邻苯二甲酸酯存在对人工湿地除污效果的影响

Effect of phthalic acid esters on pollutant-removing efficiency of horizontal subsurface flow constructed wetlands

本文以水环境中广泛存在的特征污染物邻苯二甲酸二丁酯(DBP)和邻苯二甲酸二辛酯(DOP)为研究对象,考察了人工湿地对DBP和DOP的去除规律及二者存在对湿地系统除污效果的影响,并通过芦苇生长特性分析探索了DBP和DOP影响人工湿地系统除污效果的内在机制.结果表明:DBP和DOP存在下,湿地系统对COD去除率可分别提高10%~15%和8%~18%;二者存在对氨氮去除具有抑制作用,去除率分别降低3%~9%和5%~10%;芦苇生长受PAEs的影响,可吸收DBP但几乎不吸收DOP.DBP促进芦苇生物量增加1.95倍,DOP抑制芦苇生物量减少1.48倍;芦苇床人工湿地对DOP去除率维持在88%左右,DBP去除率可高达92%.

Dioctyl phthalate（DOP）and dibutyl phthalate（DBP）were used in the present work to explore their effect on the removal of pollutants and removing rules of DOP/DBP in horizontal subsurface flow constructed wetlands.Mechanism of pollutant-removal by Phragmites australis was examined.DBP and DOP were found to increase the removal rate of COD by 10%~15%and 8%~18%respectively.But DBP and DOP decreased the removal rate of ammonium by 3% ~9% and 5% ~10% respectively.Phragmites australis absorbed DBP but hardly any DOP;its biomass could increase 1.95 times under the influence of DBP;DOP was found to decrease Phragmites australis biomass by 1.48 times.Importantly,constructed wetlands could remove 88% DOP and 92% DBP.