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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.
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