期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 5, 页码 3352-3361出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c08101
关键词
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资金
- U.S. Department of Agriculture [2018-68011-28371]
- National Science Foundation [1936928]
- National Science Foundation-U.S. Department of Agriculture [2020-67021-31526]
- Directorate For Engineering
- Div Of Engineering Education and Centers [1936928] Funding Source: National Science Foundation
A novel thin-film composite polyamide membrane was designed for highly selective nanofiltration to remove micropollutants and preserve valuable nutrients in domestic wastewater. By tuning membrane pore size, distribution, and surface charge, it achieved desirable solute-solute selectivity. The study highlights the potential of designing solute-selective NF membranes for improved flexibility in wastewater treatment and resource recovery.
Domestic wastewater is a valuable reservoir of nutrients such as nitrogen and phosphorus. However, the presence of emerging micropollutants (EMPs) hinders its applications in resource recovery. In this study, we designed and fabricated a novel thin-film composite polyamide membrane, which enables highly selective nanofiltration (NF) that removes EMPs effectively while preserving valuable nutrients in the permeate. By incorporating polyethylenimine as an additional monomer to piperazine and surfactant sodium dodecyl sulfate in interfacial polymerization, we precisely tuned membrane pore size, pore size distribution, and surface charge. The resultant NF membrane achieved desirable solute-solute selectivity between EMPs (rejection rate > 75%) and nutrient N and P ions (rejection rate < 25%). By applying a modified Donnan steric pore model with dielectric exclusion, which takes membrane pore size distribution into consideration, we demonstrate the synergistic effect of membrane pore size, pore size distribution, and surface charge in regulating membrane solute-solute selectivity. Designing solute-solute selective NF membranes for fit-for-purpose wastewater treatment has great potential to improve the flexibility of membrane technologies that can convert wastewater streams to valuable water and nutrient resources.
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