钝化剂投加对重污染湖湾围格中水质日变化的影响

在滇池重污染湖湾-福保湾-的现场围格中投加由铝盐、土和钙盐复合的钝化剂，研究围格中水质的日变化：投加钝化剂围格上覆水中总磷(TP)浓度日变化率为67%~90%，明显高于未投钝化剂围格(48%~53%)；投加钝化剂围格上覆水中总氮(TN)浓度日下降率为15%~28%，而未投钝化剂围格为-7%~-18%；投加钝化剂围格上覆水中浊度和叶绿素a日均变化率分别为62%和51%，均明显高于未投钝化剂围格浊度的日均变化率(43%)和叶绿素a日均变化率(35%)。综合分析了投加钝化剂对围格上覆水水质和氮形态迁移转化的影响，结果表明投加钝化剂的重污染围格的上覆水中的pH值和DO值升高，水体透明度改善，水体中藻类生物量和有机氮浓度降低，水质明显改善。

Effect of inactivation agent addition on diurnal variation of water quality in enclosures of heavy polluted bay

The diurnal variation rule of water qualities was illustrated in enclosures which were in heavy polluted Fubaowan Bay, Lake Dianchi. There were 2 enclosures without agent addition. While another 4 enclosures with inactivated agent addition, and the agent consisted of aluminium salts, calcium salts and clays. It was 67%～90% diurnal variation rate of total phosphorus （TP） of water in added inactivated agent enclosures apparently higher than the rate of undrugged enclosures which was 48%～53%. The day decreased rate of total nitrogen （TN）of water in added agent enclosures was 15% ～28% , but the decreased rate of undrugged enclosures was-7%～-18%.The averageday change rate of turbidness and chlorophyll a of agents addition enclosures was 62% and 51% respectively, which apparently were higher than that of enclosures without agents addition, in these enclosures, the turbidness averageday change rate was 43% and chlorophyll a averageday change rate was only 35%. Comprehensive analysis was made on the influence of inactivated agent addition on water quality and nitrogen transferring and translating. The results showed that in the enclosures with inactivated agent addition, the pH value and DO concentration were increased, the diaphaneity of overlying water was improved, the biomass of alga and concentration of organic nitrogen in the overlying water were decreased. The water qualities gained improving obviously.