The characteristics of phosphorus removal from the wastewater containing high concentrations of PO43− and NH4+ bystruvite formation in a jet loop crystallizer was investigated. By adding air into the jet loop crystallizer, the initial pH ofthe wastewater (pH=7.2) was gradually increased to 8.0 due to the CO2 stripping. As a result, the amount of causticchemicals added to maintain a desired level of operational pH of 8.5 could be reduced. The molar ratio of Mg:P in thewastewater used was always below 1. Therefore, the magnesium concentration was the limiting factor for struviteformation. To find the effective magnesium source, MgCl2, MgSO4, MgO, MgO+MgCl2, and MgO+MgSO4 were usedas a magnesium source. Among these chemicals, MgO+MgSO4 was the most effective in saving the operational cost.Throughout the experiments, a high percentage (89%) of phosphorus removal was achieved when MgCl2 was used asan Mg source. The removal efficiencies of phosphorus in the jet loop crystallizer with aeration were higher than thosein the crystallizer without aeration.

This study was carried out to develop pilot plant Net3FM(Net Fit Fiber Filter Module) system and to suggest optimum operating condition for municipal wastewater reuse. SS concentration of biologically treated sewage effluent was reduced from 1.5~5.4mg/L to 0.4~1.0mg/L without coagulant injection in Net3FM system, and the SS removal efficiency was average 84.7%. And also, the removal efficiencies of COD and T-P were decreased slightly due to the SS removal by filtration. Coagulation-Filtration test was conducted to enhance the removal efficiencies of SS and T-P. The optimum dosage of coagulant was injected automatically by auto-controlling system, which is controlled by detecting value of turbidity of secondary sewage effluent. SS, COD and T-P concentrations in filtrated effluent were 0.21~0.57, 1.6~6.2 and 0.137~0.392mg/L with coagulant injection by in-line mixer in Net3FM system, respectively. The removal efficiencies of SS and T-P were highly increased to 92.8% and 89.8%, respectively. It was due to the combined the processes of coagulation and filtration. Net3FM system was evaluated that the removal efficiency of pollutants in secondary sewage effluent and the utilization potential as reclaimed water technology were very high.

To acquire preliminary data for the control of total nitrogen (TN) in S sewage treatment plant, which processes merging food waste and sewage, the effect of reject water on the total nitrogen in the effluent was examined in this study. Water quality data for the plant during the winter period were applied to calculate the mass balance. It was calculated that at least more than 231 kg/d TN should be removed to control the TN concentration in the effluent. Assuming 18 ppm as the goal TN concentration in the effluent, about 941 kg/d TN should be removed from this plant. Approximately 10% more TN should be removed than at present to achieve this result. It was observed that dewatering the filtrate had a considerably greater effect on the total nitrogen in the effluent than the reject waters. The dewatered filtrate contained 1,399kg/d TN. The contribution of the dewatered filtrate to the TN concentration in the effluent was 0.183, which was 7 to 23 times greater than the other reject waters. In addition, the amount of total nitrogen from the reject water, with the exception of the dewatering filtrate, was lower than the amount of TN that should be removed from S sewage treatment plant. Therefore, it was concluded that one of the most effective methods for controlling the TN concentration in effluent was the removal of the TN contained in the dewatering filtrate.

