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Improvement and optimization for the first order decay model parameters at typical municipal solid waste landfills in China

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气候变化研究进展:英文版 2023年第4期14卷 605-614页

作者： Xiao-Xia NIU Shu-Zhuan WANG Yu-Chao NIU Li-Fang WEI Lu-Yao YU Department of Environmental Engineering School of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China Zhengzhou City Administration Bureau Zhengzhou 450006China

Landfill gas(LFG)generation is commonly modeled by using a first-order *** generation potential(L0)and methane generation rate constant(k)are two key parameters in the first-order ***-ash based default values or roughly analyzed values often used in China may not be appropriate for accurately estimating of LFG *** this study,seven groups of parameters were evaluated by comparing the theoretical predictions with real measurements from five Chinese *** optimal approach for calculating L0 is the use of site-specific waste composition and the default values of degradable organic carbon(DOC)reported by the Chinese industry standard(CJJ133-2009),and the matching k can be adjusted by fitting and *** optimized average values were L0=67 m3 Mg−1,k=0.06 per year for landfills in Beijing and Zhengzhou in cold–dry regions,L0=69 m3 Mg−1,k=0.16 per year for landfill in Shanghai in cold–wet region,and L0=64 m3 Mg−1,k=0.21 per year for landfills in Guangzhou and Shenzhen in hot–wet *** Carlo analysis showed that the uncertainty of LFG generation at closure year varied in−22.5%to 20.5%,−17.1%to 17.1%and−28.2%to 34.7%for three climatic regions,*** k value is the key influencing factor,with a 95.6%contribution ratio in the hot–wet region *** results provide references for future better waste management.

关键词： Municipal solid waste waste-to-energy waste management Gas generation model

Breakthrough Technologies for the Biorefining of Organic solid and Liquid wastes

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Engineering 2018年第4期4卷 574-580页

作者： Paul Chen Erik Anderson Min Addy Renchuan Zhang Yanling Cheng Peng Peng Yiwei Ma Liangliang Fan Yaning Zhang Qian Lu Shiyu Liu Nan Zhou Xiangyuan Deng Wenguang Zhou Muhammad Omar Richard Griffith Faryal Kabir Hanwu Lei Yunpu Wang Yuhuan Liu Roger Ruan center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota St. Paul MN 55108 USA MOE Biomass Engineering Research center Nanchang University Nanchang 330047 China

Organic solid and liquid wastes contain large amounts of energy, nutrients, and water, and should not be perceived as merely waste. Recycling, composting, and combustion of non-recyclables have been practiced for decades to capture the energy and values from municipal solid wastes. Treatment and disposal have been the primary management strategy for wastewater. As new technologies are emerging, alternative options for the utilization of both solid wastes and wastewater have become available. Considering the complexity of the chemical, physical, and biological properties of these wastes, multiple technologies may be required to maximize the energy and value recovery from the wastes. For this purpose, biorefin- ing tends to be an appropriate approach to completely utilize the energy and value available in wastes. Research has demonstrated that non-recyclable waste materials and bio-solids can be converted into usable heat, electricity, fuel, and chemicals through a variety of processes, and the liquid waste streams have the potential to support crop and algae growth and provide other energy recovery and food production options. In this paper, we propose new biorefining schemes aimed at organic solid and liquid wastes from municipal sources, food and biological processing plants, and animal production facilities. Four new breakthrough technologies-namely, vacuum-assisted thermophilic anaerobic digestion, extended aquaponics, oily wastes to biodiesel via glycerolysis, and microwave-assisted thermochemical conversion-can be incorporated into the biorefining schemes, thereby enabling the complete utilization of those wastes for the production of chemicals, fertilizer, energy （biogas, syngas, biodiesel, and bio-oil）, foods, and feeds, and resulting in clean water and a significant reduction in pollutant emissions.

