Impact of biochar on greenhouse gas emissions from constructed wetlands under various influent chemical oxygen demand to nitrogen ratios

Guo, Fucheng; Zhang, Junmao; Yang, Xiangyu; He, Qiang; Ao, Lianggen; Chen, Yi

doi:10.1016/j.biortech.2020.122908

Cited by 110 publications

(33 citation statements)

References 45 publications

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“…Similar observations of higher N removal during shorter experiments (35-90 d) were reported in other CW studies with biochar amendment compared with nonbiochar CWs (X. Chen et al, 2020;Guo et al, 2020;Liang et al, 2020;. When influent N concentration increased from 67 to 160 mg N L −1 , the biochar-amended CW (50%, v/v) showed stable TN removal performance (47.1 vs. 41.3%), whereas the TN removal efficiency decreased to 19.2-22.1% in 100% gravel CW (Saeed et al, 2019).…”

Section: Biofiltration Systems With Biochar Amendment For N Removalsupporting

confidence: 88%

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Shahraki

Mao

2022

J of Env Quality

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Although conventional on‐site wastewater treatment systems (OWTSs) provide only primary treatment of domestic wastewater, removal of a limited level of nutrients (N, P), pathogens, and pharmaceuticals and personal care products (PPCPs) could be achieved by such a treatment process. Biochar has the capacity to remove various contaminants and has been widely used as an ideal soil amendment in agriculture due to its persistence, superior nutrient‐retention properties, low cost, and ready availability. However, few applications on the use of biochar in onsite wastewater treatment have been explored. In this review, we systematically reviewed the applications of biochar in filtration‐based OWTSs for nutrient (N, P) removal and recovery as well as pathogen and PPCP removal. Although adsorption was the main mechanism for P, pathogen, and PPCP removal, biochar can also serve as the growth media for enhanced biological degradation, improves available alkalinity, and increases water holding capacity in the OWTSs. The biochar source, surface modification methods, and preparation procedures (e.g., pyrolysis temperature change) have significant effects on contaminant removal performance in biochar‐amended OWTSs. Specifically, contradictory results have been reported on the effect of pyrolysis temperature change on biochar removal performance (i.e., increased, decreased, or no change) of N, P, and PPCPs. Wastewater composition and environmental pH also play important roles in the removal of nutrients, pathogens, and PPCPs. Overall, biochar holds great potential to serve as an alternative filtration material or to be amended to the current OWTS to improve system performance in removing a variety of contaminants at low cost.

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Section: Biofiltration Systems With Biochar Amendment For N Removalsupporting

confidence: 88%

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Shahraki

Mao

2022

J of Env Quality

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“…Because N 2 O can generate a 298‐fold effect on global warming compared to CO 2 (IPCC, 2013), the increased N 2 O emissions by acidification could potentially influence global climate change in estuaries. We further assessed N 2 O emission‐based Global Warming Potential (

{GWP}_{N_{2} normalO}

; Table S8) to evaluate the potential warming effect of N 2 O emission from the estuarine ecosystem (Chen et al, 2021; Guo et al, 2020). The

{GWP}_{N_{2} normalO}

at pH 6.8 (in situ estuarine environment) was 0.68 g CO 2 eq m –2 day –1 , similar to those of soil ecosystems (0.05–0.72 g CO 2 eq m –2 day –1 ; Chen et al, 2021) but slightly higher than wetland sediments (0.30–0.60 g CO 2 eq m –2 day –1 ; Du et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Stimulation of N₂O emission via bacterial denitrification driven by acidification in estuarine sediments

Wen

Wang

et al. 2021

Global Change Biology

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Ocean acidification in nitrogen-enriched estuaries has raised global concerns. For decades, biotic and abiotic denitrification in estuarine sediments has been regarded as the major ways to remove reactive nitrogen, but they occur at the expense of releasing greenhouse gas nitrous oxide (N 2 O). However, how these pathways respond to acidification remains poorly understood. Here we performed a N 2 O isotopocules analysis coupled with respiration inhibition and molecular approaches to investigate the impacts of acidification on bacterial, fungal, and chemo-denitrification, as well as N 2 O emission, in estuarine sediments through a series of anoxic incubations.Results showed that acidification stimulated N 2 O release from sediments, which was mainly mediated by the activity of bacterial denitrifiers, whereas in neutral environments, N 2 O production was dominated by fungi. We also found that the contribution of chemo-denitrification to N 2 O production cannot be ignored, but was not significantly affected by acidification. The mechanistic investigation further demonstrated that acidification changed the keystone taxa of sedimentary denitrifiers from N 2 Oreducing to N 2 O-producing ones and reduced microbial electron-transfer efficiency during denitrification. These findings provide novel insights into how acidification stimulates N 2 O emission and modulates its pathways in estuarine sediments, and how it may contribute to the acceleration of global climate change in the Anthropocene.

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“…Studies suggested that CWs were able to remove organics, total carbon, and nutrients effectively (e.g., fecal indicator bacteria removal ranged from 97% to 99%, such as coliforms and Escherichia coli) [35] but also biological contaminants, metals, or emergent pollutants by more than 85% [36]. In these processes, pollutant removal is reached through a combination of physical, chemical, and biological dynamics and efficiency indicators in which all the elements of CWs (plants, microorganisms, and substrates) can have a significant influence [37], including a positive effect on greenhouse gas emissions reduction [38].…”

Section: Introductionmentioning

confidence: 99%

Constructed Wetlands to Face Water Scarcity and Water Pollution Risks: Learning from Farmers’ Perception in Alicante, Spain

Ricart

Amorós

2021

Water

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Treated wastewater is constantly produced and relatively unaffected by climatic conditions, while Constructed Wetlands (CWs) are recognized as green technology and a cost-effective alternative to improve treated wastewater quality standards. This paper analyses how farmers consider (1) treated wastewater to face water scarcity risk and (2) CW as mechanisms to face agricultural water pollution in a climate change adaptation context. A survey about climate change perception and adaptation measures was answered by 177 farmers from two irrigation communities near El Hondo coastal wetland and the Santa Pola saltmarshes, both perceived as natural-constructed systems in Alicante, southern Spain. Results highlighted how, even with poor-quality standards, treated wastewater is considered a non-riskier measure and more reliable option when addressing climate change impacts. Overall, physical water harvesting (such as CWs) is the favorite choice when investing in water technologies, being perceived as the best option for users of treated wastewater and those concerned about water quality standards. Consequently, CWs were recognized as mechanisms to increase water supply and reduce water pollution. Policy-makers and water managers can use these learnings from farmers’ experience to identify the main barriers and benefits of using treated wastewater and CWs to address water scarcity and water pollution risks.

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Impact of biochar on greenhouse gas emissions from constructed wetlands under various influent chemical oxygen demand to nitrogen ratios

Cited by 110 publications

References 45 publications

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Stimulation of N₂O emission via bacterial denitrification driven by acidification in estuarine sediments

Constructed Wetlands to Face Water Scarcity and Water Pollution Risks: Learning from Farmers’ Perception in Alicante, Spain

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Impact of biochar on greenhouse gas emissions from constructed wetlands under various influent chemical oxygen demand to nitrogen ratios

Cited by 110 publications

References 45 publications

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Stimulation of N2O emission via bacterial denitrification driven by acidification in estuarine sediments

Constructed Wetlands to Face Water Scarcity and Water Pollution Risks: Learning from Farmers’ Perception in Alicante, Spain

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Stimulation of N₂O emission via bacterial denitrification driven by acidification in estuarine sediments