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Elsevier

Books in Wastewater treatment

  • Nanocellulose for Water Purification

    Advancements, Applications, and Environmental Impact
    • 1st Edition
    • Sabu Thomas + 3 more
    • English
    Nanocellulose for Water Purification: Advancements, Applications, and Environmental Impact provides a comprehensive overview on the properties, modifications, and applications of nanocellulose-based materials for addressing water pollution. Initial chapters introduce the fundamental aspects of nanocellulose, including its origin, characteristics, and properties, while subsequent chapters discuss surface functionalization and modification techniques that improve the adsorption capabilities of nanocellulose. Next, readers will find an overview of the different forms of nanocellulose-based adsorbents, such as films, membranes, hydrogels, and aerogels, highlighting their effectiveness in removing various pollutants, including agrochemicals, organic solvents, cationic and anionic dyes, heavy metals, lipids, and pharmaceutical contaminants.The final chapters address the environmental and economic implications of nanocellulose advancements in water purification technologies and discuss the challenges and future directions in the field. This book serves as an important resource for researchers and industry professionals in nanotechnology, materials science, polymer science, environmental engineering, and chemical engineering, providing detailed information on the innovative use of nanocellulose in water treatment applications.

  • Per- and Polyfluoroalkyl Substances (PFAS) as Environmental Contaminants

    Materials and Technologies for Advancements in Water and Soil Remediation
    • 1st Edition
    • Dimitrios A Giannakoudakis + 1 more
    • English
    Per- and Polyfluoroalkyl Substances (PFAS) as Environmental Contaminants: Materials and Technologies for Advancements in Water and Soil Remediation offers a comprehensive examination of the challenges posed by PFAS contamination and the innovative solutions available for remediation. This book delves into the chemical properties, toxicity mechanisms, and environmental persistence of PFAS, while exploring advanced remediation technologies such as adsorption, catalysis (e.g., chemical oxidation, sonocatalysis, and photocatalysis), and phytoremediation. By consolidating current knowledge and showcasing new approaches, this book equips readers with the tools necessary to address PFAS contamination effectively, advancing research and practice in environmental health and safety. It also highlights emerging materials like metal-organic frameworks and activated carbons that enhance remediation efforts, providing practical insights and case studies throughout.

  • Two-Dimensional Nanomaterials for Water Purification

    Advances and Applications
    • 1st Edition
    • Edison Ang Huixiang
    • English
    Two-Dimensional Nanomaterials for Water Purification: Advances and Applications explores the transformative potential of 2D nanomaterials in enhancing water purification technologies, covering a wide range of applications, including filtration membranes, membrane distillation, solar evaporation, photocatalytic treatment, antibacterial strategies, adsorption, and capacitive deionization. The book begins with an overview of fundamental separation mechanisms, design configurations for various purification technologies, and material characterization techniques specific to 2D nanomaterials. Following chapters discuss computational approaches, advanced fabrication methods, and performance comparisons, all while emphasizing sustainability in water treatment.This comprehensive resource provides researchers and engineers with valuable information about the potential applications and future directions of 2D nanomaterial-based water purification technologies.

  • Technologies for Soil and Water Pollution Remediation

    • 1st Edition
    • Sivakumar Uthandi + 3 more
    • English
    Technologies for Soil and Water Pollution Remediation explores advanced microbial methods and practical solutions for effectively addressing soil and water contamination. The book addresses critical issues in soil and water pollution while outlining the pressing environmental challenges associated with soil and water contamination, emphasizing the urgent need for effective remediation strategies. Sections highlight the identification and classification of contaminants, their sources, and impacts on ecosystems and human health. Key methodologies discussed include advanced bioremediation techniques, phytoremediation, and emerging technologies such as microbial electrogenesis and photocatalytic treatments.

  • Green and Sustainable Synthesis of Iron Oxide-Based Nanomaterials for Energy and Environmental Applications

    • 1st Edition
    • Uma Shanker + 1 more
    • English
    Green and Sustainable Synthesis of Iron Oxide-Based Nanomaterials for Energy and Environmental Applications explores various synthesis methods of iron and iron oxide nanoparticles, with an emphasis on green synthesis – a sustainable and eco-friendly method. The book investigates a range of alternative routes to the synthesis of iron-based nanomaterials, such as using microorganisms (fungi, bacteria, actinomycetes), algae, green plants, and various biocompatible green reagents such as biopolymers, cellulose, and biomass. Furthermore, the effects of various parameters used in the green synthesis approach are examined in order to provide a clear image of the physicochemical features of the nanomaterials created.

