Test No 209 Activated Sludge Respiration Inhibition Test Carbon And Ammonium Oxidation

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Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation)

Author : Organisation for Economic Co-operation and Development
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (99 download)

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Book Synopsis Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation) by : Organisation for Economic Co-operation and Development

Download or read book Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation) written by Organisation for Economic Co-operation and Development and published by . This book was released on 2010 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Test Guideline is designed to assess the effects of a substance on micro-organisms from activated sludge of waste-water treatment plants by measuring their respiration rate (carbon and/or ammonium oxidation) as oxygen consumption. The test results may also serve as an indicator of suitable non-inhibitory concentrations of test substances to be used in biodegradability tests. The test allows the determination of ECx and/or NOEC values of the test substance. The inhibition of three different oxygen uptakes may be determined, i.e. total, heterotrophic only, and that due to nitrification in the absence and presence of N-allylthiourea, a specific nitrification inhibitor. For obtaining both NOEC and ECx, six controls and five treatment concentrations in a geometric series with five replicates are recommended. In each test vessel, test mixtures containing water, synthetic sewage feed and the test substance are incubated at the pH of 7.5 ±0.5 and the temperature within 20±2°C under forced aeration to keep the dissolved oxygen concentration above 60-70% saturation. The oxygen consumption is measured after 3 hours of exposure and additional measurements at 30 minutes of exposure can be performed in the case that the test substance is rapidly degraded.

OECD Guidelines for the Testing of Chemicals, Section 2 Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation)

Download OECD Guidelines for the Testing of Chemicals, Section 2 Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation) PDF Online Free

Author : OECD
Publisher : OECD Publishing
ISBN 13 : 9264070087
Total Pages : 18 pages
Book Rating : 4.2/5 (64 download)

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Book Synopsis OECD Guidelines for the Testing of Chemicals, Section 2 Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation) by : OECD

Download or read book OECD Guidelines for the Testing of Chemicals, Section 2 Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation) written by OECD and published by OECD Publishing. This book was released on 2010-07-23 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Test Guideline is designed to assess the effects of a substance on micro-organisms from activated sludge of waste-water treatment plants by measuring their respiration rate (carbon and/or ammonium oxidation) as oxygen consumption. The test ...

OECD Guidelines for the Testing of Chemicals, Section 3 Test No. 320: Determining Anaerobic Transformation of Chemicals in Liquid Manure

Download OECD Guidelines for the Testing of Chemicals, Section 3 Test No. 320: Determining Anaerobic Transformation of Chemicals in Liquid Manure PDF Online Free

Author : OECD
Publisher : OECD Publishing
ISBN 13 : 9264466185
Total Pages : 30 pages
Book Rating : 4.2/5 (644 download)

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Book Synopsis OECD Guidelines for the Testing of Chemicals, Section 3 Test No. 320: Determining Anaerobic Transformation of Chemicals in Liquid Manure by : OECD

Download or read book OECD Guidelines for the Testing of Chemicals, Section 3 Test No. 320: Determining Anaerobic Transformation of Chemicals in Liquid Manure written by OECD and published by OECD Publishing. This book was released on 2022-06-30 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Test Guideline describes a standardised method to examine the transformation of chemicals in pig and cattle liquid manure under anaerobic conditions.

Water Quality - Test for Inhibition of Oxygen Consumption by Activated Sludge for Carbonaceous and Ammonium Oxidation (ISO 8192:2007)

Author :
Publisher :
ISBN 13 : 9788325134631
Total Pages : 32 pages
Book Rating : 4.1/5 (346 download)

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Book Synopsis Water Quality - Test for Inhibition of Oxygen Consumption by Activated Sludge for Carbonaceous and Ammonium Oxidation (ISO 8192:2007) by :

Download or read book Water Quality - Test for Inhibition of Oxygen Consumption by Activated Sludge for Carbonaceous and Ammonium Oxidation (ISO 8192:2007) written by and published by . This book was released on 2007 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Applied Microbiology

