生态与农村环境学报 ›› 2019, Vol. 35 ›› Issue (3): 368-376.doi: 10.19741/j.issn.1673-4831.2018.0617

• 污染控制与修复 • 上一篇    下一篇

污染底泥制备陶粒及除磷潜力研究

杨欣妍, 魏儒平, 杨柳燕   

  1. 污染控制与资源化研究国家重点实验室/南京大学环境学院, 江苏 南京 210023
  • 收稿日期:2018-10-06 出版日期:2019-03-25 发布日期:2019-04-25
  • 通讯作者: 杨柳燕 E-mail:yangly@nju.edu.cn
  • 作者简介:杨欣妍(1993-),女,江苏南京人,硕士生,主要研究方向为环境科学。E-mail:xyyang_nju@hotmail.com
  • 基金资助:

    国家水体污染控制与治理科技重大专项(2017ZX07204)

Research on Preparing Ceramsite From Polluted River Sediment and the Potential of the Ceramsite on Phosphorus Removal

YANG Xin-yan, WEI Ru-ping, YANG Liu-yan   

  1. State Key Laboratory of Pollution Control and Resource Reuse/School of the Environment, Nanjing University, Nanjing 210023, China
  • Received:2018-10-06 Online:2019-03-25 Published:2019-04-25

摘要:

底泥疏浚能够有效解决河道水体黑臭问题并提高水质,但后期底泥处置成为难题。为了合理处置污染河道疏浚过程中产生的底泥,采用高温烧结法制备底泥陶粒,并回用于河道水体治理。采用响应面优化方法得到底泥陶粒制备最优条件:烧结时间为14 min,烧结温度为1 025℃,Al2O3添加量w为8.10%。底泥陶粒吸附磷的试验结果表明,底泥陶粒吸附磷的热力学过程符合单层吸附的Langmuir模型,拟合计算得到底泥陶粒对磷最大吸附量为9.40 mg·g-1,底泥陶粒的磷吸附动力学过程符合伪一级动力学模型。结合化学成分、扫描电镜、能谱及红外光谱分析,底泥陶粒主要通过吸附作用去除水体中磷。与其他吸附剂相比,底泥陶粒具有吸附性能好和价格低廉的优点,在河道水体治理中使用底泥陶粒可以解决疏浚底泥的处置问题,实现底泥资源化利用。

关键词: 重污染底泥, 陶粒, 资源化, 响应面分析, 除磷

Abstract:

Dredging can effectively solve the problem of black and offensive odor in river and improve water quality, but the disposal of sediment produced in dredging has become difficult in the later stage. In order to better dispose the river sediment, sediment ceramsite was prepared by thermal treatment and reused for river regulation. Based on single factor experiment, the optimum preparation conditions of sediment ceramsite were obtained by response surface methodology, with sintering time as 14 min, sintering temperature as 1 025℃, and the addition amount of w(Al2O3) as 8.10%. As suggested by experimental results, the phosphorus adsorption process on sediment ceramsite was better accorded with Langmuir isotherm by single layer adsorption, and the maximum phosphorus sorption capacity was 9.40 mg·g-1 by model calculation. Pseudo-first order kinetic model accurately fitted the adsorption data. Combined with XRD, SEM-EDS and FTIR analysis, phosphorus was mainly removed by sediment ceramsite adsorption. Compared with other adsorbents, sediment ceramsite has the advantages of better adsorption performance and lower cost. The application of sediment ceramsite in river water treatment can not only solve the problem of dredged sediment disposal, but also effectively reduce phosphorus released from river sediment and realize sediment utilization.

Key words: polluted sediment, ceramsite, reclamation, response surface methodology, phosphorus removal

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