复合人工湿地对有机污染物的去除效果初步研究

研究了由不同植物配置(驯化和未驯化)的两组下行和上行植物床组成的复合人工湿地对生活污水的净化效果。结果表明,CODCr和BOD5的去除率达67.3%,68.1%,总氮(TN)的去除率为26.9%,总磷(TP)的去除主要发生在上行床,去除率为81.6%。环芳烃(PAHs)中苊(Ace)、荧蒽(Flu)、芘(Py)、苯并a]蒽(BaA)、屈(Chr)、苯并b]荧蒽(BbF)、苯并a]芘(BaP)、茚并1,2,3-cd]芘(InP)和苯并g,h,i](BPR)经下行床后,去除率超过80%,上行床去除较少。驯化床和未驯化床对PAHs的去除效果差异不显著。邻苯二甲酸酯(PAEs)中邻苯二甲酸二乙酯(DEP)和邻苯二甲酸二异丁酯(DiBP)经驯化床后,质量浓度显著升高,经未驯化床后邻苯二甲酸二(2-乙基)己酯(DEHP)含量显著降低。蚕豆根尖微核实验表明,不同植物配置对微核率影响差异并不显著,毒害物质经下行床后大部分被去除。

Removal of organic pollutants in combined artificial wetland

A combined artificial wetland was built to treat the wastewater of urban domestic sewage. Two types of plant beds, namely plant-tamed bed and plant-untamed bed, were incorporated into the wetland, and each bed had a vertical down-flowing bed and a vertical up-flowing bed. The results demonstrated that 67.3% of CODCr, 68.1% of BOD5, 26.9% of TN and 81.6% of TP were re- moved after wetland treatment, and TP was removed mainly in up-flowing beds. More than 80% of acenaphthene(Ace), fluoranthene (Flu), pyrene (Py), benzoa]anthracene (BaA), chrysene (Chr), benzob]fluoranthene (BbF), benzoa]pyrene (BaP), in- deno1,2,3-cd]pyrene (InP) and benzog,h,i]perylene (BPR) were removed in down-flowing beds, with little further removal in the following up-flowing beds. There was no significant difference for removal of PAHs between plant-tamed beds and plant-untamed beds. Diethyl phthalate (DEP) and diisobutyl phthalate (DiBP) increased significantly in plant-tamed beds, and bis (2-ethyihexyl) phthalate (DEHP) decreased significantly in plant-untamed beds. The MCN test also showed that there was no significant difference of MCN frequency between plant-tamed beds and plant-untamed beds. Total toxic organic pollutants were mainly removed in down-flowing beds.