Perchlorate Removal using Sewage in a Fixed Biofilm Reactor

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The purpose of this research was to investigate whether domestic sewage as carbon substrates and nutrients can be used to reduce perchlorate in biological perchlorate treatment system. A fixed biofilm reactor was used to reduce perchlorate in sewage containing 4.41~7.65 mg/L perchlorate at various EBCT conditions such as 8hours, 4hours, and 2hours. 4.41 mg/L of perchlorate was reduced to 0.02 mg/L of perchorate which means 99.5% of perchlorate removal efficiency at 4hours of EBCT in a fixed biofilm reactor. Perchlorate and nitrate in sewage were reduced simultaneously at 4hours of EBCT in a fixed biofilm reactor. However, perchlorate removal efficiency decreased slightly in the presence of nitrate at 4hours EBCT in a fixed biofilm reactor compared to the previous experiment result in the absence of nitrate.