토양컬럼을 이용한 도금공장 유출수의 질소와 인 제거

Abstract

A laboratory experiment was performed to investigate the removal of nitrogen and phosphorus from plating factory effluent using the soil column. Soil, wasted oyster shell and denitrifying activated sludge were used as a supporting media of the soil column. The experimental results were obtained as follows. In the nitrification experiment, removal efficiencies of NH₄-N were 74.5%, 83.7%, 88.6% for the soil column packed with soil, waste oyster shell(10% ~ 20%) at HRT of 48 hours, respectively. The addition of 20% of waste oyster shell to the soil accelerated nitrification in the soil column. The number of nitrifiers was approximately in a level of about 4.9 × 105 MPN/g ㆍ soil(Ammonia-oxidizing bacteria number) in the soil column mixed with waste oyster shell(20%). The T-P removal was obtained 29.7%, 32.1%, 34.5% in the nitrification soil column packed with only soil, waste oyster shell(10%), and waste oyster shell(20%), respectively. In the denitrification experiment, removal efficiencies of T-N were 63.2%, 71.2%, 74.2% for the soil column packed with soil, denitrifying activated sludge(10%) and denitrifying activated sludge(20%) at HRT of 72 hours, respectively. The addition of 20% of denitrifying activated sludge to the soil accelerated denitrification in the soil column. The number of denitrifiers was approximately in a level of about 4.9 × 106 MPN/g ㆍ soil(Denitrification bacteria number) in the soil column mixed with denitrifying activated sludge(20%). The T-P removal was obtained 41.9%, 40.2%, 39.1% in the denitrification soil column packed with only soil, denitrifying activated sludge(10%), and denitrifying activated sludge(20%), respectively. In the continued experiment, the T-N removal was 81.4% and 77.8% at 72 and 48 hours of HRT and the T-P removal was 85% and 31.7% at 72 and 48 hours of HRT in soil column, respectively. The simultaneous removal of ammonia nitrogen and organic matter occurred in soil column.