A study on the denitrification of reverse osmosis(RO) concentrated wastewater from sewage reuse treatment plant in P city was conducted using waste desulfurization agent obtained from desulfurization process. Sulfur-based autotrophic denitrifying carrier comprises the predetermined amount of waste iron sulfide (FeS, Fe2S3), mine drainage sludge and elemental sulfur showing mesoporisity with 9.9 nm (99 Å) of average pore size. Sulfur denitrifying bacteria and sulfur reducing bacteria were implanted into the pores of sulfur denitrifying carrier. Nitrate was not affected by empty bed contact time (EBCT). It is probably due to larger reducing capacity of the carrier than the concentration of nitrate in RO concentrated wastewater. Total nitrogen (T-N) removal efficiency exhibited about 90% after 4 days. Sulfate ion was surprisingly decreased with sulfur autotropic process due to the reduction of sulfate ion to HS- and S2- by sulfur reducing bacteria. Sulfide and hydrogen sulfide ions were then taken by Fe(OH)3, main component of mine drainage sludge, releasing OH-. Alkalinity was therefore maintained between 7.5 and 8.5 in pH by the released OH-. Also, it had the effect of suppressing the production of H2S, which causes bad odor.

ABSTRACT
1. 서 론
2. 재료 및 실험 방법
    2.1 황탈질 담체 제조
    2.2 담체의 물성 분석
    2.3 황탈질 담체의 미생물 식종
    2.4 RO 농축폐수 채수 및 성상
    2.5 연속식 칼럼 실험
3. 결과 및 고찰
    3.1 황탈질 담체 물성분석
    3.2 황탈질 미생물 식종
    3.3 연속식 칼럼실험
4. 결 론
사 사
References

• 김신동(㈜이앤켐솔루션 에너지, 환경연구소) | Shin-Dong Kim (Energy & Environment Research Center, E&Chem Solution) Corresponding author
• 김화중(㈜이앤켐솔루션 에너지, 환경연구소) | Wha-Jung Kim (Energy & Environment Research Center, E&Chem Solution)
• 이재명(㈜이앤켐솔루션 에너지, 환경연구소) | Jae-Myung Lee (Energy & Environment Research Center, E&Chem Solution)
• Huu Hoa Vu(㈜이앤켐솔루션 에너지, 환경연구소)
• 김영노(한양대학교 건설환경공학과) | Youngnoh Kim (Department of Civil & Environmental Engineering, Hanyang University)
• 오상은(강원대학교 바이오자원환경학과) | Sang-Eun Oh (Department of Biological Environment, Kangwon National University)