Author :
Publisher : Academic Press
ISBN 13 : 0323850790
Total Pages : 168 pages
Book Rating : 4.3/5 (238 download)

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Book Synopsis Advances in Applied Microbiology by :

Download or read book Advances in Applied Microbiology written by and published by Academic Press. This book was released on 2021-06-15 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Applied Microbiology, Volume 115 continues the comprehensive reach of this widely read and authoritative review source in microbiology. Users will find invaluable references and information on a variety of areas relating to the topic of microbiology, with this release focusing on the preparation of functional oligosaccharides using microbial coupling fermentation. Contains contributions from leading authorities in the field Informs and updates on the latest developments in the field of microbiology Includes discussions on the role of specific molecules in pathogen life stages, interactions, and much more

Hazardous Pollutants in Biological Treatment Systems

Author : Ferhan Çeçen
Publisher : IWA Publishing
ISBN 13 : 178040770X
Total Pages : 400 pages
Book Rating : 4.7/5 (84 download)

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Book Synopsis Hazardous Pollutants in Biological Treatment Systems by : Ferhan Çeçen

Download or read book Hazardous Pollutants in Biological Treatment Systems written by Ferhan Çeçen and published by IWA Publishing. This book was released on 2017-11-15 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hazardous pollutants are a growing concern in treatment engineering. In the past, biological treatment was mainly used for the removal of bulk organic matter and the nutrients nitrogen and phosphorous. However, relatively recently the issue of hazardous pollutants, which are present at very low concentrations in wastewaters and waters but are very harmful to both ecosystems and humans, is becoming increasingly important. Today, treatment of hazardous pollutants in the water environment becomes a challenge as the water quality standards become stricter. Hazardous Pollutants in Biological Treatment Systems focuses entirely on hazardous pollutants in biological treatment and gives an elaborate insight into their fate and effects during biological treatment of wastewater and water. Currently, in commercial and industrial products and processes, thousands of chemicals are used that reach water. Many of those chemicals are carcinogens, mutagens, endocrine disruptors and toxicants. Therefore, water containing hazardous pollutants should be treated before discharged to the environment or consumed by humans. This book first addresses the characteristics, occurrence and origin of hazardous organic and inorganic pollutants. Then, it concentrates on the fate and effects of these pollutants in biological wastewater and drinking water treatment units. It also provides details about analysis of hazardous pollutants, experimental methodologies, computational tools used to assist experiments, evaluation of experimental data and examination of microbial ecology by molecular microbiology and genetic tools. Hazardous Pollutants in Biological Treatment Systems is an essential resource to the researcher or the practitioner who is already involved with hazardous pollutants and biological processes or intending to do so. The text will also be useful for professionals working in the field of water and wastewater treatment.

Environmentally Friendly and Biobased Lubricants

Author : Brajendra K. Sharma
Publisher : CRC Press
ISBN 13 : 1482232030
Total Pages : 450 pages
Book Rating : 4.4/5 (822 download)

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Book Synopsis Environmentally Friendly and Biobased Lubricants by : Brajendra K. Sharma

Download or read book Environmentally Friendly and Biobased Lubricants written by Brajendra K. Sharma and published by CRC Press. This book was released on 2016-09-19 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Comprehensive Review of Developing Environmentally Friendly Lubricants A push from environmentally savvy consumers along with recent changes in governmental regulations have paved the way for a marketplace of products with high levels of environmental performance. Fueled by the growing demand for biobased lubricants, Environmentally Friendly and Biobased Lubricants highlights the development of environmentally friendly additives that are compatible with environmental regulations and describes the approaches being used in this emerging area. Derived from research topics shared over the years at various technical sessions of the Society of Tribologists and Lubrication Engineers (STLE) Annual Meetings, the book includes a critical assessment of gaps and weaknesses in the field of environmentally friendly fluids and biobased lubricants. Each chapter is written by authors selected from the environmentally friendly fluids and biobased lubricants sessions of STLE and also incorporates input from prominent researchers invited to take part in the book. Expert contributors discuss the control, production, usage, and disposal of lubricants; factor in related policies, laws, and regulations around the world; and include case studies demonstrating the uses and values of commercially viable biobased lubricants. The book is divided into five sections that cover advanced environmentally friendly base oils and feedstocks, biobased hydraulic lubricants and biodegradability, chemically/enzymatically modified environmentally friendly base oils, vegetable oil–based environmentally friendly fluids, and additives for environmentally friendly fluids.

