ANALISIS HIDRODINAMIKA AERATION TANK PADA WASTEWATER TREATMENT PLANT MENGGUNAKAN SOFTWARE COMPUTATIONAL FLUID DYNAMIC

ALBANI, ARIS (2024) ANALISIS HIDRODINAMIKA AERATION TANK PADA WASTEWATER TREATMENT PLANT MENGGUNAKAN SOFTWARE COMPUTATIONAL FLUID DYNAMIC. S1 thesis, Universitas Mercu Buana Jakarta.

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Abstract

Wastewater Treatment Plants (WWTP) are required to treat municipal and industrial wastewater to reduce pollutant impacts on the environment. In WWTP, the Aeration Tank is one of the most important processes in wastewater treatment. Aeration systems with fine bubble diffusers have been implemented over the last 20 years, proving to provide high oxygenation performance. However, the issue in aeration tanks lies in the difficulty of predicting gas hold-up in deep aeration tanks. Therefore, more accurate information about the local hydrodynamics of the aeration tank is needed to better understand the impacts of design and operational parameters. This research conducts simulations of flow patterns in the aeration tank and the layout of diffusers in the aeration basin affecting gas hold-up. Computational Fluid Dynamics (CFD) methods allow visualizing the impacts of design parameters and operational strategies on local hydrodynamic systems. Additionally, including turbulence and multiphase modeling enables more detailed modeling of WWTP aeration systems where gas-liquid fluid flow is modeled using the Mixture model with Slip-condition. The simulation results are compared with experimental data obtained from a 1:10 scale experimental study. Measurements are conducted using Particle Image Velocimetry (PIV) because it can measure observation fields simultaneously without disturbing the flow. The measurement and simulation results show that the flow in the aeration tank is turbulent with complex flow patterns. Streamlines and velocity vectors show that the flow direction tends to converge towards the center before experiencing high turbulence and then blending. The flow pattern is relatively uniform up to an average height of 150 mm. Comparison between simulation results and experimental data indicates that CFD simulations can predict flow and aeration in the aeration tank quite accurately. KEYWORD : wastewater treatment plant, wwtp, gas hold-up, aeration tank, CFD Wastewater treatment plants (WWTP) dibutuhkan untuk mengolah air limbah kota dan industri untuk mengurangi dampak polutan pada lingkungan. Dalam WWTP Tangki aerasi adalah salah satu proses terpenting dalam pengolahan air limbah. Sistem aerasi dengan gelembung halus (Fine bubble) telah diterapkan sejak 20 tahun terakhir. Terbukti memberikan kinerja oksigenasi tinggi. Akan tetapi permasalahan di tangki aerasi adalah sulit memprediksi gas hold up pada tangki aerasi yang dalam. Maka informasi yang lebih tepat tentang hidrodinamika lokal tangki aerasi diperlukan untuk lebih memahami dampak dari desain dan parameter operasi. Pada penelitian ini dilakukan simulasi pola aliran dalam tangki aerasi dan tata letak difusser di bak aerasi mempengaruhi gas hold up. Metode CFD memungkinkan untuk memvisualisasikan dampak dari parameter desain dan strategi operasional pada sistem hidrodinamik lokal. Selain itu, dimasukkannya pemodelan turbulensi dan multifase memungkinkan pemodelan lebih terperinci dari sistem aerasi WWTP di mana aliran fluida gas-cair dimodelkan menggunakan model Mixture model with Slip-condition. Hasil simulasi dibandingkan dengan data eksperimental yang diperoleh dari studi eksperimental skala 1:10 Pengukuran dilakukan dengan metode Particle Image Velocimetry (PIV) karena mampu mengukur bidang pengamatan secara simultan tanpa merusak aliran. Hasil pengukuran dan simulasi menunjukkan bahwa aliran dalam tangki aerasi bersifat turbulen dengan pola aliran yang kompleks. Streamline dan vector kecepatan, tampak bahwa arah aliran memiliki kecenderungan mengarah ke tengah sebelum mengalami turbulensi tinggi kemudian membaur. Pola aliran relatif seragam sampai pada ketinggian rata-rata 150 mm Perbandingan antara hasil simulasi dan data eksperimental menunjukkan bahwa simulasi CFD mampu memprediksi aliran dan aerasi dalam tangki aerasi dengan cukup akurat. Kata Kunci : wastewater treatment plant, wwtp, gas hold up, tangki aerasi, CFD

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