- Shot blasts used in surface polishing and cleaning steel products undergo changes in shape and often become contaminated with sand, making them unsuitable for reuse in certain processes.- XRD analysis was used to characterize the used shot blasts, revealing the presence of predominantly iron in the Fe0 form, along with trace elements such as Si and Al.- The high iron content of the used shot blasts played a significant role in the degradation of organic pollutants during wastewater treatment in the modified air-Fenton system.