Effect of Organic Loading Rates on Performance of Treating Dairy Wastewater in a Lab-Scale Sequencing Batch Reactor

Khac-Uan Do; Thuy-Ngan Thi Bui; Hung-Thuan Tran; Xuan-Quang Chu

doi:10.46604/ijeti.2023.10763

Authors

Khac-Uan Do School of Environmental Science and Technology, Hanoi University of Science and Technology, Hanoi, Vietnam
Thuy-Ngan Thi Bui Center for Advanced Materials Technology, National Center for Technological Progress, Hanoi, Vietnam
Hung-Thuan Tran Center for Advanced Materials Technology, National Center for Technological Progress, Hanoi, Vietnam
Xuan-Quang Chu Center for Advanced Materials Technology, National Center for Technological Progress, Hanoi, Vietnam

DOI:

https://doi.org/10.46604/ijeti.2023.10763

Keywords:

dairy wastewater treatment, sequencing batch reactor, organic loading rates, sludge

Abstract

This study aims to investigate, the effect of organic loading rates (OLRs), nutrient ratio addition, and sludge retention time (SRT) on treating dairy wastewater in a sequencing batch reactor (SBR) system. This investigation is verified by experiments conducted in 3 phases at 3 different OLRs (1.8, 1.2, and 0.9 kg/m³d, respectively). Urea ((NH₂)₂CO) is added to make a suitable (COD:N:P) ratio of (100:5:1) in dairy wastewater. The SRT is adjusted from 50 days to an appropriate value of 18 days. The obtained results show that the COD, TN, and TP removal efficiencies are increased with decreasing OLRs. Sludge concentration in the SBR tank is stable at 1100 mg/L after adding (NH₂)₂CO. In addition, the SBR operated at a suitable SRT (i.e. 18 days) helps the biomass stably, resulting in enhancement of COD, TN, and TP removal. The results are helpful to the design of SBR for treating dairy wastewater.

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