生物炭覆盖处理对受污染河流沉积物中氮磷释放的阻控作用  

Inhibition and control of nitrogen and phosphorus release from polluted river sediments by biochar mulching

作　　者：齐国翠 许仁智 刘旭辉 曾亭婷 黄秀棉 QI Guocui;XU Renzhi;LIU Xuhui;ZENG Tingting;HUANG Xiumian(Guangxi Colleges Key Laboratory of Erploitation and Utilization of Microbial and Botanical Resources/College of Chemical and Biological Engineering,Hechi University,Yizhou 546300,China;College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]河池学院化学与生物工程学院/微生物及植物开发利用广西高校重点实验室,广西宜州546300 [2]桂林理工大学环境科学与工程学院,广西桂林541004

出　　处：《扬州大学学报（农业与生命科学版）》2023年第5期49-56,共8页Journal of Yangzhou University：Agricultural and Life Science Edition

基　　金：广西高校中青年教师基础能力提升项目(2017KY0578);河池学院高层次人才科研启动费项目(2019GCC007、XJ2018GKQ015);河池学院校级科研项目(2020XJZC003)。

摘　　要：为明确生物炭覆盖对污染河流沉积物中氮磷释放的阻控效果,选取宜州本地甘蔗制糖尾渣为原料制备甘蔗渣生物炭(BBC),通过室内覆盖试验,研究不同BBC覆盖量对本地矿区受污染河流沉积物中氨氮、硝态氮和总磷释放的阻控作用,并建立释放动力学模型。结果表明:BBC覆盖处理对沉积物中氨氮、硝态氮和总磷阻控效率随覆盖量增加而提高。覆盖量为0.5 kg·m^(-2)时对氨氮、硝态氮和总磷释放阻控效率均超过50%,覆盖量为1.0 kg·m^(-2)时增至最大,分别达到78.98%、74.23%和63.91%。试验建立了氮磷释放动力学模型,R~2均大于0.8,能较满意地反映BBC覆盖处理沉积物中氨氮、硝态氮和总磷的释放动力学特征。以上结果说明在一定条件下BBC覆盖对沉积物中氮磷的释放有较好的阻控作用。In order to explore the inhibition efficiency of nitrogen and phosphorus releasing from the contaminated river sediment by employing a biochar mulching treatment, this study selected the YiZhou local sugar tailings as the raw material to prepare the bagasse biochar(BBC), and researched the inhibition efficiency of releasing the ammonia, nitrate, and phosphorus under different BBC mulching conditions. In addition, the release dynamics of pollutants was investigated. The experimental results indicated that the inhibition efficiency on the release of ammonia, nitrate and phosphorus was increased with the BBC mulching amount. When the amount reached 0.5 kg·m^(-2), all the inhibition efficiency was more than 50%. When the amount was 1.0 kg·m^(-2), the inhibition efficiency reached maximum, which were 78.98%, 74.23% and 63.91%, respectively. And all the release kinetic model were perfectly investigated with high correlation coefficients, R~2> 0.8, which could satisfactorily reflect the release kinetic characteristics of ammonia, nitrate and phosphorus in the sediments treated by BBC mulching. All the above results showed that BBC mulching had a significant inhibition efficiency on the release of nitrogen and phosphorus from sediments.

关 键 词：河流沉积物 氮磷释放 甘蔗渣生物炭 阻控效率 释放动力学 

分 类 号：X522[环境科学与工程—环境工程]