The ozonation effect on flocculation and polymer consumption reduction in the hybrid treatment of Iran Central iron ore companies' effluent: a cost–benefit study

Abstract Iran's most important iron ore mine is located in the central region, and because of water shortage this area, need to reuse effluent from essential. On other hand, there are no suitable conditions for treating large volumes Iran. For reason, produced should be reduced returned consumption cycle by using appropriate technology. This study aimed investigate ozonation/lime effect on polymer reduction evaluate treatment economic efficiency compared currently used method (coagulation-flocculation without ozonation/lime). The use ozonation along with coagulation flocculation process has been an effective factor reducing all studied indicators, which a much more significant turbidity (95%), decreasing 374-350NTU non-ozonation 110-160NTU, Chemical oxygen demand (37%). In addition increasing efficiency, hybrid ozonation/coagulation operation costs. caused high-level conversion Fe 2+ Al 3+ (> 90%), thus it improved wastewater increased cost benefit. was affected improving quality sludge volume. volume or photocatalytic it. It effected micro-sized bubbles production unit. However, estimating cost–benefit can beneficial making final decision whether not.