Performance Evaluation of Sequencing Batch Biofilm Reactor for Nitrogen Removal from Saline Domestic Wastewater

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Jiraporn Ananthayakorn
Suppakiet Sripanomtanakorn


The objective of this study was to evaluate the performance of a SBR with moving-bed biofilm on N and COD removal efficiencies in saline domestic wastewater. The SBR reactor was operated under the operation of nitrification-denitrification process. The process was subjected to 4-h aeration followed by 5-h anoxic and 1-h aeration stage. The effects of COD:N ratio and salt concentration on the N and COD removal efficiencies in moving-bed sequencing batch reactors with synthetic wastewater were investigated. The results showed that the operating COD:N ratio of 3:1 had the highest performance in both the COD and N removal efficiencies. For the domestic wastewater of Pataya City Hall, the percentage of the COD, total N, and ammonia-N removal efficiencies ranged from 79 to 86 mg/l, 77 to 81 mg/l, and 80 to 86 mg/l, respectively at the operation COD:N ratios of 2.6:1-3.9:1. The monitoring of COD value and nitrogen transformation during cycle operation indicated that the COD and nitrogen removal efficiencies were improved by using of SBR with moving-bed biofilm occured with partial denitrification and nitrogen removal pathway was shortening by salt content in wastewater.

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