Microbial sufate/sulfide removal cells: electricity performance and mechanism
Date Issued
2013
Date
2013
Author(s)
Weng, Ling-Shiang
Abstract
Sulfur-containing wastewater has received many attentions due to the corrosive, toxic and stinking properties of sulfide. This work startup microbial sulfate/sulfide removal cells (MSRC) using sulfate reducing bacteria consortia. Mechanism of electricity production is also been studied by means of changing recipe of media or electrochemical analysis methods, including linear sweep voltammetry(LSV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).
The result showed that most of the bacteria in MSRC can’t directly use solid anode as electron acceptor. They need to utilize sulfate/sulfide as a single direction electron mediator. Firstly, the sulfate-reducing bacteria (SRB) used lactate as electron donor and reduced the sulfate to sulfide, which was then oxidized to deposited elementary sulfur (S0) by neighboring sulfide oxide bacteria (SOB) and delivered the electron to the electrode. With this process, both sulfate and sulfide can be converted to S0 via SRB and SOB with a maximum 77.9 % conversion rate with stable 300 mV voltage outputs based on 1000 ohm external resistance in 3 days tests.
The deposited S0 can be potentially recycled as a resource, which lead the MSRC to be a more cost-effective technology to treat sulfate/sulfide laden wastewater with electricity production simultaneously. By combination of MSRC and other technologies based on bioelectrochemcial system, more valued added process or product can be obtained such as hydrogen, hydrogen peroxide, caustic solution or desalination of sea water.
Furthermore, different strategies to startup MSRC were also been tested. The start-up rate, stability and electricity performance can be largely raised with strategy to inoculate the pre-culture sulfate reducing consortia in log phase at MSRC startup. However, further research is needed to support this hypothesis.
Subjects
微生物燃料電池
硫化物
電化學阻抗分析
SDGs
Type
thesis
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