This book provides detailed description of methods for the treatment of domestic and industrial waste waters and safe disposal of solid wastes including hazardous and bio-medical wastes. Global environmental issues like air pollution, ozone depletion, global warming and acid rains have also been discussed along with Noise pollution. The text matter has further been supported by about 600 Objective Questions and Numerical Questions from various competitive exams, making the book highly useful for all the students of Civil, Environmental and Chemical engineering courses, and for those preparing for the various competitive and AMIE examinations.