| Title |
Nutrient Removal in an Air - Lift Biofilm Reactor Using Waste Plastic Containers |
| Authors |
최의소 ; 박종복 ( Eui So Choi ; Jong Bok Park ) |
| Abstract |
This study was conducted to chracterize the nutrient removal aspects in an air lifted biofilm reactor using waste plastic as media. The air-lift biofilm reactor was operated with continuous and cyclic aeration at various hydraulic retention times and different temperatures. The media for the biofilm development was the waste plastic containers which has surface area and the void space of the plastic media used in this study were 76 ㎡/㎥ and 93%, respectively. Domestic sewage was introduced into the reactor, and BOD, TKN, and TP concentrations were 70 to 140, 14 to 22, and 3 to 4㎎/ℓ, respectively. The nitrogen removal efficiencies and nitrogen content of the sludge were 28.35 and 7%, respectively, with continuous aeration, and 50% and 9% with cyclic aeration. The nitrification and the denitrification rates were 4.3㎎ N/g·MLVSS·hr and 1.2㎎ NO₃-N/g·MLVSS·hr, respectively, at 26℃. It was estimated that sludge production was 0.19 to 0.27㎏ VSS/㎏ BODrm. Air backwashing seems to require every 60 days at the organic loading rate of 0.15 to 0.218 ㎏ BOD/㎥·d. The operating mean MLSS concentration was estimated to 4,200 ㎎/ℓ and SRT 47 to 75 days. |