Pengaruh Kondisi Aliran Dan Konfigurasi Baffle Terhadap Dispersi Klorin Dan Dinamika Pencampuran: Pendekatan Computational Fluid Dynamics (CFD)

Ruwayfi, Muhammad Kaysan (2026) Pengaruh Kondisi Aliran Dan Konfigurasi Baffle Terhadap Dispersi Klorin Dan Dinamika Pencampuran: Pendekatan Computational Fluid Dynamics (CFD). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dynamics (CFD) dan tracer test. Tiga konfigurasi baffle (tanpa baffle/B3, baffle rapat 10 cm/B1, dan baffle jarang 33 cm/B2) dikaji pada tiga debit (120, 240, dan 480 L/jam), menghasilkan sembilan skenario dengan dosis tracer sekitar 1 mg/L yang ditetapkan melalui uji iodometri dan breakpoint chlorination. Validasi hidraulik dilakukan dengan membandingkan kurva RTD hasil CFD dan tracer test pada skenario B1Q1, B1Q2, dan B2Q1. Selisih T10 antara CFD dan tracer hanya sekitar 2–3 menit, dengan nilai short circuiting index (SCI) dan Morrill Index (MI) yang sangat berdekatan, sehingga model dinilai cukup representatif untuk analisis indikator hidraulik. Secara umum, konfigurasi tanpa baffle menunjukkan baffling factor (T10/HRT) rendah, sekitar 0,35–0,44, dengan MI hingga 5,32 dan SCI minimum 0,07, yang menandakan short circuiting kuat dan sebaran waktu tinggal yang lebar. Sebaliknya, konfigurasi berbaffle meningkatkan BF hingga sekitar 0,61–0,73, menurunkan MI ke kisaran 1,47–1,80, dan menaikkan SCI menjadi 0,52–0,70, sehingga aliran lebih mendekati plug flow. Homogenitas pencampuran dinilai menggunakan Coefficient of Variation (CoV) temporal dan spasial. CoV temporal di outlet (2–3 HRT) berkisar 4–21%, dengan nilai terendah pada B2Q2 dan B1Q2, sedangkan CoV spasial berada pada kisaran 9–24%, dengan distribusi ruang terbaik pada B3Q1 dan terburuk pada B2Q1. Secara keseluruhan, konfigurasi berbaffle pada debit tinggi memberikan kombinasi BF tinggi, SCI dan MI yang lebih baik, serta CoV lebih rendah, sehingga direkomendasikan untuk meningkatkan efektivitas contact time tanpa peningkatan dosis klorin berlebih.
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Hydraulic inefficiencies can reduce disinfection performance by decreasing hydraulic efficiency and causing non-uniform chlorine distribution. This study evaluated the effects of baffle configuration and flow rate on chlorine dispersion and the hydraulic performance of a laboratory-scale reservoir by integrating Computational Fluid Dynamics (CFD) simulations with tracer tests. Three baffle configurations, namely no baffle (B3), closely spaced baffles (10 cm, B1), and widely spaced baffles (33 cm, B2), were investigated under three flow rates (120, 240, and 480 L/h), resulting in nine experimental scenarios. A tracer dose of approximately 1 mg/L was applied, as determined through iodometric analysis and breakpoint chlorination tests. Hydraulic validation was performed by comparing the Residence Time Distribution (RTD) curves obtained from CFD simulations and tracer tests for scenarios B1Q1, B1Q2, and B2Q1. The difference in T10 between CFD and tracer test results was only approximately 2–3 minutes, while the Short-Circuiting Index (SCI) and Morrill Index (MI) showed very similar values, indicating that the CFD model was sufficiently representative for hydraulic performance analysis. Overall, the no-baffle configuration exhibited a low Baffling Factor (BF = T10/HRT) of approximately 0.35–0.44, with an MI of up to 5.32 and a minimum SCI of 0.07, indicating severe short-circuiting and a broad residence time distribution. In contrast, baffled configurations increased the BF to approximately 0.61–0.73, reduced the MI to 1.47–1.80, and increased the SCI to 0.52–0.70, resulting in flow characteristics that more closely approached plug flow. Mixing homogeneity was evaluated using the temporal and spatial Coefficients of Variation (CoV). The temporal CoV at the outlet (2–3 HRT) ranged from 4% to 21%, with the lowest values observed in scenarios B2Q2 and B1Q2. Meanwhile, the spatial CoV ranged from 9% to 24%, with the most uniform spatial distribution achieved in B3Q1 and the least uniform in B2Q1. Overall, baffled configurations operating at higher flow rates provided the best combination of high BF, improved SCI and MI values, and lower CoV, and are therefore recommended to enhance effective contact time without requiring excessive chlorine dosage.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Klorin, desinfeksi, reservoir, Computational Fluid Dynamics, tracer test, mixing, T10, SCI, CoV
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TD Environmental technology. Sanitary engineering T Technology > TD Environmental technology. Sanitary engineering > TD395 Reservoirs (water supply) T Technology > TD Environmental technology. Sanitary engineering > TD430 Water--Purification. T Technology > TD Environmental technology. Sanitary engineering > TD433 Water treatment plants
Divisions:	Faculty of Civil Engineering and Planning > Environment Engineering > 25201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Kaysan Ruwayfi
Date Deposited:	28 Jul 2026 08:18
Last Modified:	28 Jul 2026 08:18
URI:	http://repository.its.ac.id/id/eprint/137594

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