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- In relation to this article, we declare that there is no conflict of interest.
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Received August 25, 2022
Revised January 30, 2023
Accepted February 27, 2023
- Acknowledgements
- The authors thank the financial support from the National Natural Science Foundation of China (22278100); Training Plan for Young Innovative Talents of Ordinary Undergraduate Colleges and Universities in Heilongjiang Province (No. UNPYSCT-2015046).
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Sludge deep dewatering enhanced by zero-valent iron/peroxymonosulfate/ walnut shell powder
1School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China 2School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040 , Heilongjiang, China
zyphit@hebut.edu.cn
Korean Journal of Chemical Engineering, August 2023, 40(8), 1919-1927(9), 10.1007/s11814-023-1407-1
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Abstract
To enhance sludge dewatering performance, Zero-valent iron/peroxymonosulfate/walnut shell powder was
used to condition sludge at 55 o
C and pH=3 (ZVI/PMS/WSP-T/pH), and the dewatering mechanism was also analyzed. The results showed that the capillary suction time (CST) and water content of sludge cake (Wc) were reduced to
6.8 s and 62.1%, respectively, and net sludge yield (YN) increased to 58.74 kg/(m2
·h) after being treated by ZVI/PMS/
WSP-T/pH. The thermal and acid conditions could promote the corrosion of Fe2+ from ZVI and enhance PMS to produce more SO4
•
and ·OH. The radicals combined with acid and thermal hydrolysis could efficiently reduce extracellular polymeric substances (EPS), especially tightly bound EPS (TB-EPS), destroy sludge floc and release bound water.
The stripping off of EPS and neutralization of Fe3+, Fe2+ and H+
caused the zeta potential to increase to 0.91 mV. The
flocculation of cations and adsorption of WSP further increased the fractal dimension to 1.71. Moreover, the rigid and
porosity structure of WSP increased sludge incompressibility and formed channels for water. Under the combined oxidation, acid/thermal hydrolysis, re-aggregation and skeleton builder functions, the sludge dewatering performance was
greatly improved.
Keywords
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51. V. H. P. To, T. V. Nguyen, H. Bustamante and S. Vigneswaran, Sep.Purif. Technol., 239, 116557 (2020).
52. X. R. Liu, X. D. Huang, Y. X. Wu, Q. X. Xu, M. T. Du, D. B. Wang,Q. Yang, Y. W. Liu, B.-J. Ni, G. J. Yang, F. Yang and Q. L. Wang,Chem. Eng. J., 387, 124147 (2020).
53. S. Wang, X. X. Ma, Y. Y. Wang, G. C. Du, J.-H. Tay and J. Li, Bioresour. Technol., 273, 350 (2019).
54. H. T. Fan, X. H. Liu, H. Wang, Y. P. Han, L. Qi and H. C. Wang,Chemosphere, 169, 586 (2017).
55. N. Wang, W. J. Zhang, B. D. Cao, P. Yang, F. G. Cui and D. S. Wang,Chem. Eng. J., 350, 660 (2018).
56. J. S. Zhang, N. Li, X. H. Dai, W. Q. Tao, I. R. Jenkinson and Z. Li,Water Res., 131, 177 (2018).
57. Y. D. Zheng, M. Y. Xing, L. Z. Y. Cai, T. Xiao, Y. F. Lu and J. Z.Jiang, Sci. Total Environ., 581, 573 (2017).
58. B. R. Wu, H. Wang, X. H. Dai and X. L. Chai, Water Res., 202,117461 (2021)
