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Application of FeCl3 to Adjust Urban Sewage-Dewatered Sludge (UDSS) Containing Cationic Polyacrylamide (CPAM) for Further Dewatering

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Abstract

The urban sewage-dewatered sludge (UDSS) containing cationic polyacrylamide is difficult to dewater. FeCl3 was used as conditioner to adjust the UDSS. To investigate the effect and principle, the physicochemical properties of UDSS were evaluated in terms of dewatering equipment, micro electrophoresis, Malvern laser particle size analyzer, nuclear magnetic resonance analyzer, and scanning electron microscopy. Results showed that the network structure of UDSS produced by CPAM still had high negative charge, which locked much water in the flocs and resulted in the poor dewaterability of UDSS. When Fe3+ was added into the UDSS, the inner structure of sludge was destroyed by the charge neutralism and releasing more water. At the same time, because the function of precipitate produced by the hydrolytic action, the inner structure of the sludge was solidified; therefore, the compressibility of UDSS decreased. Finally, the dewaterability of UDSS was improved and the moisture content of filter cakes can be decreased to 55%.

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Abbreviations

CPAM:

cationic polyacrylamide

CST:

capillary suction time

EPS:

extracellular polymeric substances

LB-EPS:

loosely bound EPS

MC:

moisture contents

PAM:

Polyacrylamide

PN:

Protein

PS:

Polysaccharides

SRF:

specific resistance of sludge

SEM:

scanning electron microscopy

TB-EPS:

tightly bound EPS

USS:

urban sewage sludge

UDSS:

urban sewage-dewatered sludge

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Acknowledgements

This research was supported by grants from Tai Shan Scholar Foundation (No.ts201511003), the National High Technology Research and Development Program (863 Program) of China (Grant No.412 2012AA063501).

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China

    Jingzhen Zhang, Chao Xia, Qinyan Yue, Baoyu Gao, Kunlun Yang, Suqing Wu & Yujiao Kan

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  1. Jingzhen Zhang
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  2. Chao Xia
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  3. Qinyan Yue
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  4. Baoyu Gao
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  5. Kunlun Yang
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  6. Suqing Wu
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  7. Yujiao Kan
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Corresponding authors

Correspondence to Qinyan Yue or Baoyu Gao.

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Zhang Jingzhen and Xia Chao are co-first authors.

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Zhang, J., Xia, C., Yue, Q. et al. Application of FeCl3 to Adjust Urban Sewage-Dewatered Sludge (UDSS) Containing Cationic Polyacrylamide (CPAM) for Further Dewatering. Water Air Soil Pollut 228, 196 (2017). https://doi.org/10.1007/s11270-017-3377-6

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  • DOI: https://doi.org/10.1007/s11270-017-3377-6

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