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DOI : , Vol.20, No.6, 67 ~ 77, 2012
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| Title |
| Application of direct filtration for total phosphorus removal from secondary effluent of municipal wastewater treatment plant |
| 정종태 Jong Tai Jung , 조용현 Yong Hyun Cho , 한상윤 Sang Yun Han |
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| Abstract |
| This research investigated whether the combined process of direct filtration, coagulation/flocculation and up flow filtration with floating filter medium was an efficient treatment method for total phosphorus (T-P) removal from secondary effluent of municipal wastewater treatment plant. In coagulation/flocculation experiments, coagulants such as aluminum sulphate(Al₂(SO₄)₃), poly aluminum chloride (PACI), poly aluminum chloride silicate-2(PACS-2), ferric chloride(FeCl₃) were used to find out the optimum conditions for the removal of T-P, PO₄-P and turbidity by jar test. The optimum pH of coagulation was 6.0-6.5 and Al (Fe)/P mole ratio was 2.5-3.0. Although floc size of Al (lll) coagulants was bigger than FeCl₃, flocculation efficiency was not good enough, because of the low turbidity and very and very small particle size (under 10㎛). Also, in spite of increasing flocculation time from 10 to 30 min, growth of floc size was insufficient. As the result, 10 minutes of flocculation time was concluded the appropriate flocculation condition. 8.33m³/m² hr of the up flow filtration rate was found to removal over 8㎛ size particles effectively. The direct filtration showed the highest T-P removal efficiency of 91.9%. |
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| Key Words |
| Total phosphate removal, Coagulants, Floating media, Particle size, Direct filtration |
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