During our travel to various part of India in general, and universities, institutions, and other educational centers in particular, where environmental engineering is being taught, it was found that little emphases is given to problem solving in wastewater engineering systems. Keeping this aspect in view, the authors have tried to solve varied types of problem. The book must be read and used as a supplementary text to assist in sloving problems in wastewater engineering. About Author : Dr S.N Kaul, Director-grade Scientist, National Environmental Engineering Research Institute, Nagpur 440 020.Prof. (Dr) Arvind Kumar, Environmental Science Research Unit, Post Graduate Department of Zoology, S.K.M University, Dumka 814101, Jharkhand. Contents : PrefaceVol-IEstimation Of Water Demand And Wastewater FlowEnvironmental ChemistryConveyance, Pumps and CorrosionPreliminary TreatmentPrimary TreatmentVol -IIFundamentals of Biological TreatmentSelf-purification of StreamsSecondary Treatment (Aerobic and Anaerobic)Vol-IIINutrient RemovalTreatment And Disposal Of SludgeDisinfectionVol -IVAdvanced TreatmentWetland And Land TreatmentWaste Minimization, Recyle/Reuse, Ranking and VOCsEconomics and Statistical MethodsAppendices