Mapping research on carbon neutrality in WWTPs between 2001 and 2021: A scientometric and visualization analysis

Yu, Xin-Lei; Zhao, Zitong; Zhao, Hang; He, Shan; Cui, Chen-Hao; Sun, Han-Jun; Zhao, Yilin; Bai, Shunwen; Dong, Jie; Pang, Ji-Wei; Ding, Jie; Ren, Nanqi; Yang, Shanshan

doi:10.1016/j.horiz.2022.100022

Cited by 23 publications

(6 citation statements)

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“…This observed DO-varying effect of MPs on aerobic N 2 O production has not been reported before and potentially provides a theoretical basis for the development of N 2 O mitigation strategies in wastewater treatment under MP stress. The findings are thus globally significant in view of the rising environmental MP concentrations and potent greenhouse effect of N 2 O. ,, …”

Section: Resultsmentioning

confidence: 96%

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

He,

Liu,

et al. 2024

Environ. Sci. Technol.

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Partial nitritation (PN) is an important partner with anammox in the sidestream line treating high-strength wastewater and primarily contributes to nitrous oxide (N 2 O) emissions in such a hybrid system, which also suffers from ubiquitous microplastics because of the growing usage and disposal levels of plastics. In this study, the influences of polyvinyl chloride microplastics (PVC-MPs) on N 2 O-contributing pathways were experimentally revealed to fill the knowledge gap on N 2 O emission from the PN system under microplastics stress. The long-term results showed that the overall PN performance was hardly affected by the low-dose PVC-MPs (0.5 mg/L) while obviously deteriorated by the high dose (5 mg/L). According to the batch tests, PVC-MPs reduced biomassspecific ammonia oxidation rates (AORs) by 5.78−21.94% and stimulated aerobic N 2 O production by 9.22−88.36%. Further, upon increasing dissolved oxygen concentrations from 0.3 to 0.9 mg O 2 /L, the degree of AOR inhibition increased but that of N 2 O stimulation was lightened. Site preference analysis in combination with metabolic inhibitors demonstrated that the contributions of hydroxylamine oxidation and heterotrophic denitrification to N 2 O production at 0.3 mg O 2 /L were enhanced by 18.84 and 10.34%, respectively, accompanied by a corresponding decreased contribution of nitrifier denitrification. Finally, the underlying mechanisms proposed for negative influences of PVC-MPs were bisphenol A leaching and reactive oxygen species production, which led to more cell death, altered sludge properties, and reshaped microbial communities, further resulting in enhanced N 2 O emission. Overall, this work implied that the ubiquitous microplastics are a hidden danger that cannot be ignored in the PN system.

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Section: Resultsmentioning

confidence: 96%

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

He,

Liu,

et al. 2024

Environ. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

“…In the context of carbon neutrality, the discharge standards for wastewater treatment plants (WWTPs) have been progressively tightening, encompassing not only effluent indicators, but also carbon emissions. 1 Carbon emissions from WWTPs include both indirect and direct emissions. Indirect carbon emissions mainly arise from resource consumption such as electricity and chemicals, while direct carbon emissions primarily result from the generation of greenhouse gases like CO 2 , N 2 O, and CH 4 during biological reaction processes.…”

Section: Introductionmentioning

confidence: 99%

Synchronous Achievement of Advanced Nitrogen Removal and N₂O Reduction in the Anoxic Zone in the AOA Process for Low C/N Municipal Wastewater

An,

Gao,

Shao

et al. 2024

Environ. Sci. Technol.

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Continuous flow processes for the in situ determination of N 2 O emissions during low C/N municipal wastewater treatment have rarely been reported. The anaerobic/ aerobic/anoxic (AOA) process has recently shown promising potential in energy savings and advanced nitrogen removal, but it still needs to be comprehensively explored in relation to N 2 O emissions for its carbon reduction advantages. In this study, a novel gas-collecting continuous flow reactor was designed to comprehensively evaluate the emissions of N 2 O from the gas and liquid phases of the AOA process. Additionally, the measures of enhancing endogenous denitrification (ED) and self-enriching anaerobic ammonium oxidation (Anammox) were employed to optimize nitrogen removal and achieve N 2 O reduction in the anoxic zone. The results showed that enhanced ED coupled with Anammox led to an increase in the nitrogen removal efficiency (NRE) from 67.65 to 81.96%, an enhancement of the NO 3 − removal rate from 1.76 mgN/(L h) to 3.99 mgN/(L h), and the N 2 O emission factor in the anoxic zone decreased from 0.28 to 0.06%. Impressively, ED eliminated 91.46 ± 2.47% of the dissolved N 2 O from the upstream aerobic zone, and the dissolved N 2 O in the effluent was reduced to less than 0.01 mg/L. This study provides valuable strategies for fully evaluating N 2 O emissions and N 2 O reduction from the AOA process.

