垃圾渗沥液中氨氮的电化学氧化

Electrochemical oxidation of ammonium-N in landfill leachate.

针对目前国内外垃圾渗沥液处理中存在的问题，采用电化学氧化与上流式厌氧污泥床（ＵＡＳＢ）相结合，研究建立了对香港垃圾渗沥液的二步法处理工艺．本文着重探讨了电化学间接氧化去除渗沥液中氨氮的反应机制及主要影响因素，并通过实验找出了最佳的操作条件：入水初始 ｐＨ值为 ９．０；流速为 ０．０１－０．１０ ｃｍ／ｓ；ＣＩ加入量 ２０００ｍｇ／Ｌ；电流密度 ３２．３ｍＡ／ｃｍ~２．在此条件下，经过 ６ｈ电解后，ＵＡＳＢ反应器出水中ＮＨ_３－Ｎ和ＣＯＤ的去除率分别达到１００％和８７％．对该电化学氧化过程的运行成本进行了评估．

Aimed at the problem of treating landfill leachate at home and abroad, this study was conducted to develop a two-stage process for the treatment of Hong Kong landfill leachate, by using the process combination of UASB (up-flow anaerobic sludge blanket) and electrochemical oxidation. It emphasized on the reaction mechanism and affecting factors of the process to remove indirectly the ammonia-N in the landfill leachate; and found out through experiment the optimum condition of the process (initial pH 9.0;flow velocity 0.01--0.10 cm/s;2000mg/L chloride added; current density 32.3mA/cm^2). Under the condition up to 100% of NH_3-N and 87% of COD were removed from the UASB effluent in 6h electrochemical oxidation. The operation cost of the electrochemical oxidation process was evaluated.