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A fine-scale atlas reveals the systematic imbalance between carbon emissions and economic benefits along value chain within China

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Science of the Total environment 2024年 957卷 177311页

作者： Xiong, Yiling Tian, Xin Kang, Ailin School of Environment Beijing Normal University Beijing100875 China State Key Laboratory of Water Environment Simulation Beijing Normal University Beijing100875 China Current affiliation: School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing100084 China

In efforts to achieve the aspiring carbon mitigation goals, China is actively seeking to reconcile the economic development and carbon reduction with diverse regional conditions. Here, we firstly integrated a national-wide atlas on the labor division of production, and decomposed value added and carbon emission along China's domestic value chain during 2007–2017. We found that the value chain roles lead to a systematic imbalance between value added and carbon emissions across regions. Over 70 % of sufferers of the inequality were located at the north, most of which were in the upstream position to supply resource and energy intermediate products of higher on-site emissions and relatively less value added in comparison to the downstream manufacturing and service products production at the coastal regions. As a result, the northern inland suffered a great deal while part of coastal regions and southern inland were beneficiaries in the participation in domestic value chain. In particular, several regions inevitably undertake industries with higher emission intensity and less gains in a sound domestic industrial chain. These strongly call for a systematically policy- or price-based mechanism to explore fair strategy for emission reduction. © 2024 Elsevier B.V.

关键词： Low emission

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Nitrogen Removal Characteristics of a Novel Bacterium Klebsiella Sp. Tsh15 by Assimilatory/Dissimilatory Nitrate Reduction and Ammonia Assimilation

SSRN

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SSRN 2023年

作者： Ren, Jilong Liu, Yanchen Huang, Xia State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

A novel HNAD strain with excellent nitrogen metabolic ability was screened and identified as Klebsiella sp. TSH15 by 16S rRNA. The results demonstrated that the ammonia-N and nitrate-N removal rates were 2.99 mg/L/h and 2.53 mg/L/h under optimal conditions, respectively. The analysis of the whole genome indicated that strain TSH15 contained the key genes involved in assimilatory/dissimilatory nitrate reduction and ammonia assimilation, including nas, nar, nir, nor, glnA, gltB, gdhA, and amt. The relative expression levels of key nitrogen removal genes were further detected by RT-qPCR. The results indicated that the N metabolic pathways of strain TSH15 were the conversion of nitrate or nitrite to ammonia by assimilatory/dissimilatory nitrate reduction (NO3−→NO2−→NH4+) and further conversion of ammonia to glutamate (NH4+-N → Glutamate) by ammonia assimilation. These results indicated that the strain TSH15 had the potential to be applied to practical sewage treatment in the future. © 2023, The Authors. All rights reserved.

关键词： Nitrogen removal

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Aerobic granular sludge formation based on substrate availability:Effects of flow pattern and fermentation pretreatment

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Frontiers of environmental Science & Engineering 2020年第3期14卷 155-164页

作者： Quan Yuan Hui Gong Hao Xi Kaijun Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

The influences of flow patterns(mixed-flow and plug-flow)and fermentation pretreatment on aerobic granular sludge(AGS)formation with various substrate availability levels were investigated by running four identical laboratory-scale sequencing batch reactors(R1-R4),comparing two anaerobic feeding strategies and three kinds of substrates.R1 achieved faster granulation with a fast influent fill step followed by a modified anaerobic mixed-flow phase,but the AGS showed poorer stability with a cracked structure and a high suspended solids concentration in the *** anaerobic plug-flow feeding mode(with influent fed slowly from the bottom)in R2 provided deeper penetration depth for the substance to reach the core of A G S and accordingly strengthen A G S *** acidogenic upflow sludge bed reactor was introduced as a pretreatment to improve the AGS performance by enhancing glucose pre-fermentation(R4).AGS fed with mixed volatile fatty acids(VFA)after glucose fermentation showed similar performance compared with the reactor fed with acetate in the aspects of stability,structure,size distribution and nitrogen removal efficiency,and 74%similarity in the microbial *** actual wastewater with low VFA concentrations,fermentation treatment was suggested as a promising pretreatment for stable AGS granulation and operation.

