edited hari mohan singh (3 risultati)

Contents Preface 1 Industrial wastewater treatment 2 Sewage treatment 3 Water pollution 4 Marine debris 5 Oil spill and watershed central agency 6 Industrial distillation 7 Electrocoagulation and electrolysis 8 Storm water and water treatment 9 Water purification 10 Aerobic treatment system 11 Septic system and composting toilet IndexWaste water treatment is the process of removing contaminants from waste water and household sewage both runoff effluents and domestic It includes physical chemical and biological processes to remove physical chemical and biological contaminants Its objective is to produce a waste stream or treated effluent and a solid waste or sludge suitable for discharge or reuse back into the environment This material is often inadvertently contaminated with many toxic organic and inorganic compounds Industrial waste water treatment covers the mechanisms and processes used to treat water that have been contaminated in some way by anthropogenic industrial or commercial activities prior to its release into the environment or its reuse Most industries produce some wet waste although recent trends in the developed world have been to minimize such production or recycle such waste within the production process However many industries remain dependent on processes that produce waste water The industrial and domestic sector consumes significant volumes of water and consequently generates considerable amounts of waste water treatment is becoming more important due to diminishing water resources increasing waste water disposal costs and stricter discharge regulations that have lowered permissible contaminant levels in waste streamsThis book deals with the various methods and technologies currently used in wastewater treatment with emphasis on industrial and domestic wastewater  288 pp.

Contents Preface 1 Nuclear power reactor 2 Nuclear and radiation accidents 3 Hazardous waste 4 Nuclear safety 5 Radioactive waste 6 Radioactive decay and nuclear fusion 7 Nuclear waste policy act 8 Integral fast reactor 9 Low and high level waste 10 Pollution and environment 11 Radioactive scrap metal 12 Yucca mountain nuclear waste repository 13 Depleted uranium waste 14 Environmental remediation 15 Biogas and gasification Index"Thousands of small scale and even some bigger industrial units simply dump their waste more often toxic and hazardous in open spaces and nearby water sources Over the last three decades many cases of serious and permanent damage to environment by these industries have come to the foreNuclear and industrial waste management has a lot of concern It involves the collection transport processing recycling andor disposal of waste materials It is basically carried out in order to reduce the effect of waste in the environment If its left unattended it can be hazardous to life human beings Nuclear waste can be dangerous Radioactive products nuclear byproducts resulting from use in modern medicine and products such as uranium and plutonium are a concern Responsible management of these products is crucial to environmental safety and the safety of residents Nuclear wastes toxicity has a shelf life and an expiration date In managing nuclear waste some products are buried in sealed containers for either long term or short-term storage Other products go through a process of transmutation Transmutation takes the nuclear waste and transforms it into a less harmful product or to a product with a shorter shelf life All in all most countries through careful processes are very responsible about nuclear waste disposalFinal disposal of high-level waste is delayed for 40-50 years to allow its radioactivity to decay after which less an one thousandth of its initial radioactivity remains and it is much easier to handle Hence canisters of vitrified waste or used fuel assemblies are stored under water in special ponds or in dry concrete structures or casks for at least this length of timeNuclear power is the only energy industry which takes full responsibility for all its wastes and adds costs this into the product In all industries the thermal generation of electricity produces wastes Whatever fuel is used these wastes must be managed in ways which safeguard human health and minimise their impact on the environment" jacket 288 pp.

Contents Preface 1 Composting and uses 2 Biodegradable polythene and plastic 2 Bioplastic and plastic recycling 3 Soil steaming and incineration Cremation and gasification 4 Plasma and electric arc waste disposal 5 Pyrolysis - a chemical decomposition 6 Ecological sanitation 7 Landfill and land reclamation 8 Global warming 9 Waste management and recycling 10 Biodiversity and chemetco IndexSolid waste has become a problem for many urban cities and an actual crisis for some Civic agencies that pick up waste and deliver it to landfill sites may also help in the solid waste management process Managing the solid waste is an extensive process Since we have lived in a throwaway society for several generations since the industrial revolution our planet has paid the priceWaste materials that are organic in nature such as plant material food scraps and paper products can be recycled using biological composting and digestion processes to decompose the organic matter The resulting organic material is then recycled as mulch or compost for agricultural or landscaping purposes In addition waste gas from the process such as methane can be captured and used for generating electricity The intention of biological processing in waste management is to control and accelerate the natural process of decomposition of organic matterThere are a large variety of composting and digestion methods and technologies varying in complexity from simple home compost heaps to industrial scale enclosed vessel digestion of mixed domestic waste Methods of biological decomposition are differentiated as being aerobic or anaerobic methods though hybrids of the two methods also exist 272 pp.