Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Evaluation Methods for the Removal Efficiency of Physical Algal Removal Devices

물리적 녹조 제거 장치의 제거 효율 평가 방안

  • Received : 2023.08.30
  • Accepted : 2023.10.24
  • Published : 2023.12.31
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Abstract

In response to the periodic occurrence of cyanobacterial blooms in Korean freshwaters, various types of cyanobacteria removal technologies are being developed and implemented. Due to the differing principles behind these technologies, it is difficult to compare and evaluate their removal efficiencies. In this study, a standardized method for evaluating cyanobacteria removal efficiency was proposed by utilizing the results of removal operations using a mobile cyanobacteria removal device in the Seohwacheon area of Daechung Reservoir. During removal operations, the decrease in chlorophyll-a (chl-a) concentration (ΔChl-a) in the working area was calculated based on the amount of collected sludge, the efficiency rate, and the concentration of chl-a. Additionally, the required working days (WD) to reduce the chl-a concentration to 1 mg/m3 in the target area was calculated based on the area of the target zone, the maximum daily working area, and the efficiency rate. A method for calculating the cyanobacteria removal capacity was proposed based on the reduction rate of chl-a concentration in the water before and after the operation, the treatment capacity of the removal technology, and the water volume of the target area. The cyanobacteria removal capacity of the mobile cyanobacteria removal device used in this study was 6.64%/day (targeting the Seohwacheon area of Daechung Reservoir, approximately 500,000 m2), which was higher compared to other physical or physicochemical cyanobacteria removal technologies (0.02~4.72%/day). Utilizing the evaluation method of cyanobacteria removal efficiency presented in this study, it will be possible to compare and evaluate the cyanobacteria removal technologies currently being applied in Korea. This method could also be used to assess the performance and efficiency of physical or physicochemical combined cyanobacteria removal techniques in the "Guidelines for the Installation and Operation of Algae Removal Facilities and the Use of Algae Removal Agents" operated by the National Institute of Environmental Research.

국내 상수원에서 주기적으로 발생하는 녹조에 대응하기 위하여 다양한 종류의 녹조제거기술이 개발되어 적용 중이다. 이러한 기술들은 녹조제거 원리가 다르기 때문에 이들의 제거 효율을 비교·평가하기는 어렵다. 본 연구에서는 대청호 서화천 수역에서 이동식 녹조제거장치를 사용하여 제거 작업을 시행한 결과를 활용하여, 녹조제거 효율을 평가할 수 있는 표준화된 방법을 제안하였다. 녹조 제거 작업시 수거된 슬러지의 양, 함수율, 클로로필-a의 농도로부터 작업 구간 중 클로로필-a의 농도 감소량(ΔChl-a)을 계산하였다. 또한 작업 대상 수역의 면적, 일일 최대 작업 면적과 ΔChl-a로부터 대상 수역에서 1 mg/m3의 클로로필-a 농도를 저감하는데 필요한 작업일수(WD)를 계산하였다. 작업 전후 수체에서 클로로필-a의 농도 저감율, 제거 기술의 처리 용량, 작업 대상 수역의 수체 용량으로부터 녹조제거능을 계산하는 방법을 제안하였다. 본 연구에서 사용된 이동식 녹조제거장치의 녹조제거능은 6.64%/day (대청호 서화천 수역 대상, 약 500,000 m2)이었으며, 이는 다른 물리·화학적 녹조제거 기술의 녹조제거능(0.02~4.72%/day)에 비해 높은 것으로 나타났다. 본 연구에서 제시한 조류제거효율 평가 방법을 활용하여 국내에서 적용되고 있는 녹조제거 기술의 비교 평가가 가능할 것이며, 국립환경과학원이 운영하고 있는 「조류제거시설 설치·운영 및 살포용 조류제거물질 사용지침」에서 물리적 또는 물리·화학적 복합 조류제거기법의 조류제거 성능 및 제거 효율 평가를 판정하는 방법으로 활용이 가능할 것으로 판단된다.

Keywords

Acknowledgement

이 논문은 충북대학교 국립대학육성사업(2022) 지원을 받아 작성되었으며, 이에 감사드립니다.

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