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KMID : 1024520190280070607
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Journal of the Environmental Sciences
2019 Volume.28 No. 7 p.607 ~ p.615
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Study on the Biological Denitrification Reaction of High-Salinity Wastewater using an Aerobic Granular Sludge (AGS)
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Kim Hyun-Gu
Ahn Dae-Hee
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Abstract
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The purpose of this study is to biological treatment of high salinity wastewater using Aerobic Granular Sludge (AGS). In laboratory scale’s experiments research was performed using a sequencing batch reactor, and evaluation of the denitrification reaction in accordance with the injection condition of salinity concentration, surface properties of microorganisms, and sludge precipitability was performed. The results showed that the salinity concentration increased up to 1.5%, and there was no significant difference in the nitrogen removal efficiency; however, it showed a tendency to decrease gradually from 2.0% onward. The specific denitrification rate (SDNR) was 0.052 0.134 mg NO3 --N/mg MLVSS (mixed liquor volatile suspended solid)·day. The MLVSS/MLSS (mixed liquor suspended solid) ratio decreased to 76.2%, and sludge volume index (SVI30) was finally lowered to 57 mL/g. Using an optical microscope, it was also observed that the initial size of the sludge was 0.2 mm, and finally it was formed to 0.8-1.0 mm. Therefore, salinity injection provides favorable conditions for the formation of an AGS, and it was possible to maintain stable granular sludge during long-term operation of the biological treatment system.
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KEYWORD
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Aerobic granular sludge, Sequencing batch reactor, Salinity, Denitrification, SDNR
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