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Solidification effect of river bottom sediments after flocculation via different composite flocculants

Environmental Science and Pollution Research volume 28, pages 12613–12627 (2021)Cite this article

Abstract

The main problem in the reduction of river bottom sediments is to solve the dewatering of the rive sediments. The reduction of river bottom sediments is usually dehydrated by natural air drying and requires more time and economic costs. Different proportions of composite flocculants and curing agents have been developed to the reduction of river bottom sediments according to the requirements of the project. Two or more flocculants were mixed with the rive sediments. Therefore, anionic polyacrylamide (PAM), polyaluminum chloride (PAC), polysilicate aluminum ferric (PSAF), and iron perchloride (IC) were selected for flocculation of river sediments. Through the sedimentation column test, the relationship between sedimentation amount and time was plotted, the turbidity value and pH value of the supernatant filtration supernatant were detected, and the flocculation effect of different flocculants was evaluated to obtain suitable groups of composite flocculants. The optimum ratio of two types of polyacrylamide with a molecular weight of 18 million and 23 million was 3:7. The turbidity of the supernatant of water could well be reduced by adding polysilicate aluminum ferric. Finally, the 6 groups of composite flocculants were determined according to the sedimentation and the turbidity value of the supernatant. The relative water content was maintained at about 60% before and after flocculation. At the same curing age, the compressive strength increased as the amount of curing agent increased after flocculation. At the same curing agent dosage, the overall solidification effect was reduced with increase of curing time after flocculation.

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Data availability

The datasets and materials used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work is supported by the National Nature Science Foundation of China (51702238), the China Postdoctoral Science Foundation (2019M650715), the Opening Funds of Jiangsu Key Laboratory of Construction Materials (CM2018-02), and the Plan Project of Science and Technology of Wenzhou (No. S20150010), and the financial support is gratefully acknowledged.

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Affiliations

  1. College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, 325035, China

    Linzhu Sun, Yunyun Zheng & Xiaoniu Yu

  2. School of Environment, Tsinghua University, Beijing, 100084, China

    Xiaoniu Yu

Authors
  1. Linzhu Sun
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  2. Yunyun Zheng
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  3. Xiaoniu Yu
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Contributions

Xiaoniu Yu conceived and wrote the paper; Xiaoniu Yu and Yunyun Zheng performed the calculations and experiments; Xiaoniu Yu, Linzhu Sun, and Yunyun Zheng contributed in the discussion to analyze the results.

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Correspondence to Xiaoniu Yu.

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Sun, L., Zheng, Y. & Yu, X. Solidification effect of river bottom sediments after flocculation via different composite flocculants. Environ Sci Pollut Res 28, 12613–12627 (2021). https://doi.org/10.1007/s11356-020-11242-9

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  • DOI: https://doi.org/10.1007/s11356-020-11242-9

Keywords

  • River bottom sediments
  • Flocculants
  • Turbidity value
  • Flocculation effect
  • Solidification effect