  • Algal Biorefinery

    A Sustainable Solution for Environmental Applications
    • 1st Edition
    • Sanjeet Mehariya + 3 more
    • English
    Algal Biorefinery: A Sustainable Solution for Environmental Applications focuses on algae's possibilities, assets, and functions as a renewable and sustainable resource that can act as an excellent alternative to withstand adverse environmental conditions to generate useful products. Thus, apart from helping reduce environmental pollution and the carbon footprint, algae can help mitigate factors causing rapid climate change via concurrent bioremediation, resource recovery, and environmental sustainability.This comprehensive book will examine dedicated state-of-the-art information on the topic of how algae can act as a cushion against climate change. It will also explain how algal-based biorefineries can act as a potential solution to climate change, lack of natural resources, and environmental pollution

  • Water Security: Big Data-Driven Risk Identification, Assessment and Control of Emerging Contaminants

    • 1st Edition
    • Bin Liang + 2 more
    • English
    Water Security: Big Data-Driven Risk Identification, Assessment and Control of Emerging Contaminants contains the latest information on big data-driven risk detection and analysis, risk assessment and environmental health effect, intelligent risk control technologies, and global control strategy of emerging contaminants. First, this book highlights advances and challenges throughout the detection of emerging chemical contaminants (e.g., antimicrobials, microplastics) by sensors or mass spectrometry, as well as emerging biological contaminant (e.g., ARGs, pathogens) by a combination of next- and third-generation sequencing technologies in aquatic environment. Second, it discusses in depth the ecological risk assessment and environmental health effects of emerging contaminants. Lastly, it presents the most up-to-date intelligent risk management technologies.This book shares instrumental global strategy and policy analysis on how to control emerging contaminants. Offering interdisciplinary and global perspectives from experts in environmental sciences and engineering, environmental microbiology and microbiome, environmental informatics and bioinformatics, intelligent systems, and knowledge engineering, this book provides an accessible and flexible resource for researchers and upper level students working in these fields.

  • Water Resources Management for Rural Development

    Challenges and Mitigation
    • 1st Edition
    • Sughosh Madhav + 3 more
    • English
    Water Resources Management for Rural Development: Challenges and Mitigation provides an overview of the current challenges of rural water and its management strategies. The content contains practical and theoretical aspects of the water crisis in rural areas in a changing climate era, with an emphasis on recent water crisis research and management strategies. The book's structure contains fundamentals of water resources, pollution, remediation, supply and management strategies. Case studies included provide different water-related issues around the globe, introducing the reader to the paths of reducing the burden on the groundwater and the alternative options for the supply of water in rural areas. Decision-makers and water supply authorities will benefit from this unique resource that comprehensively covers rural water management in ways no comparable book has achieved.

  • Groundwater Economics and Policy in South Asia

    • 1st Edition
    • M. Dinesh Kumar
    • English
    Groundwater Economics and Policy in South Asia is a reference guide focusing on groundwater management and groundwater economics in South Asia. The author compares the regional variations across South Asia and the public policies that shaped the groundwater sector and presents the most up-to-date information on groundwater management using practical case-studies and empirical data. With the inclusion of strong methodological solutions for sustainable groundwater management, scholars in the fields of geohydrology, agricultural sciences, water resource economics, and professionals in water science and policy will get access to the latest policies and methods used in groundwater research in South Asia.

  • Resource Recovery in Municipal Waste Waters

    • 1st Edition
    • Mika Sillanpää + 2 more
    • English
    Resource Recovery in Municipal Waste Waters provides various municipal wastewater remediation methods and techniques to recover materials from such wastewaters. Sections cover the basic principles of resource recovery, along with the recovery of methane, phosphorous, electricity and metals. The volume covers comprehensive cutting-edge techniques for resource recovery and municipal wastewater treatment and reports on new findings in these areas. It also introduces polluted waters as new and sustainable sources rather than seeing wastewaters as a source of hazardous organic and inorganic matters. The main advantages and disadvantages of both wastewater/polluted water treatment and recovery are also discussed. This three-volume set stresses the importance of contaminated waters remediation, including surface waters, municipal or industrial wastewaters, treating these waters as a new source of nutrients, minerals and energy.

