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차수길,이병헌,정승현 한국환경보건학회 2002 한국환경보건학회지 Vol.28 No.1
Entrapped media with cellulous triacetate in which activated sludge was applied to induce operating factors and sewage treatment on site. The results are summarized as follows; The treatment efficiency of entrapped media is 92%, 90% and 80% at the size of 5mm, 7mm, and 12mm, respectively. Also, treatment efficient rate was increased by the packed amount of media in less than 30 % packed, while in more than 40 % packed that was decreased. It takes 10 day to reach the steady states and it is less than the existing activated sludge method. The slopes of oxygen consumption rate are almost parallel both in the entrapped media and free sludge. When organic loading rate is less than 1.0 kg/m3ㆍd on site, it is achieved good removal rate independent of changes of loading rate.
오리나무 열매를 이용한 생물처리장치에서의 톨루엔 가스 처리효율 특성
공남식,차수길,서정윤 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.6
This study was to examine characteristics of treating toluene vapor, which gets to be problematic due to its harmful carcinogenicity and mass generation from various sources, through a biological treatment facility which is environment-friendly and adopts a high-efficient and low-cost clean technology. In order to identify whether Alnus Firma Fruit (AFF) can be used as a media for a bioreactor, its utility and basic operating factors, a study was conducted on pressure drop, supply of nutrient substances and retention time which are operating factors of a biofilter, and eliminating characteristics were compared between AFF and the conventional biological activated carbon (BAC) widely used as filter media. In the case of AFF, the initial microbial deposits was 2.3 X 10^(7) CFU/g dry AFF, which represents the initial microbial density higher than the case of BAC showing 5.5 x 10^(6) CFU/g dry BAC. And it took about 2 weeks to acclimate until its eliminating rate got to be increased over 90%. As a result of comparing pressure loss taking place with the lapse of time between BAC and AFF, after 130 days passed at SV 25 h^(-1), BAC showed that its eliminating efficiency had a tendency to drop greatly due to a great pressure loss (0.53-> 54.7 ㎜H₂O/m) caused by an excess of biomass as accumulated. On the other hand, AFF showed that the pressure drop was 0.53 ㎜H₂O/m, about 2 times as much as the initial pressure loss of 0.4 ㎜H₂O/m, which represents no great change in the pressure loss, and its eliminating efficiency was also shown to be continuously high. Therefore, when AFF was used as a filler for a biological treatment facility, a biological filter enabling improvement of the purifying efficiency to be promoted could be provided, and moreover, the pressure loss was so small that the filler replacement cycle or the back flushing cycle could be extended. So, even in terms of the operating cost, it was identified to be an economical filler. When an inorganic material was used as a filler, the biofilters performance acted sensitively on whether nutrient substances were supplied or not. In the case of AFF with low adsorptivity, addition of ethyl-alcohol increased the solubility of toluene, and consequently, biodegradation got to be actively made by microbes, and thus, its eliminating rate could be increased. As the flow velocity and the inflow concentration got to be more increased, its eliminating rate got to be lower, and particularly, an increase in the flow velocity made its eliminating rate drop more greatly than an increase in the concentration.