保护工程职业学院,佛山528216 [4]广东源泉检测技术有限公司,佛山528225

出　　处：《环境工程学报》2020年第10期2751-2760,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2018YFD0800702);广东省高校青年创新项目(2017GkQNCX043);佛山市科技创新项目(2017AG100072);肇庆学院科研基金资助项目(2019012614,2018010172)。

摘　　要：针对碱性含铅选矿废水的处理问题,利用CaO-SA对广东省某含铅选矿废水进行了吸附研究。通过单因素实验,研究了吸附时间、pH、温度和吸附剂投加量等因素对吸附剂吸附Pb^2+的影响。利用Box-Behnken实验设计探究了吸附时间、pH、温度和投加量对Pb^2+的吸附影响并优化最优工艺参数,最后对CaO-SA吸附Pb^2+的机理进行探讨。单因素实验结果表明:吸附饱和时间为60 min;吸附剂最优投加量为5 g·L^-1;提高温度有利于吸附的进行;在碱性条件下,投加量为5 g·L^-1,适当增加温度有利于提高Pb^2+的去除率。通过Box-Behnken实验设计探究发现:各因素对吸附效果的影响顺序为温度>吸附时间>投加量>pH;在最佳条件(投加量为6 g·L^-1、温度40℃、pH=11、吸附时间为30 min)下,Pb^2+的去除率为99.63%;在较短吸附时间内,适当地增加投加量与提高温度有助于提高Pb^2+的去除率。对CaO-SA的SEM表征结果显示,该材料孔隙发达,提供吸附位点多。红外光谱与XRD的结果显示,CaO-SA对Pb^2+的吸附主要为吸附剂中羧酸盐与Pb^2+结合的化学吸附,其次是吸附剂中大量存在的硅酸盐与Pb^2+结合的物理吸附。以上研究结果可为CaO-SA工业化应用提供参考。In order to treat the alkaline lead-containing mineral processing wastewater,CaO-SA was used to treat a kind of wastewater in Guangdong.The effects of adsorption time,pH,temperature and dosage on Pb^2+adsorption by adsorbents were studied through the single factor experiment.Through Box-Behnken experimental design,the effects of adsorption time,pH,temperature and dosage on Pb^2+adsorption was investigated,and the process parameters were optimized.The Pb^2+adsorption mechanism by CaO-SA was also discussed.The single factor experiment results showed that the equilibrium times for Pb^2+adsorption was 60 min,the optimum dosage of CaO-SA was 5 g·L^-1,and the increase of temperature was beneficial to Pb^2+removal.The Box-Behnken experimental result showed that the influence order of various factors on the adsorption effect was temperature>adsorption time>addition amount>pH.Under the optimal adsorption conditions:the CaO-SA dosage of 6 g·L^-1,the temperature of 40°C,pH 11,and the adsorption time of 30 min,Pb^2+removal rate reached 99.63%.For the interaction of the factors,some increase of CaO-SA dosage and temperature conduced to the increase of Pb^2+removal during a short adsorption time.SEM images showed CaOSA had developed pores and provided lots of adsorption sites.FT-IR and XRD result indicated that that Pb^2+adsorption on the surface of CaO-SA was mainly through chemical adsorption with the combination of Pb^2+and carboxylate in CaO-SA,followed by physical adsorption with the combination of Pb^2+and a large amount of silicate in the adsorbent.This study can provide reference for the industrial application of CaO-SA.

关 键 词：污泥基吸附剂 碱性含铅选矿废水 吸附 曲面优化 

分 类 号：X703[环境科学与工程—环境工程]