Insight into greenhouse gases emissions from the two popular treatment technologies in municipal wastewater treatment processes

Nguyen, Thi Kieu Loan; Ngo, Huu Hao; Guo, Wenshan; Chang, Soon Woong; Nguyen, Dinh Duc; Liu, Yiwen; Ni, Bing‐Jie; Hai, Faisal I.

doi:10.1016/j.scitotenv.2019.03.386

Cited by 93 publications

(29 citation statements)

References 69 publications

(98 reference statements)

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“…As one of the greenhouse gases, methane effects on global warming. Hence, its emissions have attracted more and more attention [125]. The conversion of CH 4 into chemicals is much more economical and energy-efficient compared to CO 2 .…”

Section: Selective Catalytic Oxidation Of Methanementioning

confidence: 99%

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

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This paper mainly focuses on the application of nanostructured MoO 3 materials in both energy and environmental catalysis fields. MoO 3 has wide tunability in bandgap, a unique semiconducting structure, and multiple valence states. Due to the natural advantage, it can be used as a high-activity metal oxide catalyst, can serve as an excellent support material, and provide opportunities to replace noble metal catalysts, thus having broad application prospects in catalysis. Herein, we comprehensively summarize the crystal structure and properties of nanostructured MoO 3 and highlight the recent significant research advancements in energy and environmental catalysis. Several current challenges and perspective research directions based on nanostructured MoO 3 are also discussed.Molecules 2020, 25, 18 2 of 26 applications in energy and environmental catalysis on account of their relatively low cost, high activity, and stability [9][10][11][12].Molybdenum oxide (MoO 3 ), a kind of transition metal oxide with a n-type semiconducting, nontoxic nature and high stability, has attracted a lot of attention. In particular, nanostructured MoO 3 has demonstrated superior properties to bulk MoO 3 , which is successfully employed in rechargeable batteries [13], capacitors [14], photocatalysis [15], electrocatalysis [16], gas sensors [17], and other applications [6]. The extended tunnels between the MoO 6 octahedra in MoO 3 are suitable for insert/de-insert mobile ions, such as H + and Li + , and multiple oxidation states can enable rich redox reactions. Moreover, the superiorities of low cost, chemical stability, high theoretical specific capacity (1117 mA·h/g), and the environmentally friendly nature make nanostructured MoO 3 exceptional electrode materials for rechargeable batteries capacitors [13,18]. MoO 3 has been investigated as the photocatalyst in terms of its anisotropic layered structure for absorbing UV, as well as visible light. Introducing a defect band by H + intercalation or oxygen vacancies can create defect state and decrease MoO 3 bandgap, which effectively increase the photocatalytic activity [15]. Each oxygen atom bonds to only one molybdenum atom of MoO 6 octahedra, and oxygen vacancy generates Mo dangling bond. MoO 3 favors the adsorption of water molecules in oxygen vacancies, which act as electron acceptors and consequently reduce the energy barrier make it highly reactive for electrocatalysis [2,19]. As a good gasochromic material, MoO 3 has efficient positive-ion accommodation and good charge transfer, and it can be used as an optical-based gas sensor. Moreover, relying on the change in the conductance of the oxide-on-gas adsorption/reaction, MoO 3 has been used for NO, NO 2 , CO, H 2 , NH 3 , and other gases [17]. The unique structure strongly affects the performances. Large efforts have been made to obtain nanostructured MoO 3 with appealing properties by engineering multiple synthetic strategies for the applications in various fields. A variety of methods have been developed, including hydrothermal met...

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Section: Selective Catalytic Oxidation Of Methanementioning

confidence: 99%

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

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“…The most frequent contaminants are domestic waste (~2 million tonnes per day), industrial wastes and chemicals, agricultural pesticides and fertilizers 2,4 . The implications of wastewater discharges include, but are not limited to: degraded aquatic ecosystems 5,6 ; decreased biodiversity 7 ; increased greenhouse gas emissions 8,9 ; and a wide range of detrimental impacts to human health 10 . Global wastewater volumes are increasing at unprecedented rates as a result of population growth, rapid urbanisation and economic development, and these drivers are concentrated in coastal regions [11][12][13][14] .…”

Section: Background and Summarymentioning

confidence: 99%

A novel real-world ecotoxicological dataset of pelagic microbial community responses to wastewater

et al. 2020

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Real-world observational datasets that record and quantify pressure-stressor-response linkages between effluent discharges and natural aquatic systems are rare. With global wastewater volumes increasing at unprecedented rates, it is urgent that the present dataset is available to provide the necessary information about microbial community structure and functioning. Field studies were performed at two time-points in the austral summer. Single-species and microbial community whole effluent toxicity (WET) testing was performed at a complete range of effluent concentrations and two salinities, with accompanying environmental data to provide new insights into nutrient and organic matter cycling, and to identify ecotoxicological tipping points. the two salinity regimes were chosen to investigate future scenarios based on a predicted salinity increase at the study site, typical of coastal regions with rising sea levels globally. Flow cytometry, amplicon sequencing of 16S and 18S rRNA genes and micro-fluidic quantitative polymerase-chain reactions (MFQPCR) were used to determine chlorophyll-a and total bacterial cell numbers and size, as well as taxonomic and functional diversity of pelagic microbial communities. this strong pilot dataset could be replicated in other regions globally and would be of high value to scientists and engineers to support the next advances in microbial ecotoxicology, environmental biomonitoring and estuarine water quality modelling.

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“…GHG emissions from two common treatment technologies, anaerobic/anoxic/oxic (AAO) and sequencing batch reactor (SBR), were investigated (Nguyen et al., 2019). Based on literature study of different WRRFs, the emission rate from SBR was 374 gCO 2 e/m 3 , doubled that of AAO, with CH 4 and N 2 O emissions about 2.8 and 4.3 times higher, respectively.…”

Section: Ghg Emissions From Wrrfsmentioning

confidence: 99%

Gaseous emissions from wastewater facilities

Koh¹,

Shaw²

2020

Water Environment Research

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A review of the literature published in 2019 on topics relating to gaseous emissions from wastewater facilities is presented. This review is divided into the following sections: odorant emissions from Water Resource Recovery Facilities (WRRFs); greenhouse gas (GHG) emissions; gaseous emissions from wastewater collection systems; physiochemical odor/emissions control methods; biological odor/emissions control methods; odor/GHG characterization and monitoring; and odor impacts/risk assessments.

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Insight into greenhouse gases emissions from the two popular treatment technologies in municipal wastewater treatment processes

Cited by 93 publications

References 69 publications

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

A novel real-world ecotoxicological dataset of pelagic microbial community responses to wastewater

Gaseous emissions from wastewater facilities

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