Abstract
This research was conducted as a part of continuous development of a bioprocess to treat thiocyanate($SCN^-$) in the leachate from an industrial landfill site. Detailed characteristics of the leachate, physical and chemical, was analyzed in this study. Time to reach equilibrium in $SCN^-$ degradation at different temperature, similar to the annual variation. was investigated for posssible adaptation of the bioprocess in the treatment site. Complete mineralization of $SCN^-$ to ammonia. bicarbonate and sulfate at all temperature range with except $5^{\circ}C$ trial was observed with different time elapsed to reach equilibrium. which shortened as the process of Fill-Draw proceeded. The final metabolites were mainly nitrate and sulfate. No fouling odor was detected and the settling characteristic of the biomass after the treatment was good(i.e., sludge volume index(SVI) ${\le}$80). Using MWT sludge as an inoculum showed better performance with respect to the elapsed time for treatment and sedimentation characteristics than those of using 2BET sludge.
미생물에 독성영향을 미치는 것으로 알려진 SCN 이 포항제철소내 관리형 매립시설에서 나오는 침출수에 함유된 농도는 미생물에 의해 제거될 수 있었다. 온도에 따른 SBR 운전 결과를 통하여 적응된 이후에 비해서 초기에 긴 적응기간이 필요하다. 온도가 증가함에 따라 초기 직응기간이 짧아지고 수렴하는 SCN 제거소요시간이 짧아짐을 알 수 있었다. $SCN^-$ 이 미생물의 애너지원과 질소, 황, 탄소원으로 사용되어 제거됨을 온도변화에 따른 SBR 운전으로 알 수 있었다.
