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Coagulant recovery and reuse from waterworks sludge has the potential to significantly reduce waste disposal and chemicals usage for water treatment. Drinking water regulations demand purification of recovered coagulant before they can be safely reused, due to the risk of disinfection by-product precursors being recovered from waterworks sludge alongside coagulant metals.
Roughly seventy percent of the total reuse water in Spain is dedicated to irrigation and the main treatment adopted to achieve the adequate quality for this use, according to current wastewater reuse regulation, consisting of a chemical coagulation and precipitation, granular filtration, and disinfection with ultraviolet (UV), chlorine or a combination of both.
