Pengaruh Konsentrasi Aktivator H2so4 Dan Ukuran Media Arang Sekam Padi Sebagai Adsorben Terhadap Efektivitas Penurunan Logam Berat Fe, Zn, Dan Warna Limbah Cair Industri Galvanis (Studi Kasus PT. Cerah Sempurna – Semarang)

Abstract

An industry that is growing rapidly and produces heavy metal waste water is called an industrial metal plating with zinc or also often called galvanic industry. Based on the test results in the laboratory, characteristics of industrial wastewater galvanized contains Fe of 140.84 mg/l, Zn of 66.42 mg/l and colors 10,000 mg/l PtCo (BPIK, 2014). This research aims to determine the ability of rice husk charcoal adsorbent in lowering the concentration of Fe, Zn, and color on galvanized industrial waste water is done by batch and continuous processes. Batch experiments using a variation of the activator concentration of 0.5 M sulfuric acid and 1 M for each variation of medium size of 20-35 mesh and 35-60 mesh. Fe removal efficiency of the most high at 63.02% found in variation rice husk size 20-35 mesh with H2SO4 activator concentration of 1 M. The removal efficiency were highest Zn is equal to 31.97% occurred on the variation of the size of the rice husk 35-60 mesh with H2SO4 activator concentration of 1 M. and color removal efficiency is equal to 98.76% occurred in two variations in the size of the activator concentration of H2SO4 1 M. While the continuous experiment, carried out at 1 inch diameter column with a variation of discharge 25 ml/min and 50 ml/min. Results in metal removal efficiency get total Fe, Zn and color ≥ 90% in the first 30 minutes. Rate constants k1 value of 0.03164 ml/mg.s for Fe with q0 0.661 mg/g ; then k1 0.05245 ml/mg.s for Zn with q0 of 0.35 mg/g ; and k1 0.00059 ml/mg.s for color with a capacity q0 of 10,823 mg/g at discharge of 25 ml/min. To discharge 50 ml/min rate constants k1 value 0.02985 ml/mg.s for Fe with a capacity of q0 0,964 mg/g; then k1 0.04598 ml/mg.s for Zn with q0 0.513 mg/g; and k1 0.00081 ml/mg.s for color with a capacity of q0 15,691 mg/g