... of Water and Environment Technology, Vol.1, No.2, 2003 - 155 - BIOLOGICAL NITROGEN REMOVAL FOR LONG- TERM LANDFILL LEACHATE BY USING MLE PROCESS 1 Cho-Hee Yoon † , Seung-Hyun Kim and Jong-Choul ... Landfill Sites," JWPCF. 57(1), 30~38 3.Krug, M. N., Ham, R. K., (1997) "Analysis of Long- term Leachate Characteristics," SARDINIA 97, Sixth International Landfill Symposium, 117~131 ... the effect of recycle ratio on biological denitrification and nitrification rate based on the determined hydraulic loading rate. Ⅱ. Materials and Methods 1. Experimental Equipment Pilot scale...