摘要
为进一步提高多级土壤渗滤(MSL)系统对污染物的去除性能,通过对比不同形状土壤模块(方形结构和U形结构)的MSL系统,典型污染物去除率及微生物群落结构,探究生物炭对MSL系统污染物去除机理的影响.实验结果表明,在不同水力负荷下,生物炭可显著提高MSL系统对污染物的平均去除率(P<0.05),并表现出快速启动与抗冲击负荷能力,对COD_(Cr)、TP、NH_(3)-N、TN的平均去除率为87.74%、96.23%、97.65%、89.38%;U形结构可提高MSL系统对COD_(Cr)、TP、NH_(3)-N、TN的平均去除率,但与方形结构无显著性差异(P>0.05)(TP除外);生物炭提高了MSL系统中氨氧化细菌以及反硝化菌属的相对丰度,强化了系统对氨氮的去除;U形结构提高了亚硝酸盐氧化细菌的相对丰度,使脱氮过程更加顺利.因此,生物炭通过调节MSL系统的微生物群落结构特征、改善系统水分运动状态,增强了系统对典型污染物的去除能力与抗冲击负荷的能力.
To further improve the efficiency of multi-soil-layering(MSL)systems,the effects of biochar on the removal mechanism were investigated through the comparison of typical pollutant removal efficiencies and microbial community structure in MSLs with different shaped soil modules(square and U-shaped).The results showed that biochar could significantly improve the average removal rate of pollutants in MSLs(P<0.05)under different hydraulic loads,exhibiting fast start-up and shock load resistance.The average removal rates were 87.74%,96.23%,97.65%and 89.38%for COD_(Cr),TP,NH_(3)-N and TN.The U-shaped structure could improve the average removal rates of COD_(Cr),TP,NH_(3)-N,and TN,which was not significantly different from the square structure(P>0.05)(except TP).Biochar enhanced the removal of ammonia nitrogen by increasing the relative abundance of ammoniaoxidizing bacteria and denitrifying bacteria,and the denitrification became more smooth with a higher relative abundance of nitrite-oxidizing bacteria in U-shaped MSL system.Therefore,biochar enhanced the efficiencies and stability by regulating the structural characteristics of microbial communities and the waterflow in MSL systems.
作者
郑世界
张建强
何杨
杨淞淋
蒋梅
陶艺
ZHENG Shi-jie;ZHANG Jian-qiang;HE Yang;YANG Song-lin;JIANG Mei;TAO Yi(Department of Environmental Science and Engineering,Southwest Jiaotong University,Chengdu 611756,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第4期1696-1705,共10页
China Environmental Science
基金
四川省科技计划项目(2021YFG0280)
中央高校基本科研业务费专项资金资助项目(2682021CX064)。
关键词
多级土壤渗滤系统
生物炭
U形结构
微生物群落结构
multi-soil-layering system
biochar
U-shaped structure
microbial community structure