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The technology of handling industrial wastewater adopted by the industry is quite expensive with high costs in its operation, so that wastewater treatment technology that is cheap and easy to adopt and under strict environmental regulations is an important thing to consider. Innovative adsorption-based technology developed using industrial waste and agricultural waste offers an easy and economical solution for polluted environments. Raw grinding mill as one part of the cement industry production equipment serves to grind or soften cement raw material, some waste material which is known as reject material during the process and has not been used optimally. This research aims to determine the effect of reject material as an adsorbent on decreasing metal content and pH of industrial wastewater. The method used in processing, namely the wastewater sample, is put into a reservoir (tub I), then flowed continuously into tub II, which is filled with reject material as an adsorbent. The sampling technique was carried out after the wastewater flowed from tub II and then collected in a storage container and ready to be analyzed for heavy metal content and pH of wastewater in the laboratory. The results of the research showed that reject material of Raw Grinding Mill as an adsorbent of PT. Bosowa cement can reduce metal material PO4 = 94.63%, NO3 = 81.82%, NH3 = 22.41%, As = 76.67%, Zn = 73.23%, Ni = 100%, Ag = 60% .

Utilization of reject material in raw grinding mill unit as industrial wastewater adsorbent