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Sulfide elimination by intermittent nitrate dosing in sewer sediments

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Journal of environmental Sciences 2015年第1期27卷 259-265页

作者： Yanchen Liu Chen Wu Xiaohong Zhou David Z.Zhu Hanchang Shi School of environment Tsinghua University department of Civil and environmental Engineering University of Alberta

The formation of hydrogen sulfide in biofilms and sediments in sewer systems can cause severe pipe corrosions and health hazards, and requires expensive programs for its prevention. The aim of this study is to propose a new control strategy and the optimal condition for sulfide elimination by intermittent nitrate dosing in sewer sediments. The study was carried out based on lab-scale experiments and batch tests using real sewer sediments. The intermittent nitrate dosing mode and the optimal control condition were investigated. The results indicated that the sulfide-intermittent-elimination strategy by nitrate dosing is advantageous for controlling sulfide accumulation in sewer sediment. The oxidation–reduction potential is a sensitive indicator parameter that can reflect the control effect and the minimum N/S（nitrate/sulfide）ratio with slight excess nitrate is necessary for optimal conditions of efficient sulfide control with lower carbon source loss. The optimal control condition is feasible for the sulfide elimination in sewer systems.

关键词： Sewer system Sulfide elimination Sediment Optimal condition Intermittent nitrate dosing

Simulation and optimization approach for uncertainty-based short-term planning in open pit mines

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International Journal of Mining Science and Technology 2018年第2期28卷 153-166页

作者： Shiv Prakash Upadhyay Hooman Askari-Nasab department of Civil and environment Engineering School of Mining and Petroleum Engineering University of Alberta

Accuracy in predictions leads to better planning with a minimum of opportunity lost. In open pit mining,the complexity of operations, coupled with a highly uncertain and dynamic production environment,limit the accuracy of predictions and force a reactive planning approach to mitigate deviations from original plans. A simulation optimization framework/tool is presented in this paper to account for uncertainties in mining operations for robust short-term production planning and proactive decision making. This framework/tool uses a discrete event simulation model of mine operations, which interacts with a goalprogramming based mine operational optimization tool to develop an uncertainty based short-term schedule. Using scenario analysis, this framework allows the planner to make proactive decisions to achieve the mine's operational and long-term objectives. This paper details the development of simulation and optimization models and presents the implementation of the framework on an iron ore mine case study for verification through scenario analysis.

关键词： Scheduling Simulation optimization Short-term planning Mine operational planning Truck-shovel allocation

Heavy metals in sediments and their bioaccumulation in Phragmites australis in the Anzali wetland of Iran

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Chinese Journal of Oceanology and Limnology 2016年第4期34卷 810-820页

作者： Marjan ESMAEILZADEH Abdolreza KARBASSI Faramarz MOATTAR department of environmental Science Faculty of Environment and Energy Tehran Science and Research Branch Islamic Azad University department of environmental Engineering Graduate Faculty of Environment University of Tehran

Accumulation of metals in both sediments and Phragmites australis organs was studied. Samples were collected from seven stations located in Anzali wetland, Iran. The samples were analyzed by inductively coupled plasma mass spectrometry(ICP-MS). The results showed that concentration of the studied metals(except As and Cd) were higher in sediments than in *** organs. Metal accumulation was found to be signifi cantly(P <0.05) higher in roots than in above-ground organs of ***. The bioaccumulation factor(BAF) and the transfer factor(TF) also verifi ed the highest rate of metal accumulation in roots and their reduced mobility from roots to the above-ground organs. Pearson correlation coeffi cient showed signifi cant relationships between metal concentrations in sediments and those in plant organs. It should be pointed out that sediment and plant samples exhibited higher metal concentrations in eastern and central parts than in western and southern parts of the wetland. The mean concentrations of all studied elements(except for Fe, V and Al) were higher in these sediment samples than in the Earth's crust and shale. High accumulation of metals in P. australis organs(roots and shoots) is indicative of their high bioavailability in sediments of the wetland. The correlation between metal concentrations in sediments and in P. australis indicates that plant organs are good bioindicators of metal pollution in sediments of Anzali wetland.

