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The Effect of Salinity on Biological Nutrient Removal in SBR  

Song, Changsoo (Dept. of Civil and Environmental Engineering, Honam University)
Oh, Junseung (Dept. of Resource Engineering, Chonnam University)
Publication Information
Journal of Korean Society on Water Environment / v.18, no.3, 2002 , pp. 237-243 More about this Journal
Abstract
The effect of a salinity on the performance of a biological nutrient removal system was investigated using a model SBR(Sequencing Bach Reactor) system. The system was operated at a 12hr, 18hr, 24hr, and 36hr HRT with a salinity level of 20,000mg/L and compared with a system similarly operated with fresh water. The influent salinity level of 8,000 mg/L does not have a significant effect on BOD removal efficiency, there is a noticeable decrease in BOD removal rate from 10,000 mg Cl-/L. The Nitrogen could be removed from the saline wastewater with the same efficiency as for the fresh water because of low C/N ratio in anoxic period. The excess biological phosphorous removal is highly affected by the increase in the influent salinity. The efficiency is decreased from 96.6% to 43.4% when the influent salinity is increased from 0 to 20,000mg/L.
Keywords
SBR; salinity; BOD; Nitrogen; Phosphorous;
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