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“…Water pollution remains a persistent and complex issue in global environmental protection, compounded by the escalating concentration of emerging pollutants such as pharmaceuticals, personal care products (PPCPs), and endocrine disrupting chemicals (EDCs). These emerging pollutants are particularly concerning due to their toxicity and resistance to degradation, posing significant threats to both human health and the environment. − Conventional sewage treatment methods have proven inadequate, and environmental policies are driving the need for technological upgrades. , Advanced oxidation processes (AOPs) are highly anticipated as a potential solution, due to their ability to mineralize organic compounds (OCs) into harmless byproducts via the production of reactive oxygen species (ROS) with high oxidation potential. , AOP can treat wastewater from multiple sources and is capable of transforming waste into catalysts necessary for this progress, making it an ideal candidate for sustainable green development. − …”

Section: Introductionmentioning

confidence: 99%

Current Mechanism of Peroxymonosulfate Activation by Cobalt-Based Heterogeneous Catalysts in Degrading Organic Compounds

et al. 2023

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Persulfate based advanced oxidation processes (PS-AOPs) have been regarded as a mainstream degradation technology of organic compounds due to their high efficiency in wastewater treatment. In particular, peroxymonosulfate (PMS) has a unique structure and chemical properties, which can be efficiently activated by Co-based catalysts to produce active species with a high oxidation potential. These active species usually determine the subsequent degradation of organic compounds in an efficient process, while the intrinsic reaction mechanism behind this complex process remains unclear and therefore impedes the continual development in this scientific community. Recently, density functional theory (DFT) calculations have emerged as a powerful means to identify the electronic properties and distinguish energy changes in the PMS activation system. With the assistance of this quantum calculation, increasing investigations have been conducted focusing on explaining the phenomenon that occurred in experiments. However, these calculations mainly contributed in part to the reaction mechanism of PMS activation by Co-based catalysts and sometimes even differ from each other, lacking a comprehensive summary based on DFT calculation results. In this review, we introduce the main uses of DFT in the catalytic activation of PMS, provide recent application of calculation examples of Co-based heterogeneous catalysts with different structures, and then discuss the mechanism of PMS activation in detail. Finally, the research results of the DFT method in this field are summarized, and the future research focus and challenges are put forward, which is conducive to guiding the practical design of Co-based catalysts and further application of PS-AOPs in creating value products.

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Mapping research on carbon neutrality in WWTPs between 2001 and 2021: A scientometric and visualization analysis

Cited by 23 publications

References 50 publications

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

Synchronous Achievement of Advanced Nitrogen Removal and N₂O Reduction in the Anoxic Zone in the AOA Process for Low C/N Municipal Wastewater

Current Mechanism of Peroxymonosulfate Activation by Cobalt-Based Heterogeneous Catalysts in Degrading Organic Compounds

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Mapping research on carbon neutrality in WWTPs between 2001 and 2021: A scientometric and visualization analysis

Cited by 23 publications

References 50 publications

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

Polyvinyl Chloride Microplastics Facilitate Nitrous Oxide Production in Partial Nitritation Systems

Synchronous Achievement of Advanced Nitrogen Removal and N2O Reduction in the Anoxic Zone in the AOA Process for Low C/N Municipal Wastewater

Current Mechanism of Peroxymonosulfate Activation by Cobalt-Based Heterogeneous Catalysts in Degrading Organic Compounds

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Synchronous Achievement of Advanced Nitrogen Removal and N₂O Reduction in the Anoxic Zone in the AOA Process for Low C/N Municipal Wastewater