致密的基质结构和短暂的水力滞留时间是造成处理效率偏低的主要原因。
The compact matrix structure and short hydrologic residence time result in the low treatment efficiency.
凤凰山水库2009年2月初发生局部微囊藻水华，主要原因是较好的水体稳定性（高水位，较长的水力滞留时间，较低的入库流量和降雨量），以及水温的迅速回升。
Microcystis-bloom in Fenghuangshan reservoir occurred in Feb. -2009, long water retention time, low precipitation and inflow, high temperature were the main reasons.
凤凰山水库2009年2月初发生局部微囊藻水华，主要原因是较好的水体稳定性（高水位，较长的水力滞留时间，较低的入库流量和降雨量），以及水温的迅速回升。
Microcystis-bloom in Fenghuangshan reservoir occurred in Feb. -2009, long water retention time, low precipitation and inflow, high temperature were the main reasons.
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