Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Study on Water Environment and Benthic Macroinvertebrate Community in Reclaimed Wastewater Effluent Dominated Stream

하수처리수 방류 하천의 물환경과 저서성 대형무척추동물 군집 생태 연구

  • Son, Jung-Won (Busan Metropolitan City institute of Health & Environment) ;
  • Kwag, Jin-Suk (Busan Metropolitan City institute of Health & Environment) ;
  • Cho, Gab-Je (Busan Metropolitan City institute of Health & Environment) ;
  • Ryou, Dong-Choon (Busan Metropolitan City institute of Health & Environment)
  • 손정원 (부산광역시 보건환경연구원) ;
  • 곽진숙 (부산광역시 보건환경연구원) ;
  • 조갑제 (부산광역시 보건환경연구원) ;
  • 류동춘 (부산광역시 보건환경연구원)
  • Received : 2020.12.07
  • Accepted : 2021.05.24
  • Published : 2021.05.30
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Abstract

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.

Keywords

Acknowledgement

The authors are grateful to the Republic of Korea National Institute of Environmental Research (NIER) who funded the research reported in this paper.

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