水力扰动下改性钙/铝基污泥抑制湖泊内源磷释放效果及机制
- Effects and mechanism of modified calcium/aluminum-based sludge on inhibiting endogenous phosphorus release from lakes under hydraulic disturbance
- 基金项目：国家自然科学基金(No.52300214);新疆维吾尔自治区—天池英才青年博士项目(No.CZ002305);石河子大学青年拔尖计划项目(No.BJZK202405);石河子大学高层次人才科研启动项目(No.RCZK202321);石河子大学2024年度国家大学生创新创业训练计划项目(No.202410759051)。
- 摘要：本研究旨在探究水力扰动下改性钙/铝基污泥(MCS)抑制浅水湖泊内源磷释放的效果及机制.结果表明煅烧后MCS孔体积及Al3+、Fe3+占比增大,对PO43--P吸附量较改性前增大2.55倍.较对照组, MCS覆盖可有效抑制底泥再悬浮, 保持较高上覆水DO的同时通过物理阻隔和絮凝显著降低浊度和COD(p<0.01).同时,试验组上覆水和间隙水磷浓度大幅下降,而水力扰动增大了MCS在底泥中的作用深度.此外,MCS诱导以Pseudomonas和Xanthomonas为代表的溶磷细菌丰度增大及碱性磷酸酶活性增强,促进有机磷水解并通过化学吸附实现底泥磷固定,从根本上抑制磷释放.总之,MCS通过物理-化学-生物作用耦合实现磷固定,投加量为10.0和15.0g的试验组较对照组TP下降83.59%和83.62%.因此,本研究有望为浅水湖泊磷削减和污泥资源化提供思路及参考.
- Abstract：The aim of this study was to investigate the effects and mechanism of modified calcium/aluminum-based sludge (MCS) on inhibiting endogenous phosphorus release from the shallow lake under hydraulic disturbance. The experimental results showed that the pore volume and Al3+/Fe3+proportion of MCS were increased after calcination, and the adsorption capacity of PO43?-P increased by 2.55 times compared with that before calcination. Compared with the control group, MCS coverage could effectively inhibit the sediment resuspension and maintain a higher DO concentration in the overlying water, while significantly reduce turbidity and COD with physical barriers and flocculation (p<0.01). At the same time, the phosphorus concentrations in the overlying water and interstitial water of the test groups decreased significantly, while the hydraulic disturbance increased the action depth of MCS in sediments. In addition, MCS induced an increase in the abundance of phosphorus-solubilizing bacteria, represented by Pseudomonas and Xanthomonas, enhanced alkaline phosphatase activity in sediments. In addition, MCS promoted the hydrolysis of organic phosphorus and realized the phosphorus immobilization in sediments through chemical adsorption, thus inhibiting endogenous phosphorus release fundamentally. In summary, MCS could achieve phosphorus immobilization in sediments through the coupling of physical-chemical-biological actions. Especially in the test groups with 10.0 and 15.0 g of MCS addition decreased TP by 83.59% and 83.62% in the overlying water,compared with the control group. Therefore, this study is expected to provide ideas and references for phosphorus reduction in shallow lakes and sludge utilization.