Emission characteristics of volatile organic compounds (VOCs) were investigated in the flue gas emitted from wood drying process for plywood manufacturing. The moisture content of raw timber was average 48%, and its density was 831.55 kg/m3. But the moisture content of dried wood is needed less than around 10%, thus the moisture contents of flue gas should be remarkably high(about 18.2 V/V%). Therefore, the vapor in flue gas is equivalent to 320 ton-vapor/day when 1100 ton-wood/day is treated in the wood drying process. The temperature of flue gas ranges from 140℃ to 150℃ in each dryer stack with exception of the input site of wood(about 110℃). The velocity of flue gas in each stack ranges from 1.7 to 9.7 m/sec. In order to assess the concentrations and attribution rate of odorous compounds, it was analyzed about 40 VOCs in the flue gases. It was found that the major odorous compounds were 8 compounds, and the concentrations of major VOCs(ppm) were as follows; benzene: 0.054～0.052, toluene: 1.011～2.547, ethylbenzene: 0.472～2.023, m,p-xylene: 0.504～3.245, styrene: 0.015～0.148, o-xylene : 0.271～1.097, ethanol: 11.2～32.5, α-pinene: 0.908～10.578, β-pinene: 0.982～14.278. The attribution rate of terpenes (α-pinene, β-pinene) was about 60.56%, and that of aromatics and alcohols was about 22.77%, and 16.67%, respectively. It is suggested that the adequate control device should be used to control both the water soluble and non-soluble compounds because both compounds were mixed in flue gas.

원예치료가 자아존중감의 향상과 우울증의 감소에 영향을 줄 것이라는 가설을 성립되었지만, 산재 이후 장애 발생으로 인한 심한 우울증이 단시일 내에 소거되는 것이 아니므로 프로그램 이후에 감소된 우울증 역시 그 정도가 중하기 때문에 우울증 감소를 위한 지속적인 심리치료 및 재활 치료는 물론 관리가 필요함을 보여주는 것이다. 그리하여 산재장애인의 특성에 맞도록 원예치료의 효과를 체계적이고 과학적으로 분석하여 대체 의학으로 더욱 발전하여, 생명의 존귀함을 자각하고 새로운 삶의 의욕과 희망을 줄 수 있도록 직업재활까지도 도움이 될 수 있는 방향으로 나아가야 할 것이다.

쥐오줌풀 부정근으로부터 valepotriates와 valerenic acids 함량을 증진시키고자 다양한 elicitor를 처리하였다. 쥐오줌풀 부정근의 생장은 YE 처리구를 제외한 모든 처리구에서 대조구에 비해 감소하였다. 그러나 valepotriates와 valerenic acids 생산은 모든 처리구에서 대조구에 비해 증가하였으며 특히, valepotriates는 100 μM MeJA 처리구에서 12.56 ± 0.78 mg/l, valerenic acids는 1 g/l YE 처리구에서 10.63 ± 1.1 mg/l 로 가장 높았으며, 이는 대조구에 비해 1.6배와 1.8배의 생산성증가를 가져왔다.

기관배양을 통한 대량증식 방법의 일환으로 액아배양을 이용한 multiple shoot 유도 조건을 조사하였다. 기내 배양 중인 식물체로부터 액아를 절취하여 TDZ와 BA를 각각 농도 별로 첨가한 MS배지와 1/2 MS배지에서 6주간 배양한 결과, MS기본배지에 0.005 mg·L-1 TDZ가 첨가된 처리구에서 효과가 가장 양호하였다. 한편 발생된 신초를 1 mg·L-1 GA3와 0.5 mg·L-1 IBA가 첨가된 1/2 MS배지에 배양했을 때 뿌리의 발생과 신장이 가장 양호하였다. 발근된 식물체를 포트에서 순화시켜 온실로 이식하였을 때 90%에 가까운 생존율을 보였으며 형태적인 변이 없이 생장하였다. 이상의 결과는 액아유도를 통한 대량번식의 가능성을 제시한다.

기능성 MA 포장에 의한 저장 후 품질의 변화를 기존의 방법과 비교하기 위하여 저장기간별로 24주까지의 중량, 경도, 산도, 당도, 부패율을 비교 분석하였다. 저장 20주후 중량 감소는 대조구는 , 포장구는 로 현격한 차이를 나타냈으며, 경도는 저장 24주후 대조구는 0.64 kgf, 포장구는 0.61 kgf로 비슷하게 유지되었으며, 당도는 저장 24주후 대조구는 , 포장구는 로 유의성을 나타내지 않았으며, 산도 역시 저장 24주후 대조구 , 포