Enhanced nitrogen removal of constructed wetlands by coupling with the bioelectrochemical system under low temperature: Performance and mechanism

Fang, Yingke; Wang, Hongcheng; Han, Jinglong; Li, Zhiling; Wang, Aijie

doi:10.1016/j.jclepro.2022.131365

Cited by 33 publications

(3 citation statements)

References 48 publications

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“…Denitrifying bacteria's growth was relatively sluggish due to the restricted carbon source content, and the denitrification effect was also relatively gradual. The anoxic phase resulted from the reflux of nitrification liquid, which inhibited denitrifying microorganisms to some extent and influenced denitrification [34,35]. The oxic tank, on the other hand, did not contribute to TN removal since only the existing form of nitrogen was transformed during the nitrification reaction in the oxic stage.…”

Section: Total Nitrogen Removal Performance and Mechanismmentioning

confidence: 99%

Municipal Sewage Treatment Technology: A2/O-VMBR Integrated Technology for Municipal Treatment and Improved Pollutant Removal

Han

Lyu

et al. 2023

Water

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To modernize wastewater treatment plants, a pilot-scale anaerobic/anoxic/oxic-vibrating membrane bioreactor (A2/O-VMBR) was developed and successfully operated. Despite a low C/N ratio, the A2/O-VMBR achieved removal rates of 61.10%, 93.77%, 72.86%, and 54.75% for COD, TN, TP, and NH3-N, respectively. The maximum and extremity transmembrane pressures were 45 kPa, and 80 kPa, respectively, with no sludge bulking observed. The VMBR saved over 96–98% of energy compared to traditional MBR plants, making it a better option for municipal wastewater treatment. High-throughput sequencing analysis revealed identical bacterial population structures in samples obtained from the treatment units, with genera having nitrifying, denitrifying, hydrolyzing, and glycogen-accumulating activities, which allowed for nitrogen removal. The key functional microorganisms responsible for nitrification–denitrification were species belonging to the genera FCPU426, Fusobacteria, Planctomycetes, Verrucomicrobia, and Epsilonbacteraeota. The integrated experimental system produced favorable results in improving wastewater quality, highlighting the usability of the A2/O-VMBR technology. Therefore, this technique holds potential for further investigation into the context of wastewater treatment and recovery.

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Section: Total Nitrogen Removal Performance and Mechanismmentioning

confidence: 99%

Municipal Sewage Treatment Technology: A2/O-VMBR Integrated Technology for Municipal Treatment and Improved Pollutant Removal

Han

Lyu

et al. 2023

Water

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“…These findings underscore the significant challenges associated with the independent implementation of METs. Numerous studies have proposed the integration of METs with traditional techniques as an effective method for improving the efficiency of wastewater treatment and energy recovery. − It has been shown that incorporating METs into constructed wetlands can boost denitrification efficiency and reduce greenhouse gas emissions during denitrification . METs can also be used for the degradation of recalcitrant pollutants in conventional treatment processes, including p -chloronitrobenzene and petroleum hydrocarbons. , Moreover, METs have been proposed as a regulator in anaerobic digestion to enhance methane generation rate by altering community composition and interspecies electron transfer pathways …”

Section: Introductionmentioning

confidence: 99%

“…5−8 It has been shown that incorporating METs into constructed wetlands can boost denitrification efficiency and reduce greenhouse gas emissions during denitrification. 9 METs can also be used for the degradation of recalcitrant pollutants in conventional treatment processes, including p-chloronitrobenzene and petroleum hydrocarbons. 10,11 Moreover, METs have been proposed as a regulator in anaerobic digestion to enhance methane generation rate by altering community composition and interspecies electron transfer pathways.…”

Section: Introductionmentioning

confidence: 99%

Vulnerable Methanogenic Community in Microbial Electrolysis Cells Alters Electron Allocation in Response to Community Coalescence

Shen,

Xue,

Zhang

et al. 2024

ACS EST Eng.

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The integration of microbial electrochemical technologies (METs) and conventional wastewater treatment units has become a promising pathway to enhance energy recovery from wastewater treatment plants, but how the microbial communities from these two systems interact with and affect each other remains unknown. This study investigated the performance and microbial diversity under community coalescence by introducing activated sludge (AS) into typical microbial electrolysis cells (MECs). When coupled with AS, the electrochemical active surface area (ECSA) of the anode significantly increased from 1.67 to 2.97 mF/m 2 , which could be ascribed to the retention of porous flocs on the electrode surface. However, the anodic Coulombic efficiency was stable under sludge introduction, even with stronger electron transfer capacity. The increased mcrA gene copies of anodic methanogens could indicate enhanced competition in electron allocation to methane rather than to the anode, thereby maintaining the anodic Coulombic efficiency. The energy efficiency and cathodic Coulombic efficiency were enhanced by improving the hydrogen production from 0.018 ± 0.011 to 0.161 ± 0.136 m 3 /m 3 •d, which was likely due to the lower cathodic methanogenesis activity that promoted the electron allocation to hydrogen instead of methane. Isotope verification indicated that acetoclastic methanogenesis was the predominant pathway for methanogenesis throughout the operation, but a temporary increase in the hydrogenotrophic pathway was observed in response to community coalescence (αc = 0.44), indicating that acetoclastic methanogenesis could be inhibited. Overall, the methanogenic community could be more vulnerable during the integration of METs with traditional wastewater treatment technology; specifically, acetoclastic methanogenesis could be shocked in response to community coalescence. These findings provide an insight into the integration of METs with traditional wastewater treatment units from the microbial perspective.

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Recent advances and prospects of constructed wetlands in cold climates: a review from 2013 to 2023

Li,

Ren,

Kou

et al. 2024

Environ Sci Pollut Res

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Enhanced nitrogen removal of constructed wetlands by coupling with the bioelectrochemical system under low temperature: Performance and mechanism

Cited by 33 publications

References 48 publications

Municipal Sewage Treatment Technology: A2/O-VMBR Integrated Technology for Municipal Treatment and Improved Pollutant Removal

Municipal Sewage Treatment Technology: A2/O-VMBR Integrated Technology for Municipal Treatment and Improved Pollutant Removal

Vulnerable Methanogenic Community in Microbial Electrolysis Cells Alters Electron Allocation in Response to Community Coalescence

Recent advances and prospects of constructed wetlands in cold climates: a review from 2013 to 2023

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