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[求助] 表面流人工湿地氨氮出水浓度高于入水浓度

本人最近在做人工湿地,表面流人工湿地,采用沉水植物水葫芦作为湿地植物,用葡萄糖做碳源COD=500mg/L,氨氮为200ppm,采用蠕动泵连续泵水,开始时氨氮有降解,但是现在出水氨氮高于进水端,但是COD有下降,在入水口每1小时曝气2分钟。在前两周的水质pH低于6,是不是由于pH以及植物生长败落导致出水浓度比进水的高?
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