关键词： Anaerobic plug-flow feeding mode Anaerobic mixed-flow mode Fermentation pretreatment Substrate gradient Penetration depth

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Potential Stimulation of Nitrifying Bacteria by Landfill Leachate

SSRN

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SSRN 2023年

作者： Li, Siqi Yang, Shaolin Xue, Yu Sahidul, M.D. Islam Liu, Yanchen Huang, Xia State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

With the increasing complexity of influent composition in wastewater treatment plants, the potential stimulating effects of refractory organic matter in wastewater on growth characteristics and species shift of nitrifying bacteria need to be further investigated. In this study, municipal wastewater was co-treated with landfill leachate in the lab-scale reactor, and the competition and co-existence of Ca. Nitrotoga and Nitrospira were observed. The results demonstrated that the addition of landfill leachate can significantly promote the growth of Ca. Nitrotoga, whereas Ca. Nitrotoga populations remain less competitive in domestic wastewater operation. In addition, we found that the refractory organic matter in the landfill leachate had a potential stimulating effect on the maximum specific growth rate of Nitrosomonas (μmax, aob). The μmax, aob of Nitrosomonas in the control group was estimated to be 0.49 d-1 by fitting the ASM model, and the μmax, aob reached 0.66-0.71 d-1 after injection of refractory organic matter in the landfill leachate, while the maximum specific growth rate of NOB (μmax, nob) was always in the range of 1.05-1.13 d-1. These findings have positive significance for the understanding of potential stimuli in nitrification processes and the stable operation of innovative wastewater treatment process. © 2023, The Authors. All rights reserved.

关键词： Biogeochemistry

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Examining the Construction of China's Zero Waste Cities

SSRN

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SSRN 2023年

作者： Li, Yushuang Li, Jinhui State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

In the nationwide effort to address environmental issues caused by solid waste, more than 100 cities in China have been included in the list of national Zero Waste City (ZWC) construction projects. However, the absence of a standardized evaluation method hinders quantitative comparisons among these cities. To overcome this challenge, a comprehensive five-dimension evaluation method was developed, taking into account both the national indicators and city-specific construction indicator systems. After the construction indicator system was transformed to an evaluation one, data processing and weight assignment methods were applied to obtain evaluation results for each dimension using linear weighted synthesis. Subsequently, By combining the results from individual dimensions, an overall evaluation score was derived. Meanwhile, utilizing obstacle analysis models and weighted scores, critical areas requiring attention in ZWC construction could be identified. Empirical research was conducted on Shenzhen following this evaluation framework. The results revealed several key findings: 1) The quantitative score of ZWC performance in Shenzhen increased significantly from 58.9 to 108.3 after the implementation of the pilot project. 2) The dimensions of Management Measure, Support Capacity, and City Characteristic had achieved or approached full scores, indicating commendable progress. However, the Management Level dimension still had room for improvement. 3) While industrial waste management reached an excellent level and agricultural waste proved manageable, challenges persisted in domestic waste landfill and construction waste disposal. These aspects are considered weak points that may require longer-term efforts to address due to inherent objective conditions. © 2023, The Authors. All rights reserved.

关键词： Data handling

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An Interval Fractional Electric Power System Planning Model for CO2 Emission Intensity Reduction: A Case Study of Fujian, China 14th

An Interval Fractional Electric Power System Planning Model ...

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14th International Conference on environmental Science and Technology, ICEST 2023

作者： Zhao, S.H. Li, J.W. Liu, J. Li, Y.P. Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety School of Environmental Science and Engineering Xiamen University of Technology Xiamen361024 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China

ISBN: (纸本)9783031546839

Using low-carbon/zero-carbon energy sources and negative emission technologies, and economic policies have proven to be effective measures for electric power plants’ CO2 emission mitigation. This study constructs an interval fractional electric power system planning (IFES) model for minimizing CO2 emission intensity considering the interactions between the measures and other constraints under uncertainty. The model is applied to Fujian Province as a real-case study, which contains electricity mix improvement, three types of CO2 emission reduction technologies, one policy. It was found that: (i) System carbon emission intensity is [170, 213] g/RMB;(ii) The proportion of clean energy power generation in Fujian Province will reach [92.32, 93.13]% in the 2055–2060, with nuclear energy, wind power and photovoltaic power generation ranking the top three;(iii) The electricity mix improvement has made the greatest contribution to the carbon neutrality of the power system (74.62%), and the contributions of CCS, DAC, and ESC are (9.11, 5.25, 11.02%) respectively. The research results provide scientific planning solutions for carbon reduction in the power industry in Fujian Province. The developed IF-ESP model can also be used in other regions around the world. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Electric power system planning