  • Water, Land, and Forest Susceptibility and Sustainability, Volume 2

    Insight Towards Management, Conservation and Ecosystem Services
    • 1st Edition
    • Uday Chatterjee + 4 more
    • English
    Water, Land, and Forest Susceptibility and Sustainability, Volume 2: Insight Towards Management, Conservation and Ecosystem Services brings an interdisciplinary perspective to solving complex problems in sustainability, utilizing the latest research and technologies, and includes case studies that emphasize the applications of remote sensing, GIS, and image processing for addressing the current state and future needs to achieve sustainability. As forests, land, and water are among the most precious resources on earth, emphasizing the need to conserve them for future generations and, of course, a safe and sustainable planet. The assessment of the susceptibility of all these three precious resources must therefore be addressed to inform their sustainable management. This second volume focuses on environmental management, conservation, and ecosystem services and provides information on forest, land, and water resources, presenting in integrated manner various aspects of their characterization, susceptibility, and sustainability.

  • Valorization of Microalgal Biomass and Wastewater Treatment

    • 1st Edition
    • Suhaib A. Bandh + 1 more
    • English
    Valorization of Microalgal Biomass and Wastewater Treatment provides tools, techniques, data and case studies to demonstrate the use of algal biomass in the production of valuable products like biofuels, food and fertilizers, etc. Valorization has several advantages over conventional bioremediation processes as it helps reduce the costs of bioprocesses. Examples of several successfully commercialized technologies are provided throughout the book, giving insights into developing potential processes for valorization of different biomasses. Wastewater treatment by microalgae generates the biomass, which could be utilized for developing various other products, such as fertilizers and biofuels. This book will equip researchers and policymakers in the energy sector with the scientific methodology and metrics needed to develop strategies for a viable transition in the energy sector. It will be a key resource for students, researchers and practitioners seeking to deepen their knowledge on energy planning, wastewater treatment and current and future trends.

  • Cost Effective Technologies for Solid Waste and Wastewater Treatment

    • 1st Edition
    • Srujana Kathi + 2 more
    • English
    Cost-Effective Technologies for Solid Waste and Wastewater Treatment synthesizes methods, case studies, and analyses of various state-of-the-art techniques for removing contaminants from wastewater, solid waste, or sewage and converting or reusing the waste with minimum impact on the environment. Focusing on innovative treatment strategies, as well as recent modifications to conventional processes, the book covers methods for a complex variety of emerging pollutants, including organic matter, chemicals, and micropollutants resulting from developmental and industrial activities.Serving as a practical guide to state-of-the-art methods, Cost-Effective Technologies for Solid Waste and Wastewater Treatment also delivers offers foundational information on the practical design of treatment and reuse systems and explains the treatments in terms of scale, efficiency, and effectiveness. It focuses on cost-effective technologies that are particularly applicable to environmental clean-up, such as bioaugmentation and biostimulation of plastics, activated carbon, phytoremediation, crude oil pollution stress, adsorbents, contaminants of emerging concern, anaerobic digestion, ISCO, biosorption, bioremediation, radioactive contaminants, constructed wetlands, nanoremediation, and rainwater. As such, it is a valuable and practical resource for researchers, students, and managers in the fields of environmental science and engineering, as well as wastewater management, chemical engineering, and biotechnology.

  • Low Cost Wastewater Bioremediation Technology

    Innovative Treatment of Sulfate and Metal-Rich Wastewater
    • 1st Edition
    • Jayanta Bhattacharya + 2 more
    • English
    Low Cost Wastewater Bioremediation Technology: Innovative Treatment of Sulphate and Metal Rich Wastewater provides users with an authoritative guide on the technologies, processes and considerations needed for the treatment of Sulphate and Metal rich wastewaters. In this book, the authors not only explain the associated technologies, but also provide suitable alternatives to commercial treatment in terms of performance and cost effectiveness. As enormous quantities of sulphates and metal-rich contaminates are released into the environment each year, the technologies noted in the book provide the most eco-friendly, low cost and efficient alternatives available.

