A PRE- AND POST-DENITRIFICATION SYSTEM TREATING A VERY HIGH AMMONIA LANDFILL LEACHATE: EFFECTS OF pH CHANGE ON PROCESS PERFORMANCE

摘要

The prime objective of this research was to investigate the nitrogen removal capabilities of a pre- and post-denitrification process, when treating landfill leachate containing an ammonia concentration of over 2200 mg N l~-1. The treatment system. Also known as a 4-Stage Bardenpho process, was operated with an external recycle ratio of 3:1 and an internal recycle ratio Of 4:1. The first anoxic reactor actual hydraulic retention time was 1.5 hours, while the first aerobic retention time was 3 hours.