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Photodegradation of soluble microbial products(SMPs) from membrane bioreactor by GO-COOH/TiO2/Ag

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Journal of environmental Sciences 2020年第2期32卷 292-300页

作者： Shuyan Yu Xia Huang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

This study aimed to explore a new degradation method-photocatalysis technology to polish membrane bioreactor(MBR) effluent, using 2,6-di-tert-butylphenol(2,6-DTBP) as a model soluble microbial product(SMP).2,6-DTBP is one of the predominant SMPs in MBR effluent, which is refractory and difficult to *** study developed a novel carboxylated graphene oxide/titanium dioxide/silver(GO-COOH/TiO2/Ag) nanocomposite to photodegrade 2,***-COOH/TiO2/Ag was successfully synthesized, using L-cysteine as the linker bonding TiO2/Ag to *** structural, morphological and optical properties of the GO-COOH/TiO2/Ag nanocomposite were characterized using various *** to synergistic effects, the GO-COOH/TiO2/Ag nanocomposite exhibited enhanced photocatalytic degradation performance under solar light irradiation when compared to TiO2, Ag and *** remove 25 mg/L 2,6-DTBP, the reaction time for GOCOOH/TiO2/Ag was only 30 min, faster than the 90 min required for pure TiO2 or *** addition, the 200 mg/L GO-COOH/TiO2/Ag nanocomposite aqueous solution showed the best performance under solar light, with 99% removal of 2,*** enhanced capability is likely due to the surface plasmon resonance(SPR) effect contributed by Ag nanoparticles(NPs) doped onto the *** addition, GO-COOH had a high effective surface area, which assisted in degrading the 2,6-DTBP through improved *** stability study showed that the photocatalytic activity of the GO-COOH/TiO2/Ag was stable enough for recycling multiple *** effective degradation performance and excellent stability demonstrates that the GO-COOH/TiO2/Ag nanocomposite can be a promising photocatalyst in the field of effluent SMP photodegradation, which solves the problem of the difficult biodegradation of highly toxic 2,6-DTBP.

关键词： Soluble microbial products (SMPs) 2,6-Di-tert-butylphenol (2,6-DTBP) Carboxylated graphene oxide/titanium dioxide/silver (GO-COOH/TiO2/Ag) nanocomposite Photocatalysis technology

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Cost-Effective Mapping of Hyperlocal Air pollution Using Large-Scale Mobile Monitoring and Land-Use Machine Learning

ACS ES&T Air

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ACS ES&T Air 2025年第2期2卷 151-161页

作者： Tie Zheng Yifan Wen Sheng Xiang Pan Yang Xuan Zheng Yan You Shaojun Zhang Ye Wu School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China；College of Environmental Science and Engineering Tongji University Shanghai 200092 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen 518060 China Macao Environmental Research Institute Macau University of Science and Technology Macau 999078 China；National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research Institute Macau University of Science and Technology Macao 999078 China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 China；State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China；Beijing Laboratory of Environmental Frontier Technologies Beijing 100084 China

