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순환여과양식 시스템 기반 인공 조제 배출수의 고분자 응집제 및 오존 처리 후 수질 변화
운성천(Sungchun WOON),김지훈(Jihoon KIM),임도형(Dohyung LIM),박정환(Jeonghwan PARK) 한국수산해양교육학회 2024 水産海洋敎育硏究 Vol.36 No.2
As the demand for environmentally friendly aquaculture systems increases, it is essential to establish effective treatment methods for wastewater produced. Accordingly, an evaluation was conducted on the water quality changes resulting from the treatment of wastewater from recirculating aquaculture systems using polymeric flocculants and ozone. The flocculant was introduced into the wastewater at concentrations of 2-10 μL/g TSS, followed by ozone treatment of the supernatant after flocculant treatment at ozone loads of 12.5-300 mg O3/g TSS. The study observed differences in particulate matter and water quality concentrations based on the levels of flocculant treatment, with the most effective treatment noted at a condition of 4 μL/g TSS of the flocculant. Moreover, the size of particulate matter in the treated wastewater was mostly above 100 μm, indicating significant potential to enhance the performance of physical filtration systems, especially when considering the typical pore size of such systems. The ozone treatment showed the most efficient results under conditions of 37.5 mg O3/g TSS, suggesting that a combined approach of filtration using polymeric coagulants and geotextile bags, along with ozone treatment, could be applied as an eco-friendly means of wastewater treatment, minimizing pollution loads to the external environment.
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고분자 응집제를 이용한 반순환여과양식시스템의 배출수 내 고형물 응집 효율 및 입도 분포
서준혁,운성천,김지수,박정환 한국수산과학회 2022 한국수산과학회지 Vol.55 No.1
Interest in effluent treatment is currently increasing and the use of polymetric coagulants is considered as a pretreatment of physical filtration prior to effluent discharge to increase solids recovery. A jar test evaluated effluent treatment efficiency of polymeric coagulants for semi-recirculating aquaculture systems. The particle coagulation efficiency and distribution were evaluated at different polymer dosages in freshwater and seawater effluents. The polymer was added at 0.005-0.08 mL/g of total suspended solids (TSS) in the effluents. TSS in the supernatant after coagulation decreased with increasing polymer dose in the freshwater, while showing no corresponding changes with dose in the seawater. However, in all treatments for both effluents, the removal efficiency was above 90%, regardless of the dose in the tested range. Both the De Brouckere Mean Diameter (DBMD) and volumetric median diameter (VMD) were all above 100 μm in the freshwater effluent. In the seawater effluent, the particle size appeared to be larger than that in freshwater, ranging from 400-1,000 μm for both DBMD and VMD. Considering that the typical pore size of physical filtration in aquaculture is between 60 and 200 μm, the use of polymers is expected to improve the practicality of physical filtration for efficient treatment.
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