  • Industrial Water Treatment Process Technology

    • 1st Edition
    • Parimal Pal
    • English
    Industrial Water Treatment Process Technology begins with a brief overview of the challenges in water resource management, covering issues of plenty and scarcity-spatial variation, as well as water quality standards. In this book, the author includes a clear and rigorous exposition of the various water resource management approaches such as: separation and purification (end of discharge pipe), zero discharge approach (green process development), flow management approach, and preservation and control approach. This coverage is followed by deeper discussion of individual technologies and their applications.

  • Current Developments in Biotechnology and Bioengineering

    Biological Treatment of Industrial Effluents
    • 1st Edition
    • Duu-Jong Lee + 4 more
    • English
    Current Developments in Biotechnology and Bioengineering: Biological Treatment of Industrial Effluents provides extensive coverage of new developments, state-of-the-art technologies, and potential future trends in data-based scientific knowledge and advanced information on the role and application of environmental biotechnology and engineering in the treatment of industrial effluents. These treatment processes have been broadly classified under aerobic and anaerobic processes which determines the scope and level of pollutant removal. Chapters in this volume review the most recent developments and perspectives at different environmental cleanup operation scales.

  • Nanomaterials for Wastewater Remediation

    • 1st Edition
    • Ravindra Kumar Gautam + 1 more
    • English
    Nanomaterials for Wastewater Remediation introduces techniques for nanoparticle formation and their benefits in environmental cleanup, as well as their recent advances and applications in wastewater treatment. The book follows a sequential approach for the treatment of wastewater, presenting state-of-the-art techniques for the characterization and measurement of nanomaterials. Nanoparticles represent a promising new technology for wastewater remediation, not only because of their high treatment efficiency, but also for their cost effectiveness, as they have the flexibility for in situ and ex situ applications. New methods for developing nanomaterials with less environmental risk are described. Nanomaterials such as magnetic nanoparticles and graphene-based nanocomposites are discussed in detail. Also includes in-depth analyses of the ecotoxicological impacts of nanomaterials and the latest findings on the transport and fate of nanomaterials in the environment.

  • Vertical Flow Constructed Wetlands

    Eco-engineering Systems for Wastewater and Sludge Treatment
    • 1st Edition
    • Alexandros Stefanakis + 2 more
    • English
    Vertical flow constructed wetlands for wastewater and sludge treatment represent a relatively new and still growing technology. Vertical Flow Constructed Wetlands is the first book to present the state-of-the-art knowledge regarding vertical flow constructed wetlands theory and applications. In this book, you will learn about vertical flow systems with information about application and performance. Vertical Flow Constructed Wetlands also includes information on how different countries are applying the technology, with design guidelines to illustrate best practices worldwide. A focus on water conservation through reuse of treated water showcases the benefit of vertical flow construction, which has greatly increased the attractiveness of the technology in recent years.

  • Water Reclamation and Sustainability

    • 1st Edition
    • Satinder Ahuja
    • English
    Many hydrological, geochemical, and biological processes associated with water reclamation and reuse are poorly understood. In particular, the occurrence and effects of trace organic and inorganic contaminants commonly found in reclaimed water necessitates careful analysis and treatment prior to safe reuse. Water Reclamation and Sustainability is a practical guide to the latest water reclamation, recycling, and reuse theory and practice. From water quality criteria and regulations to advanced techniques and implementation issues, this book offers scientists a toolkit for developing safe and successful reuse strategies. With a focus on specific contaminant removal techniques, this book comprehensively covers the full range of potential inorganic/organic contaminating compounds and highlights proven remediation methods. Socioeconomic implications related to current and future water shortages are also addressed, underscoring the many positive benefits of sustainable water resource management.

  • Environmental Water

    Advances in Treatment, Remediation and Recycling
    • 1st Edition
    • V.K. Gupta + 1 more
    • English
    The world is facing a drinking water crisis. Besides continuous population growth, uneven distribution of water resources and periodic droughts have forced scientists to search for new and effective water treatment, remediation and recycling technologies. Therefore, there is a great need for the development of suitable, inexpensive and rapid wastewater treatment and reuse or conservation methods. This title discusses different types of wastewater treatment, remediation and recycling techniques, like adsorption, membrane filtration and reverse osmosis. It also provides guidance for the selection of the appropriate technologies or their combinations for specific applications so that one can select the exact and accurate technology without any problem. The book comprises detailed discussion on the application of various technologies for water treatment, remediation and recycling technologies and provides an update on the development in water treatment, detailed analysis of their features and economic analysis, bridging the current existing information gap. Each chapter is also documented by references and updated citations.

