检索结果-内蒙古大学图书馆

INTERACTIONS BETWEEN MICROORGANISMS AND ACTIVATED CARBON IN water AND WASTE TREATMENT OPERATIONS

CHEMICAL engineering COMMUNICATIONS 1991年第1期108卷 113-125页

作者： OLMSTEAD, KP WEBER, WJ Environmental and Water Resources Engineering Program The University of Michigan Ann Arbor MI 48109 United States

The encouragement of microbial activity in activated carbon operations used for water and waste treatment has attracted interest as a potential means for enhancing overall system performance. Microorganisms have been found to have both positive and negative effects on adsorption processes; the most common positive effect is increased throughput before regeneration is required, while common negative effects include potential interference with the adsorption of specifically targeted compounds and the possibility of release of pathogenic organisms to progress effluents. There have been a number of reports in the literature, including several by Dr. Tien and his co-workers, which have involved either experimental or numerical modeling studies of phenomena associated with biologically active carbon adsorption systems. This paper reviews progress to date on elucidation of various mechanisms extant in such systems, and suggests areas for future research on the topic.

关键词： ACTIVATED CARBON MICROORGANISMS ADSORPTION water AND WASTE TREATMENT BIOLOGICALLY-ACTIVE CARBON ADSORPTION

来源：评论

学校读者我要写书评

暂无评论

DEGRADATION OF ORGANIC VAPORS IN UNSATURATED SOILS

引用

JOURNAL OF HAZARDOUS MATERIALS 1991年第1-2期28卷 55-63页

作者： ENGLISH, CW LOEHR, RC Environmental and Water Resources Engineering Program Department of Civil Engineering University of Texas Austin Austin TX 78712 USA

To predict the fate of volatile organic compounds (VOCs) in unsaturated soil, it is necessary to understand the physical and chemical processes that occur in the soil system. Two important removal mechanisms of organic vapors in soil are sorption and biodegradation. Modeling efforts to describe the removal of organic vapors in soil require constitutive relationships that are developed from laboratory data. This paper reports measurements of removal coefficients for three VOCs in a fine sandy loam soil. Sorption coefficients and degradation removal rates were determined from batch reactors for three compounds: benzene, trichloroethylene (TCE) and o-xylene. Results indicate organic vapors are sorbed and then removed by biodegradation in the unsaturated soil system. This information has potential for use in the bioremediation of soils contaminated with VOCs and for impacting decisions on air emissions, regulatory limits and on-site controls.

关键词：

来源：评论

学校读者我要写书评

暂无评论

DETERMINATION OF PARTITION-COEFFICIENTS AND AQUEOUS SOLUBILITIES BY REVERSE PHASE CHROMATOGRAPHY .2. EVALUATION OF PARTITIONING AND SOLUBILITY MODELS

引用

water RESEARCH 1986年第11期20卷 1443-1450页

作者： CHIN, YP WEBER, WJ VOICE, TC Water Resources and Environmental Engineering Program 181 Engineering Building 1-A The University of Michigan Ann Arbor MI 48109 U.S.A.

Part I of this series examined the chemical and thermodynamic principles underlying the solubility and partitioning characteristics of non-electrolyte organic compounds in aqueous systems. It further considered those concepts which interrelate solubility and partitioning phenomena with retentive behavior in reverse phase liquid chromatography. Conceptual and predictive models which intercorrelate solubility, octanol/water partitioning and reverse phase retention times were developed. Part II of the series evaluates the relative predictive abilities of these models for a wide range of different classes of organic pollutants. The results reveal that the reverse phase liquid chromatography models developed in Part I provide good estimates of octanol/water coefficients and aqueous solubilities from experimentally determined chromatographic retention times. Models structured to predict aqueous solubilities from octanal/water were also found to provide reasonable estimates, but require as input physical and chemical parameters which are not readily accessible.

关键词： organic pollutants octanol/water partition coefficient activity coefficient solubility high performance reverse phase liquid chromatography

来源：评论

学校读者我要写书评

暂无评论

DETERMINATION OF PARTITION-COEFFICIENTS AND AQUEOUS SOLUBILITIES BY REVERSE PHASE CHROMATOGRAPHY .1. THEORY AND BACKGROUND

引用

water RESEARCH 1986年第11期20卷 1433-1442页

作者： WEBER, WJ CHIN, YP RICE, CP Water Resources and Environmental Engineering Program 181 Engineering Building I-A The University of Michigan Ann Arbor MI 48109 U.S.A.

water solubilities and octanol/water partition coefficients are widely used to predict partitioning and bioconcentration phenomena for hydrophobic organic pollutants in aqueous systems. This paper is the first in a two part series describing the application of high performance reverse phase liquid chromatography (HPRPLC) for indirect estimation of these two physiocochemical parameters to facilitate environmental fate and transport predictions for organic compounds. In the first part, thermodynamic factors which control partitioning processes, water solubilities, and reverse phase retention behavior are discussed, and models for interlinking these three properties are summarized. The second part presents the results of aqueous solubility and octanol/water partition coefficient predictions for a number of organic contaminants from measurements of their HPRPLC behavior, and compares the modeling capabilities of some of the theoretical partitioning/solubility equations developed in the first paper.

