#TITLE_ALTERNATIVE#

• Main Author: MADE DWI SASTRIANI (NIM : 15312018), NI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29649
• Institution: Institut Teknologi Bandung

The development of aerobic granular sludge has been extensively reported using a Sequencing Batch Reactor (SBR) with many variety of height to diameter ratio <br /> <br /> (H/D). The H/D ratio in the SBR reactor affects the air flow velocity or superficial up flow air velocity (SUAV) which in turn will affects the hydrodynamic shear <br /> <br /> forces in the reactor. The higher the hydrodynamic shear force, then the granulation process will produce granules with more solid and compact structure. Thus, this study aimed to observe the effect of H/D ratio variation in the aerobic granulation. This research was conducted by using four variations of H/D ratio on the dimensions of SBR with the same working volume, which was 2.4 L. The variation of the H/D ratio in this research is 4, 6, 9 and 14. At the aeration rate of 3 L/min, the values of SUAV in a row from the lowest H/D ratio were 0.786 cm/sec, 0.995 cm/sec, 1.299 cm/sec and 1.768 cm/sec. The results showed that the <br /> <br /> H/D ratio affects the formation of aerobic granular, which the higher the H/D ratio produced better setting capability of aerobic granular. It was showed by physical characteristic of granule including the value of Sludge Volume Index (SVI), Sludge Density Index (SDI) and settling velocity. The SDI of each reactor was increasing as the increased of H/D ratio. The optimum SDI values for H/D ratio of 4 was 1.99 gram/mL, H/D ratio of 6 was 2.07 gram/mL, H/D ratio of 9 was 2.09 gram/mL and H/D ratio of 14 was 2.19 gram/mL. The increased of SDI further effect on the decreased of SVI and the increased of aerobic granular settling velocity. The formation of aerobic granular on the high H/D ratio also inclined to have a smaller size with a high aspect ratio approximately equal to 1, so that the granular had more stable shape and structure. The average diameters of granular on the four reactors in series start from the lowest H/D ratio were <br /> <br /> 2.118 mm, 2.112 mm, 2.068 mm and 2.023 mm. Besides the effect on the physical characteristics of aerobic granular, the H/D ratio variations also affect the optimum time attainment of granulation in each reactor, which the reactor with higher H/D ratio had achieved optimum conditions faster. Based on those results, it can be concluded that the higher the H/D ratio will be more effective for the aerobic granular formation. Furthermore, the value of the optimum H/D ratio in this study is the H/D ratio of 14.