微生物对太湖微囊藻的好氧降解研究

STUDY ON THE AEROBIC DECOMPOSITION OF MICROCYSTIS IN TAIHU LAKE

通过模拟实验研究了微生物对微囊藻残体（主要为铜绿微囊藻和水华微囊藻）的降解作用。水体内悬浮质和各主要形态磷浓度的变化结果表明:微囊藻的好氧分解符合一级动力学,其悬浮质和颗粒性磷的浓度呈指数关系递减,降解速度分别为 0.227/d和0.088/d。经32d降解后,水体内的总溶解磷（TDP）可达总磷（TP）的53％,而 TDP的主要成分为PO_4^(3-)。因此,微囊藻的微生物好氧降解对湖泊水质和营养盐的循环,特别是PO_4^(3-)释放引起的二次污染不容忽视。

The model experiment of aerobic decomposition of Microcystis spp. (mainly including M. aeruginosa, M. flosaquae) in Taihu Lake was studied. The results show: the decomposition can be approximated by first-order kinetics. The particulate matter and concentration of partiele phosphorus are decreased exponentially. The rates of decomposition are 0.227d-1 and 0. 088d-1, respectively. After 32 days, experiment, the total dissolved phosphorus (TDP) accounts for 53% of total phosphorus (TP), and phosphate (PO43-) is the main component of TDP. During the aerobic decomposition of Microcystis, the water quality and the cycling of nutrient, especially the release of PO43- may not be overlooked.