Pengaruh Desain Impeller terhadap Perilaku Hidrodinamika dan Efisiensi Penyisihan TSS serta Kekeruhan pada Proses Koagulasi Flokulasi

Cahya Nova Putri Maharani; Tuhu Agung Rachmanto

Authors

Cahya Nova Putri Maharani Universitas Pembangunan Nasional Veteran Jawa Timur Author
Tuhu Agung Rachmanto Universitas Pembangunan Nasional Veteran Jawa Timur Author

Keywords:

Koagulasi Flokulasi, Hidrodinamika, Impeller, Baffle, Air Limbah Domestik

Abstract

Domestic wastewater pollution remains a significant environmental issue in Indonesia, characterized by high levels of Total Suspended Solids (TSS) and turbidity that exceed quality standards. One of the effective treatment methods is the coagulation flocculation process, which involves the addition of chemical coagulants, such as Poly Aluminium Chloride (PAC). This study aims to analyze the influence of hydrodynamic variables, including the presence of baffles, impeller types (paddle, turbine, and propeller), and impeller installation height, on flow patterns, floc formation, and the removal efficiency of TSS and turbidity. Experiments were conducted using a laboratory scale tank with impeller positions varied at 30–50% of the impeller diameter from the bottom of the tank. The results showed that the flow pattern within the tank was significantly affected by the impeller design and installation height, while the presence of baffles with small dimensions tended to accelerate floc breakage. The optimum condition was achieved using a turbine with four flat blades and a vaned disc, installed at a height of 3.0 cm from the tank bottom without baffles, resulting in TSS and turbidity removal efficiencies of up to 91.67% and 83.27%, respectively. This study highlights the critical role of hydrodynamic variables in enhancing the effectiveness of the coagulation flocculation process for domestic wastewater treatment.

References

[1] Badan Pusat Statistik Indonesia, Statistik Indonesia 2025, vol. 53. Jakarta: Badan Pusat Statistik, 2025. [Daring]. Tersedia pada: https://www.bps.go.id/id/publication/2025/02/28/8cfe1a589ad3693396d3db9f/statistik-indonesia-2025.html

[2] BPS Kota Surabaya, Kota Surabaya dalam Angka 2025, vol. 37. Surabaya: BPS Kota Surabaya, 2025. [Daring]. Tersedia pada: https://surabayakota.bps.go.id/id/publication/2025/02/28/bd1f25e59ae790cc8a7c0c07/kota-surabaya-dalam-angka-2025.html

[3] Gubernur Jawa Timur, Peraturan Gubernur Jawa Timur Nomor 72 Tahun 2013 tentang Baku Mutu Air Limbah Bagi Industri dan/atau Kegiatan Usaha Lainnya. 2013.

[4] R. T. Setiawati dan I. F. Purwati, “Perencanaan Instalasi Pengolahan Air Limbah Domestik di Kecamatan Simokerto Kota Surabaya,” IPTEK J. Proc. Ser., vol. 3, no. 5, 2017, doi: 10.12962/j23546026.y2017i5.3176.

[5] A. Masduqi dan A. F. Assomadi, Operasi & Proses Pengolahan Air, 2 ed. Surabaya: ITS Press, 2016.

[6] N. I. Said, Teknologi Pengolahan Air Limbah : Teori Dan Aplikasi. Jakarta: Erlangga, 2017.

[7] R. M. A. Dienullah, “Pengaruh Bentuk Impeller pada Proses Koagulasi-Flokulasi dalam Mengolah Limbah Industri Batik Organik,” UPN “Veteran” Jawa Timur, 2021.

[8] M. L. Dzaky, “Pengaruh Desain Pengaduk Terhadap Penurunan Parameter Total Suspended Solid Dan Kekeruhan Pada Proses Koagulasi Flokulasi,” UPN “Veteran” Jawa Timur, 2025.

[9] K. M. I. Utari, “Pengaruh Variasi Bentuk Impeller pada Proses Koagulasi Flokulasi terhadap Pola Aliran,” UPN “Veteran” Jawa Timur, 2023. doi: 10.55123/insologi.v2i4.2483.

[10] M. Yao, Z. Ran, T. Chen, Q. Wu, dan X. Dong, “Numerical Simulation Studies of Agitating Paddle Dependence on Characteristics of the Flow Field in the Mechanical Continuous Flow Stirred Reactor for Flocculation,” Desalin. Water Treat., vol. 183, hal. 30–41, 2020, doi: 10.5004/dwt.2020.25181.

[11] Badan Standardisasi Nasional, SNI 6989.59:2008 tentang Metode Pengambilan Contoh Air Limbah. Tangerang: Badan Standardisasi Nasional, 2008. [Daring]. Tersedia pada: http://ciptakarya.pu.go.id/plp/upload/peraturan/SNI_-6989-59-2008-_Metoda-Pengambilan-Contoh-Air-Limbah.pdf

[12] Badan Standardisasi Nasional, SNI 6989.3:2019 tentang Cara Uji Padatan Tersuspensi Total (Total Suspended Solid, TSS) Secara Gravimetri. Tangerang: Badan Standardisasi Nasional, 2019.

[13] Badan Standardisasi Nasional, SNI 06-6989.25-2005 tentang Cara uji Kekeruhan dengan Nefelometer. Tangerang: Badan Standardisasi Nasional, 2005.

[14] Badan Standardisasi Nasional, SNI 6989.11:2019 tentang Cara Uji Derajat Keasaman (pH). Tangerang: Badan Standardisasi Nasional, 2019.

[15] Badan Standardisasi Nasional, SNI 06-6989.23-2005 tentang Cara Uji Suhu dengan Termometer. Tangerang: Badan Standardisasi Nasional, 2005.

[16] Badan Standardisasi Nasional, SNI 19-6449-2000 tentang Metode Pengujian Koagulasi-Flokulasi dengan Cara Jar. Tangerang: Badan Standardisasi Nasional, 2000.

[17] Metcalf dan Eddy, Wastewater Engineering Treatment and Resource Recovery, 5th ed. New York: McGraw-Hill Education, 2014.

[18] W. J. Yang, Handbook of Flow Visualization, 2nd Edition. New York: Taylor & Francis, 2001.

[19] International Organization for Standardization, ISO 22412:2008 Particle Size Analysis — Dynamic Light Scattering (DLS). Switzerland: International Organization for Standardization, 2008.

[20] A. A. A. Rasool, S. S. Ahmad, dan F. A. Hamad, “Effect of Impeller Type and Rotational Speed on Flow Behavior in Fully Baffled Mixing Tank,” Int. J. Adv. Res., vol. 5, no. 1, hal. 1195–1208, Jan 2017, doi: 10.21474/IJAR01/2871.

[21] W. He, L. Xue, B. Gorczyca, J. Nan, dan Z. Shi, “Experimental and CFD Studies of Floc Growth Dependence on Baffle Width in Square Stirred-Tank Reactors for Flocculation,” Sep. Purif. Technol., vol. 190, hal. 228–242, Jan 2018, doi: 10.1016/j.seppur.2017.08.063.

[22] A. S. Shihab dan A. T. Hamad, “Effect of Inclination Angle, Dimensions of Impeller Blades, and Velocity Gradient on The Efficiency of Water Flocculation,” Int. J. Civ. Eng. Technol., vol. 9, no. 5, hal. 969–977, 2018.