Chemometrics and Cheminformatics in Aquatic Toxicology

Author : Kunal Roy
Publisher : John Wiley & Sons
ISBN 13 : 111968160X
Total Pages : 596 pages
Book Rating : 4.1/5 (196 download)

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Book Synopsis Chemometrics and Cheminformatics in Aquatic Toxicology by : Kunal Roy

Download or read book Chemometrics and Cheminformatics in Aquatic Toxicology written by Kunal Roy and published by John Wiley & Sons. This book was released on 2021-12-01 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Das Buch Chemometrics and Cheminformatics in Aquatic Toxicology befasst sich mit den bestehenden und neu auftretenden Problemen der Verschmutzung der aquatischen Umwelt durch verschiedene metallische und organische Schadstoffe, insbesondere Industriechemikalien, Pharmazeutika, Kosmetika, Biozide, Nanomaterialien, Pestizide, Tenside, Farbstoffe und viele weitere. Es werden verschiedene chemometrische und cheminformatische Instrumente für Laien beschrieben mitsamt ihrer Anwendung auf die Analyse und Modellierung der Toxizitätsdaten von Chemikalien in Bezug auf unterschiedliche aquatische Organismen. Eine Reihe von Datenbanken zur aquatischen Toxizität sowie chemometrische Softwaretools und Webserver werden vorgestellt und praktische Beispiele für die Modellentwicklung gegeben, einschließlich der entsprechenden Abbildungen. Darüber hinaus enthält das Werk Fallstudien und Literaturberichte, um das Verständnis des Themas abzurunden. Außerdem lernen die Leserinnen und Leser Werkzeuge und Protokolle wie maschinelles Lernen, Data Mining sowie Methoden des QSAR-basierten und ligandenbasierten chemischen Designs kennen. Darüber hinaus bietet das Werk: * Eine umfassende Einführung in chemometrische und cheminformatische Instrumente und Techniken, insbesondere maschinelles Lernen und Data Mining * Eine Darstellung von Datenbanken zur aquatischen Toxizität, chemometrischen Softwaretools und Webservern * Praktische Beispiele und Fallstudien zur Verdeutlichung und Veranschaulichung der im Buch enthaltenen Konzepte * Eine kompakte Erläuterung der chemometrischen und cheminformatischen Instrumente sowie ihrer Anwendung auf die Analyse und Modellierung von Toxizitätsdaten Chemometrics and Cheminformatics in Aquatic Toxicology ist ideal für Forschende und Studierende der Chemie sowie der Umwelt- und Pharmawissenschaften und sollte auch in den Bibliotheken von Fachleuten in der chemischen Industrie sowie Aufsichtsbehörden, die sich mit Chemometrie beschäftigen, einen Platz finden.

Water Science and Technology

Author : Nicholas Gray
Publisher : CRC Press
ISBN 13 : 135181785X
Total Pages : 811 pages
Book Rating : 4.3/5 (518 download)

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Book Synopsis Water Science and Technology by : Nicholas Gray

Download or read book Water Science and Technology written by Nicholas Gray and published by CRC Press. This book was released on 2017-04-07 with total page 811 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water has become one of the most important issues of our time intertwined with global warming and population expansion. The management of water supplies and the conservation of water resources remains one of the most challenging yet exciting issues of our time. Water and wastewater treatment technologies are constantly evolving creating an increasingly sustainable industry that is one of the world's largest and most interdisciplinary sectors, employing chemists, microbiologists, botanists, zoologists as well as engineers, computer specialists and a range of different management professionals. This accessible student textbook introduces the reader to the key concepts of water science and technology by explaining the fundamentals of hydrobiology, aquatic ecosystems, water treatment and supply, wastewater treatment and integrated catchment management. This fourth edition is extensively changed throughout, with new coverage of the effects of climate change, environmental assessment, sustainability and the threat to biodiversity. The text serves as a primer for both undergraduate and graduate students in either science or engineering who have an interested in freshwater biology/hydrobiology or environmental engineering. It is also useful as a unified transitional course for those who want to span the traditional areas of engineering, biology, chemistry, microbiology or business. Professionals and consultants will also find the book a useful reference.

