Roles of biochar media and oxygen supply strategies in treatment performance, greenhouse gas emissions, and bacterial community features of subsurface-flow constructed wetlands

Ji, Bohua; Chen, Jinquan; Mei, Jian; Chang, Junjun; Li, Xuan; Wei, Jia; Qu, Yanghua

doi:10.1016/j.biortech.2020.122890

Cited by 51 publications

(18 citation statements)

References 39 publications

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“…Biochar is an organic carbon-enriched product that is considered a promising alternative substrate (Zhuang et al, 2022). Ji et al (2021) showed that biochar-based CWs contained a higher pmoA/mcrA ratio than none-biochar CWs, with the addition of biochar having an inhibitory effect on CH 4 fluxes, possibly due to biochar promoting the secretion of O 2 from plant roots, increasing CH 4 oxidation (Ji et al, 2020). However, Chen et al (2020a) and Guo et al (2020) proposed contrasting conclusions, finding that CH 4 fluxes were consistently higher in biochar-added CWs than CWs without added biochar.…”

Section: Carbon-rich Substrate Typesmentioning

confidence: 99%

“…Activated alumina is also a powerful adsorption substrate, as shown in a study by Xu G. et al (2021) in which activated alumina significantly reduced CH 4 emissions from CWs due to its strong adsorption capacity, leading to reduction in organic matter content and inhibiting methanogenic microbial activity (Alvarez and Cervantes, 2012). In addition, sand, ceramsite and gravel have also been utilized as adsorption fillers (Table 5; Wang Y. et al, 2020), but they have been gradually replaced due to poor CH 4 adsorption capacities (Ji et al, 2020;Cheng et al, 2021a;Zhao et al, 2022). With a survey of CWs finding that mcrA and pmoA were not detectable in all gravel substrates (Chen et al, 2020c), which was attributed to the fact that methanogens and methanotrophs do not easily attach to gravel so it is gradually replaced.…”

Section: Adsorption Substrate Typesmentioning

confidence: 99%

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Recent advances in constructed wetlands methane reduction: Mechanisms and methods

Chen

Wang

et al. 2023

Front. Microbiol.

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Constructed wetlands (CWs) are artificial systems that use natural processes to treat wastewater containing organic pollutants. This approach has been widely applied in both developing and developed countries worldwide, providing a cost-effective method for industrial wastewater treatment and the improvement of environmental water quality. However, due to the large organic carbon inputs, CWs is produced in varying amounts of CH4 and have the potential to become an important contributor to global climate change. Subsequently, research on the mitigation of CH4 emissions by CWs is key to achieving sustainable, low-carbon dependency wastewater treatment systems. This review evaluates the current research on CH4 emissions from CWs through bibliometric analysis, summarizing the reported mechanisms of CH4 generation, transfer and oxidation in CWs. Furthermore, the important environmental factors driving CH4 generation in CW systems are summarized, including: temperature, water table position, oxidation reduction potential, and the effects of CW characteristics such as wetland type, plant species composition, substrate type, CW-coupled microbial fuel cell, oxygen supply, available carbon source, and salinity. This review provides guidance and novel perspectives for sustainable and effective CW management, as well as for future studies on CH4 reduction in CWs.

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Section: Carbon-rich Substrate Typesmentioning

confidence: 99%

Section: Adsorption Substrate Typesmentioning

confidence: 99%

Recent advances in constructed wetlands methane reduction: Mechanisms and methods

Chen

Wang

et al. 2023

Front. Microbiol.

