Experiment conditions optimization of lead-containing mineral processing wastewater treatment by sludge-based adsorbent through response surface methodology
GU Haiqi1,, LIN Weixiong2, ZHOU Jiali1, WU Chun4, SUN Shuiyu1,3,,, YANG Fan3, YE Ziwei3, CHEN Nanwei3, REN Jie3 1.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China 2.School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China 3.Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China 4.Guangdong Yuanquan Testing Technology Co. Ltd., Foshan 528225, China
Abstract: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 Pb2+ 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 Pb2+ adsorption was investigated, and the process parameters were optimized. The Pb2+ adsorption mechanism by CaO-SA was also discussed. The single factor experiment results showed that the equilibrium times for Pb2+ adsorption was 60 min, the optimum dosage of CaO-SA was 5 g·L?1, and the increase of temperature was beneficial to Pb2+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, Pb2+ removal rate reached 99.63%. For the interaction of the factors, some increase of CaO-SA dosage and temperature conduced to the increase of Pb2+ removal during a short adsorption time. SEM images showed CaO-SA had developed pores and provided lots of adsorption sites. FT-IR and XRD result indicated that that Pb2+ adsorption on the surface of CaO-SA was mainly through chemical adsorption with the combination of Pb2+ and carboxylate in CaO-SA, followed by physical adsorption with the combination of Pb2+ and a large amount of silicate in the adsorbent. This study can provide reference for the industrial application of CaO-SA. Key words:sludge-based adsorbent/ alkaline lead-containing mineral processing wastewater/ adsorption/ response surface methodology optimization.
图1投加量对CaO-SA 去除Pb2+的影响 Figure1.Effect of dosage on Pb2+ removal by CaO-SA
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Experiment conditions optimization of lead-containing mineral processing wastewater treatment by sludge-based adsorbent through response surface methodology
1.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China 2.School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China 3.Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China 4.Guangdong Yuanquan Testing Technology Co. Ltd., Foshan 528225, China Received Date: 2019-10-22 Accepted Date: 2020-01-10 Available Online: 2020-10-14 Keywords:sludge-based adsorbent/ alkaline lead-containing mineral processing wastewater/ adsorption/ response surface methodology optimization Abstract: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 Pb2+ 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 Pb2+ adsorption was investigated, and the process parameters were optimized. The Pb2+ adsorption mechanism by CaO-SA was also discussed. The single factor experiment results showed that the equilibrium times for Pb2+ adsorption was 60 min, the optimum dosage of CaO-SA was 5 g·L?1, and the increase of temperature was beneficial to Pb2+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, Pb2+ removal rate reached 99.63%. For the interaction of the factors, some increase of CaO-SA dosage and temperature conduced to the increase of Pb2+ removal during a short adsorption time. SEM images showed CaO-SA had developed pores and provided lots of adsorption sites. FT-IR and XRD result indicated that that Pb2+ adsorption on the surface of CaO-SA was mainly through chemical adsorption with the combination of Pb2+ and carboxylate in CaO-SA, followed by physical adsorption with the combination of Pb2+ and a large amount of silicate in the adsorbent. This study can provide reference for the industrial application of CaO-SA.