Treating urban dredged silt with ethanol improves settling and solidification properties

Zhao-Hui Chai; Guo-Lu Yang; Meng Chen

Korean Journal of Chemical Engineering, Vol.30, No.1, 105-110, January, 2013

DOI10.1007/s11814-012-0089-x Export Citation

Treating urban dredged silt with ethanol improves settling and solidification properties

Zhao-Hui Chai, Guo-Lu Yang^†, and Meng Chen

Sewage Sludge and Silt Research Centre, State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China

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The organic matter content in urban dredged silt is high for the indraft of municipal sewage, and it seriously influences the utilization of urban dredged silt. It is necessary to find a method to solve this problem. This paper presents a method of treating the silt with ethanol (STE), considering that ethanol is a good organic solvent which can dissolve many kinds of organic matter, and optimizes the treatment conditions through Box-Benhnken design (BBD) experiment with organic matter removal efficiency as the response. The ideal conditions were as follows: action time, 47 min; ethanol concentration, 41%; ratio of ethanol to silt, 54 : 1 ml/g with organic matter removal efficiency of 51.12%. Then, settling and solidification properties of raw silt and STE were explored through laboratory experiments. The results show treating urban dredged silt improved the settling and solidification properties of silt.

Keywords:Urban Dredged Silt;Organic Matter;Ethanol;Settling;Solidification

[References]

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[1] Zhao XQ, Yang LY, Yu ZY, Fan QH, Zhan Z, Xiao YG, Yin DQ, Qin BQ, J. Lake. Sci., 19, 698 (2007)

[2] Keppler F, Eiden R, Niedan V, Pracht J, Scholer F, Nature., 403, 298 (2000)

[3] Tsuchida T, Porbaha A, Yamane N, J. Mater. Civ. Eng., 13, 152 (2001)

[4] Yozzoa DJ, Wilberb P, Willc R, J. Environ. Manage., 73, 39 (2004)

[5] Browers HJH, Augustijn DCM, Krikke B, Honders A, J. Hazard. Mater., 145(1-2), 8 (2007)

[6] Li DJ, Oceanol. Limnol. Sin., 31, 295 (2000)

[7] Eisma D, J. Sea. Res., 28, 193 (1991)

[8] Chen CY, Zhang PY, Zeng GM, Deng JH, Zhou Y, Lu HF, Chem. Eng. J., 158(3), 616 (2010)

[9] Zhu W, Zeng KL, Zhang CL, Rock and Soil Mechanics., 29, 34 (2008)

[10] Parkkinen E, Proceedings of the 14th International Conference on Soil Mechanics and Foundation Engineering, Hamburg, Germany,, 1701 (1997)

[11] Fan ZP, Zhu W, Zhang CL, Rock and Soil Mechanics., 26, 1328 (2005)

[12] Agostini F, Skoczylas F, Lafhaj Z, Cem. Concr. Compos., 29, 270 (2007)

[13] Lafhaj Z, Samara M, Agostini F, Boucard L, Skoczylas F, Depelsenaire G, Cons. Build. Mater., 22, 755 (2008)

[14] Jiang HF, Qian JQ, Journal of the Chinese Cereals and Oils Association., 22, 115 (2007)

[15] Ayfer D, Turgay E, Turk. J. Bool., 27, 157 (2003)

[16] Chatterjee A, Lal R, Wielopolski L, Martin MZ, Ebinger MH, Crit. Rev. Plant Sci., 164, 28 (2009)

[17] Ding Z, Zhang L, Fang Y, Xu L, Zhang K, Shi GY, Korean J. Chem. Eng., 26(3), 719 (2009)

[18] Kargupta K, Datta S, Sanyal SK, Biochem. Eng. J., 1, 31 (1998)

[19] Lee JW, Yoo YJ, Korean J. Chem. Eng., 11(2), 119 (1994)

[20] Lee WG, Lee JS, Park BG, Kim MS, Park SC, Chang HN, Korean J. Chem. Eng., 13(5), 453 (1996)

[21] Hunter KA, Liss PS, Limnol. Oceanger., 27, 322 (1982)

[22] Hunter KA, Limnol. Oceanger., 25, 807 (1980)

[23] Zeng KL, Influence Mechanism of Humic Acid to Solidification Effect of Dredged Silt. Nan Jing: Hohai University (2006)

[24] Rosen MJ, Surfactants and Interfacial Phenomena, New York, Academic Press (1978)