Compared with historical data, the proportions of Oligochaete and Chironomid in Erhai Lake continued to increase, which implied that the organic pollution in the Lake was further intensified.
对比历史数据可知，洱海寡毛类和摇蚊科比例继续增加，表明湖泊有机污染进一步加重。
2
The presence of oligochaete does not have influence on the removal of COD and NH3-N, but it affects the removal of TP, and the removal of turbidity is affected by the quantity of oligochaete too.