The removal efficiency and mechanism of microplastic enhancement by positive modification dissolved air flotation.
MP-MB interaction
Posi-DAF
microplastics
Journal
Water environment research : a research publication of the Water Environment Federation
ISSN: 1554-7531
Titre abrégé: Water Environ Res
Pays: United States
ID NLM: 9886167
Informations de publication
Date de publication:
May 2021
May 2021
Historique:
revised:
21
03
2020
received:
01
02
2020
accepted:
26
04
2020
pubmed:
5
5
2020
medline:
12
5
2021
entrez:
5
5
2020
Statut:
ppublish
Résumé
Microplastics (MPs) are widely distributed in freshwater and have the following characteristics: small size, strong hydrophobicity, difficult degradation, and easy adsorption of toxic substances. These characteristics pose a potential threat to the environment and human health. In this paper, three common MPs in freshwater were removed by conventional dissolved air flotation (DAF) and positive modification DAF (Posi-DAF). The results showed that the optimal removal efficiency of MPs by conventional DAF was 32%-38% at 0.4-0.5 MPa. This indicated that the adhesion between microbubbles (MBs) and MPs was not ideal when the hydrophilic/hydrophobic interaction was the dominant mechanism. However, the 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. This result indicated that in addition to the hydrophilic/hydrophobic interaction, both charge attraction and sweeping had positive effects. PRACTITIONER POINTS: The removal efficiency and mechanism of MPs by posi-DAF were investigated. The characteristics, particle number, and adhesion of microplastics were measured. Conventional DAF was dominated by hydrophilic/hydrophobic interactions. CTAB Posi-DAF was dominated by charge attraction. PDADMAC Posi-DAF was dominated by charge attraction and sweeping.
Substances chimiques
Microplastics
0
Plastics
0
Water Pollutants, Chemical
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
693-702Subventions
Organisme : Natural Science Foundation of Shandong Province
ID : ZR2016EEM32
Organisme : Science and Technology Development Plan of Weifang
ID : 2019ZJ1088
Informations de copyright
© 2020 Water Environment Federation.
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