Considering the characteristics of aldehydes among volatile organic compounds, a combined process was established by linking an absorbent and a photocatalytic reactor. Experiments to find the optimal operating conditions of the combined process showed that as the amount of photocatalyst coating increases, the wavelength of the ultraviolet lamp used becomes shorter, the photodegradation rate becomes faster, and the removal efficiency increases. It was also demonstrated that by controlling the relative humidity during the connection process of the combined process, the re-evaporation phenomenon at the front end (absorption area) of the hybrid process can be improved and the removal efficiency at the back end (photocatalytic reaction area) can be significantly enhanced. This confirmed the need for a combined process that complements the advantages and disadvantages of each process.

유기농업자재 제조 원료가 되는 주요 식물인 제충국, 고삼, 데리스, 님 등은 대부분 수입에 의존하고 있는 실정 으로 제품수급, 효용성 및 안전성 등에 빈번한 문제가 발생되고 있다. 이러한 문제점을 해결하기 위하여 국내 자생식물을 추출물 원료로 이용하기 위한 연구를 수행하고 있다. 이중 마트린이 함유되어 살충제로 이용되고 있는 고삼에 흰가루병, 총채벌레, 줄붉은들명나방, 담배거세미나방, 거품벌레류가 발생하여 피해를 주었다. 특 히 줄붉은들명나방(Uresiphita prunipennis)은 7월 하순부터 9월 중순까지 발생하여 엽육을 갉아먹고 엽맥만 남기는 피해를 주었고, 피해주율은 11% 였다. 이를 방제하기 위해 18종의 유기농업자재의 살충효과를 조사한 결과 주성분이 마늘추출물 80%, 데리스추출물 70% 등인 자재 6종이 80% 이상의 살충률을 나타내었다.

Because Scotinophara lurida has the habit of living under the rice plant, an introduction of a method for efficient control when spraying eco-friendly organic materials is needed. In this study, we investigated the density of S. lurida in drained- and irrigated-paddy field after spraying an organic material containing garlic bulb extracts, which has high insecticidal activity in S. lurida in direct spraying test in glass tube. As a result, an irrigated rice paddy showed a control effect of 66.4% after 3 days of spraying and 86.2% after 7 days, while a drained rice paddy showed a control effect of 33.9% after spraying and 61.9% after 7 days. These results suggest that effective control can be achieved in irrigated rice fields if organic farming materials are evenly sprayed and reach to the body of S. lurida. It is remained to study how irrigated water do contribute to increase the insecticidal effect in the future.

Starfish are creatures that destroy marine ecosystems due to their high reproductive rate and predatory nature. Instead of mass incineration, this study attempted to utilize them as functional adsorbents to control odorous organic compounds. This waste starfishbased adsorbent showed a high aldehyde capture efficiency of 91.1%. The maximum specific surface area of the prepared waste starfish adsorbent was 2.19m2/g, and the adsorption amount was 101.66mg/g. Therefore, it was confirmed that the waste starfish had the ability to perform well as an adsorbent.

고려엉겅퀴(Cirsium setidens Nakai)는 여러해살이 초본식물로서 식용이 가능하며 곤드레라고 부르기도 한다. 최근 고려엉겅퀴에 여뀌못 털진딧물(Capitophorus elaeagni, Del Guercio)의 발생이 확인되어 재배농가의 피해가 예상되고 있다. 이에 대한 친환경적인 방제방법 구명을 위 해 시판 유기농업자재를 이용하여 고려엉겅퀴 식물체에 발생한 여뀌못털진딧물에 대한 방제효과를 검정한 결과 pyrethrins+paraffinic oils 이 98% 수준의 방제가를 보여주었으며 pyrethrins+matrine+pyroligneous 가 약 95%의 방제가를, azadirachtin+rotenone 성분이 75% 이상의 방제효과를 보여주었다. 이중 pyrethrins 성분이 가장 좋은 효과를 주는 것으로 여겨지며 유기농업자재 살포로 인한 약해는 발생하지 않았다.

A sediment control dam is an artificial structure built to prolong sedimentation in the main dam by reducing the inflow of suspended solids. These dams can affect changes in dissolved organic matter (DOM) in the water body by changing the river flow regime. The main DOM component for Yeongju Dam sediment control of the Naeseongcheon River was analyzed through 3D excitation-emission matrix (EEM) and parallel factor (PARAFAC) analyses. As a result, four humic-like components (C1~C3, C5), and three proteins, tryptophan-like components (C2, C6~C7) were detected. Among DOM components, humic-like components (autochthonous: C1, allochthonous: C2~C3) were found to be dominant during the sampling period. The total amount of DOM components and the composition ratio of each component did not show a difference for each depth according to the amount of available light (100%, 12%, and 1%). Throughout the study period, the allochthonous organic matter was continuously decomposing and converting into autochthonous organic matter; the DOM indices (fluorescence index, humification index, and freshness index) indicated the dominance of autochthonous organic matter in the river. Considering the relative abundance of cyanobacteria and that the number of bacteria cells and rotifers increased as autochthonous organic matter increased, it was suggested that the algal bloom and consequent activation of the microbial food web was affected by the composition of DOM in the water body. Research on DOM characteristics is important not only for water quality management but also for understanding the cycling of matter through microbial food web activity.

2017년부터 2018년까지 전북지역 오디 생산용 뽕나무에 발생하는 주요 해충의 발생 양상과 유기농업자재에 의한 뽕나무이 방제 효과를 조사하였다. 부안과 익산지역을 중심으로 수확 전 발생하는 주요 해충은 뽕나무이, 미국흰불나방, 뽕나무명나방, 노린재류, 꽃매미 6종이었으며 수확 후에는 미국흰불나방, 뽕나무명나방, 총채벌레, 미국선녀벌레, 노린재류 등 5종이 발생하였다. 또한 오디 생산용 뽕나무 재배시 가장 문제가 되는 병해충인 균핵병과 뽕나무이를 동시에 친환경적으로 관리하기 위해서는 데리스 추출물(데리스 90%) 250배와 황토유황 500배를 혼합하여 처리하는 것이 방제효과 97.6%로 효과적이었다. 선발된 유기농업자재에 효과적인 처리시기는 4월 상·중순이며, 7일 간격으로 3회 방제하면 94% 이상의 방제효과가 있고 약해도 발생하지 않아 유기농업자재를 이용한 뽕나무이의 친환경방제가 가능할 것으로 판단되었다.