  • Liquid Membranes

    Principles and Applications in Chemical Separations and Wastewater Treatment
    • 1st Edition
    • Vladimir S Kislik
    • English
    Liquid Membranes: Principles and Applications in Chemical Separations and Wastewater Treatment discusses the principles and applications of the liquid membrane (LM) separation processes in organic and inorganic chemistry, analytical chemistry, biochemistry, biomedical engineering, gas separation, and wastewater treatment. It presents updated, useful, and systematized information on new LM separation technologies, along with new developments in the field. It provides an overview of LMs and LM processes, and it examines the mechanisms and kinetics of carrier-facilitated transport through LMs. It also discusses active transport, driven by oxidation-reduction, catalytic, and bioconversion reactions on the LM interfaces; modifications of supported LMs; bulk aqueous hybrid LM processes with water-soluble carriers; emulsion LMs and their applications; and progress in LM science and engineering. This book will be of value to students and young researchers who are new to separation science and technology, as well as to scientists and engineers involved in the research and development of separation technologies, LM separations, and membrane reactors.

  • Electrical Submersible Pumps Manual

    Design, Operations, and Maintenance
    • 1st Edition
    • Gabor Takacs
    • English
    Ideal for removing large amounts of liquids from wells, Electrical Submersible Pumps (ESP) are perhaps the most versatile and profitable pieces of equipment in a petroleum company's arsenal. However, if not properly maintained and operated, they could quickly become an expensive nightmare. The first book devoted to the design, operation, maintenance, and care, Electrical Submersible Pumps Manual delivers the tools and applicable knowledge needed to optimize ESP performance while maximizing of run life and the optimization of production. The prefect companion for new engineers who need to develop and apply their skills more efficiently or experienced engineers who wish further develop their knowledge of best practice techniques, this manual covers basic electrical engineering, hydraulics and systems analysis before addressing pump components such as centrifugal pumps, motors, seals, separators, and cables. In addition, the author includes comprehensive sections on analysis and optimization, monitoring and trouble-shooting, and installation design and installation under special conditions.

  • Wetland Systems to Control Urban Runoff

    • 1st Edition
    • M. Scholz
    • English
    Wetland Systems to Control Urban Runoff integrates natural and constructed wetlands, and sustainable drainage techniques into traditional water and wastewater systems used to treat surface runoff and associated diffuse pollution. The first part of the text introduces the fundamentals of water quality management, and water and wastewater treatment. The remaining focus of the text is on reviewing treatment technologies, disinfection issues, sludge treatment and disposal options, and current case studies related to constructed wetlands applied for runoff and diffuse pollution treatment. Professionals and students will be interested in the detailed design, operation, management, process control and water quality monitoring and applied modeling issues.

  • The Environmental Science of Drinking Water

    • 1st Edition
    • Patrick Sullivan + 2 more
    • English
    In today’s chemically dependent society, environmental studies demonstrate that drinking water in developed countries contains numerous industrial chemicals, pesticides, pharmaceuticals and chemicals from water treatment processes. This poses a real threat. As a result of the ever-expanding list of chemical and biochemical products industry, current drinking water standards that serve to preserve our drinking water quality are grossly out of date. Environmental Science of Drinking Water demonstrates why we need to make a fundamental change in our approach toward protecting our drinking water. Factual and circumstantial evidence showing the failure of current drinking water standards to adequately protect human health is presented along with analysis of the extent of pollution in our water resources and drinking water. The authors also present detail of the currently available state-of-the-art technologies which, if fully employed, can move us toward a healthier future.

  • Nanofiltration

    Principles and Applications
    • 1st Edition
    • A Schaefer + 2 more
    • A Schaefer + 2 more
    • English
    Nanofiltration processes are finding wide applications in several 'wet' industries, such as water/wastewater treatment, water re-use, textile industry, diary industry, food industry and the pulp and paper industries. Despite this, no definitive book exists which covers the principles of the techniques and their potential and actual applications. ' Nanofiltration: Principles and Applications ' is edited by three well-known specialists from Australia, and contains chapters from top international authorities. The result is a comprehensive and up to date account which will be essential reading for membrane designers, manufacturers and end-users worldwide.

