Rapid urbanisation coupled with increasing populations has brought in new socio-economic and environmental problems in the world, particularly for third world countries. One such issue that requires urgent attention is the mounting waste problem, which has grown from being an annoyance for regional and local governments to an issue of national importance in many developing countries. Solid wastes are produced after waste-water treatment and their characteristics are influenced by anthropogenic activities. This book brings important information and results of new research with waste management in all of the world. In this volume there are contributions of experts from different countries. Each one of them shows interesting views about this fascinating and important subject.