In this study, we compared the MZVI (Microscale Zero-Valent Iron) and NZVI (Nanoscale Zero-Valent Iron) for reactivity and mobility in a column to reduce nitrate, which is a major pollutant in Korea, and investigated the effect of operational parameters on the NZVI filled column. For the comparison of MZVI and NZVI, samples were collected for 990 minutes using fractionator in the similar operation conditions (MZVI 10g, NZVI 2g). The nitrate reduction efficiency of NZVI was about 5 times higher than that of MZVI, which was about 7.45% and 38.75% when using MZVI and NZVI, respectively. In the mobility experiment, the MZVI descended due to gravity while NZVI moved up with water flow due to its small size. Furthermore, the optimum condition of NZVI filled column was determined by changing the flow rate and pH. The amount of Fe ions was increased as the pH of the nitrate solution was lowered, and the nitrate removal rate was similar due to the higher yield of hydroxyl groups. The removal rate of nitrate nitrogen was stable while flow rate was increased from 0.5 mL/min to 2.0 mL/min (empty bed contact time: 2.26 min to 0.57 min). NZVI has a high reduction rate of nitrate, but it also has a high mobility, so both of reactivity and mobility need to be considered when NZVI is applied for drinking water treatment.

본 연구는 제품 생산과정 시 해충혼입에 의한 소비자 해충 클레임 발생 가능성을 규명하고자 고농도 질소충진(98.6~98.8%) 유아용 캔 포장 분유제품에서의 화랑곡나방 알, 유충(4령)의 발육 가능성을 알아보았다. 고농도 질소가스와 일반 대기로 포장된 제품내부에서 보관기간에 따라 부화율, 우화율, 치사율 등을 조사하였고 포장해체 후 지속적으로 보관하면서 동일한 조사를 수행하였다. 실험 결과 질소충진 처리하였을 경우 보관기간에 관계없이 화랑곡나방 알과 유충은 100% 치사하였다. 그러나 질소가 충진되지 않은 처리구에서 유충 치사율은 대략 40%정도를 나타내었고, 보관 기간에 따라 유의한 차이는 보이지 않았다(df=2,27, F=2.06, P>0.05). 화랑곡나방 알의 경우 모든 반복에서 실크가 발견되어 부화가 이루어졌으나, 발육이 지속적으로 진행되었을 경우 발견되었을 것으로 예상되는 2~3령 유충이 발견되지 않아 분유제품이 갓 부화한 1령 유충의 먹이로는 적합하지 않은 것으로 조사되었다.