Electricity production and sludge reduction by integrating microbial fuel cells in anoxic-oxic process

Xiao, Benyi; Luo, Meng; Wang, Xiao; Li, Zuoxing; Hong, Chen; Liu, Junxin; Guo, Xuesong

doi:10.1016/j.wasman.2017.06.046

Cited by 20 publications

(3 citation statements)

References 38 publications

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“…As illustrated in Figure 3f, the applicable denitrification efficiency has occurred between the initial pH values of 6.5±0.5 and 7.5±0.4. The initial pH of 7.5±0.4 seems to be the best condition for the denitrification efficiency achieved 97.7% at 3.5 h. The diversity of microbial immobilization in the 3D-BER system, when the pH was 7.0 ± 0.1-7.5 ± 0.4, denitrification efficiency is high, immobilized microorganisms tend to be neutral in the alkaline environment, which was related with another research work indicating that denitrifying bacteria prefer the pH range of 6.2-8.2 [33,34].…”

Section: The Removal Performance Of Nitrates Under Different Initial supporting

confidence: 66%

Diversity of Immobilized Bacterial Communities and Nitrates Removal by Instantaneous Heterotrophic Denitrification Treating Nitrate-Polluted Water Using 3D-BERs-GAC: Effects of pH and COD/NO3- -N Ratio

Hassan¹,

Zhu²,

Yang³

et al. 2020

Preprint

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In this study, a three-dimensional bioelectrochemical reactor system (3D-BERs) with granular activated carbon (GAC) epitomizes a novel treatment technology for treating nitrate-polluted water. The conventional denitrification process faces many challenges, including the huge demand for organic carbon, long-term accumulation of intermediate products, and the adaptation period. Results shown that under the optimal conditions of the COD/NO3--N ratio was 1.5, the denitrification efficiency reached 98.62%, when compared to 81.12% at COD/ NO3--N ratio of 3.5, and the initial pH of 7.5 ± 0.5, NO3--N was entirely removed at 2.2 h without accumulation of nitrite. The high initial ratio of NO2--N/NO3--N is mainly to accelerate the denitrification rate by accelerating the reduction of nitrite. Denitrification process followed by zero-order kinetics linear model for at different concentrations of inlet NO3--N, and achieved higher denitrification rate at greater inlet NO3--N concentration. High-throughput sequencing shows that the community structure and relative abundance of bacteria changed significantly, especially at the genes and the phyla level in immobilized GAC particles. Microbial composition enhanced the removal of nitrogen at the inner surface (IS) and bottom surface (BS) of immobilized GAC carriers. Therefore, this system is expected to be a more efficient and useful supplement or a cost-effective alternative compared to the traditional low carbon to nitrogen wastewater treatment system.

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Section: The Removal Performance Of Nitrates Under Different Initial supporting

confidence: 66%

Diversity of Immobilized Bacterial Communities and Nitrates Removal by Instantaneous Heterotrophic Denitrification Treating Nitrate-Polluted Water Using 3D-BERs-GAC: Effects of pH and COD/NO3- -N Ratio

Hassan¹,

Zhu²,

Yang³

et al. 2020

Preprint

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“…In addition to the removal of water COD, the SBES was shown to even function efficiently in removing COD and nitrogen contents of the brackish aquaculture sediment, particularly through reducing the sediment amount. Indeed, the use of bioelectrochemical systems such as microbial fuel cells as an efficient solution for sludge reduction in wastewater treatment has been proven [51][52][53] but their application to reduce sediment in aquaculture ponds has not been reported. Partial conversion of the energy in organic matter of sludge to electricity are believed to reduce the cell yield (or biomass production), leading to sludge reduction in wastewater treatment [51][52][53].…”

Section: The Application Potential Of Using the Established Model For The Treatment Of Water And Sediment In Brackish Aquaculture Pondsmentioning

confidence: 99%

“…Indeed, the use of bioelectrochemical systems such as microbial fuel cells as an efficient solution for sludge reduction in wastewater treatment has been proven [51][52][53] but their application to reduce sediment in aquaculture ponds has not been reported. Partial conversion of the energy in organic matter of sludge to electricity are believed to reduce the cell yield (or biomass production), leading to sludge reduction in wastewater treatment [51][52][53]. It is highly possible that the mechanism of in situ sediment reduction by the SBES in a pond model is similar.…”