关键词： organic pollutants soil/sediment sorption bioconcentration activity coefficient solubility octanol/water partition coefficient high performance reverse phase liquid chromatography

来源：评论

学校读者我要写书评

暂无评论

Performance of long-term, field-scale bioremediation process

引用

JOURNAL OF HAZARDOUS MATERIALS 1996年第2-3期50卷 105-128页

作者： Loehr, RC Webster, MT Environmental Water Resources Engineering Program Civil Engineering Department ECJ 9.102F The University of Texas at Austin Austin TX 78712 USA

The behavior of chemicals over long periods of time must be investigated to assess the effectiveness of bioremediation. Three long-term, field-scale studies are presented and demonstrate the effectiveness of bioremediation at reducing chemical concentrations, mobility, and toxicity in soils and sludges over long time-periods. Two case studies described the land-treatment of wood-treatment site soils and sludges while the third case study described the land-treatment of oily wastes from petroleum industry operations. These long-term studies confirmed that chemicals in bioremediation residues are contained in treated soils, that chemical concentrations continue to decline after active remediation stops, and that toxicity is reduced. Even though significant concentrations of chemicals were present in the residuals, the toxicity and mobility of the residual chemicals and, therefore, the risk associated with them, had been substantially reduced,

关键词： bioremediation toxicity mobility risk environmentally acceptable endpoint wood treatment petroleum hydrocarbon

来源：评论

学校读者我要写书评

暂无评论

Implications of technological improvement and circular agriculture on environmental sustainability of sugarcane production

Cleaner Environmental Systems

引用

Cleaner environmental Systems 2025年 18卷

作者： Aakriti Deuja Min Hein Khant Thapat Silalertruksa Shabbir H. Gheewala Trakarn Prapaspongsa Graduate Program in Environmental and Water Resources Engineering Department of Civil and Environmental Engineering Faculty of Engineering Mahidol University Nakhon Pathom Thailand Department of Environmental Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand The Joint Graduate School of Energy and Environment King Mongkut's University of Technology Thonburi Bangkok Thailand Centre of Excellence on Energy Technology and Environment Ministry of Higher Education Science Research and Innovation Bangkok Thailand

The spatially differentiated environmental impacts and associated costs of technological improvement and circular agricultural practices in sugarcane production were assessed. Analysis of the cause-effect relationship between the key processes and substances each helped develop alternative scenarios for impact reduction. PM 2.5 emissions contributed to 92 % of the total human health impacts from open burning of field residues. Freshwater ecotoxicity, mainly due to ametryn emissions from pesticide application, contributed to 47 % of the total damage to the ecosystem. The environmental costs were 116 % higher than the value of sugarcane production, signifying the critical importance of adopting alternative pathways that provide economic benefits from environmental cost reduction compared to the production value. Scenarios considering green cane harvesting and waste management approaches demonstrated high potential for total impact reduction of 99 % and 97 %, respectively, and economic gains of 202 and 225 billion THB, respectively (5.76 and 6.42 billion USD, respectively). The economic benefits of waste utilization were 137 % higher than the value of sugarcane production, demonstrating the potential benefits of product substitution to help mitigate impacts. The core findings highlight the significance of the PM 2.5 impact-related external costs and underscore the benefits of adopting green cane harvesting in conjunction with on-field waste utilization to mitigate the impact of open burning and produce value-added products. Technological improvement and circular agricultural practices coupled with valuation of spatially differentiated impacts can provide useful and more accurate information to policymakers, to prioritize the implementation of mitigation strategies for enhancing the environmental sustainability of sugarcane production.

