INFLUENCE OF AIRLIFT REACTOR TOP CLEARANCE HEIGHT ON AEROBIC GRANULATION
Conventional active sludge is the technology that is used commonly in wastewater treatment. However, this technology has the disadvantage, its relatively low settling speed causing a large land requirement. One technology that can be used to overcome this deficiency is aerobic granular. In this stud...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/31739 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Conventional active sludge is the technology that is used commonly in wastewater treatment. However, this technology has the disadvantage, its relatively low settling speed causing a large land requirement. One technology that can be used to overcome this deficiency is aerobic granular. In this study aerobic granular is formed in a continuous flow system of airlift reactor with a 12 (twelve) hours hydraulic retention time. Aeration is carried out for 24 hours at a rate of 2 liters per minute (lpm). The height variation of top clearance (ht) is used to determine its effect on the aerobic granular formation. The ht variation used is 15 cm, 20 cm, and 30 cm. <br />
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The height of top clearance at the airlift reactor affects the circulation and superficial gas velocity which then affect the hydrodynamic shear force. The larger the hydrodynamic shear force, the better the granular quality will be. The granular quality is determined based on physical characteristics including sludge volume index (SVI), sludge density index (SDI), settling velocity, size, and aspect ratio. The result shows that the height of top clearance affects the granular quality that formed. However, the effect is not linear. The non-linearity of the relationship between the top clearance height and granular formation can be due to the large superficial gas velocity and biomass washout. The ht variation that provides the best granular quality is achieved at 15 cm, followed by 30 cm, and finally 20 cm. Th ht variation of 15 cm reaches an optimum result with the value of sludge volume index (SVI) is 50 ml/g, settling velocity 39,4 m/hour, sludge density index (SDI) 2.02 g/ml, size 3.5 mm, the aspect ratio of 0.86, and organic removal efficiency reaches 87.2%. <br />
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