摘要
采用传统气浮工艺(DAF)和改性气浮工艺(Posi-DAF),研究了两者对淡水环境中3种常见的MPs的去除行为。结果表明,传统DAF对MPs的去除效果有限,在0. 4~0. 5 MPa下取得32. 7%~48. 7%的最佳去除率,仅由亲/疏水作用作为主导机制时,微气泡(MBs)与MPs的黏附效果并不理想。采用2种气泡改性剂对MBs进行表面改性后,MPs去除率明显改善,并在PDADMAC投加量为0. 6~1. 0 mg/L时达到最佳,相比传统DAF增加了13. 6%~33. 7%,说明除亲/疏水作用以外,电荷吸引和扫描作用均产生了积极影响,后者的促进效果更为明显。
Removal of three kind of common microplastics( MPs) in freshwater by conventional dissolved air flotation( DAF) and positive modification DAF( Posi-DAF) process was investigated. The results showed that the optimal removal efficiency of MPs by conventional DAF was 32% ~ 38% at 0. 4 ~0. 5 MPa,which indicated that the adhesion between microbubbles( MBs) and MPs was not ideal when the hydrophilic/hydrophobic interaction was the dominant mechanism. However,the optimal removal efficiency of MPs was increased by 13. 6% ~ 33. 7% compared with that of conventional DAF after two surface modifiers were used on MBs and at a 0. 6 ~ 1. 0 mg/L dosage of PDADMAC. In addition to the hydrophilic/hydrophobic interaction,both charge attraction and sweeping had positive effects,and the latter was more obvious.
作者
田立平
李亚男
闫家磊
王永磊
丁路明
Tian Liping;Li Yanan;Yan Jialei;Wang Yonglei;Ding Luming(Weifang Municipal Public Utilities Management Office,Weifang 261041,China;College of Environmental and Municipal Engineering,Shandong Jianzhu University,Jinan 250101,China;Xintai Water Supply Co.Ltd.,Xintai 271200,China;Shandong Agricultural University,Taian 271018,China)
出处
《供水技术》
2020年第2期1-7,共7页
Water Technology
基金
潍坊市科学技术发展计划项目(2019ZJ1088)。
关键词
改性气浮
微塑料
微气泡
黏附机制
Posi-DAF
microplastics
microbubbles
interaction mechanism
