This study evaluated a potential sterilization process that uses calcium hypochlorite (Ca(ClO)2) as a disinfectant and hydrogen peroxide (H2O2) as a neutralizing agent for monoculture processes of microalgae (Nannochloropsis oculata). The results showed that no contaminants (prokaryote) were present when the Ca(ClO)2 concentration was greater than 0.010%. The use of an equivalent amount of H2O2 completely neutralized Ca(ClO)2 and had an additional bactericidal effect because of the formation of singlet oxygen. No substantial difference was observed in the biomass accumulation and chlorophyll contents compared to those in cultures sterilized using conventional physical methods such as autoclaving. Therefore, chemical sterilization using Ca(ClO)2 and H2O2 has an excellent economic advantage, and we expect the proposed ecofriendly chemical sterilization method to become a critical culture technology for microalgae-related industrialization.

본 연구에서는 배가스 내 존재하는 오염물질인 NO의 처리효율을 증대시키기 위하여 NO 산화 공정을 연구하였으며, 강력한 산화력의 건식산화제를 제조하는 방법으로 H2O2 촉매분해가 도입되었다. H2O2 분해공정 상에서 적용 가능한 K-Mn/Fe2O3 불균일계 촉매가 제조되었으며, 이들이 가지는 물리화학 적 특성이 H2O2 분해반응에 미치는 영향이 조사되었다. 제조된 건식산화제는 NO가 포함된 모사 배가스를 처리하기 위한 NO 산화공정에 적용되었으며, 다양한 모사 배가스의 유량(5, 10, 20 L/min)에서 약 100% 가까운 NO 전환율을 확인 하였다.

The photocatalysts of Fe-ACF/TiO2 compositeswere prepared by the sol-gel method and characterizedby BET, XRD, SEM, and EDX. It showed that the BET surface area was related to adsorption capacity foreach composite. The SEM results showed that ferric compound and titanium dioxide were distributed on thesurfaces of ACF. The XRD results showed that Fe-ACF/TiO2 composite only contained an anatase structurewith a Fe mediated compound. EDX results showed the presence of C, O, and Ti with Fe peaks in Fe-ACF/TiO2 composites. From the photocataytic degradation effect, TiO2 on activated carbon fiber surface modifiedwith Fe (Fe-ACF/TiO2) could work in the photo-Fenton process. It was revealed that the photo-Fenton reactiongives considerable photocatalytic ability for the decomposition of methylene blue (MB) compared to non-treatedACF/TiO2, and the photo-Fenton reaction was improved by the addition of H2O2. It was proved that thedecomposition of MB under UV (365nm) irradiation in the presence of H2O2 predominantly accelerated theoxidation of Fe2+ to Fe3+ and produced a high concentration of OH. radicals.