The advent of large-scale mobile monitoring using fast-response instruments has enabled hyperlocal mapping (≤100 m) of traffic-related air pollution (TRAP), with important implications for air quality management. However, most related studies have been confined within small areas due to the high cost and labor intensity. This study pioneers a cost-effective TRAP mapping method by incorporating large-scale mobile monitoring and land-use machine learning (LUML). Here, over 4.6 million 1 Hz high-frequency measurements (∼1300 h) were collected on a part of major roadways in the Chinese megacity of Shenzhen. Unmeasured locations were estimated by LUML models to reduce measurement costs and labor intensity. Various ML algorithms and varying spatial aggregation segment lengths were incorporated to optimize the model performance. Hyperlocal maps of NO, NO2, and PM2.5were predicted across the entire road network covering over 1700 km2. Based on our results, LU-RF (random forest) for mapping NO and NO2and LU-GBM (Gradient Boosting Machine) for mapping PM2.5, demonstrated superior performance. Deep learning models, in contrast, did not yield comparable results. Finer partitioning of road segments (≤100 m) improved NO prediction performance, but worsened that for NO2and PM2.5. By deployment of optimal ML algorithms and segment lengths, the TRAP mapping accuracy increased by 20–80% compared to conventional land-use regression models. This study provides a promising and cost-effective approach to hyperlocal air pollution mapping and management in cities worldwide.

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Transformation of dissolved organic matter during groundwater arsenite removal using air cathode iron electrocoagulation

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Chemosphere 2024年 358卷 142083页

作者： Yuan, Ying Chen, Jiabao Zhang, Hao Wu, Yue Xiao, Yu Huang, Wan Wang, Yang Tang, Jun Zhang, Fang State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing100084 China College of Environmental Science and Engineering Guilin University of Technology Guilin541004 China

Dissolve organic matters (DOM) usually showed negative effect on the removal of inorganic arsenic (As) in groundwater by electrochemical approaches, yet which parts of sub-component within DOM played the role was lack of evidence. Herein, we investigated the effects of land-source humic-like acid (HA) on groundwater As(III) removal using air cathode iron electrocoagulation, based on the parallel factor analysis of three-dimensional excitation–emission matrix and statistical methods. Our results showed that the land-source HA contained five kinds of components and all components presented significantly negative correlations with the removal of both As(III) and As(V). However, the high aromatic fulvic-like acid and low aromatic humic-like acid components of land-source HA presented the opposite correlations with the concentration of As(III) during the reaction. The high aromaticity fulvic-like components of land-source HA (Sigma-Aldrich HA, SAHA) produced during the reaction facilitated the oxidation of As(III) due to its high electron transfer capacities and good solubility in wide pH range, but the low aromaticity humic-like ones worked against the oxidation of As(III). Our findings offered the novel insights for the flexible activities of DOM in electron Fenton system. © 2024 Elsevier Ltd

关键词： Groundwater

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Review on heterogeneous oxidation and adsorption for arsenic removal from drinking water

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Journal of environmental Sciences 2021年第12期33卷 178-188页

作者： Ruiping Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

The long term exposure of arsenic via drinking water has resulted in wide occurrence of arsenisim globally, and the oxidation of the non-ionic arsenite(As(Ⅲ)) to negatively-charged arsenate(As(Ⅴ)) is of crucial importance for the promising removal of arsenic. The chemical oxidants of ozone, chlorine, chlorine dioxide, and potassium permanganate may achieve this goal;however, their application in developing countries is sometimes restricted by the complicate operation and high cost. This review paper focuses on the heterogeneous oxidation of As(Ⅲ) by solid oxidants such as manganese oxide, and the adsorption of As(Ⅴ)accordingly. Manganese oxide may be prepared by both chemical and biological methods to achieve good oxidation performance towards As(Ⅲ). Additionally, manganese oxide may be combined with other metal oxides, e.g., iron oxide, to improve the adsorption capability towards As(Ⅴ). Furthermore, manganese oxide may be coated onto porous materials of metal organic frameworks to develop novel adsorbents for arsenic removal. To achieve the application in engineering works, the adsorbents granulation may be achieved by drying and calcination, agglomeration, and the active components may also be in situ coated onto the porous materials to maintain the oxidation and adsorption activities as much as possible. The novel adsorbents with heterogeneous oxidation and adsorption capability may be carefully designed for the removal of arsenic in household purifiers, community-level decentralized small systems, and the large-scale drinking water treatment plants(DWTPs).This review provides insight into the fundamental studies on novel adsorbents, the development of innovative technologies, and the demonstration engineering works involved in the heterogeneous oxidation and adsorption, and may be practically valuable for the arsenic pollution control globally.

关键词： Arsenic Heterogeneous oxidation Adsorption Manganese oxide Drinking water

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