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김종민 ( Jong Min Kim ),안병용 ( Byeung Yong Ahn ),김승호 ( Seung Ho Kim ),김동수 ( Dong Soo Kim ),김연희 ( Yun Hee Kim ),최영섭 ( Yeong Seop Choi ),윤상훈 ( Sang Hoon Yoon ),배석진 ( Seok Jin Bae ),조영관 ( Young Gwan Cho ),김은 한국환경분석학회 2014 환경분석과 독성보건 Vol.17 No.2
This study was conducted to assess removal efficiency and develop improvement plans for a T-P treatment plant in the 1st sewage treatment plant in Gwangju. The findings of this study are as follows: among all processes, the T-P removal process achieved the highest efficiency (84%), whereas the T-N removal process showed the lowest (1.2%). About 77% of the 84% T-P removal efficiency was credited to the sedimentation basin, indicating that coagulant injection is essential. Comparing coagulants using jar tests found that the optimal PAC input was 20~25 ppm and its T-P removal efficiency was 94~95%, whereas the optimal LAS input was 25~30 ppm with T-P removal efficiencies of 84~89%. This shows that PAC can achieve a better removal efficiency than LAS. Although the jar tests suggested the best PAC input of 20~25 ppm, the actual input at the plant was 28~36 ppm, about 8~11 ppm higher. This may be attributable to the significantly shortened retention time in the sedimentation basin due to the high-rate coagulation of an inclination plate settler using micros and. The degrees of coagulation by rapid mixing were measured, and zeta potentials were found moderate ranging between -8.44~-8.40 mV. This indicates that a pump injection method should be adopted for the best coagulation (zeta potential: 0~+3 mV). Replacing the four existing rapid-mixing coagulant injectors (power consumption: 85.6 kW/h) with one device using pump injection (power consumption: 1.5 kW/h) may not only improve T-P removal efficiency but also reduce the annual electricity cost by 60 million won.
김연희 ( Yun Hee Kim ),김종민 ( Jong Min Kim ),송형명 ( Hyung Myung Song ),김승호 ( Seung Ho Kim ),안병용 ( Byeung Yong Ahn ),강영주 ( Yeong Ju Kang ),김은선 ( Eun Sun Kim ),김동수 ( Dong Soo Kim ) 한국환경분석학회 2013 환경분석과 독성보건 Vol.16 No.2
This study was performed to perceive environmental pollution in children`s playground in Gwangju metropolitan city. Two types of sand and synthetic rubber as flooring material were used in children`s playground. The sampling was collected from 20 sites in sand flooring material and 21 sites in synthetic rubber flooring material. They are measured to evaluate pH, heavy metals, and parasite eggs in sites of sand flooring material and also to heavy metals in sites of synthetic rubber floor material. In site of sand flooring material, pH range was from 5.8 to 8.8. The average concentration of Pb, As, Hg, Cd, and Cr6+ was 16.318, 0.343, 0.048, 0.258, and 0.000 in unit mg/kg, respectively. In site of synthetic rubber flooring material. The average value of the total sum concentration of heavy metals such as Pb, As, Hg, Cd, and Cr6+ was 70.427 mg/kg. This total concentration of heavy metals was even much lower than that of criteria (1,000 mg/kg). The parasite eggs were not found in sites of sand flooring material. Therefore, it showed that all sites in children`s playground was safe environmentally.