Download or read book Biodegradability of Surfactants written by D.R. Karsa and published by Springer Science & Business Media. This book was released on 1994-12-31 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: The awareness and development of 'biodegradable' surfactants pre-dates current pressures by the environmental movement by nearly three decades, wherein a responsible industry mutually agreed to replace 'hard', non-biodegradable com ponents of household detergents by 'soft', biodegradable alternatives, without course to legislation. The only requirement at that time was for surfactants used in detergents to exhibit a 'primary biodegradability' in excess of 80%; this referring to the disap pearance or removal from solution of the intact surface active material as de tected by specified analytical techniques. This proved useful, as observed environmental impacts of surfactants, e.g. visible foam on rivers, are associated with the intact molecule. Test methods for 'primary biodegradability' were eventually enshrined in EU legislation for nonionic surfactants (Directive 821242/EEC, amended 73/404IEEC) and for anionic surfactants (Directive 8212431EEC, amended 73/405IEEC). No approved test methods and resultant legislation have been developed for cationic and amphoteric surfactants to date. The environmental classification of chemical substances, which of course includes surfactants, and associated risk assessment utilises a second criterion 'ready biodegradability'. This may be assessed by a number of methods which monitor oxygen uptake (BOD), carbon dioxide production or removal of dis solved organic carbon (DOC). Some surfactants which comply with the above Detergents Directive are borderline when it comes to 'ready biodegradability'.
Download or read book Surfactant Biodegradation Second Edition written by Robert Donald Swisher and published by CRC Press. This book was released on 1986-10-31 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biodegradation written by Rolando Chamy and published by BoD – Books on Demand. This book was released on 2013-06-14 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a collection of different biodegradation research activities where biological processes take place. The book has two main sections: A) Polymers and Surfactants Biodegradation and B) Biodegradation: Microbial Behaviour.
Download or read book Biodegradability of Surfactants written by D.R. Karsa and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: The awareness and development of 'biodegradable' surfactants pre-dates current pressures by the environmental movement by nearly three decades, wherein a responsible industry mutually agreed to replace 'hard', non-biodegradable com ponents of household detergents by 'soft', biodegradable alternatives, without course to legislation. The only requirement at that time was for surfactants used in detergents to exhibit a 'primary biodegradability' in excess of 80%; this referring to the disap pearance or removal from solution of the intact surface active material as de tected by specified analytical techniques. This proved useful, as observed environmental impacts of surfactants, e.g. visible foam on rivers, are associated with the intact molecule. Test methods for 'primary biodegradability' were eventually enshrined in EU legislation for nonionic surfactants (Directive 821242/EEC, amended 73/404IEEC) and for anionic surfactants (Directive 8212431EEC, amended 73/405IEEC). No approved test methods and resultant legislation have been developed for cationic and amphoteric surfactants to date. The environmental classification of chemical substances, which of course includes surfactants, and associated risk assessment utilises a second criterion 'ready biodegradability'. This may be assessed by a number of methods which monitor oxygen uptake (BOD), carbon dioxide production or removal of dis solved organic carbon (DOC). Some surfactants which comply with the above Detergents Directive are borderline when it comes to 'ready biodegradability'.
Download or read book Surfactant Science and Technology written by Drew Myers and published by John Wiley & Sons. This book was released on 2020-08-04 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: A solid introduction to the field of surfactant science, this new edition provides updated information about surfactant uses, structures, and preparation, as well as seven new chapters expanding on technology applications. Offers a comprehensive introduction and reference of the science and technology of surface active materials Elaborates, more fully than prior editions, aspects of surfactant crystal structure as well as their effects on applications Adds more information on new classes and applications of natural surfactants in light of environmental consequences of surfactant use
Download or read book Surfactant Biodegradation written by Robert Donald Swisher and published by . This book was released on 1970 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Biodegradable Materials written by Gomaa A. M. Ali and published by Springer Nature. This book was released on 2023-02-20 with total page 1704 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Handbook discusses the recent advances in biodegradation technologies and highlights emerging sustainable materials, including environmentally friendly nano-based materials for replacing plastics. It is useful to scientists, engineers, biologists, medical doctors and provides alternative eco-friendly materials to replace the currently used ones with harmful impact on the environment and life. The chapters present different types of alternative materials in diverse areas, such as food packaging materials, materials for construction and agricultural materials. The principles and types of biodegration technologies are described in depth.
Download or read book Encyclopedia of Surface and Colloid Science written by P. Somasundaran and published by CRC Press. This book was released on 2006 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Bioremediation written by Yogesh Patil and published by BoD – Books on Demand. This book was released on 2013-10-02 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioremediation technologies are gaining immense credibility in the field of waste management because of their eco-compatibility nature. Biomass can interact and confront with water and soil pollutants in both active (live) as well as passive (dead) way, thereby offering numerous opportunities of exploring them for environmental clean-up. In 21st century, wastes are no longer a waste but are recognized as a valuable Resource. Employing novel and integrated strategies for the development of modern bioremediation processes is desperate need of the hour. This edited book on Applied Bioremediation - Active and Passive Approaches contains mix of interesting chapters that will certainly add to the advancement of knowledge and will provide the required valuable resource and stimulus to the researchers worldwide.
