Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (3): 368-376.doi: 10.19741/j.issn.1673-4831.2018.0617

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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


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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