PEMISAHAN ION LOGAM PERAK NITRAT DARI LIMBAH CAIR PENCUCIAN FOTOGRAFI MELALUI METODE PERTUKARAN ION

Abstract

Silver is a type of heavy metal that is a pollutant to the environment to a certain extent. Ag concentrations in photographic waste can reach 1,000–10,000 mg/L. If photographic waste is discharged into the environment without special treatment, it can cause serious problems. The working method of decreasing the silver ion content (Ag + ) in the liquid waste used for photographic washing using resin with ion exchange is by contacting the liquid waste and resin. The purpose of this study was to determine the effect of resin weight in the separation of Ag + ions. This Ag + ion separation study was carried out with a resin weight variable of 125gr; 150gr; 175gr; 200gr, and 225gr and a stirring speed of 100 rpm; 150 rpm; 200 rpm, 250 rpm; and 300 rpm. Based on the results of the study, the silver (Ag + ) content in the liquid waste from photographic washing was found to be 5.711 mg/L. The highest decrease in silver ion content (Ag + ) was in the resin weight of 225gr with a stirring speed of 300 rpm, with the remaining Ag + ion content in the liquid waste from photographic washing 0.012 mg/L. The remaining Ag+ ion content in photographic waste has met the quality standard of wastewater for disposal to the environment, which is 5 mg/L.