Loviantary, Anindya (2026) Strategi Pengaturan Rasio Resirkulasi dan Laju Aliran Udara dalam Mengontrol Sludge Volume Index (SVI) pada Pengolahan Air Limbah Rumah Makan. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
Restaurant wastewater treatment using the activated sludge system is strongly influenced by sludge stability, which can be evaluated through the Sludge Volume Index (SVI). The sludge recirculation ratio (Return Activated Sludge) and air flow rate are two key operational parameters that determine biomass distribution and dissolved oxygen availability within the system, yet their interaction in controlling SVI for laboratory-scale restaurant wastewater treatment remains poorly studied. This study aims to analyze the effect of recirculation ratio and air flow rate variations on SVI, Chemical Oxygen Demand (COD), and Total Suspended Solids (TSS) values, and to determine the optimum combination of both parameters as a strategy for SVI control in an activated sludge unit. The research was conducted using a laboratory-scale reactor with variations in air flow rate (1, 2, and 3 L/min) and recirculation ratio (15%, 30%, 45%, 60%, and 75%), followed by multiple linear regression statistical analysis and activated sludge morphology characterization using SEM-EDX. The results showed that increasing air flow rate and recirculation ratio significantly decreased SVI values and improved COD and TSS removal efficiency (p < 0.05), although no significant interaction was found between the two factors on any of the three parameters. The best operating condition was obtained at a combination of 3 L/min air flow rate and 75% recirculation ratio, yielding an SVI of approximately 85 mL/g, COD removal efficiency of approximately 69%, and TSS removal efficiency of approximately 82%. SEM-EDX characterization under the optimum condition revealed compact activated sludge flocs supported by an extracellular polymeric substances (EPS) matrix, contributing to floc stability and improved settling. This study is expected to serve as a technical recommendation for adjusting the recirculation ratio and air flow rate to enhance the stability and performance of restaurant wastewater treatment.
| Item Type: | Thesis (Undergraduate) | ||||||||||||
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| Subjects: | T Technology > TD Environmental technology. Sanitary engineering | ||||||||||||
| Divisions: | Faculty of Engineering > Departement of Environmental Engineering | ||||||||||||
| Depositing User: | Anindya Loviantary | ||||||||||||
| Date Deposited: | 22 Jul 2026 02:43 | ||||||||||||
| Last Modified: | 22 Jul 2026 03:28 | ||||||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/57077 |
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