期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 207, 期 -, 页码 303-312出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.11.043
关键词
Biological sulfate conversion; Phase separation; Acidogenic/sulfidogenic reactor; Liquid phase recirculation; Sulfide removal
资金
- Sao Paulo Research Foundation (FAPESP) [2009/15984-0, 2015/06246-7]
- Coordination for the Improvement of Higher Education Personnel (CAPES) [1405116]
- National Council for Scientific and Technological Development (CNPq) [161940/2015-3]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [09/15984-0] Funding Source: FAPESP
The establishment of a sulfidogenic environment under thermophilic (55 degrees C) acidogenic conditions was assessed in an innovative structured-bed bioreactor to enhance sulfate removal and acetate production prior to methanogenesis. Diversified operating strategies, i.e., variations in the hydraulic retention time (HRT; 6-12 h), sulfate loading rate (SLR; 8-16 kg SO42- m(-3) day(-1)) and liquid phase recirculation ratio (0.0-57.0) were assessed to both enable the establishment of sulfate-reducing conditions and remove H2S from the liquid phase. Ethanol was used as the only carbon source. Applying a low HRT (6 h) as the initial operating strategy severely hindered the establishment of sulfate-reducing bacteria (SRB) populations within the system (sulfate removal < 27.5%). In turn, applying effluent recirculation had a positive impact on the system (sulfate removal similar to 60%) by providing an adequate buffer control along the entire height of the system, as well by displacing over 70% of the H2S to the gaseous phase. The maintenance of pH values above 6.1 proved to be adequate for the sulfidogenic activity, whereas enhanced acidic conditions (pH < 6.0) at the basal portion of the reactor comprised a determining factor to hinder sulfate reduction. SRB were able to handle H2S and acetate concentrations as high as 232 mg L-1 and 3111 mg L-1, respectively, after establishing an effective acidogenic/sulfidogenic environment, indicating that the proposed system has the potential to be used as the first stage in the anaerobic processing of sulfate-rich wastewater streams. (C) 2017 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据