Health and Environmental Safety of Nanomaterials

Author : James Njuguna
Publisher : Woodhead Publishing
ISBN 13 : 0128205105
Total Pages : 534 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Health and Environmental Safety of Nanomaterials by : James Njuguna

Download or read book Health and Environmental Safety of Nanomaterials written by James Njuguna and published by Woodhead Publishing. This book was released on 2021-07-24 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of Health and Environmental Safety of Nanomaterials: Polymer Nanocomposites and Other Materials Containing Nanoparticles was published in 2014, but since that time, new developments in the field of nanomaterials safety have emerged, both at release and exposure, along with the expanding applications of the nanomaterials side. Numerous studies have been dedicated to the issue of biophysical interactions of nanoparticles with the human body at the organ, cellular, and molecular levels. In this second edition, all the chapters have been brought fully up to date. There are also four brand new chapters on the biophysical interaction of nanoparticles with the human body; advanced modeling approaches to help elucidate the nanorisks; safety measures at work with nanoparticles; and the health and environmental risks of graphene. It provides key knowledge and information needs for all those who are working in the research and development sector and need to learn more about the safety of nanomaterials. • Focuses on the health and safety of polymer nanocomposites and other materials containing nanoparticles, as well as their medical and environmental implications • Discusses the fundamental nature of various biophysical interactions of nanoparticles with the human body • Looks at the physico-chemistry of nanoparticles and their uptake, translocation, transformation, transport, and biodistribution in mammalian and plant systems • Presents the structure–activity relationships and modeling of the interactions of nanoparticles with biological molecules, biochemical pathways, analysis of biomolecular signatures, and the development of biomarkers.

Human and Ecological Risk Assessment

Author : Dennis J. Paustenbach
Publisher : John Wiley & Sons
ISBN 13 : 111974296X
Total Pages : 1319 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Human and Ecological Risk Assessment by : Dennis J. Paustenbach

Download or read book Human and Ecological Risk Assessment written by Dennis J. Paustenbach and published by John Wiley & Sons. This book was released on 2024-04-15 with total page 1319 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understand the fundamentals of human risk assessment with this introduction and reference Human risk assessments are a precondition for virtually all industrial action or environmental regulation, all the more essential in a world where chemical and environmental hazards are becoming more abundant. These documents catalog potential environmental, toxicological, ecological, or other harms resulting from a particular hazard, from chemical spills to construction projects to dangerous workplaces. They turn on a number of variables, of which the most significant is the degree of human exposure to the hazardous agent or process. Human and Ecological Risk Assessment combines the virtues of a textbook and reference work to introduce and analyze these vital documents. Beginning with the foundational theory of human health risk assessment, it then supplies case studies and detailed analysis illustrating the practice of producing risk assessment documents. Fully updated and authored by leading authorities in the field, the result is an indispensable work. Readers of the second edition of Human and Ecological Risk Assessment will also find: Over 40 entirely new case studies reflecting the latest in risk assessment practice Detailed discussion of hazards including air emissions, contaminated food and soil, hazardous waste sites, and many more Case studies from multiple countries to reflect diverse international standards Human and Ecological Risk Assessment is ideal for professionals and advanced graduate students in toxicology, industrial hygiene, occupational medicine, environmental science, and all related subjects.

