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.

In this research, the coating behavior of Mg and Fe desulfurization powder fabricated by low energy and conventional planetary mill equipment was investigated as a function of milling time, which produces uniform Fe coated powders due to milling energy. Since high energy ball milling results in breaking the Fe coated Mg powders into coarse particles, low energy ball milling was considered appropriate for this study, and can be implemented in desulfurization industry widely. XRD and FE-SEM analyses were carried out to investigate the microstructure and distribution of the coating material. The thickness of the Fe coating layer reaches a maximum of 14 at 20 milling hours. The BCC structures of Fe particles are deformed due to the slip system of Fe coated Mg particles.

기후변화의 원인으로는 온실가스의 과량 배출이 문제화 되는 현 시점에서 온실가스 중 가장 많은 양을 차지하는 이산화탄소의 경우 기후변화에 미치는 영향이 다른 종류의 온실가스보다 크다는 것은 널리 알려진 사실이다. 여러 분야의 산업과 인간 활동에서 발생하는 이산화탄소를 KOH 흡수제를 통해 흡수된 CO2양을 측정하고 발전소 탈황 공정에서 발생하는 ASH를 첨가하여 반응시켜 생성된 CaCO3를 다른 유용한 물질로 전환하여 자원화하고 재사용하는 것이다. 본 연구에서는 KOH 흡수제 농도에 따른 CO2 흡수량 측정과 KOH 흡수제와 흡수첨가제(piperazine)을 함께 넣고 흡수된 CO2양을 측정하였다. 또한, CO2 loading curve 이용하여 CO2 흡수량을 계산하였으며, 화력발전소의 탈황공정에서 발생하는 ASH와 CO2가 흡수된 KOH를 수용액과 반응시켜 생성된 시간당 CaCO3의 양을 측정하고 분석기기 XRD(X-Ray Diffraction)와 SEM(Scanning Electron Microscope)을 사용하여 결정 구조와 표면 구조를 분석하였다.