Study on Cultivation and Morphology of Granular Sludge in Improved Methanogenic UASB

Abstract:

Based on the mesophilic two-phase anaerobic reactor for maize ethanol wastewater treatment, the start-up, cultivation and the morphology of mature granular sludge in improved methanogenic UASB were studied. The reactor was initiated at a low loading rate. By means of increasing volume loading rate gradually and regulating internal circulation, the improved methanogenic UASB was operated under an optimal condition. After more than two months of operation, the size for the 63% of total granular sludge was more than 1.3mm, the biogas production rate and COD removal rate achieved 539L/d and 90%, respectively. Start-up of improved methanogenic UASB was accomplished successfully. Improved UASB, served as methanogenic phase of two phase anaerobic process, can adjust pH value of influent automatically. The manual regulation of pH value during start-up could be stopped when the granular sludge in improved methanogenic UASB went into maturity stage. The microfloras of mature methanogenic granular sludge are mainly brevibacterium and filamentous bacteria. Methanothrix soehngenii is the dominant consortium after the long-term operation under low-strength.

• Periodical: Applied Mechanics and Materials (Volumes 209-211)
• Pages: 1152-1157
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.209-211.1152
• Online since: October 2012
• Authors: Jian Ping Huang, Li Li Liu, Yu Min Shao, Hong Jie Song, Lian Cheng Wu, Ling Xiao
• Keywords: Granular Sludge, Improved UASB, Maize Ethanol Wastewater, Methanogenic Phase, Two-Phase Anaerobic Treatment

References

[1] Hu Jicui: Wastewater anaerobic biological treatment theory and technology. (China architecture and building press, Beijing 2003). (in Chinese)

[2] Burak Demirel, Orhan Yenigun: J. Journal of chemical technology and biotechnology. Vol. 77 (2002), p.743

[3] Majumder P S, Gupta S K: J. Bioresource technology. Vol. 99 (2008), p.4169

[4] Subramanyam R, Mishra I M: J. Bioresource technology. Vol. 99 (2008), p.4147

[5] Zeng Guomin, Ma Yongwen: J. Chinese journal of environmental engineering. Vol. 4 (2010), p.67 (in Chinese)

[6] Seghezzo L, Zeeman G, B. van Lier J, Hamelers H. V. M. & Lettinga G: J. Bioresource Technology. Vol. 65 (1998), p.175

DOI: 10.1016/s0960-8524(98)00046-7

[7] Li Xiaojin, Yu Xuemin, Xu Ming, Yao Yeqing An Lichao: J. Technology of water treatment. Vol. 36 (2010), p.127 (in Chinese)

[8] Ghangrekar M.M, Asolekar S.R, Joshi S.G: J. Water research. Vol. 39 (2005), p.1123

[9] Yu Jiadong, Zhang Zhenjia, Wang Xinze: J. Industrial water & wastewater. Vol.35 (2004), p.57 (in Chinese)

[10] Standard Monitoring & Analytical Methods for the Examination of Water and Wastewater. 4th Edition. (China Environmental Science press, Beijing 2002). (in Chinese)