Conservation of Natural Resources - methods, Water Purification - methods, Water pollution, Waste disposal, Chemical - prevention & control, Fluid - methods, Water Purification - instrumentation, Distillation - methods, Distillation - instrumentation, Fluid - instrumentation
Climate change, Agriculture, Science, Water resources, Hydrology, China, Irrigation, California, Water quality, desalination, Digestion, Salinity, Water treatment, Sweden, Anaerobic digestion, Reuse, Middle East, Sewage sludge, Water reuse, Anaerobic processes, Euphrates River, Baghdad Iraq, United States–US