风浪扰动对底泥内源磷钝化效果的影响

摘要

Wind effects on P control by two P inactivation agents (thermally-treated calcium-rich attapulgite and lanthanum modified bentonite (Phoslock) ) using Y-shaped sediment resuspension generation apparatus was studied. The results indicated that addition of P inactivation agents could solidify the surface sediment and reduce the erosion depth accordingly when suffer from frequent wind disturbance. Furthermore, the suspended particulate matter (SPM) and soluble reactive phosphorus (SRP) also could be reduced compared with control treatment. The forms of calcium bounded P and inert P were also increased with the addition of P inactivation agents. Strong wind increased sediment erosion depth, concentrations of SPM and SRP in overlying water and sediment mobile P content when compared with moderate wind disturbance. The percentage of calcium bounded P and inert P in sediment under the influence of strong wind was also reduced in comparison to moderate wind. This results indicated that even wind can exert great influence on sediment P inactivation while which still could be used in shallow eutrophic lake restoration.%利用Y型旋浆式沉积物再悬浮发生装置,模拟太湖常见风情条件下对两种底泥磷钝化剂(热改性富钙凹土与镧改性膨润土(商标Phoslock))控磷效果的影响.研究结果表明,与对照相比,底泥钝化剂的添加均可增强表层底泥的抗风浪扰动能力,降低了风浪对钝化层的侵蚀深度,减少了上覆水体中悬浮物的含量,且同时可降低上覆水体中可溶性活性磷(SRP)的浓度及可移动磷的含量,增加了惰性磷和钙磷的比例.与中风条件相比,大风条件增加了侵蚀深度?上覆水悬浮物含量?可溶解活性磷的浓度及可移动磷含量,降低了惰性磷和钙磷的比例.以上结果表明,虽然风浪扰动的剧烈程度对底泥磷钝化技术有影响,但底泥磷钝化技术依然可以应用于浅水富营养化湖泊内源磷的治理.