But the conventional activated sludge process technology has some shortcomings: long water residence time, low processing power per unit area, large area reactor, sludge bulking and so on.
The reasons accountable for the decline of the fish resources are due to the low reproduction capacity and the long development time of the fish, overfishing and water pollution.
造成胭脂鱼资源下降的原因主要与其自身繁殖力低,发育时间长,以及过度捕捞和水域污染等因素有关。
3
Microcystis-bloom in Fenghuangshan reservoir occurred in Feb. -2009, long water retention time, low precipitation and inflow, high temperature were the main reasons.