Enhanced biohydrogen production from waste activated sludge in combined strategy of chemical pretreatment and microbial electrolysis

Wang, Ling; Liu, Wenzong; Ling-ling, Kang; Yang, Chunxue; Zhou, Aijuan; Wang, Aijie

doi:10.1016/j.ijhydene.2014.06.006

Cited by 78 publications

(46 citation statements)

References 27 publications

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“…As a result, low acetate concentration was consistently reported in anaerobic digestion systems coupled with the MEC reactions Guo et al, 2013;Choi and Ahn, 2014;Wang et al, 2014;Asztalos and Kim, 2015). These literature articles strongly indicate that the presence of the MEC reactions reduces acetate concentration and thus leads to supplementing the rate-limiting acetoclastic methanogenesis reaction.…”

Section: Acetoclastic Methanogenesis At 6-day Srtmentioning

confidence: 86%

Lab-Scale Experiment and Model Study on Enhanced Digestion of Wastewater Sludge using Bioelectrochemical Systems

Asztalos¹,

Kim²

2015

J ENV INFORM

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ABSTRACT. Anaerobic digestion is the slowest process in municipal wastewater treatment, requiring at least 15 days of SRT (solids retention time). Here, we implemented microbial electrolysis cells (MECs) in anaerobic digesters to shorten the long SRT requirement. The MEC bioanode oxidizes acetic acid while the cathode produces H2 gas. The electrode reactions can expedite acetic acid decomposition and thus enhance the rate of biosolids destruction because acetoclastic methanogenesis is known to be the rate-limiting step in conventional anaerobic digestion. A lab-scale electrically-assisted digester (EAD) with the MEC reactions was operated under a continuous fed-batch mode using raw wastewater sludge. Additionally, a steady-state model was developed by incorporating the MEC reaction in ADM1 (Anaerobic Digestion Model No.1 by International Water Association). In experiments, the EAD achieved 55% VSS (volatile suspended solids) removal and 61% COD (chemical oxygen demand) removal at a 6-day SRT while the control digester (built with the same electrode components but no MEC reactions induced) showed only 47% VSS removal and 50% COD removal. This result indicates that the SRT requirement can be substantially reduced by implementing the MEC reactions in mesophilic anaerobic digestion. Under a 14-day or 2-day SRT condition, however, the EAD did not show meaningful improvements on the COD and VSS removal compared to the control digester. Hydrogenotrophic methanogenesis was sufficiently rapid as H2 gas was not detected in produced biogas. The mathematical simulation results demonstrated that the MEC reactions substantially reduce acetic acid concentration and thus supplement the slow acetoclastic methanogenesis reaction.

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Section: Acetoclastic Methanogenesis At 6-day Srtmentioning

confidence: 86%

Lab-Scale Experiment and Model Study on Enhanced Digestion of Wastewater Sludge using Bioelectrochemical Systems

Asztalos¹,

Kim²

2015

J ENV INFORM

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“…The activated sludge for this research as seed bacterial culture was procured from Harbin Wenchang Wastewater Treatment Plant (Wang et al, 2014) Fig. 1 -Photograph of the microbial fuel cell used in this work.…”

Section: Inoculation and Start-up Of Mfcsmentioning

confidence: 99%

Performance of low temperature Microbial Fuel Cells (MFCs) catalyzed by mixed bacterial consortia

Tkach

Sangeetha

Maria³

et al. 2017

Journal of Environmental Sciences

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Microbial Fuel Cells (MFCs) are a promising technology for treating wastewater in a sustainable manner. In potential applications, low temperatures substantially reduce MFC performance. To better understand the effect of temperature and particularly how bioanodes respond to changes in temperature, we investigated the current generation of mixed-culture and pure-culture MFCs at two low temperatures, 10°C and 5°C. The results implied that the mixed-culture MFC sustainably performed better than the pure-culture (Shewanella) MFC at 10°C, but the electrogenic activity of anodic bacteria was substantially reduced at the lower temperature of 5°C. At 10°C, the maximum output voltage generated with the mixed-culture was 540-560 mV, which was 10%-15% higher than that of Shewanella MFCs. The maximum power density reached 465.3 ± 5.8 mW/m 2 for the mixed-culture at 10°C, while only 68.7 ± 3.7 mW/m 2 was achieved with the pure-culture. It was shown that the anodic biofilm of the mixed-culture MFC had a lower overpotential and resistance than the pure-culture MFC. Phylogenetic analysis disclosed the prevalence of Geobacter and Pseudomonas rather than Shewanella in the mixed-culture anodic biofilm, which mitigated the increase of resistance or overpotential at low temperatures.

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“…S2). In order to confirm the decolorization of AO7 was due to the cleavage of the azo bound, one of the reduced products, sulfanilic acid (SA), was measured in the effluents (Yemashova et al, 2004). As shown in SI, Fig.…”

Section: Decolorization Performance With Domestic Wastewater As Electmentioning

confidence: 99%

“…3). Because the DEs of all reactors were almost the same and the reduced products of AO7 are stable under anaerobic condition (Yemashova et al, 2004), the variety of COD removal was most likely the result of the different consumption of the electron donor sources. The removed COD in R DW was shown as the lowest, which was followed by the R Glu and then by the R Ac .…”

Section: Decolorization Performance With Domestic Wastewater As Electmentioning

confidence: 99%

Azo dye decolorization in an up-flow bioelectrochemical reactor with domestic wastewater as a cost-effective yet highly efficient electron donor source

Cui

Gao

et al. 2016

Water Research

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a b s t r a c tA major challenge of employing bioelectrochemical system (BES) for reductively degrading recalcitrant contaminants in industrial wastewater is lacking sufficient electron donors. In this work, domestic wastewater (DW) was demonstrated to efficiently drive BES for implementing the decolorization of azo dye, acid orange 7 (AO7). Side benefit was the simultaneous treatment of DW. Decolorization efficiency in BES fed with DW (R DW ) was found to be comparable with that either fed with glucose (R Glu ) or acetate (R Ac ). Much lower reductant usage ratio was observed in R DW . As a result, when the ratio of electron donors to azo dye decreased to 4.4 mol COD mol À1 AO7, DE of R DW kept over 90% while DEs of R Ac and R Glu were significantly dropped due to the insufficient electrons donation. Besides serving as electron donor, DW was proved to also provide some conductivity and buffer capacity. Accordingly, DE of R DW was less deteriorated when fully removing the external buffer slats. This study comprehensively revealed the feasibility and superiority of DW as a cost-effective electron donor source in BES and brings this technology closer to the practice.

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Enhanced biohydrogen production from waste activated sludge in combined strategy of chemical pretreatment and microbial electrolysis

Cited by 78 publications

References 27 publications

Lab-Scale Experiment and Model Study on Enhanced Digestion of Wastewater Sludge using Bioelectrochemical Systems

Lab-Scale Experiment and Model Study on Enhanced Digestion of Wastewater Sludge using Bioelectrochemical Systems

Performance of low temperature Microbial Fuel Cells (MFCs) catalyzed by mixed bacterial consortia

Azo dye decolorization in an up-flow bioelectrochemical reactor with domestic wastewater as a cost-effective yet highly efficient electron donor source

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