硝酸钙投量对景观水底泥锁磷及水中氮磷的影响  

Effect of Calcium Nitrate Dosage on Phosphorus Locking in Sediment and Concentration of N and P in Landscape Water

作　　者：范攀 王怡[1] 王文怀[1,2,3] 柴宝华 FAN Pan;WANG Yi;WANG Wen-huai;CHAI Bao-hua(School of Environmental and Municipal Engineerings Xi'an University of Architecture and Technology,Xi'an 710055,China;Shaanxi Key Laboratory of Environmental Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Northwest China Key Laboratory of Water Resource and Environment Ecology,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安建筑科技大学陕西省环境工程重点实验室,陕西西安710055 [3]西安建筑科技大学西北水资源与环境生态教育部重点实验室,陕西西安710055

出　　处：《中国给水排水》2019年第17期112-117,共6页China Water & Wastewater

基　　金：陕西省自然科学基础研究重点项目(2016JZ019)

摘　　要：通过49d的实验室静态试验,探索了硝酸钙投加量对模拟景观水中底泥锁磷及水质的影响。试验结果表明,硝酸钙可以有效降低上覆水及间隙水中的磷浓度,其最佳投加量为0.2gN/L湿泥,此时可控制底泥中磷释放并能够最大程度减轻其对上覆水中氮的影响。当硝酸钙投量达到0.6gN/L湿泥以上时,虽然能有效去除上覆水及间隙水中的磷,但会引起NOx^--N浓度过高的问题。同时,投加硝酸钙还会增加底泥中TN的含量。因此,使用硝酸钙可以有效锁定景观水底泥中的磷,从而控制上覆水中磷浓度的升高,试验中最佳的锁磷剂量为0.2gN/L湿泥。The effects of different calcium nitrate dosage on phosphorus locking in sediment and the concentration of nitrogen and phosphorus in simulated landscape water were investigated through 49 days of static laboratory test.The results showed that calcium nitrate could effectively reduce the phosphorus concentration in the overlying water and interstitial water.The optimal dosage of calcium nitrate was 0.2 gN/L-wet sediment(WS),which could inhibit phosphorus release from sediment and minimize its impact on nitrogen concentration in the overlying water.When the dosage of calcium nitrate was above 0.6 gN/L-WS,it could effectively remove phosphorus from the overlying water and interstitial water,but it would also cause the problem of high NOx^--N concentration.At the same time,calcium nitrate would increase the total nitrogen content in the sediment.Therefore,calcium nitrate could effectively lock phosphorus into the sediment and inhibit the increase of phosphorus concentradon in the landscape water.The optimal dosage of calcium nitrate in this experiment was 0.2 g N/L-WS.

关 键 词：硝酸钙 底泥 磷 氮 景观水 

分 类 号：TU992[建筑科学—市政工程]