Enhancement of anaerobic digestion of oily sludge by alkali pretreatment coupled with zero-valent iron

被引：0
|
作者：
Wang T. [1 ]
Zhao Z. [1 ]
Zhang Y. [1 ]
机构：
[1] School of Environmental Science and Technology, Dalian University of Technology, Dalian
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 01期
关键词：
Alkali pretreatment; Anaerobic digestion; Oily sludge; Zero-valent iron;
D O I：
10.16085/j.issn.1000-6613.2020-0434
中图分类号：
学科分类号：
摘要：
Oily sludge usually contains more bio-degradable organic compounds, and the sludge has a large viscosity and a high degree of emulsification, which leads to its low anaerobic digestion potential. Slow sludge cell wall breaking is a rate-limiting step for anaerobic digestion of sludge. In this study, by performing alkaline pretreatment of oily sludge, the wall of sludge cells was broken, and a large amount of dissolved organic matter was detected, which further accelerated the hydrolysis of sludge to dissolved small molecule organic matter and improved the efficiency of anaerobic digestion. On the other hand, in order to solve the problem of excessive organic acids (such as propionic acid) accumulating by pretreatment and destroying the pH balance in the anaerobic system, this study reduced the partial pressure of hydrogen in the anaerobic system by adding zero-valent iron, thereby promoting the conversion of small molecules such as propionic acid to acetic acid promotes methanogenesis and ultimately maintains the pH balance in the anaerobic system. The results of the study showed that the output of methane from oily sludge after alkaline pretreatment increased by 91.7%, while the sludge reduction rate increased by 8 percentage points. Alkaline pretreatment coupled with zero-valent iron powder increased methane production by 105.4% and sludge reduction rate by 13 percentage points. The pH conditions of alkali pretreatment were further optimized. The results showed that the optimal pH for alkali treatment was obtained at 9. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：534 / 541
页数：7
相关论文
共 20 条
  • [1] SILVA L J D, ALVES F C, FRANCA DE, A review of the technological solutions for the treatment of oily sludges from petroleum refineries, Waste Management & Research the Journal of the International Solid Wastes & Public Cleansing Association Iswa, 30, 10, pp. 1016-1030, (2012)
  • [2] WANG Limin, The energy market adjusts flexibly to respond to changes in the world-"BP Statistical Review of World Energy June 2013" released, International Petroleum Economics, 7, pp. 74-80, (2013)
  • [3] ZHAO M, WANG X Y, LIU D, Et al., Insight into essential channel effect of pore structures and hydrogen bonds on the solvent extraction of oily sludge, Journal of Hazardous Materials, 389, (2020)
  • [4] TAHHAN R A, AMMARI T G, GOUSSOUS S J, Et al., Enhancing the biodegradation of total petroleum hydrocarbons in oily sludge by a modified bioaugmentation strategy, International Biodeterioration & Biodegradation, 65, 1, pp. 130-134, (2011)
  • [5] BHATTACHARYYA J K, SHEKDAR A V., Treatment and disposal of refinery sludges: Indian scenario, Waste Manag. Res, 21, 3, pp. 249-261, (2003)
  • [6] LIU Huajie, YANG Dianhai, XUE Yonggang, Et al., Anaerobic digestion test of sludge from oily wastewater treatment plant, Chemical Industry and Engineering Progress, 32, 10, pp. 2501-2506, (2013)
  • [7] YUAN H, CHEN Y, ZHANG H, Et al., Improved bioproduction of short-chain fatty acids (SCFAs) from excess sludge under alkaline conditions, Environmental Science & Technology, 40, 6, pp. 2025-2029, (2006)
  • [8] RAY B T, RAJAN J G L V., Low-level alkaline solubilization for enhanced anaerobic digestion, Research Journal of the Water Pollution Control Federation, 62, 1, pp. 81-87, (1990)
  • [9] OH B T, JUST C L, ALVAREZ P J., Hexahydro-1, 3, 5-trinitro-1, 3, 5-triazine mineralization by zerovalent iron and mixed anaerobic cultures, Environmental Science and Technology, 35, 21, pp. 4341-4346, (2001)
  • [10] CHU L, YAN S, XING X H, Et al., Progress and perspectives of sludge ozonation as a powerful pretreatment method for minimization of excess sludge production, Water Research, 43, 7, pp. 1811-1822, (2009)
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