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Water recycling is former wastewater (sewage) that has been treated to remove solids and certain impurities, and then used in sustainable landscaping irrigation or to recharge groundwater aquifers. This is done for sustainability and water conservation, rather than discharge the treated wastewater to surface waters such as rivers and oceans. Water management is the activity of planning, developing, distributing, managing, an optimum use of water resources defined under water polices and regulations. This book presents topical research data in the study of water recycling and management, including runoff water harvesting for agricultural production in semiarid zones; water disinfection using peracetic acid; wastewater reuse and recycling in sub-Saharan Africa; Australia's water recycling system; as well as the water and international trade law.