A NUMERICAL MODEL FOR DENITRIFICATION OF MUNICIPAL LANDFILL LEACHATE AND PARAMETRIC ANALYSIS ON DENITRIFICATION CONTROLLING FACTORS
Author(s)
kOHJI MICHIOKU, KENJI TANAKA, HIROYA TANAKA, KOSUKE INOUE, TAMIHIRO NAKAMICHI, MASAHIRO YAGI, NARIAKI WADA
Abstract
In order to develop a new technology for denitrifying leachate by using fatty acid compounds (FAC), a water quality model was developed by considering balances of nitrogen, dissolved oxygen, carbon, phosphorus and denitrification bacteria involved in leachate denitrification. FAC is expected to function not only as a donor of hydrogen and carbon to nourish and activate denitrification bacteria but also as a reducer of nitrified leachate. Prior to the present study, performance of FAC for denitrifying leachate was confirmed in a laboratory experiment under various conditions of leachate loading discharge and nutrients. Time-dependent behaviours of water quality observed in the experiment were successfully reproduced by the model with high accuracy. The model also provides a solution of denitrification performance as a function of hydraulic retention time, HRT. The proposed water quality model is expected to be a useful engineering tool for planning, designing and constructing a cost-saving leachate treatment system.
Keywords
landfill leachate, denitrification, water quality model, numerical simulation
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