关键词： transfer factor bioaccumulation factor aquatic plant phytotoxic level trace elements

Factors affecting electric vehicle acceptance,energy demand and CO_(2)emissions in Pakistan

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Green Energy and Intelligent Transportation 2023年第3期2卷 3-15页

作者： Muhammad Huzaifa Butt Jai Govind Singh department of Energy Environment and Climate ChangeSchool of Environment and Resources DevelopmentAsian Institute of TechnologyThailand

This work aims to investigate the factors accelerating electric vehicle(EV)acceptance at the consumer end in Pakistan and analyzes the implications for policymakers for a fast-track EV *** study further in-vestigates the high EV penetration scenario resulting from the technology acceptance model(TAM's 80%EV)and its impact on energy demand and CO_(2)*** study design used a quantitative analysis method with the survey as an instrument for data collection regarding EV *** model under investigation was adapted from the famous Technology-Acceptance Models(TAMs)and modified with other significant predictors evidenced in the *** and stepwise regression were performed with a multicollinearity check for model hypothesis *** of six predictors,only four factors were significant in accelerating the EV *** policies were found to be highly significant,followed by environmental concern,facilitating conditions and perceived ease of *** research then used exponential smoothing forecasts for transport demand and developed an EV penetration scenario based on modified TAM *** results highlight the significant in-crease in transport demand and the opportunity for Pakistan to limit passenger transport emissions to 36.6 MT instead of 61.6 MT by 2040.

关键词： Pakistan electric vehicle adoption Technology acceptance model Electric vehicle adoption Public acceptance Pakistan transport energy demand Pakistan transport emissions

Relating Cd2+binding by humic acids to molecular weight:A modeling and spectroscopic study

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Journal of environmental Sciences 2018年第8期30卷 154-165页

作者： Hongcheng Bai Zhenmao Jiang Minjin He Biying Ye Shiqiang Wei College of Resources and environment Department of Environment Science and EngineeringSouthwest UniversityChongqing 400715China Chongqing Key Laboratory of Agricultural Resources and environment Chongqing 400715China China Key Laboratory of the Three Gorges Reservoir Region's Eco-environment Ministry of EducationChongqing 400715China

Molecular weight（Mw） is a fundamental property of humic acids（HAs）, which considerably affect the mobility and speciation of heavy metals in the environment. In this study, soil humic acid（HA） extracted from Jinyun Mountain, Chongqing was ultra-filtered into four fractions according to the molecular weight, and their properties were *** of cadmium was investigated by titration experiments. For the first time,Langmuir and non-ideal competitive adsorption-Donna（NICA-Donnan） models combined with fluorescence excitation-emission matrix（EEM） quenching were employed to elucidate the binding characteristics of individual Mw fractions of HA. The results showed that the concentration of acidic functional groups decreased with increasing Mw, especially the phenolic groups. The humification degree and aliphaticity increased with increasing Mw as indicated by elemental composition analysis and FT-IR spectra. The binding capacity of Cd2＋ to Mw fractions of HA followed the order UF1（〈 5 kDa）〉 UF2（5–10 kDa）〉 UF4（〉 30 kDa）〉 UF3（10–30 kDa）. Moreover, the distribution of cadmium speciation indicated that the phenolic groups were responsible for the variations in binding of Cd2＋ among different Mw fractions. The results of fluorescence quenching illustrated that the binding capacity of Cd2＋ to Mw fractions was controlled by the content of functional groups, while the binding affinity was largely influenced by structural factors. The results provide a better understanding of the roles that different HA Mw fractions play in heavy metal binding,which has important implications in the control of heavy metal migration and bio-toxicity.

关键词： Humic acid Molecular weight NICA-Donnan Fluorescence excitation-emission matrix quenching Cadmium

Assessment of metal pollution in the Anzali Wetland sediments using chemical partitioning method and pollution indices

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Acta Oceanologica Sinica 2016年第10期35卷 28-36页

作者： ESMAEILZADEH Marjan KARBASSI Abdolreza MOATTAR Faramarz department of environmental Science Faculty of Environment and Energy Tehran Science and Research BranchIslamic Azad University department of environmental Engineering Graduate Faculty of Environment University of Tehran

Metal pollution in aquatic ecosystems is of immense importance. Under various environment circumstances, the metal contents of sediments can enter into the overlying water body leading to severe toxicity. This study aims to determine metal concentrations in sediments of Anzali International Wetland in Iran. Chemical partitioning method is used to determine the portion of anthropogenic pollution and the mobility potential of each metal. The intensity of metal pollution in sediments of the wetland is assessed using three reliable indices. The results of chemical partitioning reveal that cadmium bear the highest risk of being released into the aquatic environment and high amount of manganese in sulfide bond phase implies the initiation of redox state in aquatic environment of the Anzali Wetland. The results of chemical partitioning studies show that Pb, Cd, Mn and As have the highest anthropogenic portion. Cluster analysis also confirms the results of chemical partitioning and indicates that the mentioned metals can be originated from anthropogenic sources. Sediment pollution indices, including, Igeo,IPOLL, and m-ERM-Q reveal that metals are in the range of low to moderate pollution and also show that the highest metal pollution is in the eastern and central parts of the wetland. This can be ascribed to rivers which are the recipient of industrial, agricultural and municipal wastewaters and flow into these parts of the wetland.