关键词： Municipal solid waste Municipal wastewater Pyrolysis Gasification Anaerobic digestion Microalgae Biodiesel Biorefining

Strategies for high-performance perovskite solar cells from materials, film engineering to carrier dynamics and photon management

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InfoMat 2022年第7期4卷 1-69页

作者： Huilin Li Chong Chen Hangyu Hu Yu Li Zhitao Shen Fumin Li Ying Liu Rong Liu Junwei Chen Chao Dong Sally Mabrouk Raja Sekhar Bobba Abiral Baniya Mingtai Wang Quinn Qiao Henan Key Laboratory of Photovoltaic Materials Henan UniversityKaifengP.R.China Institute of solid State Physics Chinese Academy of SciencesHefeiP.R.China Department of Mechanical and Aerospace Engineering Syracuse UniversitySyracuseNew YorkUSA

In recent years,halide perovskite solar cells(HPSCs)have attracted a great atten-tion due to their superior photoelectric performance and the low-cost of processing their quality *** order to commercialize HPSCs,the researchers are focusing on developing high-performance *** strategies have been reported to increase the power conversion efficiency and the long-term stability of HPSCs over the past ***,we review the latest efforts and the chemical-physical principles for preparing high-efficiency and long-term stability HPSCs in particu-lar,concentrating on the perovskite materials,technologies for perovskite films,charge transport materials and ferroelectric effect to reduce the carrier loss,and photon management via plasmonic and upconversion ***,the key issues for future researches of HPSCs are also discussed with regard to the require-ments in practical application.

关键词： charge-carrier dynamic defect passivation perovskite solar cells photon management stability

Thermal behaviors, combustion mechanisms,evolved gasses, and ash analysis of spent potlining for a hazardous waste management

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Journal of Environmental Sciences 2021年第9期33卷 124-137页

作者： Guang Sun Gang Zhang Jingyong Liu Deniz Eren Evrendilek Musa Buyukada Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China Engineering Research center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes Dongguan University of TechnologyDongguan 523808China Department of Computing Science Simon Fraser UniversityBritish Columbia V5ACanada Department of chemical Engineering Bolu Abant Izzet Baysal UniversityBolu 14052Turkey

An unavoidable but reusable waste so as to enhance a more circular waste utilization has been spent potlining(SPL) generated by the aluminum *** combustion mechanisms, evolved gasses, and ash properties of SPL were characterized dynamically in response to the elevated temperature and heating *** scanning calorimetric(DSC) results indicated an exothermic reaction behavior probably able to meet the energy needs of various industrial *** reaction mechanisms for the SPL combustion were best described using the 1.5-, 3-and 2.5-order reaction *** volatilization rate of the flue gas was estimated at 2.24%.The SPL combustion emitted CO_(2), HNCO, NO, and NO_(2) but SO_(x).The joint optimization of remaining mass, derivative thermogravimetry, and derivative DSC was achieved with the optimal temperature and heating rate combination of 783.5 ℃, and 5 ℃/min, *** between temperature and heating rate exerted the strongest and weakest impact on DSC and remaining mass, *** fluorine mainly as the formation of substantial NaF and CaF_(2) in the residual ***,the composition and effect of environment of residual solid were *** ash slagging tendency and its mineral deposition mechanisms were elucidated in terms of turning SPL waste into a benign input to a circular waste utilization.

关键词： Spent potlining Thermal decomposition Heat release Reaction mechanism Gas emission

Power-to-chemicals:sustainable liquefaction of food waste with plasma-electrolysis

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Frontiers of chemical Science and Engineering 2023年第5期17卷 594-605页

作者： Wenquan Xie Xianhui Zhang Dengke Xi Rusen Zhou Size Yang Patrick Cullen Renwu Zhou Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Fujian Engineering Research Center for EDAFujian Provincial Key Laboratory of Electromagnetic Wave Science and Detection TechnologyXiamen Key Laboratory of Multiphysics Electronic InformationInstitute of Electromagnetics and AcousticsXiamen UniversityXiamen 361005China School of chemical and Biomolecular Engineering University of SydneySydney NSW 2006Australia State Key Laboratory of Electrical Insulation and Power Equipment Centre for Plasma BiomedicineXi’an Jiaotong UniversityXi’an 710049China

The increasing amount of food waste from various industrial,agricultural,and household sources is an environmental burden if managed *** waste management approaches have been developed for the disposal of food waste,but still suffer from either high cost,production of toxic by-products,or secondary environmental ***,we report a new and sustainable plasma electrolysis biorefinery route for the rapid and efficient liquefaction of food *** the plasma electrolysis process,only the solvent is added to liquefy the waste,and anions in the waste can contribute to catalyzing the biowaste *** liquefying the waste,the highly reactive species produced in the plasma electrolysis process can efficiently reduce the content of O,N,and Cl in the liquefied products and oxidize most of the metals into solid ***,the removal rate of Na and K elements was greater than 81%,which is significantly higher than using the traditional oil bath liquefaction,resulting in a relatively high-quality biocrude oil with a high heating value of 25.86 MJ·kg^(-1).Overall,this proposed strategy may provide a new sustainable and eco-friendly avenue for the power-to-chemicals valorization of food waste under benign conditions.

