KULTIVASI CHLORELLA VULGARIS SEBAGAI POTENSI BIOFUEL DALAM LIMBAH CAIR ARTIFISIAL UNTUK PENYISIHAN COD, NTK, DAN TOTAL FOSFAT

• Main Author: Mutia Fatimah, Adilla
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/34455
• Institution: Institut Teknologi Bandung

Previous studies reported that microalgae Chlorella vulgaris is able to grow in domestic wastewater medium. This study is aimed to analyze cellular growth and organic content of Chlorella vulgaris as well as nutrients removal efficiency from artificial wastewater characterized by Bojongsoang WWTP, with concentrations of COD 88 mg/L, NTK 11.9 mg/L and Total Phosphate 1.4 mg/L. The variants of wastewater concentration in control medium are 0%, 25%, 50%, 75% dan 100%. Batch cultivation is conducted to resemble vertical column photobioreactor with light intensity of 4500 lux, airflow of 3 lpm and constant temperature of 26-28°C. The highest cell density of 14.85 x 106 cells/mL,dry biomass of 0.1875 g/L, and organic content of 0.1385 g/L were obtained from 75% wastewater. Culture with 100% wastewater resulted in the highest cellular growth rate (?cell) of 0.85 day-1, highest biomass growth rate (?bio) of 0.35 day-,1and highest cellular organic growth rate (?org)of 0.37 day-.1 The highest percentage of lipid in biomass of 42.5% was obtained from 0%, however 75% wastewater culture resulted in the biggest overall lipid content of 0.0685 g/L. The highest NTK and total phosphate removal efficiency were obtained from 75% wastewater, with values of 77.8% and 85.4% respectively. Culture with 100% wastewater resulted in the highest COD removal efficiency of 72.7%. The addition of wastewater nutrients proved to significantly affect the cellular, biomass, and lipid growth of Chlorella vulgaris, as well as nutrient removal efficiency.