Application of response surface methodology (rsm) for optimisation of cod removal from tofu wastewater in an adsorption process using silica adsorbent

Abstract

AbstractThe entry of pH, turbidity, COD, and TSS pollutants from tofu wastewater decreases discharge water quality and may affect the discharge water treatment process. This study aims to find variations in the mass and size of silica and the optimum adsorption time on the removal efficiency of pH, turbidity, COD, and TSS from tofu wastewater using silica adsorbent with applying surface response methodology. Chemical treatment was carried out to meet turbidity, COD, and TSS parameters. The research method used a laboratory-scale batch system with adsorbent size, mass, and adsorption time variations. From the research conducted, it obtained that the best removal for the pH test was the 100 mesh silica variation in the treatment of 3.295 gr with an adsorption time of 37 minutes; the pH value after removal was 4.87, for the turbidity test was 80 mesh silica variation in the treatment of 10 gr with an adsorption time of 15 minutes and the turbidity value after removal was 114 NTU, for the COD test, the best removal was obtained from a variation of 8.74937 gr of 104,342 mesh size silica at 39.0248 minutes of contact time with a COD value after removal of 851.33 mg/l, then for the TSS test was the 80 mesh silica variation in the treatment of 10 gr with an adsorption time of 59 minutes and the TSS value after removal was 65 mg/l.