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In a batch mode treatment process, which eveltrolyzes the wastewater after derivation of N-P crystal fromation and recovery, the characteristics of pollutant removal induced with the changes of loading rate and hydraulic retention time were studied. MgCI_(２) to PO_(４)^(３-) in influent was 1.3. When analyzing the average treatment efficiencies and removal characteristics obtained from four separate operations (Rum Ⅰ, Ⅱ, Ⅲ, Ⅳ), removal efficiencies of PO_(４)^(３-) was not function of its loading rate. Under a condition of sufficient aeration and Mg source provided, over 88％ of PO_(４)^(３-) was eliminated by the formation of MAP without any ? adjustment, in spite of loading rate variation. An optimum-loading rate of NH_(４)-N to achieve high removal efficiency was approximately 100g／㎥／d. Below that loading rate, the removal of NH_(４)-N was proportional to the loading rate into the system, and hence stable and high removal efficiency, over 90％, was achieved. However, when the loading rate increased over that rate, removal efficiency began to drop and fluctuate. Removal efficiency of TOCs was dependant upon the hydraulic retention time (r^(２)＝0.97), not upon the loading rate. Stable and high color removal (94％) was obtained with 2 das of HRT in electrolysis reactor.
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