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Environ Sci Technol

Title:		Evaluating enhanced sulfate reduction and optimized volatile fatty acids (VFA) composition in anaerobic reactor by Fe (III) addition
Author(s):		Liu Y; Zhang Y; Ni BJ;
Address:		"Advanced Water Management Centre, The University of Queensland , St. Lucia, Queensland 4072, Australia"
Journal Title:		Environ Sci Technol
Year:		2015
Volume:		20150129
Issue:		4
Page Number:		2123 - 2131
DOI:		10.1021/es504200j
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Anaerobic reactors with ferric iron addition have been experimentally demonstrated to be able to simultaneously improve sulfate reduction and organic matter degradation during sulfate-containing wastewater treatment. In this work, a mathematical model is developed to evaluate the impact of ferric iron addition on sulfate reduction and organic carbon removal as well as the volatile fatty acids (VFA) composition in anaerobic reactor. The model is successfully calibrated and validated using independent long-term experimental data sets from the anaerobic reactor with Fe (III) addition under different operational conditions. The model satisfactorily describes the sulfate reduction, organic carbon removal and VFA production. Results show Fe (III) addition induces the microbial reduction of Fe (III) by iron reducing bacteria (IRB), which significantly enhances sulfate reduction by sulfate reducing bacteria (SRB) and subsequently changes the VFA composition to acetate-dominating effluent. Simultaneously, the produced Fe (II) from IRB can alleviate the inhibition of undissociated H2S on microorganisms through iron sulfide precipitation, resulting in further improvement of the performance. In addition, the enhancement on reactor performance by Fe (III) is found to be more significantly favored at relatively low organic carbon/SO4(2-) ratio (e.g., 1.0) than at high organic carbon/SO4(2-) ratio (e.g., 4.5). The Fe (III)-based process of this work can be easily integrated with a commonly used strategy for phosphorus recovery, with the produced sulfide being recovered and then deposited into conventional chemical phosphorus removal sludge (FePO4) to achieve FeS precipitation for phosphorus recovery while the required Fe (III) being acquired from the waste ferric sludge of drinking water treatment process, to enable maximum resource recovery/reuse while achieving high-rate sulfate removal"
Keywords:		"Anaerobiosis Bacteria, Anaerobic/growth & development *Bioreactors/microbiology Fatty Acids, Volatile/*analysis/chemistry Ferric Compounds/*chemistry Models, Theoretical Oxidation-Reduction Sewage/chemistry Sulfates/*analysis Sulfur-Reducing Bacteria/grow;"
Notes:		"MedlineLiu, Yiwen Zhang, Yaobin Ni, Bing-Jie eng Research Support, Non-U.S. Gov't 2015/01/22 Environ Sci Technol. 2015 Feb 17; 49(4):2123-31. doi: 10.1021/es504200j. Epub 2015 Jan 29"