Variations in CH4 and CO2 productions and emissions driven by pollution sources in municipal sewers: An assessment of the role of dissolved organic matter components and microbiota

Chen, Hao; Ye, Jianfeng; Wang, Zhongning; Jia, Qiang; Nie, Yun-Han; Li, Lei; Liu, Hui; Benoit, Gaboury

doi:10.1016/j.envpol.2020.114489

Cited by 25 publications

(13 citation statements)

References 56 publications

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“…This result suggests that by changing the profile of the bacterial community, microalgal growth could effectively lower the risks of pathogenic bacteria. In addition, it has been reported that some microorganisms of Bacteroidetes could degrade large‐molecular‐weight or undissolved carbohydrates and yield formic acid, acetic acid and propionic acid 21,22 . To identify the specific functions of major bacterial species of Bacteroidetes and Firmicutes, which are the most abundant phyla in S2, analysis was further conducted at the genus level.…”

Section: Resultsmentioning

confidence: 99%

Microalgae for nutrient recycling from food waste to aquaculture as feed substitute: a promising pathway to eco‐friendly development

Deng

Chen

Liao

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The discharge of food waste and eutrophication in aquaculture could cause environmental pollution and ecological disasters in the hydrosphere. Herein, a novel model of growing microalgae to recover nutrients from food waste and produce feed substitute for aquaculture is proposed. RESULTS: This study developed different methods to pretreat soybean fermentation effluent (SFE) and assessed the contribution of algal growth to nutrient recovery from SFE. Particularly, change of bacterial community was analyzed to explore the interaction between microalgae and bacteria in SFE remediation. In addition, the inclusion level of microalgae in fish diet was optimized and the effect of fresh microalgae on the aquaculture environment was studied. The results showed that unsterilized SFE with appropriate dilution is favorable for microalgal growth and biomass accumulation. Interaction between microalgae and acidogenic bacteria, including Prevotella sp., Acidaminococcus sp. and Lactobacillus sp., favored nutrient recovery from SFE. Removal efficiency of chemical oxygen demand, total nitrogen, total phosphorus and total ammonia‐nitrogen in SFE reached 95.66%, 35.35%, 57.70% and 42.21%, respectively. As the optimal inclusion level of microalgae in fish diet was set as 25%, body length and weight of Micropterus salmoides increased by 13.85 mm and 1.73 g in 44‐day culture. It was also found that fresh microalgae added in fish diet could effectively keep the ammonia concentration in aquaculture system at a lower level. CONCLUSION: The implementation of this model will be of importance to circular economies integrating food waste remediation and eco‐friendly aquaculture. © 2021 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

Microalgae for nutrient recycling from food waste to aquaculture as feed substitute: a promising pathway to eco‐friendly development

Deng

Chen

Liao

et al. 2021

J of Chemical Tech & Biotech

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“…Norank_f__Saprospiracea, which facilitated lysis-cryptic growth for sludge reduction, 8,10 was greatly enriched in ASSR 6.7 (8.2%) compared with ASSR 5.0 (5.9%) and ASSR 2.5 (5.9%). Candidatus_Competibacter was reported to promote the homogeneity of the microbial community structure in the entire degradation system 47 and had the relative abundance with the increasing order of ASSR 2.5 (0.9%), ASSR 5.0 (2.1%), and ASSR 6.7 (2.6%). Fermentation of hydrolysate promoted the enrichment of anaerobic hydrolytic bacteria and thus played indirect roles in particle hydrolysis.…”

Section: Resultsmentioning

confidence: 99%

Bacterial and Microfauna Mechanisms for Sludge Reduction in Carrier-Enhanced Anaerobic Side-Stream Reactors Revealed by Metagenomic Sequencing Analysis

Jiang

Zhou

Jiang

et al. 2021

Environ. Sci. Technol.

