STUDY PERFORMANCE OF EXISTING MULTI-STAGE UPFLOW ANAEROBIC REACTOR USING TOFU WASTEWATER

• Main Author: Sophorn, MENG
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/40511
• Institution: Institut Teknologi Bandung

A study of chemical oxygen demand (COD) removal and methane (CH4) production using tofu wastewater treatment was carried out in series of 3 upflow anaerobic fixed-bed reactors (UAF) that had previously operated but on a ceased for 3 months. The total volume of this UAF was 31.4 L with the bamboo as the supporting media. The objective of this study was to observe the performance of the existing multi-stage up-flow anaerobic fixed-bed reactor using tofu wastewater in five hydraulic retention times (HRT) totally including 2-day, 4-day, 6-day, 8-day and 10-day HRT. The longest HRT of 10 days was implemented first to allow microorganisms adapt themselves into start up process after on a ceased for 3 months. After obtaining the steady state condition, the hydraulic retention time was decreased from 10 days HRT to 2 days HRT. Tofu wastewater was use as the influent of this UAF. It had the concentration of total chemical oxygen demand (TCOD) in the range of 8091±4034 mg/L and soluble oxygen demand (SCOD) in the range of 6597±3142 mg/L. The wastewater was not neutralized and had the average pH of 4.8. Among the five HRT, the 8-day HRT was the optimum condition in organic removal efficiency with TCOD removal efficiency of 95% and SCOD of 96%. The TCOD removal efficiency of each stage was 53%, 71%, and 50% with CH4 production of 1.1 L/day, 5.1 L/day, and 1.2 L/day for R1, R2, and R3, respectively. In shortest HRT (2 days), there was VFAs accumulation which affect CH4 production. SCOD and TCOD removal obtained from a process performance studies were used to determine the kinetics coefficients using Stover-Kincannon model and first order substrate removal model. As a result of the calculations, Stover–Kincannon model was found to be the most appropriate model for this system. Kinetics parameters for HRT 8 days (optimum removal organic removal efficiency), KB and Umax of TCOD are 3.22g/L.day and 0.82 g/L.day. For SCOD, KB= 3.85g/L.day and Umax =1.76 g/L.day. KB and Umax obtained from TCOD removal of the system was 2.96 g/L.day and 3.4g/L.day, respectively while KB and Umax of SCOD was 6.85g/L.day and 7.08 g/L.day.