Influence of Microwave and Ultrasound on Sludge Dewaterability

Abstract:

Sludge with large production is difficult to be dewatered without any pretreatment. Pretreatment with ultrasound and microwave can adjust the structure of sludge and change the water form, therefore increase the water content which could be dispelled easily. Dewaterability and morphological of sludge from sewage treatment plant including microwave and ultrasound were studied. Capillary Suction Time (CST), viscosity, Settle Volume (SV), water content, Chemical Oxygen Demand (COD), Zeta potential and morphological characteristics were tested. After microwave modification, the particle size of sludge ranged from 33.55μm to 28.98μm, and fractal dimension was about 2.8. Microscopic image analysis showed that the particle of sludge became coarse. After ultrasound modification, the particle size of sludge ranged from 33.55μm to 9.44μm, fractal dimension was about 2.9. Thus, the smaller particles were observed after ultrasound. The gray associate degree coefficient of viscosity and moisture content is the bigest. Through the analysis of dewatering characteristics of sludge and water content, a model which contributes to predict moisture content of sludge online was established.

• Periodical: Advanced Materials Research (Volumes 955-959)
• Pages: 2074-2079
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.955-959.2074
• Online since: June 2014
• Authors: Cui Hong Zhou*, Ying Ling, Meng Zeng, Xin Yue Li
• Keywords: Dewaterability Morphology, Microwave, Sludge, Ultrasound

References

[1] X. Yin, P.F. Han, X.P. Lu, and Y. Wang. A review on the dewaterability of bio-sludge and ultrasound pretreatment,. Ultrasonics Sonochemistry, vol. 11, pp.337-348, (2004).

DOI: 10.1016/j.ultsonch.2004.02.005

[2] K.A. Northcott, I. Snape, P. J. Scales, and G.W. Stevens. Dewatering behavior of water treatment sludges associated with contaminated site remediation in Antarctica,. Chemical Engineering Science, vol. 60, pp.6835-6843, (2005).

DOI: 10.1016/j.ces.2005.05.049

[3] X.Y. Li, S.F. Yang. Influence of loosely bound extracellular polymeric substances (EPS) on the flocculation, sedimentation and dewaterability of activated sludge,. Water Research, vol. 41, pp.1022-1030, (2007).

DOI: 10.1016/j.watres.2006.06.037

[4] C.H. Zhou, J.Q. Chen, H. Kong, and F.Y. Wang. Experiment of improved dehydration capability of municipal sludge,. Chinese Journal of Environmental Engineering, vol. 9, pp.2125-2128, (2011).

[5] M. Xie, Z. Shi, and S.Z. Li. Measuring Specific Resistance to Filtration(SRF) of Sludge,. Environmental Science & Technology, vol. 29, pp.15-16, 42, (2006).

[6] J. Vaxelaire, P. Cezac. Moisture distribution in activated sludges: a review,. Water Research, vol. 38, pp.2215-2230, (2004).

DOI: 10.1016/j.watres.2004.02.021

[7] D.J. Lee. CInterpretation of bound water data measured via dilatometric technique". Water Research, vol. 30, pp: 2230-2232, (1996).

DOI: 10.1016/0043-1354(96)00086-3

[8] B Jin, B.M. Wilén, P. Lant. Impacts of morphological, physical and chemical properties of sludge flocs on dewaterability of activated sludge,. Chemical Engineering Journal, vol, 98, 115-126, (2004).

DOI: 10.1016/j.cej.2003.05.002

[9] P.S. Yen, L.C. Chen, C.Y. Chien, R.M. Wu, and D.J. Lee. Network strength and dewaterability of flocculated activated,. Water Research, vol. 36, pp.539-550, (2002).

DOI: 10.1016/s0043-1354(01)00260-3

[10] K. Grijspeerdt, W. Verstraete. Image analysis to estimate the settleability and concentration of activated sludge,. Water Research, vol. 31, pp.1126-1134, (1997).

DOI: 10.1016/s0043-1354(96)00350-8

[11] C. Turchiuli, C. Fargues. Influence of structural properties of alum and ferric flocs on sludge dewaterability,. Chemical Engineering Journal, vol. 103, pp.123-131, (2004).

DOI: 10.1016/j.cej.2004.05.013

[12] L. Wolny, P. Wolski and I. Zawieja. Rheological parameters of dewatered sewage sludge after conditioning,. Desalination, vol. 222, pp.382-387, (2008).

DOI: 10.1016/j.desal.2007.01.175

[13] C.P. Chu, B. Chang, and G.S. Liao. Observations on change in ultrasonically treated waste activated sludge,. Water Research, vol. 35, pp.1038-1046, (2001).

DOI: 10.1016/s0043-1354(00)00338-9

[14] R. Dewila, J. Baeyensa, R. Goutvrind. The use of ultrasonics in the treatment of waste activated sludge,. Chinese J. Chem. Eng, vol. 14, pp.105-113, (2006).

DOI: 10.1016/s1004-9541(06)60045-1

[15] E. Liwarska-Bizukojc, M. Bizukojc. Digital image analysis to estimate the influence of sodium dodecylsulphate on activated sludge flocs., Process Biochemistry, vol. 40, pp.2067-2072, (2005).

DOI: 10.1016/j.procbio.2004.07.020

[16] Z.J. Wang, W. Wang. Thermal hydrolysis test of surplus sludge,. China Environmental Science, vol. 25, pp.56-60, (2005).

[17] S. Glendinning, J. Lamont-Black, C.J.F.P. Jones. Treatment of sewage sludge using electrokinetic geosynthetics,. Journal of Hazardous Materials vol. A139, pp.491-499, (2007).

DOI: 10.1016/j.jhazmat.2006.02.046