Response Surface Method Application in Tofu Production Liquid Waste Treatment

Hefni Effendi (Center for Environmental Research, Bogor Agricultural University, PPLH IPB Building, Jl. Lingkar Akademik, IPB Darmaga Campus, Bogor 16680, West Java, Indonesia)
Romi Seroja (Department of Aquatic Resources Management, Bogor Agricultural University, Jl. Rasamala, IPB Darmaga Campus, Bogor 16680, West Java, Indonesia)
Sigid Hariyadi (Department of Aquatic Resources Management, Bogor Agricultural University, Jl. Rasamala, IPB Darmaga Campus, Bogor 16680, West Java, Indonesia)

Indonesian Journal of Chemistry
Vol 19, No 2 (2019)

Liquid waste of tofu production has a high content of organic matter which can lead to a decrease in water quality. This study was aimed to obtain an optimal combination of duration and waste concentration in tofu liquid waste treatment using Chrysopogon zizanioides. Response surface method using Design Expert 7.0 software was applied to optimize combination response of duration (3, 9, 15 days) and waste concentration (20, 40, 60%), aided by Design Expert 7.0 software. The optimum treatment was 15 days with 20% waste concentration, reducing 55.48% of COD, 37.86% BOD, 93.51% TSS, 87.86% Turbidity, increasing DO to 7.2 mg/L and pH to 7.2.