关键词： plasma electrolysis food waste liquefaction resource recovery

ASSESSMENT OF HEAVY METALS IN HYDROCHAR PRODUCED BY HYDROTHERMAL CARBONIZATION OF DAIRY MANURE

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Frontiers of Agricultural Science and Engineering 2023年第3期10卷 437-447页

作者： B.Brian HE Zheting BI Lide CHEN chemical&Biological Engineering College of EngineeringUniversity of Idaho875 Perimeter Drive MS 0904MoscowID 83844USA. Shape Therapeutics 700 Dexter Avenue NorthSL15SeattleWA 98109USA Soil and Water Systems Twin Falls Research and Extension CenterUniversity of Idaho315 Falls Ave.Twin FallsID 83303USA

Hydrochar produced from dairy manure is a regulated biosolid if being promoted for agricultural applications thus must have the properties that comply with all environmental standards and government regulations,including the levels of heavy metals(HMs).In this study,systematic research was conducted on HM levels in hydrochar from dairy manure and on the effects of processing conditions,including processing temperature(180–255℃),holding time(30–120 min)and solid content of manure slurry(2%–15%),through a central composite design and statistical *** was found that HMs can be retained in hydrochar,ranging from 40%to 100%.The processing temperature and solid content in the feed were the most influential process parameters that affected HMs retention in *** analysis showed that there was no single optimal point to minimize HMs retained in hydrochar,but there were minimization points at given processing time and solid *** HMs concentrations were higher in hydrochar than those initially in dairy manure but were greatly below the thresholds as set by the US government ***,hydrochar is feasible for use as a phosphorus-enriched organic fertilizer and/or soil amendment for agricultural applications without serious concerns about HMs it might contain.

关键词： heavy metals dairy manure hydrochar hydrothermal carbonization waste management

Physico-chemical and Oxygen-Hydrogen Isotopic Assessment of Bagmati and Bishnumati Rivers and the Shallow Groundwater along the River Corridors in Kathmandu Valley, Nepal

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Journal of Water Resource and Protection 2015年第17期7卷 1435-1448页

作者： Rabin Malla Sarita Shrestha Saroj K. Chapagain Maneesha Shakya Takashi Nakamura center of Research for Environment Energy and Water (CREEW) Kathmandu Nepal Environmental Engineering and management Asian Institute of Technology Klong Luang Thailand Interdisciplinary Centre for River Basin Environment (ICRE) University of Yamanashi Kofu Japan

The direct dumping of solid wastes into the rivers, discharge of industrial effluents together with direct discharge of domestic sewage have excessively polluted the major rivers Bagmati and Bish-numati. Groundwater along these river corridors is also affected from pollution of these rivers. Two major rivers: Bagmati and Bishnumati and shallow tube wells adjacent to these rivers were monitored for 2 years. Samples were analysed for the stable isotopes of hydrogen and oxygen (δD and δ18O) and selected physico-chemical parameters to investigate the possible interrelationship between river water and shallow groundwater along these river corridors. The physico-chemical values revealed that shallow groundwater and river water along the Bishnumati River corridor were heavily mineralized due to direct discharge of sewage wastes into this river. The isotope compositions of river water and shallow groundwater clustered together revealed possible interrelationship between them. Some of the isotopic compositions of groundwater and river water deviated below the Local Meteoric Water Line (LMWL) indicating that the water has undergone evaporation. The isotopic and chemical results suggested possible interrelationship between river water and groundwater. Fractional contribution of the river water to groundwater was calculated based on isotopic data using mass balance approach. Results showed that shallow groundwater SG1, along the Bagmati River corridor (in September 2013), was composed of approximately 30% - 40% Bagmati River water. Similarly, shallow groundwater SG5 of Bishnumati River corridor (in September 2013), was composed of approximately 45% - 50% river water. This result indicated that high portion of river water mixed-up with adjoining shallow groundwater along the river corridors. Further, the mix-up of the river water with groundwater can be harmful when rivers are polluted. These findings can be useful for a better understanding of hydrogeological processes at the r

关键词： Bagmati River Bishnumati River Groundwater Interrelationship Kathmandu Valley Stable Isotopes

