Saleh Al Arni is Assistant Professor, Chemical Engineering Department, Hail University, (UOH), Kingdom of Saudi Arabia. He received the Master degree (Laurea) in Chemical Engineering from Faculty of Engineering, University of Genoa (Italy), in January 1996. He is specialized in field of “Technological Application of Fermentation Processes”. In February 2000, he received the first Ph.D. degree in “Technologies and Economic of the Processes and Products to Safeguard the Environment”, from Catania University (Italy), and in April 2008, he received the second Ph.D. degree in “Chemical Sciences, Technologies and Processes”, from Genoa University (Italy). Dr. Mahmoud M. Elwaheidi holds a Ph.D. degree in Environmental & Engineering Geophysics from the University of Genova – Italy (1994). He is currently an assistant professor at the Department of Geology & Geophysics - King Saud University, in Riyadh, KSA. Dr. Elwaheidi has more than 20 years of professional and academic experience in the fields of applied geosciences. He is interested in research topics that address environmental and engineering issues. He published several scientific publications in ISI journals and acts as a reviewer and board member of several specialized ones. Dr. Elwaheidi is also a scientific translator certified by several UN agencies that deal with natural resources and environmental issues.

• 1 General Concept of Waste Management 2 Waste Impact on Health and Environment 3 Waste Related Laws, Regulations and Standards 4 Classification of Waste Materials 5 Waste Management Hierarchy 6 Solid Waste Management 7 Waste Treatment Processes 8 Biowaste Solid Materials Treatment 9 Waste Disposal by Thermal Processes 10 Industrial Wastewater Treatment 11 Effluent Gas Control: Clean- up System 12 Economics of Waste Treatment and Management

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