The Development of Filter for Environmental Improvement in Land Based Seawater Fish Farm II. Purification efficacy of Inlet and Outlet Seawater by Filter

필터의 개발을 통한 해수 육상수조식 양식장의 환경개선에 관한 연구 II. 필터 운행에 따른 유입수 및 배출수의 정화효과

This study was conducted to evaluate the purification efficacy by filter and ultra violet (UV) irradiation against inlet and outlet seawater of the land based fish farm. Purification efficacies for inlet seawater (50$\ell$/min) has been examined with filter of 60$\mu$m pore size and UV irradiation at an average dose 0.5 mWS/$cm^2$ for 5 months. For outlet seawater filter of 90 $\mu$m pore size only was used. Temperature, salinity, pH, $NO_3-N,\;NO_2-N,\;NH_4-N,\;PO_4-P$, DO and COD of inlet and outlet seawater in the system were not influenced. However, the removing rate of suspended solid and turbidity of inlet seawater were appeared to be $48.7\~65.6\%$ (average $51.9\%$) and $33/3\~42/5\%$ (average $34.8\%$) after passing through screen filter respectively. Also, germicidal efficiency to the total bacteris and Vibrio species were $16.7\~20.2\%$ (average $19.2\%$) $20.0\~21.9\%$ (average $20.9\%$) respectively after passing through UV irradiation. After passing through drum filter of 90$\mu$m pore size, suspended solid and turbidity of outlet seawater were appeared to be $42.7\~52.6\%$ (average $46.9\%$), $27.7\~29.9\%$ (average $28.3\%$), respectively.

육상 수조식 양식장의 유입수에 망목 60$\mu$m 스크린필터 및 조사량 0.5 mWS/$cm^2$ 자외선등, 배출수에 망목 90 $\mu$m 드럼필터를 설치$\cdot$운행하여 어류사육수조의 유입수와 배출수의 정화효과를 검토하였다. 유입 수에 60$\mu$m 스크린필터와 조사량 0.5 mWS/$cm^2$의 UV, 배출수에 90 $\mu$m 드럼필터의 설치$\cdot$운행에 따른 수온, 염분, $NO_3-N,\;NO_2-N,\;NH_4-N,\;PO_4-P$, DO 및 COD에 대한 정화효과는 인정되지 않았다. 그러나, 유입수에 60$\mu$m스크린필터의 설치$\cdot$운행에 의한 부유물질과 탁도는 각각 $48.7\~65.6\%$ (평균, $52.8\%$), $33.3\~42.5\%$ (평균, $35.9\%$)가 제거되었고, 조사량 0.5 mWS/$cm^2$의 UV의 설치$\cdot$운행에 따른 세균 및 비브리오 균수는 각각 $16.7\~20.2\%$ (평균, $19.2\%$), $20.0\~21.9\%$ (평균, $20.9\%$)가 살균되었다. 또한, 배출수에 90 $\mu$m 드럼필터의 설치에 따라 부유물질은 $42.7\~52.6\%$ (평균 $46.9\%$), 탁도는 $27.7\~29.9\%$ (평균 $28.3\%$)의 제거효율을 나타내었다.