关键词： Life cycle assessment On-site and supply chain emissions Human health Ecosystem environmental cost environmental sustainability

来源：评论

学校读者我要写书评

暂无评论

Metagenomic Analysis Reveals Altered Microbial Diversity and Function Along a Depth/Age Gradient in a Sanitary Landfill

SSRN

引用

SSRN 2025年

作者： Liu, Xinyi Xia, Mengjing Li, Zhenshan Gao, Qun Yan, Shao Yang, Yunfeng State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China International College Beijing University of Agriculture Beijing102206 China College of Environmental Science and Engineering State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems Peking University Beijing100871 China Institute of Resources and Environment Beijing Academy of Science and Technology No. 27 Xisanhuanbei Road Haidian District Beijing100095 China Institute of Environment and Ecology Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China

Landfills are unique terrestrial ecosystems with some specific traits, such as extremely high heterogeneity, drastic exhaustion and accumulative stress from various toxic contaminants along with depth/age. However, the microbial community structure of this unique ecosystem is poorly understood. Here, we examined the microbial communities along with landfill depth and age (LDA) in a sanitary landfill in Beijing, China using 16s rRNA Illumina sequencing and GeoChip 4.6. Surprisingly, in contrast with the decreased microbial diversity along with depth in soil, we found that both phylogenetic and functional diversities were higher in deeper and older refuse in the landfill. Phylogenetic compositions were obviously different in the refuse with the same LDA and such difference is mainly attributed to the heterogeneity of refuse instead of random process. Nevertheless, functional structures were similar within the same LDA, indicating that microbial community assembly in the landfill may be better reflected by functional genes rather than phylogenetic identity. Dissimilarity test showed significantly different functional structures along with LDA. Higher abundance of stress response genes, organic remediation genes, and metal resistance genes in deeper and older refuse indicated that they may be required by microorganisms in response to the more stressful environments;and their significantly positive correlations with functional diversity implied that stress was an important factor influencing functional diversity. This study not only provides guidance for acceleration of landfill stabilization and in situ remediation, but also suggests a potential of landfill as the model ecosystem to investigate the response of microbial community to tolerable stress. © 2025, The Authors. All rights reserved.

关键词： Microorganisms

来源：评论

学校读者我要写书评

暂无评论

A novel open-source framework for automatic flocculation kinetics and retention time modelling using image analysis and swarm intelligence

引用

Journal of water Process engineering 2025年 74卷

作者： Bankole, Abayomi O. Moruzzi, Rodrigo Negri, Rogério G. Campos, Luiza C. Department of Civil and Environmental Engineering São Paulo State University (UNESP) Bauru Campus São Paulo Brazil Institute of Science and Technology São Paulo State University (UNESP) São Paulo São José dos Campos Brazil Department of Water Resources Management and Agrometeorology COLERM Federal University of Agriculture Abeokuta Nigeria Graduate Program in Natural Disasters (UNESP/CEMADEN) São Paulo São José dos Campos Brazil Centre for Urban Sustainability and Resilience Department of Civil Environmental and Geomatic Engineering University College London Gower Street London WC1E 6BT United Kingdom

Automatic detection of flocculation kinetic mechanisms and total hydraulic retention time (THRT) in multi-chamber systems in series is essential for seamless water treatment modelling. This study presents the first open-source tool for modelling flocculation kinetics and THRT in multi-chambers systems, with their sensitivity to image analysis. This study introduces three key novelties: (1) a non-derivative Secant method for simulating THRT, (2) use of Particle Swarm Optimization (PSO) algorithm to facilitate curve fitting technique for modelling flocculation kinetic coefficients, and (3) automatic retention time modelling directly from floc images, including sensitivity to threshold-based image segmentation. The proposed Secant method demonstrated greater robustness compared to the existing Newton-Raphson method (N-R), as it avoided convergence in cases where the N-R produced negative retention times. The PSO algorithm produced results comparable to the Bayesian approach, with aggregation coefficients of 2.773 × 10⁻⁴ and 1.905 × 10⁻⁴, and breakage coefficients of 1.186 × 10⁻⁶ and 2.656 × 10⁻⁶, at low and high velocity gradients (G), respectively. Flocculation kinetics at low G has steady aggregation followed by a dynamic equilibrium, while high G exhibited rapid formation of fragile flocs, followed by dominant breakage mechanism, and a later lower equilibrium. Scaled G for multi-chamber systems showed that reactor configurations with an immediate low G in the second chamber resulted in an average 50 % decrease in THRT. Finally, aggregation and breakage coefficients were sensitive to image segmentation thresholds, but THRT sensitivity is limited. The deployed model is accessible to improve flocculation modelling for multi-chambers in series (https://***). © 2025 Elsevier Ltd

关键词： Aggregation and breakage coefficients Completely stirred tank reactor Flocculation kinetics Intelligent water treatment monitoring System automation