Immobilised Biocatalysts for Bioremediation of Groundwater and Wastewater

Author : Rita Hochstrat
Publisher : IWA Publishing
ISBN 13 : 1780406452
Total Pages : 178 pages
Book Rating : 4.7/5 (84 download)

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Book Synopsis Immobilised Biocatalysts for Bioremediation of Groundwater and Wastewater by : Rita Hochstrat

Download or read book Immobilised Biocatalysts for Bioremediation of Groundwater and Wastewater written by Rita Hochstrat and published by IWA Publishing. This book was released on 2015-02-15 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: The European project MINOTAURUS explored innovative bio-processes to eliminate emerging and classic organic pollutants. These bio-processes are all based on the concept of immobilization of biocatalysts (microorganisms and enzymes) and encompass bioaugmentation, enzyme technology, rhizoremediation with halophytes, and a bioelectrochemical remediation process. The immobilization-based technologies are applied as engineered ex situ treatment systems as well as natural systems in situ for the bioremediation of groundwater, wastewater and soil. The selection and application of tailored physico-chemical, molecularbiological and ecotoxicological monitoring tools combined with a rational understanding of engineering, enzymology and microbial physiology is a pertinent approach to open the black-box of the selected technologies. Reliable process monitoring constitutes the basis for developing and refining biodegradation kinetics models, which in turn improve the predictability of performances to be achieved with technologies. Immobilised Biocatalysts for Bioremediation of Groundwater and Wastewater delivers insight into the concepts and performance of a series of remediation approaches. A key strength of this book is to deliver results from lab-scale through to piloting at different European reference sites. It further suggests frameworks for structuring and making evidence-based decisions for the most appropriate bioremediation measures.

Environmental Risk Analysis for Asian-Oriented, Risk-Based Watershed Management

Author : Minoru Yoneda
Publisher : Springer
ISBN 13 : 9811080909
Total Pages : 195 pages
Book Rating : 4.8/5 (11 download)

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Book Synopsis Environmental Risk Analysis for Asian-Oriented, Risk-Based Watershed Management by : Minoru Yoneda

Download or read book Environmental Risk Analysis for Asian-Oriented, Risk-Based Watershed Management written by Minoru Yoneda and published by Springer. This book was released on 2018-05-07 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is a practical guidebook on environmental risk assessment, especially for watershed-scale management. It highlights case studies of watershed environmental risk in Malaysia, including the potential health risks as well as screening methods and management in practice. In order to apply environmental risk assessment methods for the management of toxic chemicals, it is necessary to consider the geological and climate features of each country as well as their cultural characteristics. Focusing on Malaysia as a representative country, the book also discusses studies in other Asian countries. The insights provided can be applied to advanced and developing countries alike. A suitable textbook for graduate students, it is also a valuable reference source for researchers, practitioners and policymakers.

Ecological Effects Test Guidelines

Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (468 download)

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Book Synopsis Ecological Effects Test Guidelines by :

Download or read book Ecological Effects Test Guidelines written by and published by . This book was released on 1996 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Introduction to Toxicological Screening Methods and Good Laboratory Practice

Author : Saravana Babu Chidambaram
Publisher : Springer Nature
ISBN 13 : 9811660921
Total Pages : 205 pages
Book Rating : 4.8/5 (116 download)

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Book Synopsis Introduction to Toxicological Screening Methods and Good Laboratory Practice by : Saravana Babu Chidambaram

Download or read book Introduction to Toxicological Screening Methods and Good Laboratory Practice written by Saravana Babu Chidambaram and published by Springer Nature. This book was released on 2022-02-11 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the principles, methods, and interpretation involved in establishing the safety, risk, and hazard assessment of small molecules. It presents the regulatory requirements for risk and hazard identification as per the guidelines of the Organization for Economic Cooperation and Development (OECD), Paris, and the International Council for Harmonisation (ICH) of Technical Requirements for Pharmaceuticals for Human Use ICH and Schedule ‘Y’, India. It serves as reference material for undergraduate and postgraduate pharmacy degree students as well as senior researchers to learn about the principles, methods, and interpretations of systemic dosage (acute and repeated dose) and genotoxicity (in vitro and in vivo), special toxicological investigations such as reproductive and developmental toxicology, carcinogenicity, and toxicokinetics using animal models or in vitro methods, as applicable. This book is the first of its kind in providing information on the principles and methods of implementation of Good Laboratory Practice based on the guidelines of OECD. It includes detailed chapters about the regulatory requirements and guidelines in pharmaceutical products and agrochemicals. It also describes the infrastructure needed for preclinical studies, including in vivo and in vitro facilities.