关键词： pollution environment sediment metal geochemistry

InSAR-derived surface deformation characteristics and mining subsidence parameters in mountain coal mines

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Journal of Mountain Science 2024年第9期21卷 3139-3156页

作者： JIANG Xiaowei SHI Wenbing LIANG Feng GUI Jingjing LI Jiawei Key Laboratory of Karst georesources and environment Ministry of EducationGuizhou UniversityGuiyang 550025China College of Resources and environmental Engineering Guizhou UniversityGuiyang 550025China Mountain Geohazard Prevention R&D Center of Guizhou Province Guiyang 550025China

Mining-induced surface deformation disrupts ecological balance and impedes economic *** study employs SBAS-InSAR with 107-view of ascending and descending SAR data from Sentinel-1,spanning February 2017 to September 2020,to monitor surface deformation in the Fa’er Coal Mine,Guizhou *** on the surface deformation time series reveals the relationship between underground mining and surface *** geological conditions,mining activities,duration,and ranges,the study determines surface movement parameters for the coal *** asserts that mining depth significantly influences surface movement parameters in mountainous mining *** mining depth elevates the strike movement angle on the deeper side of the burial depth by 22.84°,while decreasing by 7.74°on the shallower *** movement angles decrease by 4.06°,while downhill movement angles increase by 15.71°.This emphasizes the technology's suitability for local mining design,which lays the groundwork for resource development,disaster prevention,and ecological protection in analogous contexts.

关键词： Time-series InSAR Surface deformation Subsurface mining Mining subsidence

Reliability Enhanced Multi-objective Economic Dispatch Strategy for Hybrid Renewable Energy System with Storage

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Journal of the Operations Research Society of China 2023年第1期11卷 51-81页

作者： Anongpun Man-Im Weerakorn Ongsakul Nimal Madhu department of Energy Environment and Climate ChangeSchool of EnvironmentResources and DevelopmentAsian Institute of TechnologyKlong LuangPathumthani12120Thailand

An optimal dispatch strategy for the economic operation of hybrid renewable energy system with storage is presented in this paper. Solar photovoltaic (PV), Wind and Battery Storage are the prime components of interest constituting the hybrid system. In addition to the economic aspect of the systems, the formulation focuses on renewable prioritized operation, system reliability and environmental sustainability enhancement. Being a multi-objective (MO) problem, a modified non-dominated sorting particle swarm optimization is used for solving the problem, considering operational cost, pollutant emission, and expected energy not served as operational objectives. The non-dominated sorting particle swarm optimization (NSPSO) is augmented with crowding distance technique, stochastic weight trade-off and chaotic mutation approaches, to control the exploration of global and particle bests, alleviating premature convergence, and enhancing solution search capability. A two-stage approach is used to derive the best solution. A modified IEEE 30-bus test system is used to demonstrate the results. By using the proposed approach, a lower and wider Pareto front is obtained, in comparison with prominent optimization approaches.

关键词： Multi-objective economic dispatch Emission reduction Particle swarm optimization Hybrid energy system Expected energy not served Battery energy storage

Optimized synthesis and photovoltaic performance of TiO_2 nanoparticles for dye-sensitized solar cell

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Particuology 2013年第6期11卷 753-759页

作者： Siti Nur Fadhilah Zainudin Masturah Markom Huda Abdullah Renata Adami Siti Masrinda Tasirin department of Chemical Engineering and Process Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia department of Electrical Electronic and System EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia department of Chemical and Food Engineering University of Salerno

This paper presents response surface methodology （RSM） as an efficient approach for modeling and optimizing TiO2 nanoparticles preparation via co-precipitation for dye-sensitized solar cell （DSSC） perfor- mance. Titanium （IV） bis-（acetylacetonate） di-isopropoxide （DIPBAT）, isopropanol and water were used as precursor, solvent and co-solvent, respectively. Molar ratio of water, aging temperature and calcina- tion temperature as preparation factors with main and interaction effects on particle characteristics and performances were investigated, Particle characteristics in terms of primary and secondary sizes, crys- tal orientation and morphology were determined by X-ray diffractometry （XRD） and scanning electron microscopy （SEM）. Band gap energy and power conversion efficiency of DSSCs were used for perfor- mance studies. According to analysis of variance （ANOVA） in response surface methodology （RSM）, all three independent parameters were statistically significant and the final model was accurate. The model predicted maximum power conversion efficiency （0.14%） under the optimal condition of molar ratio of DIPBAT-to-isopropanol-to-water of 1 ： 10：500, aging temperature of 36 C and calcination temperature of 400 ℃. A second set of data was adopted to validate the model at optimal conditions and was found to be 0.14 ± 0.015%, which was very close to the predicted value. This study proves the reliability of the model in identi（ving the optimal condition for maximum performance.

关键词： Titanium dioxide Hydrolysis precipitation Dye-sensitized solar cell Optimization Response surface methodology