好氧及厌氧/好氧序批式工艺中磷化氢的释放

摘要

采用二次冷阱富集-气相色谱法作为磷化氢的检测方法,以高纯氮吹脱取样的方式,对好氧序批式工艺及厌氧/好氧序批式工艺中磷化氢的存在及其在工艺中的变化规律进行了研究。结果表明,两种工艺中均检测到磷化氢的存在。好氧序批式工艺中,磷化氢呈递减趋势,运行后期可间断性的检测到低水平（〈0.4 ng/L）磷化氢。厌氧/好氧序批式工艺中,厌氧阶段的磷化氢检测值呈上升趋势;进入好氧阶段,磷化氢检测值迅速降低,后期仍有较低水平（2.96～6.86 ng/L）的稳定产出。%With twice preconcentration and gas chromatography-NPD as detection method of phosphine,aeration stripping by high purity nitrogen as sampling mode,research on existence of phosphine and its variation rules in aerobic sequencing reactor process and anaerobic/aerobic sequencing reactor process was conducted.The results indicated that phosphine can be detected in the two processes.In aerobic sequencing batch reactor,phosphine showed decreasing trend and was detected in a low level（0.4 ng/L） intermittently in later period.In anaerobic/aerobic sequencing batch reactor,phosphine in anaerobic phase showed accumulation tendency;when entering the aerobic phase its detection value decreased rapidly,but it still produced stably in a lower level（2.96~6.86 ng/L） in later period.