Rivers are fundamental for ecosystem, also harbor the cradle of cultures and development streams. But water pollution is one of the most serious global problems; acid rain, wastewater discharges, agricultural chemicals, heavy metals ... are incorporated into the flow of rivers. The problem is acute worldwide by the quantity and diversity of polluting agents, and / or the impossibility of purification and regeneration of wastewater. However, contemporary societies depends on the chemical products (food or chemical industries or daily life facilities). Many of these products are toxic (especially processing byproducts). Discharge into surface water may cause irreversible consequences.