Simulation of effective volume increasement inside oxidation ditch reactor

Rositayanti Hadisoebroto,Suprihanto Notodarmojo,Yazid Bindar,Ade Gafar Abdullah,Asep Bayu Dani Nandiyanto

doi:10.1051/matecconf/201819713022

Rositayanti Hadisoebroto, Suprihanto Notodarmojo + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/201819713022

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Abstract

Oxidation ditch reactor is wastewater treatment unit that based on activated sludge process. Water flow characteristic inside reactor is either completely-mixed reactor or plug flow reactor. Water flow characterization plays important role in wastewater treatment process. To ensure the biological process going well, the water flow in reactor must be completely mixed type. Characterization study of water flow in reactor consume time thus financial, so the simulation using CFD (Computational Fluid Dynamics) becomes a good solution. Based on the calibrated model, the CFD simulation was generate to define the water flow characteristic of the oxidation ditch reactor in longitudinal section. The simulation was conducted using VoF (Volume of Fluid) scheme, an open surface model in unsteady flow with k-ε turbulence model. The simulation result shows that water flow inside the oxidation ditch reactor was plug flow. The role of aeration system is to increase water flow to be more homogen, indicated by higher effective volume inside the reactor. The simulation result shows that the aerator could increase effective volume inside the reactor from 32,94% into 55,5%. The higher effective volume means dead zone inside the reactor is reduced.

Highlights

Wastewater treatment unit as a chemical reactor which occured chemical process inside it to change the substance of various chemical compounds
It has concluded that water flow in wastewater treatment unit is defined as multi phase flow [3,4,5,6]. [7,8] had studied hydrodynamics on reactor using variation in aerator type
It can be concluded that in without aeration system, the volume that used effectively as reaction zone is only one third of total volume, while in with aeration system, it is increase about half of total volume

Summary

Introduction

Wastewater treatment unit as a chemical reactor which occured chemical process inside it to change the substance of various chemical compounds. Reactor effectiveness are integral part of every wastewater and water treatment unit. Hydrodynamics aspects on plug flow reactor had widely studied, usually using tracer study. Computer simulation in hydrodynamics is computational fluid dynamic that has been widely used in wastewater treatment reactor [1,2].

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