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“…Both showed promising results in enhancing nutrient removal, though tidal flow proved to be a better method of aeration among the two. The results also revealed that COD removal was not significantly affected by the mode of oxygen supply 87 . In 2011, a study was carried out to evaluate the performance of a lab‐scale tidal flow CW for oxygen transfer capacity and removal of ammonium and organic matter in synthetic wastewater.…”

Section: Enhancing the Performance Of Constructed Wetlands: Modificat...mentioning

confidence: 99%

“…The results also revealed that COD removal was not significantly affected by the mode of oxygen supply. 87 In 2011, a study was carried out to evaluate the performance of a lab-scale tidal flow CW for oxygen transfer capacity and removal of ammonium and organic matter in synthetic wastewater. It was observed that under high organic loading there was suppression in nitrification even though sufficient DO was present.…”

Section: Mode Of Operationmentioning

confidence: 99%

Performance enhancement of constructed wetlands for wastewater remediation by modifications and integration of technologies: A review

Patyal

Jaspal

Khare

2022

Env Prog and Sustain Energy

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Constructed wetland (CW) has gained popularity as an eco‐friendly technology for ease of operation and maintenance. This article critically reviews and summarizes the research carried out to date on several approaches for integration of CW with other methods of treatment, exploring several novel modes of operation and factors, to improve the remediation capacity of the CW system. The study shows that the use of different modes of aeration, recirculation of the effluent, hydraulic retention time, and organic loading rate not only improves the removal efficiency of the treatment system but also helps in reducing the surface area required for the system in the treatment of emerging contaminants. The integrated approach analysis gives an insight into the different technologies, which can be coupled with CW for fast, sustainable, and eco‐efficient treatment systems for different types of wastewater. Anaerobic technologies and microbial fuel cell (MFC) have the added advantage of energy generation apart from wastewater treatment, which helps in reducing carbon footprints. Optimization of pollutant treatment in wastewater and electricity generation by CW‐MFC has emerged to be an upcoming area of research. The study disseminates knowledge about the latest developments in the field of intensified CW technology with a focus on modifications and integrated systems, which help in identifying the potential areas of research worth addressing in the future.

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“…In general, DNA amplicons obtained from sequencing provide information to classify sequences at the phylum level; however, it is common that they cannot be related to orders, families, or genus in NWs (e.g. Horton et al 2019;Xue et al 2020) and CWs (Ji et al 2020). This situation is also observed in archaeal taxonomic groups (Bae et al 2018) and with the taxonomy performed using functional genes (Gu et al 2019).…”

Section: R a F Tmentioning

confidence: 99%

Microorganisms that participate in biochemical cycles in wetlands

Mellado

Vera

2021

Can. J. Microbiol.

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Several biochemical cycles are performed in natural wetlands (NWs) and constructed wetlands (CWs). The knowledge of the microorganisms could be used to monitor the restoration of wetlands or the performance of the wastewater treatment. Regarding bacteria, Proteobacteria phylum is the most abundant in NWs and CWs, which possesses a role in N, P, and S cycles, and in the degradation of organic matter. Other phyla are present in lower abundance. Archaea participate in methanogenesis, methane oxidation, and the methanogenic N2 fixation. Sulfur and phosphorus cycles are also performed by other microorganisms, such as Chloroflexi or Nitrospirae phyla. In general, there is more information about the N cycle, especially nitrification and denitrification. Processes where archaea participate (e.g. methane oxidation, methanogenic N2 fixation) are still unclear their metabolic role and several of these microorganisms have not been isolated so far. The study can use 16S rDNA genes or functional genes. The use of functional genes gives information to monitor specific microbial populations and 16S rDNA is more suitable to perform the taxonomic classification. Also, there are several Candidatus microorganisms, which have not been isolated so far. However, it has been described their metabolic role in the biochemical cycles in wetlands.

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Roles of biochar media and oxygen supply strategies in treatment performance, greenhouse gas emissions, and bacterial community features of subsurface-flow constructed wetlands

Cited by 51 publications

References 39 publications

Recent advances in constructed wetlands methane reduction: Mechanisms and methods

Recent advances in constructed wetlands methane reduction: Mechanisms and methods

Performance enhancement of constructed wetlands for wastewater remediation by modifications and integration of technologies: A review

Microorganisms that participate in biochemical cycles in wetlands

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