Appropriate solid waste management system in Quelimane (Mozambique):study and design of a small-scale center for plastic sorting with wastewater treatment

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waste Disposal and Sustainable Energy 2022年第1期4卷 49-62页

作者： Francesca Villa Giovanni Vinti Mentore Vaccari Department of Civil and Environmental Engineering(DICA) Politecnico di MilanoVia Golgi 3920133 MilanItaly Laboratory Centre on Appropriate Technologies for Environmental management in Resource-Limited Countries(CeTAmb LAB) University of BresciaVia BranzeBresciaItaly

Appropriate solid waste management(SWM)strategies are necessary to avoid severe environmental and sanitary impacts,especially in low-income *** strategies are most likely to succeed whether implementing actors are supported by scientific *** this paper,the results of a collaboration between local authorities and researchers are presented and discussed that are the assessment of waste generation in the city of Quelimane(Mozambique),integrating existing and field-collected data and the design of a small-scale center for plastic sorting to complement the SWM system of the *** center is expected to receive about 0.3-0.4 t/day of plastic waste(5%-7%of the overall amount of plastic waste daily produced in Quelimane).As long-term sustainability represents a typical issue,simplicity of operation was a leading principle in the design of the center;moreover,the design included a treatment plant(WWTP)for generated wastewater,whose management is usually neglected in such *** others,natural wastewater treatment(constructed wetlands)has been chosen for its ***,the so-conceived WWTP appears as a novelty in the scientific literature associated with small-scale plastic sorting *** system is designed to treat an average flow of 6 m3/day and consisted of a septic tank followed by a subsurface flow constructed ***,the COD(chemical oxygen demand)and TSS(total suspended solids)removal higher than 80%and 90%were estimated,*** on this work,both the center and the WWTP were successfully realized,which are waiting to become *** the authors’opinion,the implemented procedure could become a reference for broader investigations and surveys.

关键词： Low-income countries wastewater treatment Plastic recycling Informal sector waste collection

Enhancement of in-plane thermal conductivity of flexible boron nitride heat spreaders by micro/nanovoid filling using deformable liquid metal nanoparticles

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Rare Metals 2023年第11期42卷 3662-3672页

作者： Pei-Di Tao Shao-Gang Wang Lu Chen Jun-Feng Ying Le Lv Li-Wen Sun Wu-Bo Chu Kazuhito Nishimura Li Fu Yue-Zhong Wang Jin-Hong Yu Nan Jiang Wen Dai Yao-Kang Lv Cheng-Te Lin Qing-Wei Yan College of chemical Engineering Zhejiang University of TechnologyHangzhou310058China Qianwan Institute Ningbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingbo315201China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingboInstitute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingbo315201China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Advanced Nano-Processing Engineering Lab Mechanical Systems EngineeringKogakuin UniversityTokyo192-0015Japan College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou310018China

With the fast development of integrated circuit devices as well as batteries with high energy densities,the thermal management of electronic components is becoming increasingly crucial to maintaining their reliable *** nitride nanosheets(BNNS),which have superhigh thermal conductivity along the in-plane direction while remaining electrically insulating,were widely regarded as an ideal filler for preparing high-performance polymer composites to address the‘‘thermal failure''***,due to the instinctive rigidity of BNNS,the nanosheets are unable to form a tightly interfacial contact between the adjoining fillers,resulting in some micro-and nanovoids within the heat transfer pathways and severely limiting further thermal conductivity enhancement for BNNS-based ***,soft and deformable liquid metal(eutectic gallium-indium,EGaIn)nanoparticles were employed to fill the gaps between the adjacent BNNS with a rational design of mass ratios of BNNS and EGaIn,leading to a strongly synergistic effect with BNNS on thermal conductivity *** a result,the composite film(BNNS:63 wt%and EGaIn:7 wt%)employing cellulose nanofibers(CNF:30 wt%)as the polymer matrix achieves superhigh thermal conductivity along the in-plane direction of up to(90.51±6.71)W·m^(-1)·K^(-1),showing the highest value among the BNNSbased composites with a bi-filler system as far as we ***,the film can work as a heat spreader for the heat dissipation of high-power light emitting diodes,outperforming tin foil in cooling efficiency.

关键词： Boron nitride nanosheet Liquid metal Eutectic gallium-indium In-plane thermal conductivity Heat spreader