Download or read book Preservation of Surfactant Formulations written by F. Morpeth and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbes are known to live in an enormous range of environments. Their ability to survive and proliferate in diverse industrial systems is often a surprise to those not exposed to these problems in their work. These systems contain a range of potential carbon sources, one common theme being surfactants. Surfactants are often not the components most prone to spoilage since some systems contain highly susceptible natural components, such as starch and xanthum gum, but the surfactant is a key part of the formulation, and its extensive breakdown usually means that the material is beyond recovery. The aim of this book is to describe in detail all aspects of the preservation of surfactant containing materials. The book should be viewed as being in three discrete sections. • chapters 1-5 deal with and summarise essential background information • chapters 6-11 discuss in detail various end use applications • chapters 12-15 outline the regulatory and toxicology implication associated with the safe handling of preservatives Given the format of the book there is inevitably some duplication of information in the middle section with different authors describing essentially the same phenomena but on different substrates. I hope the reader will find that although different chapters touch on the same topics the information around these areas is sufficiently different to justify their inclusion in this book and to be of interest. It should also demonstrate what can be the most useful source of information, the hard practical experience of the authors.
Download or read book Anionic Surfactants written by Helmut W. Stache and published by CRC Press. This book was released on 1995-09-13 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a comprehensive survey of important anionic surfactants. It delineates current manufacturing technologies, methods of analysis, practical applications, environmental behaviour and the physicochemical and toxicological properties of surfactants and their related by-products. The uses of anionic surfactants in the cleaning, cosmetic, textile, leather, food, petroleum, metalworking and paper industries, are encompassed.
Download or read book Encyclopedia of Surface and Colloid Science written by Arthur T. Hubbard and published by CRC Press. This book was released on 2002-07-18 with total page 1580 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive reference collects fundamental theories and recent research from a wide range of fields including biology, biochemistry, physics, applied mathematics, and computer, materials, surface, and colloid science-providing key references, tools, and analytical techniques for practical applications in industrial, agricultural, and forensic processes, as well as in the production of natural and synthetic compounds such as foods, minerals, paints, proteins, pharmaceuticals, polymers, and soaps.
Download or read book Solution Behavior of Surfactants written by K.L. Mittal and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 747 pages. Available in PDF, EPUB and Kindle. Book excerpt: This and its companion Volume 2 comprise the proceedings of the International Symposium on "Solution Behavior of Surfactants - Theoretical and Applied Aspects" organized under the auspices of the 11th Northeast Regional Meeting of the American Chemical Soci ety held in Potsdam, N. Y. , June 30-July 3, 1980. This Symposium re presented the third event in the series of symposia dealing with the topic of surfactants in solution. The first Symposium was held in Albany, N. Y. , in 1976 under the title "Micellization, Solubili zation and Microemulsions", 1 the proceedings of which have been doc umented in a two-volume set • The second was held under the title "~olution Chemistry of Surfactants" in 1978 in Knoxville, TN, an~ the proceedings of this event have also been properly chronicled • Apropos, the fourth biennial Symposium in, this series is entitled "International Symposium on Surfactants in Solution" (K. L. Mittal and B. Lindman, Cochairmen) and is scheduled to be held from June 27 to July 2, 1982 in Lund, Sweden. Since these biennial events have been very successful and important in bringing researchers with varied interests together and in stimulating interdisciplinary communication, so the plans are to continue these on a regular basis with a change in venue for each meeting.
Download or read book Environmental and Human Safety of Major Surfactants written by Sylvia S. Talmage and published by CRC Press. This book was released on 2020-04-08 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book summarizes and reviews the environmental and human safety of two classes of nonionic surfactants-alcohol ethoxylates (AE) and alkylphenol ethoxylates (APE). This unique resource contains critical data from published sources as well as from unpublished studies submitted by Soap and Detergent Association member companies. It reviews information on product chemistry and analysis, biodegradation, environmental levels (including fate and distribution), aquatic toxicity, and human safety. Recently developed analytical techniques for the extraction, separation, detection, and measurement of nonionic surfactants and their metabolites in environmental samples are described. Results of biodegradation studies performed with a variety of test systems are tabulated, as are results of field studies at wastewater treatment plants. Reported comparisons of environmental levels with results of acute and chronic aquatic toxicity tests are provided. The information on the toxicity and irritation potential of AE and APE surfactants includes data from in vitro, mammalian, and human studies.
Download or read book Biochemistry of microbial degradation written by Colin Ratledge and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: Life on the planet depends on microbial activity. The recycling of carbon, nitrogen, sulphur, oxygen, phosphate and all the other elements that constitute living matter are continuously in flux: microorganisms participate in key steps in these processes and without them life would cease within a few short years. The comparatively recent advent of man-made chemicals has now challenged the environment: where degradation does not occur, accumulation must perforce take place. Surprisingly though, even the most recalcitrant of molecules are gradually broken down and very few materials are truly impervious to microbial attack. Microorganisms, by their rapid growth rates, have the most rapid turn-over of their DNA of all living cells. Consequently they can evolve altered genes and therefore produce novel enzymes for handling "foreign" compounds - the xenobiotics - in a manner not seen with such effect in other organisms. Evolution, with the production of micro-organisms able to degrade molecules hitherto intractable to breakdown, is therefore a continuing event. Now, through the agency of genetic manipulation, it is possible to accelerate this process of natural evolution in a very directed manner. The time-scale before a new microorganism emerges that can utilize a recalcitrant molecule has now been considerably shortened by the application of well-understood genetic principles into microbiology. However, before these principles can be successfully used, it is essential that we understand the mechanism by which molecules are degraded, otherwise we shall not know where best to direct these efforts.
Download or read book Reactions And Synthesis In Surfactant Systems written by John Texter and published by CRC Press. This book was released on 2001-06-26 with total page 927 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work offers a comprehensive review of surfactant systems in organic, inorganic, colloidal, surface, and materials chemistry. It provides practical applications to reaction chemistry, organic and inorganic particle formation, synthesis and processing, molecular recognition and surfactant templating. It also allows closer collaboration between synthetic and physical practitioners in developing new materials and devices.
Download or read book Bacterial Biodegradation of Polycyclic Aromatic Hydrocarbons PAH and Potential Effects of Surfactants on PAH Bioavailability written by and published by . This book was released on 1996 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