来源：评论

学校读者我要写书评

暂无评论

GENERATING INSTITUTIONAL AND PUBLIC SUPPORT FOR A STATEWIDE GROUNDwater PROTECTION STRATEGY BASED ON IDENTIFICATION AND ASSESSMENT OF GROUNDwater CONTAMINATION POTENTIAL AT 316 SITES IN MASSACHUSETTS, USA

引用

SCIENCE OF THE TOTAL ENVIRONMENT 1981年第NOV期21卷 373-382页

作者： TUFTS, N BOWLEY, DR CHALPIN, R Massachusetts Water Resources Commission USA Office of Planning and Program Management Massachusetts Department of Environmental Quality Engineering USA Central Hazardous Waste Coordinator Massachusetts Department of Environmental Quality Engineering USA

Recently, the Massachusetts Department of environmental Quality engineering (DEQE) completed a study of the groundwater pollution potential of liquid waste impoundments. Known as the Surface Impoundments Assessments (SIA), this project was part of a federally funded examination of the widespread practice of storing waste materials in pits, ponds, and lagoons. It was conducted in all States and Territories of the United States through the auspices of the U. S. environmental Protection Agency (EPA) under the authority of the Safe Drinking water Act. In most states, Massachusetts among them, this was the first systematic review of the practice. This Assessment has also served as a catalyst to focus attention upon the systematic and coordinated protection of groundwater. The Division of Hazardous Wastes, responsible for individual site inspection and regulation, has devised a program of central and regional State staff, and local volunteer agent cooperation in the municipalities. This program may provide a useful model for efficient use of technical staff time when an agency is suddenly confronted by a large number of potential problems and a short time for review before necessary effective action.

关键词： Groundwater protection Public awareness Waste disposal

来源：评论

学校读者我要写书评

暂无评论

Communal-based domestic rainwater harvesting system: A novel approach to alternative solutions for increasing water supply and recharging groundwater in Jagakarsa urban area, South Jakarta

Case Studies in Chemical and Environmental Engineering

引用

Case Studies in Chemical and environmental engineering 2025年 11卷

作者： Suprapti, Suprapti Kusuma, Muhammad Syahril Badri Kardhana, Hadi Cahyono, Muhammad Juliana, Imroatul Chalimah Doctoral Program of Civil Engineering Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Jawa Barat Bandung 40132 Indonesia Water Resources Engineering Group Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Jawa Barat Bandung 40132 Indonesia Civil Engineering Department Faculty of Engineering and Sciences Ibnu Khaldun Bogor University Jl. Sholeh Iskandar Km. 2 Jawa Barat Kota Bogor 16162 Indonesia Research Center for Ecohydrology Ecohydraulics and Engineering Science Bandung Jl. Babakan Jeruk 1 No. 100 Jawa Barat Bandung 40132 Indonesia Civil Engineering Study Program Sriwijaya University Jl. Raya Lintas Timur Palembang - Prabumulih No. Km. 32 Indralaya Indah South Sumatra Indralaya Indonesia Study Program of Civil Engineering Faculty of Engineering Universitas Mercu Buana Jl. Meruya Selatan No. 01 Kembangan-Jakarta Barat Jakarta 11650 Indonesia

This study proposes a new approach, a communal-based domestic rainwater harvesting (CDRWH) system, which is a new model that combines domestic and communal rainwater harvesting systems. This model is an alternative solution to improve system performance and utilize rainwater overflow from the system. Rainwater runoff from several domestic tanks is channeled to a communal tank to be collected, processed, and redistributed to needy domestic tanks. Overflow from the communal tank is used for groundwater recharge. The CDRWH system model aims to increase water supply, reduce runoff, and conserve groundwater. The model simulation uses daily water balance analysis and yield before spillage algorithm. The simulation scenario uses variations in roof area, number of house occupants, storage tank volume, and rainfall categories: 20 years, wet year, normal year, and dry year. Jagakarsa, an urban area in South Jakarta, was selected for the CDRWH system modeling. The results showed that the CDRWH model significantly improved the performance of the volumetric reliability (VR) and time reliability (TR) systems. In addition, the model could show a comparison of total groundwater recharge (GWR) and groundwater extraction (GWE), where the GWR capacity was higher. This allows centralized rainwater management in communal tanks, thereby reducing groundwater usage. The design of this model is simple. Therefore it can be easily duplicated for application in other locations. © 2025 The Authors

关键词： Communal-based domestic rainwater harvesting (CDRWH) Groundwater extraction (GWE) Groundwater recharge (GWR) Jagakarsa-South Jakarta Reduced runoff water supply

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：