Section: The Application Potential Of Using the Established Model For The Treatment Of Water And Sediment In Brackish Aquaculture Pondsmentioning

confidence: 99%

A Laboratory-Scale Study of the Applicability of a Halophilic Sediment Bioelectrochemical System for in situ Reclamation of Water and Sediment in Brackish Aquaculture Ponds: Establishment, Bacterial Community and Performance Evaluation

Tran¹,

Vu²,

Nguyen³

et al. 2019

Journal of Microbiology and Biotechnology

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In this study, we investigated the potential of using sediment bioelectrochemical systems (SBESs) for in situ treatment of the water and sediment in brackish aquaculture ponds polluted with uneaten feed. An SBES integrated into a laboratory-scale tank simulating a brackish aquaculture pond was established. This test tank and the control (not containing the SBES) were fed with shrimp feed in a scheme that mimics a situation where 50% of feed is uneaten. After the SBES was inoculated with microbial sources from actual shrimp pond sediments, electricity generation was well observed from the first experimental week, indicating successful enrichment of electrochemically active bacteria in the test tank sediment. The electricity generation became steady after 3 weeks of operation, with an average current density of 2.3 mA/m 2 anode surface and an average power density of 0.05 mW/m 2 anode surface. The SBES removed 20-30% more COD of the tank water, compared to the control. After 1 year, the SBES also reduced the amount of sediment in the tank by 40% and thus could remove approximately 40% more COD and approximately 52% more nitrogen from the sediment, compared to the control. Insignificant amounts of nitrite and nitrate were detected, suggesting complete removal of nitrogen by the system. PCR-DGGE-based analyses revealed the dominant presence of Methylophilus rhizosphaerae, Desulfatitalea tepidiphila and Thiothrix eikelboomii, which have not been found in bioelectrochemical systems before, in the bacterial community in the sediment of the SBES-containing tank. The results of this research demonstrate the potential application of SBESs in helping to reduce water pollution threats, fish and shrimp disease risks, and thus farmers' losses.

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State of the art on granular sludge by using bibliometric analysis

Zheng

et al. 2018

Appl Microbiol Biotechnol

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With rapid industrialization and urbanization in the nineteenth century, the activated sludge process (ASP) has experienced significant steps forward in the face of greater awareness of and sensitivity toward water-related environmental problems. Compared with conventional flocculent ASP, the major advantages of granular sludge are characterized by space saving and resource recovery, where the methane and hydrogen recovery in anaerobic granular and 50% more space saving, 30-50% of energy consumption reduction, 75% of footprint cutting, and even alginate recovery in aerobic granular. Numerous engineers and scientists have made great efforts to explore the superiority over the last 40 years. Therefore, a bibliometric analysis was desired to trace the global trends of granular sludge research from 1992 to 2016 indexed in the SCI-EXPANDED. Articles were published in 276 journals across 44 subject categories spanning 1420 institutes across 68 countries. Bioresource Technology (293, 11.9%), Water Research (235, 9.6%), and Applied Microbiology and Biotechnology (127, 5.2%) dominated in top three journals. The Engineering (991, 40.3%), China (906, 36.9%), and Harbin Inst Technol, China (114, 4.6%) were the most productive subject category, country, and institution, respectively. The hotspot is the emerging techniques depended on granular reactors in response to the desired removal requirements and bio-energy production (primarily in anaerobic granular sludge). In view of advanced and novel bio-analytical methods, the characteristics, functions, and mechanisms for microbial granular were further revealed in improving and innovating the granulation techniques. Therefore, a promising technique armed with strengthened treatment efficiency and efficient resource and bio-energy recovery can be achieved.

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Electricity production and sludge reduction by integrating microbial fuel cells in anoxic-oxic process

Cited by 20 publications

References 38 publications

Diversity of Immobilized Bacterial Communities and Nitrates Removal by Instantaneous Heterotrophic Denitrification Treating Nitrate-Polluted Water Using 3D-BERs-GAC: Effects of pH and COD/NO3- -N Ratio

Diversity of Immobilized Bacterial Communities and Nitrates Removal by Instantaneous Heterotrophic Denitrification Treating Nitrate-Polluted Water Using 3D-BERs-GAC: Effects of pH and COD/NO3- -N Ratio

A Laboratory-Scale Study of the Applicability of a Halophilic Sediment Bioelectrochemical System for in situ Reclamation of Water and Sediment in Brackish Aquaculture Ponds: Establishment, Bacterial Community and Performance Evaluation

State of the art on granular sludge by using bibliometric analysis

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