[논문]하수처리수 방류 하천의 물환경과 저서성 대형무척추동물 군집 생태 연구

손정원; 곽진숙; 조갑제; 류동춘

doi:10.15681/kswe.2021.37.3.190

[국내논문] 하수처리수 방류 하천의 물환경과 저서성 대형무척추동물 군집 생태 연구
A Study on Water Environment and Benthic Macroinvertebrate Community in Reclaimed Wastewater Effluent Dominated Stream 원문보기

한국물환경학회지 = Journal of Korean Society on Water Environment, v.37 no.3, 2021년, pp.190 - 203

손정원 (부산광역시 보건환경연구원) , 곽진숙 (부산광역시 보건환경연구원) , 조갑제 (부산광역시 보건환경연구원) , 류동춘 (부산광역시 보건환경연구원)

Abstract ▼ AI-Helper

Water quality, benthic macroinvertebrate communities, and other factors were investigated to explore the effects of the effluent discharge from a sewage treatment plant into Jwagwang stream in Busan in 2019. During the study period, the flow rate of this stream was in the range of 10,400 m3/day to 52,200 m3/day except for the discharge of about 24,000 m3/day of the effluent. After discharge, the flow velocity increased by about 65% and the water depth increased by about 40%. At sites downstream of the discharge point, BOD, COD, TOC, T-N, T-P, and other water quality values were worse than those of the upstream sites. The periphytic algal chlorophyll-a concentrations in the natural substrata were higher than those of the upstream sites, especially in May and August. However, at sites downstream of the discharge point, the individual numbers of Annelida were decreased and individual numbers of the insecta of arthropoda were increased. Also, species numbers and the diversity and dominance indexes were improved in the sites downstream of the discharge point. The functional feeding groups (FFGs) of collector-filterers were increased and the habitat orientation groups (HOGs) of sprawlers, burrowers, and clingers were especially increased at the sites with additional reclaimed wastewater effluent flow. Regardless of the effluent discharge, BMI, an indicator of ecological stream health using benthic macroinvertebrate species, did not show large gaps between the study points. Although the water quality of the sites downstream of the discharge point was much worse than those upstream, their ecosystem soundness was better than those of the upstream sites from an ecological perspective.

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표/그림 (18)

그림 Fig. 1. The map of the study sites.
그림 Fig. 2. Monthly rainfall variation in the study sites (Gigang-gun area).
그림 Fig. 3. Main treatment process in the Jeonggwan sewage treatment plant (DNR process).
표 Table 1. Ecological indices of benthic macroinvertebrates used in this study
표 Table 2. Annual average water quality of treated water in the Jeonggwan sewage treatment plant in 2018
그림 Fig. 4. Average daily effluent flow and its water quality in Jeonggwan sewage treatment plant (BECO, 2019).
표 Table 3. Measured flow, average water current, and average water depth of the study sites
그림 Fig. 5. Water quality of the study sites according to the location and time of sampling.
표 Table 4. The characteristics of the materials attached to stream bottom gravel in the study sites
그림 Fig. 6. Benthic macroinvertebrate community composition of the study sites (black numbers, total numbers of individuals; red numbers, total number of species).
표 Table 5. Species and individual numbers of functional feeding groups before and after treated effluent discharge
표 Table 6. Species and numbers of individuals in the habitat orientation groups before and after treated effluent discharge
표 Table 7. Important ecological features of increased benthic macroinvertebrates after treated effluent discharge
표 Table 8. Dominant and subdominant species (percentages in parentheses are the dominance rate of the species)
표 Table 9. The individulal numbers of collected species in this study
그림 Fig. 7. Ecological Indices of the study sites according to the location and time of sampling.
표 Table 10. Benthic Macroinvertebrate Index (BMI) of the study sites
표 Table 11. Pearson’s correlation of water current, water depth, water quality, and ecological indices

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