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Performance Evaluation of Bench-Scale Sulfur-Oxidizing Autotrophic Denitrificaiton Process Using Different Packing Material and Position in Reactor  

Sim, Dong-Min (Division of Environmental Engineering and Biotechnology, Myong-Ji University)
Ahn, Ju-Hyeon (Division of Environmental Engineering and Biotechnology, Myong-Ji University)
Kim, Seoung-Hyun (Division of Environmental Engineering and Biotechnology, Myong-Ji University)
Gwon, Eun-Mi (Division of Environmental Engineering and Biotechnology, Myong-Ji University)
Chung, Wook-Jin (Division of Environmental Engineering and Biotechnology, Myong-Ji University)
Jin, Chang-Suk (Jeon Tech. CO, LTD.)
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Abstract
In this study, we evaluated the efficiency of using sulfur-$CaCO_3$ complex pellet in the sulfur oxidizing autotrophic denitrification process for synthetic wastewater with high $CaCO_3$ concentration. The sulfur-$CaCO_3$ complex pellet was packed in reactor(R4). Influent ${NO_3}^--N$ loading rate was from 200 to $1,000g/m^3{\cdot}day$. During the operation, average denitrification efficiency of R4 was above 95%. Particularly, the denitrififation rate at $1,000g/m^3{\cdot}day$ loading was 98.96% for R4. High ${NO_3}^--N$ removal efficiency was determined in R4 compared with other reactors. Through $Ca^{2+}$ and alkalinity analyses, we calculated the supplied alkalinity from the packed $CaCO_3$ in the reactor. Sulfur-$CaCO_3$ complex pellet more effectively supplied alkalinity through the dissociation of $CaCO_3$ as compared with other media. Based on these results, sulfur-$CaCO_3$ complex pellet increased the pH buffering capacity while also providing the carbon source to the denitrifying bacteria. Denitrification efficiency of R4 was also higher than other reactors. ESEM pictures of sulfur-$CaCO_3$ complex pellet show higher porosity than that of the granular sulfur. Hence, more denitrifying bacteria attached on the sulfur-$CaCO_3$ complex pellet than on granular sulfur. It can be concluded that the sulfur-$CaCO_3$ complex pellet is a more suitable media for a sulfur oxidizing autotrophic denitrification process as it provides high denitrification efficiency.
Keywords
Sulfur-Oxidizing Autotrophic Dentrification; sulfur-$CaCO_3$ Complex Pellet; Alkalinity; ${NO_3}^--N$ Removal;
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