A review on the interactions between engineered nanoparticles with extracellular and intracellular polymeric substances from wastewater treatment aggregates. (March 2019)

• Record Type: Journal Article
• Authors: Huangfu, Xiaoliu; Xu, Yanghui; Liu, Caihong; He, Qiang; Ma, Jun; Ma, Chengxue; Huang, Ruixing
• Is Part Of: Chemosphere. Volume 219(2019)
• Page Start: 766
• Page End: 783
• Publication Date: 2019-03
• Subjects: Engineered nanoparticles -- Wastewater treatment aggregates -- Extracellular polymeric substances -- Intracellular polymeric substances -- Interaction mechanisms; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.12.044
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Engineered nanoparticles (ENPs) will inevitably enter wastewater treatment plants (WWTPs) due to their widespread application; thus, it is necessary to study the migration and transformation of nanoparticles in sewage treatment systems. Extracellular polymeric substances (EPSs) such as polysaccharides, proteins, nucleic acids, humic acids and other polymers are polymers released by microorganisms under certain conditions. Intracellular polymeric substances (IPSs) are microbial substances contained in the body with compositions similar to those of extracellular polymers. In this review, we summarize the characteristics of EPSs and IPSs from sewage-collecting microbial aggregates containing pure bacteria, activated sludge, granular sludge and biofilms. We also further investigate the dissolution, adsorption, aggregation, deposition, oxidation and other chemical transformation processes of nanoparticles, such as metals, metal oxides, and nonmetallic oxides. In particular, the review deeply analyzes the migration and transformation mechanisms of nanoparticles in EPS and IPS matrices, including physical, chemical, biological interactions mechanisms. Moreover, various factors, such as ionic strength, ionic valence, pH, light, oxidation-reduction potential and dissolved oxygen, influencing the interaction mechanisms are discussed. In recent years, studies on the interactions between EPSs/IPSs and nanoparticles have gradually increased, but the mechanisms of these interactions are seldom explored. Therefore, developing a systematic understanding of the migration and transformation mechanisms of ENPs is significant. Graphical abstract: Image 1 Highlights: Comprehensive review on the physical, chemical and biological mechanisms for interactions between ENPs and EPSs/IPSs. The characteristics of EPSs/IPSs had been summarized. EPSs/IPSs influence the fate of ENPs in WWTPs. Critical factors impact the interactions between ENPs and EPSs/IPSs.