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Packing carriers into the anaerobic side-stream reactor (ASSR) can enhance sludge reduction and save footprint by investigating ASSR-coupled membrane bioreactors (AP-MBRs) under different hydraulic residence times of the ASSR (HRT SR ). Three AP-MBRs and an anoxic-aerobic MBR (AO-MBR) showed efficient chemical oxygen demand (>94.2%) and ammonium nitrogen removal (>99.3%). AP-MBRs have higher (p < 0.05) total nitrogen (61.4−67.7%) and total phosphorus (57.5−63.8%) removal than AO-MBRs (47.8 and 47.7%). AP-MBRs achieved sludge reduction efficiencies of 11.8, 31.8, and 36.2% at HRT SR values of 2.5, 5.0, and 6.7 h. Packing carriers greatly improved sludge reduction under low HRT SR and is promising for accelerating sludge reduction in compact space. Metagenomic sequencing analysis showed that genes responsible for metabolism were enriched in AO-MBRs, while genes related to cellular motility and cell signaling were more abundant in the AP-MBRs. A longevity-regulating pathway showed that long lifespan provided more opportunities for worms to prey bacteria. Microscopic examination revealed that some specific protozoa (Arcella, Clathrulina, Aspidisca, Litonotus, Chiloclonella, and Vorticella) and metazoa (Rotaria and Aeolosoma hemprichi) were enriched in ASSRs. Aeolosoma hemprichi was only detected in ASSRs, and unique Cylops appeared on carriers. These results contribute to growing understanding of micrometabolic mechanisms including functional genes and microfauna-driving sludge reduction.

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“…Moreover, CH 4 emissions from lakes in Mexico varied from 5 to 5,000 mg CH 4 m −2 d −1 , with the highest emissions from hypereutrophic lakes (Gonzalez‐Valencia et al., 2014). In general, there is a positive relationship between nutrient loading and CH 4 emissions (Chen et al., 2020) due to increased carbon availability providing more substrate for methanogenesis (Conrad, 2020; King et al., 1984). Additionally, water pollution with heavy metals has been reported to increase CH 4 emissions in mangroves due to a decrease in the richness of microbial functional types, but not of methanogens, which are highly tolerant of heavy metals and can enhance their activity with less competition for organic resources (Ma et al., 2021).…”

Section: Anthropogenic Factors Affecting Ch4 Emissions From Tropical ...mentioning

confidence: 99%

Assessing Methane Emissions From Tropical Wetlands: Uncertainties From Natural Variability and Drivers at the Global Scale

Murguia‐Flores,

Jaramillo,

Gallego‐Sala

2023

Global Biogeochemical Cycles

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Methane (CH4) emissions from tropical wetlands represent half of the global wetland emissions, but uncertainties remain concerning the extent of tropical methane sources. One limitation is to conceive tropical wetlands as a single ecosystem, especially in global land surface models. We estimate CH4 emissions and assess their environmental and anthropogenic drivers. We created a dataset with 101 studies involving 328‐point measurements, classified the sites into four wetland types, and included relevant biological and environmental information. We estimate the global CH4 emission rate from tropical wetlands as 35 (5‐160) mg CH4 m‐2 d‐1 (median, first and third quartile) and an annual global rate of 94 (56, 158) Tg y‐1. Fluxes differed among the wetland types, but except for anthropogenic factors, significant environmental drivers at the global scale could not be quantitatively identified due to high flux variability, even within wetland types. Coastal wetlands generate median emissions of 12(5‐23) Tg y‐1. Inland deep‐water wetlands emit 53 (32‐114) Tg y‐1, with highly variable areal extent. Emissions from inland shallow‐water wetlands are 52(33‐78) Tg y‐1 with variation due to seasonal changes in water table level. Human‐made wetlands emit 17 (10‐4) Tg y‐1. Pollution and N inputs from agriculture are significant anthropogenic drivers of emissions from tropical wetlands. Specific drivers of change need to be considered according to wetland type when estimating global emissions, as well as their specific vulnerability to global change. Additionally, these differences should be contemplated when implementing wetland management practices aimed at decreasing methane emissions.This article is protected by copyright. All rights reserved.

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Variations in CH4 and CO2 productions and emissions driven by pollution sources in municipal sewers: An assessment of the role of dissolved organic matter components and microbiota

Cited by 25 publications

References 56 publications

Microalgae for nutrient recycling from food waste to aquaculture as feed substitute: a promising pathway to eco‐friendly development

Microalgae for nutrient recycling from food waste to aquaculture as feed substitute: a promising pathway to eco‐friendly development

Bacterial and Microfauna Mechanisms for Sludge Reduction in Carrier-Enhanced Anaerobic Side-Stream Reactors Revealed by Metagenomic Sequencing Analysis

Assessing Methane Emissions From Tropical Wetlands: Uncertainties From Natural Variability and Drivers at the Global Scale

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