  • Handbook of Water and Wastewater Microbiology

    • 1st Edition
    • Duncan Mara + 1 more
    • English
    "Access to safe water is a fundamental human need and therefore a basic human right" --Kofi Annan, United Nations Secretary General Edited by two world-renowned scientists in the field, The Handbook of Water and Wastewater Microbiology provides a definitive and comprehensive coverage of water and wastewater microbiology. With contributions from experts from around the world, this book gives a global perspective on the important issues faced in the provision of safe drinking water, the problems of dealing with aquatic pollution and the processes involved in wastewater management. Starting with an introductory chapter of basic microbiological principles, The Handbook of Water and Wastewater Microbiology develops these principles further, ensuring that this is the essential text for process engineers with little microbiological experience and specialist microbiologists alike.

  • Handbook of Water and Wastewater Treatment Technologies

    • 1st Edition
    • Nicholas P Cheremisinoff
    • English
    This Handbook is an authoritative reference for process and plant engineers, water treatment plant operators and environmental consultants. Practical information is provided for application to the treatment of drinking water and to industrial and municipal wastewater. The author presents material for those concerned with meeting government regulations, reducing or avoiding fines for violations, and making cost-effective decisions while producing a high quality of water via physical, chemical, and thermal techniques.Included in the texts are sidebar discussions, questions for thinking and discussing, recommended resources for the reader, and a comprehensive glossary.Two companion books by Cheremisinoff are available:Handbook of Air Pollution Control Technologies, and Handbook of Solid Waste Management and Waste Minimization Technologies.

  • Advances in Water and Wastewater Treatment Technology

    Molecular Technology, Nutrient Removal, Sludge Reduction, and Environmental Health
    • 1st Edition
    • T. Matsuo + 3 more
    • English
    This book is the result of the international symposium, "Establishment and Evaluation of Advanced Water Treatment Technology Systems Using Functions of Complex Microbial Community", organized in 2000 at the University of Tokyo. The volume presents the most recent progress in application of microbial community analysis, health-related microorganisms management, nutrient removal, waste sludge minimization and materials recovery, and water management in tropical countries.Included in this work are the following major topics in wastewater treatment: application of various innovative techniques of molecular biology such as FISH, DGGE to microbial community analysis of various types of wastewater treatment; microbial aspect of biological removal of nitrogen and phosphorus; emission of nitrous oxide during nitrogen transformation; reduction of sludge production in the wastewater treatment process using membrane and material recovery of biopolymer and cell of photosynthetic bacteria.Health-rela... microbiology in water supply and water management using recent innovative molecular biological tools is presented and health risk management is discussed. The practical application of wastewater treatment in developing countries, especially tropical countries is also reviewed.Researchers in the field of environmental engineering and applied microbiology, and practical engineers who wish to learn the most recent progress in the microbiological aspect of water and wastewater management, will find this book a useful tool.

  • The Removal of Nitrogen Compounds from Wastewater

    • 1st Edition
    • Volume 54
    • B. Halling-Sørensen + 1 more
    • English
    This volume gives an overview of the wide spectrum of nitrogen removal processes available today. Part A gives a brief outline of nitrogen pollution sources, the global nitrogen cycle and the treatment methods; part B presents details of all biological methods for nitrogen removal; and part C describes the physico-chemical nitrogen removal methods. Design examples relating to parts B and C are given in appendices.Design equations are given in the text, but more emphasis has been placed on the profound understanding of the biological and chemical processes and the basic factors that influence these. Parameters and regression equations for a quantitive description of these factors and their influence on the key processes are presented in several tables. This feature makes the volume a very useful handbook; it will be of great value to those environmentalists who require a record of the available nitrogen removal methods from both biological and chemical viewpoints.

  • Phosphorus Removal from Wastewater

    • 1st Edition
    • Robert P.G. Bowker + 1 more
    • English
    A guide to selecting the proper phosphorus removal strategy in wastewater treatment.

  • Fine Pore Aeratio

    • 1st Edition
    • Bozzano G Luisa
    • English
    Fine Pore Aeration for Wastewatr.Trmt.

  • Control of Organic Substances in Water and Wastewater

    • 1st Edition
    • Bozzano G Luisa
    • English
    Control of Organic Substances in Water and Wastewater