生态与农村环境学报 ›› 2017, Vol. 33 ›› Issue (8): 730-736.doi: 10.11934/j.issn.1673-4831.2017.08.008

• 污染控制与修复 • 上一篇    下一篇

壳聚糖活性污泥复合吸附剂处理铅、镉废水研究

赵佐平1,2, 段敏1,2, 刘智峰1,2, 汤波1,2, 同延安3   

  1. 1. 陕西理工大学化学与环境科学学院, 陕西 汉中 723001;
    2. 陕南秦巴山区生物资源综合开发协同创新中心, 陕西 汉中 723001;
    3. 西北农林科技大学资源环境学院, 陕西 杨凌 712100
  • 收稿日期:2016-08-19 出版日期:2017-08-25 发布日期:2017-09-25
  • 通讯作者: 同延安,E-mail:tongyanan@nwsuaf.edu.cn E-mail:tongyanan@nwsuaf.edu.cn
  • 作者简介:赵佐平(1982-),男,陕西旬阳人,博士,主要从事环境监测等方面的研究。E-mail:zhaozuoping@126.com
  • 基金资助:

    国家公益性行业科研专项(201203045);陕西省2011协同创新中心项目〔QBXT-Z(P)-15-5〕;2016年国家级大学生创新创业训练计划(201610720009)

Research on Adsorption Performance of Chitosan-Activated Sludge Composite Adsorbent to Cadmium and Lead in Wastewater

ZHAO Zuo-ping1,2, DUAN Min1,2, LIU Zhi-feng1,2, TANG Bo1,2, TONG Yan-an3   

  1. 1. College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China;
    2. Qinba Mountains Bio-Resource Collaborative Innovation Center of Southern Shaanxi Province, Hanzhong 723001, China;
    3. College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
  • Received:2016-08-19 Online:2017-08-25 Published:2017-09-25

摘要:

研究了壳聚糖活性污泥复合吸附剂(SCTS)对废水中Pb2+和Cd2+的吸附性能,通过单因素试验分析了温度、SCTS投加量、pH值、搅拌转速和重金属离子浓度对SCTS吸附性能的影响,正交试验确定了影响因素的主次顺序及最优组合水平。结果表明:影响SCTS吸附废水中Pb2+的因素从大到小依次为pH值、SCTS投加量、Pb2+初始浓度和搅拌转速,吸附Pb2+的最优组合为pH值=2、SCTS投加量为10 g·L-1ρ(Pb2+)初始值为50 mg·L-1、搅拌转速130 r·min-1,Pb2+去除率达95.76%。影响SCTS吸附废水中Cd2+的因素作用力大小依次为pH值、Cd2+初始浓度、转速和SCTS投加量,吸附Cd2+的最优组合为pH值2、SCTS投加量2.5 g·L-1ρ(Cd2+)初始值60 mg·L-1、转速130 r·min-1,此时Cd2+的去除率为96.08%。

关键词: 壳聚糖, 复合吸附剂, 镉, 铅, 废水, 吸附

Abstract:

The adsorption performance of the chitosan-activated sludge composite adsorbent on cadmium and lead in wastewater was examined, and the influencing factors, such as temperature, SCTS addition, pH, rotate speed and the concentration of heavy metals were investigated in a single factor experiment, thus the order of influencing factors and the optimal combination were determined in an orthogonal experiment. The results show that the factors affecting the adsorption of lead followed the order of pH > SCTS addition > initial concentration of Pb2+ > rotate speed. The optimal adsorption of Pb2+could be reached with the pH of 2, SCTS addition of 10 g·L-1, Pb2+ initial concentration of 50 mg·L-1, and rotate speed of 130 r·min-1, and the removal rate of Pb2+ reached 95.76%. The factors influencing the adsorption of cadmium followed the order of pH > initial concentration of Cd2+ > rotate speed > SCTS addition. The optimal adsorption of Cd2+ could be reached with the pH of 2, SCTS addition of 2.5 g·L-1, Cd2+ initial concentration of 60 mg·L-1, and rotate speed of 130 r·min-1, and the removal rate of Cd2+ reached 96.08%. The composite adsorbent explores a new way for reutilization of sludge and provides a new method for wastewater treatment.

Key words: chitosan, composite adsorbent, cadmium, lead, wastewater, adsorption

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