Download or read book Traitabilit des rejets liquides de l industrie textile written by Asma Alinsafi and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Le coût de la dégradation de l'environnement au Maroc représente annuellement 20 milliards de dirhams soit 8,2% du PIB national. 14,5 milliards de dirhams sont dus à l'eau et aux déchets. Cet état s'aggrave de plus en plus par le rejet direct d'eaux industrielles dans le milieu naturel, qui constituent une importante pollution organique et toxique. Dans ce contexte de protection de l'environnement nous avons réalisé une étude de traitabilité de rejets liquides de l'industrie textile. Nous avons effectué en premier lieu une caractérisation physico-chimique de ces rejets en se focalisant sur l'aspect de la couleur, de la toxicité (étudiée ici par des tests de respirométrie) et sur l'effet de la variabilité de ce type de rejet sur le fonctionnement et la stabilité d'un système de traitement biologique par boues activées. En deuxième lieu, nous avons réalisé des tests de traitabilité par les procédés de coagulation, d'électrocoagulation et de photocatalyse afin d'abattre la couleur et augmenter la biodégradabilité des eaux. En dernier lieu, nous avons couplé le prétraitement à un traitement biologique par réacteur discontinu séquentiel afin de se situer par rapport aux normes de rejet des eaux dans le milieu naturel. Le choix se fait dans un esprit de développement durable c'est-à-dire en examinant les impacts de consommation en énergie et en réactifs, et en s'assurant de la robustesse du procédé par rapport à la variabilité des rejets. Ce travail a pour but essentiellement de concevoir les bases techniques qui pourront être incluses ultérieurement dans un outil d'aide à la décision sur le choix d'une technologie de traitement des rejets liquides avec une éventuelle ré-utilisation sur site de l'eau traitée.
Download or read book Traitabilit biologique des effluents d une usine d ennoblissement des tissus written by Zaloum, Ronald and published by Environnement Canada. This book was released on 1987 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book valuation de la traitabilit d un m lange d eaux us es comportant une forte proportion d effluents de l industrie textile written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book valuation de la traitabilit d un m lange d eaux us es comportant une forte proportion d effluents de l industrie textile written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arsenic in Drinking Water written by National Research Council and published by National Academies Press. This book was released on 2001-11-26 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Having safe drinking water is important to all Americans. The Environmental Protection Agency's decision in the summer of 2001 to delay implementing a new, more stringent standard for the maximum allowable level for arsenic in drinking water generated a great deal of criticism and controversy. Ultimately at issue were newer data on arsenic beyond those that had been examined in a 1999 National Research Council report. EPA asked the National Research Council for an evaluation of the new data available. The committee's analyses and conclusions are presented in Arsenic in Drinking Water: 2001 Update. New epidemiological studies are critically evaluated, as are new experimental data that provide information on how and at what level arsenic in drinking water can lead to cancer. The report's findings are consistent with those of the 1999 report that found high risks of cancer at the previous federal standard of 50 parts per billion. In fact, the new report concludes that men and women who consume water containing 3 parts per billion of arsenic daily have about a 1 in 1,000 increased risk of developing bladder or lung cancer during their lifetime.
Download or read book Total Diet Studies written by Gerald G. Moy and published by Springer. This book was released on 2016-08-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unless a food is grossly contaminated, consumers are unable to detect through sight or smell the presence of low levels of toxic chemicals in their foods. Furthermore, the toxic effects of exposure to low levels of chemicals are often manifested slowly, sometimes for decades, as in the case of cancer or organ failure. As a result, safeguarding food from such hazards requires the constant monitoring of the food supply using sophisticated laboratory analysis. While the food industry bears the primary responsibility for assuring the safety of its products, the overall protection of people’s diets from chemical hazards must be considered one of the most important public health functions of any government. Unfortunately, many countries do not have sufficient capability and capacity to monitor the exposure of their populations to many potentially toxic chemicals that could be present in food and drinking water. Without such monitoring, public health authorities in many countries are not able to identify and respond to problems posed by toxic chemicals, which may harm their population and undermine consumer confidence in the safety of the food supply. From a trade perspective, those countries that cannot demonstrate that the food they produce is free of potentially hazardous chemicals will be greatly disadvantaged or even subject to sanctions in the international marketplace. The goal of a total diet study (TDS) is to provide basic information on the levels and trends of exposure to chemicals in foods as consumed by the population. In other words, foods are processed and prepared as typical for a country before they are analyzed in order to better represent actual dietary intakes. Total diet studies have been used to assess the safe use of agricultural chemicals (e.g., pesticides, antibiotics), food additives (e.g., preservatives, sweetening agents), environmental contaminants (e.g., lead, mercury, arsenic, cadmium, PCBs, dioxins), processing contaminants (e.g., acrylamide, polycyclic aromatic hydrocarbons, chloropropanols), and natural contaminants (e.g., aflatoxin, patulin, other mycotoxins) by determining whether dietary exposure to these chemicals are within acceptable limits. Total diet studies can also be applied to certain nutrients where the goal is to assure intakes are not only below safe upper limits, but also above levels deemed necessary to maintain good health. International and national organizations, such as the World Health Organization, the European Food Safety Agency and the US Food and Drug Administration recognize the TDS approach as one of the most cost-effective means of protecting consumers from chemicals in food, for providing essential information for managing food safety, including food standards, and for setting priorities for further investment and study. Total Diet Studies introduces the TDS concept to a wider audience and presents the various steps in the planning and implementation of a TDS. It illustrates how TDSs are being used to protect public health from chemicals in the food supply in many developed and developing countries. The book also examines some of the applications of TDSs to specific chemicals, including contaminants and nutrients.
