Study on the Membrane Fouling of the Process of Using Two Layer Flat-Sheet Membrane for Sludge Thickening and Water Reuse

Abstract:

In this paper, the critical flux was applied to represent the tendency of membrane fouling. The response surface model was used to study different factors, such as sludge concentration, space between membranes and aeration rate, affecting membrane fouling of the upper and lower layer membrane module. It was found that the model is fitting and significant, moreover, the sludge concentration, space between membranes and aeration rate has a significant impact on the upper and lower membrane fouling. Meanwhile, it was also observed that the critical flux of both upper and lower layer membrane module sharply decreased with the increase of sludge concentration. However, the different variation tendency of membrane fouling between upper and lower layer membrane module was detected due to the change of space between membranes and aeration rate, when it was under different sludge concentrations. Finally, optimum operating parameters under different sludge concentration simulated by response surface model were successfully applied to the process of using flat-sheet membrane for four-stage sludge thickening.

• Periodical: Applied Mechanics and Materials (Volume 768)
• Pages: 467-475
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.768.467
• Online since: June 2015
• Authors: Xue Feng Zhu*, Ming Yuan Zhou, Zhi Wei Wang, Wen Yi Yuan, Jie Guan
• Keywords: Critical Flux, Multi-Layer Membrane Modules, Response Surface Model, Sludge Thickening by Membrane

References

[1] X. H. Dai. Sludge disposal situation and thinking of domestic town. Water & Wastewater Engineering, 2012, (02): 1-5. (In Chinese).

[2] N. Duan, B. Dong, B. Wu, et al. High-solid anaerobic digestion of sewage sludge under mesophilic conditions: Feasibility study. Bioresource Technology. 2012, 104(0): 150-156.

DOI: 10.1016/j.biortech.2011.10.090

[3] X. F. Zhu. Treatment of waste activated sludge process engineering application and mechanism research by flat-membrane. Shanghai: Tongji University, 2012: 2-7. (In Chinese).

[4] X. H. Wang, Z. C. Wu, Hua J., et al. Optimization research of flat-sheet membrane for sludge thickening process operating conditions. Environmental Pollution & Control, 2008, 30 (6): 54-57. (In Chinese).

[5] X. H. Wang, Z. C. Wu, X. Z. Du, et al. The experimental research for the flat membrane enrichment sludge process, China Water & Wastewater, 2008, 24 (17): 49-52. (In Chinese).

[6] X. H. Wang, Z. C. Wu, Z. W. Wang, et al. Floc destruction and its impact on dewatering properties in the process of using flat-sheet membrane for simultaneous thickening and digestion of waste activated sludge. Bioresource Technology, 2009, 100(6): 1937-(1942).

DOI: 10.1016/j.biortech.2008.10.026

[7] Z. Wu, X. Zhu, Z. Wang. Temporal variations of membrane foulants in the process of using flat-sheet membrane for simultaneous thickening and digestion of waste activated sludge. Bioresource Technology, 2011, 102(13): 6863-6869.

DOI: 10.1016/j.biortech.2011.04.042

[8] X. H. Wang, Z. C. Wu, Z. W. Wang, et al. Membrane fouling mechanisms in the process of using flat-sheet membrane for simultaneous thickening and digestion of activated sludge. Separation and Purification Technology, 2008, 63(3): 676-683.

DOI: 10.1016/j.seppur.2008.07.013

[9] Z. C. Wu, X. H. Wang, Z. W. Wang, et al. Identification of sustainable flux in the process of using flat-sheet membrane for simultaneous thickening and digestion of waste activated sludge. Journal of Hazardous Materials, 2009, 162(2-3): 1397-1403.

DOI: 10.1016/j.jhazmat.2008.06.020

[10] Z. Wang, Z. Wu, X. Yin, et al. Membrane fouling in a submerged membrane bioreactor (MBR) under sub-critical flux operation: Membrane foulant and gel layer characterization. Journal of Membrane Science, 2008, 325(1): 238-244.

DOI: 10.1016/j.memsci.2008.07.035

[11] X. H. Wang. Mechanism and application research on flat-sheet membrane-sludge thickening and digestion process, Shanghai: Tongji University, 2009: 90.

[12] H. Yuan, N. Zhu, L. Song. Conditioning of sewage sludge with electrolysis: Effectiveness and optimizing study to improve dewaterability. Bioresource Technology, 2010, 101(12): 4285-4290.

DOI: 10.1016/j.biortech.2009.12.147

[13] N. Aghamohammadi, HbA. Aziz, MH. Isa, et al. Powdered activated carbon augmented activated sludge process for treatment of semi-aerobic landfill leachate using response surface methodology. Bioresource Technology, 2007, 98(18): 3570-3578.

DOI: 10.1016/j.biortech.2006.11.037

[14] Z. H. Yang, J. Huang, G. M. Zeng, et al. Optimization of flocculation conditions for kaolin suspension using the composite flocculant of MBFGA1 and PAC by response surface methodology. Bioresource Technology, 2009, 100(18): 4233-4239.

DOI: 10.1016/j.biortech.2008.12.033

[15] NEPA. Water and waste water detection analysis method (the third edition). Beijing: China Environmental Science Press, (1989).

[16] X. F. Zhu, M. Y. Zhou, Z. C. Wu, et al. Pilot study on sludge treatment of using flat-sheet membrane for four-stage sludge thickening and gray water recycle process. Chinese Journal of Environmental Engineering (In Chinese) (In press).