丁草胺胁迫下光催化对水生植物系统氮去除的恢复与强化效能研究  

Recovery and enhancement efficacy of photocatalysis on nitrogen uptake by aquatic plants systems under butachlor stress

作　　者：李硕 王沛芳[1,2] 石珍瑜 俞越明 饶磊[3] LI Shuo;WANG Peifang;SHI Zhenyu;YU Yueming;RAO Lei(College of Environment,Hohai University,Nanjing 210098;Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes of Ministry of Education,Hohai University,Nanjing 210098;College of Materials Science and Engineering,Hohai University,Nanjing 210098)

机构地区：[1]河海大学环境学院,南京210098 [2]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,南京210098 [3]河海大学材料科学与工程学院,南京210098

出　　处：《环境科学学报》2024年第6期141-150,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金创新研究群体项目(No.51421006);国家自然科学基金青年科学基金项目(No.42007342)。

摘　　要：农田退水中残留的丁草胺对湿地水生植物的生长具有显著的阻碍作用,从而导致湿地系统净化效能下降.为探究丁草胺胁迫下光催化对水生植物系统氮去除的恢复与强化,本文在丁草胺对以黄菖蒲为实验材料的水生植物系统氮的去除胁迫影响研究的基础上,开展了丁草胺胁迫下光催化协同水生植物复合系统氮去除效率研究,并讨论了光催化材料加入量、退水流量对水生植物系统氮去除恢复与强化的影响.结果表明,丁草胺会显著抑制水生植物系统对氮的去除,15 d后胁迫率达16.1%.但在光催化协同作用下,复合系统去除了近90%的丁草胺,胁迫率降低为0.6%,恢复了水生植物系统对氮的去除,并加速了氨氮的硝化,进一步强化了水生植物系统对氮的去除.随着光催化材料投加量的增加,总氮和氨氮的去除率升高,当光催化剂投加量由0.2%增加至1.5%时,水体总氮和氨氮去除率分别由84.3%和85.2%增加至94.7%和94.0%,但流量对复合系统氮去除能力的影响不显著.Residue of butachlor in farmland withdrawal water have a significant inhibitory effect on the growth of wetland aquatic plants,leading to a decrease in the purification efficiency of the wetland system.To investigate the recovery and enhancement of nitrogen removal capacity of aquatic plant system by photocatalysis under butachlor stress,in this paper,based on the study of the stress effects of butachlor on the nitrogen removal capacity of aquatic plant system,yellow calamus was introduced as experimental materials,and the nitrogen removal efficiency of photocatalytic synergistic aquatic plant composite system under butachlor stress was investigated.The effects of the photocatalytic materials dosage and the flow rate of the receding water on the recovery and enhancement of the nitrogen removal capacity of aquatic plant system were further discussed.Results showed that butachlor inhibited the nitrogen removal ability of the aquatic plant system significantly,with an inhibition rate of 16.1%after 15 d.However,under the synergistic effect of photocatalysis,nearly 90%of the butachlor was removed by the composite system,and the inhibition rate was reduced to 0.6%,which restored the nitrogen removal ability of the aquatic plant system.The nitrification of ammonia nitrogen was also accelerated,which further enhanced the removal of nitrogen by aquatic plant system.The removal rate of total nitrogen and ammonia nitrogen increased with the increase of photocatalytic material dosage,as the photocatalyst dosage increased from 0.2%to 1.5%,the removal rate of total nitrogen and ammonia nitrogen in the water body increased from 84.3%and 85.2%to 94.7%and 94.0%,respectively.But the flow rate did not have a significant effect on the nitrogen removal capacity of the composite system.

关 键 词：丁草胺 光催化 水生植物 农田退水 净污 

分 类 号：X703[环境科学与工程—环境工程]