Synthetics, Mineral Oils, and Bio-Based Lubricants

Author : Leslie R. Rudnick
Publisher : CRC Press
ISBN 13 : 1351655736
Total Pages : 1770 pages
Book Rating : 4.3/5 (516 download)

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Book Synopsis Synthetics, Mineral Oils, and Bio-Based Lubricants by : Leslie R. Rudnick

Download or read book Synthetics, Mineral Oils, and Bio-Based Lubricants written by Leslie R. Rudnick and published by CRC Press. This book was released on 2020-01-29 with total page 1770 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highlighting the major economic and industrial changes in the lubrication industry since the first edition, Synthetics, Mineral Oils, and Bio-Based Lubricants: Chemistry and Technology, Third Edition highlights the major economic and industrial changes in the lubrication industry and outlines the state of the art in each major lubricant application area. Chapters cover the use of lubricant fluids, growth or decline of market areas and applications, potential new applications, production capacities, and regulatory issues, including biodegradability, toxicity, and food production equipment lubrication. The highly-anticipated third edition features new and updated chapters including those on automatic and continuously variable transmission fluids, fluids for food-grade applications, oil-soluble polyalkylene glycols, functional bio-based lubricant base stocks, farnesene-derived polyolefins, estolides, bio-based lubricants from soybean oil, and trends in construction equipment lubrication. Features include: Contains an index of terms, acronyms, and analytical testing methods. Presents the latest conventions for describing upgraded mineral oil base fluids. Considers all the major lubrication areas: engine oils, industrial lubricants, food-grade applications, greases, and space-age applications Includes individual chapters on lubricant applications—such as environmentally friendly, disk drive, and magnetizable fluids—for major market areas around the globe. In a single, unique volume, Synthetics, Mineral Oils, and Bio-Based Lubricants: Chemistry and Technology, Third Edition offers property and performance information of fluids, theoretical and practical background to their current applications, and strong indicators for global market trends that will influence the industry for years to come.

Nitrification and Denitrification in the Activated Sludge Process

Author : Michael H. Gerardi
Publisher : John Wiley & Sons
ISBN 13 : 0471461318
Total Pages : 207 pages
Book Rating : 4.4/5 (714 download)

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Book Synopsis Nitrification and Denitrification in the Activated Sludge Process by : Michael H. Gerardi

Download or read book Nitrification and Denitrification in the Activated Sludge Process written by Michael H. Gerardi and published by John Wiley & Sons. This book was released on 2003-03-19 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrification and Denitrification in the Activated Sludge Process, the first in a series on the microbiology of wastewater treatment, comprises the critical topics of cost-effective operation, permit compliance, process control, and troubleshooting in wastewater treatment plants. Avoiding the technical jargon, chemical equations, and kinetics that typically accompany such texts, Nitrification and Denitrification in the Activated Sludge Process directly addresses plant operators and technicians, providing necessary information for understanding the microbiology and biological conditions that occur in the treatment process. Of special interest to wastewater treatment plant operators are the bacteria that degrade nitrogenous wastes–the nitrifying bacteria–and the bacteria that degrade carbonaceous wastes–the cBOD-removing bacteria. Both groups of bacteria need to be routinely monitored and operational conditions favorably adjusted to ensure desired nitrification. Each chapter in this groundbreaking study offers a better understanding of the importance of nitrification and denitrification and the bacteria involved in these crucial processes. Chapters include: Organotrophs The Wastewater Nitrogen Cycle Nitrite Ion Accumulation Dissolved Oxygen Denitrifying Bacteria Gaseous End Products Free Molecular Oxygen The Occurrence of Denitrification