生物滞留池内3种植物对四环素胁迫的响应  

RESPONSE OF THREE PLANTS TO TETRACYCLINE POLLUTION STRESS IN BIORETENTION CELL

作　　者：颜源 王亚军[1,2] 陈甜婧 安芳娇 YAN Yuan;WANG Yajun;CHEN Tianjing;AN Fangjiao(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《环境工程》2023年第8期65-74,共10页Environmental Engineering

基　　金：国家自然科学基金(41967043,52160003);甘肃省科技计划资助(20JR10RA145)。

摘　　要：为探究生物滞留池体系内(bioretention cell,BRC)植物对抗生素及氮、磷复合污染的响应,选用菖蒲(Acorus calamus)、虉草(Phalaris arundinacea)和芦苇(Phragmites communis)作为研究对象,在不同四环素(tetracycline,TC)浓度(0,0.1,0.6,1.2,1.8μg/mL)下进行间歇批次试验。检测TC、氮素、磷素复合污染物在植物体内的富集量及BRC系统出水中的浓度,考察污染物的富集转运及去除特征;分析有机酸的变化,探讨根系分泌物对复合污染的响应机制。结果表明:1)在TC胁迫下,植物对TC的富集能力为菖蒲>虉草>芦苇,3种植物氮、磷富集系数(bioconcerntration factors,BCF)均与TC浓度呈负相关,氮磷转运系数(translocation factors,TF)顺序为芦苇>虉草>菖蒲;无TC胁迫下,3种植物的氮BCF差异不显著,均在4.80~5.39,磷BCF差异显著且顺序为虉草>菖蒲>芦苇。2)3种植物BRC系统均可稳定高效去除TC,在0.1μg/mL TC时去除率接近99.70%,在0.6,1.2,1.8μg/mL TC时去除率均高于99.90%。TC胁迫时,菖蒲和芦苇BRC的总氮(TN)去除率均有下降,分别从73.15%、70.55%下降至最低为54.45%、47.70%,虉草BRC的TN去除率保持稳定在65%左右,菖蒲、虉草和芦苇BRC的TP去除率均明显增高,分别由75.53%、82.71%和78.64%升至最高为96.79%、98.80%和97.91%。3)TC胁迫下,3种植物柠檬酸分泌能力均增强,且菖蒲和虉草的柠檬酸分泌量与TC去除率呈显著正相关,芦苇的柠檬酸分泌量与TP去除率呈显著正相关,柠檬酸可作为外源有机酸提高植物BRC系统对TC、TP的去除。该研究结果对植物BRC去除抗生素污水的实际工程具有参考价值。To explore the response of plants in a bioretention cell(BRC)system to antibiotics and nitrogen and phosphorus compound pollution,Acorus calamus,Phalaris arundinacea and Phragmites communis was selected as the research objects.Intermittent batch tests were performed at different concentrations of tetracycline(TC)(0,0.1,0.6,1.2,1.8μg/mL)in the influent.The bioconcentration in plants and concentrations in the effluent containing tetracycline,nitrogen and phosphorus compound pollutants were tested,and the bioconcentration,translocation and removal characteristics of pollutants were investigated;the change of organic acid was analyzed,and the response mechanism of root secretion to compound pollution was discussed.The results showed that:1)with TC stress,the bioconcentration ability of plants to TC was in the order of Acorus calamus>Phalaris arundinacea>Phragmites communis.The bioconcentration factors(BCF)of nitrogen and phosphorus of the three plants were negatively correlated with TC concentration,and the translocation factors(TF)of nitrogen and phosphorus were in the order of Phragmites communis>Phalaris arundinacea>Acorus calamus.The difference in nitrogen BCF of the three plants without TC stress was not significant and ranged from 4.80 to 5.39,and there was a significant difference in phosphorus BCF,in the order of Phalaris arundinacea>Acorus calamus>Phragmites communis.2)The three plant BRC systems could remove TC stably and efficiently,with 0.1μg/mL of TC,the removal rate of TC was close to 99.70%;with 0.6,1.2,1.8μg/mL of TC,the removal rate of TC was higher than 99.90%.With TC stress,the total nitrogen(TN)removal rates of both Acorus calamus and Phragmites communis in BRC decreased respectively from 73.15%and 70.55%to a minimum of 54.45%and 47.70%,but the TN removal rate of Phalaris arundinacea in BRC remained stable at around 65%.The total phosphorus(TP)removal rate of Acorus calamus,Phalaris arundinacea and Phragmites communis in BRC increased significantly from 75.53%,82.71%and 78.64%to a maximum of 96

关 键 词：根系分泌物 有机酸 富集转运特征 菖蒲 虉草 芦苇 

分 类 号：X52[环境科学与工程—环境工程] X173