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Armor-Structured Interconnected-Porous Membranes for Corrosion-Resistant and Highly Permeable Waste Ammonium Resource Recycling
journal contributionposted on 2022-04-26, 15:05 authored by Dongqing Liu, Fuyun Yu, Lingling Zhong, Tao Zhang, Ying Xu, Yingjie Qin, Jun Ma, Wei Wang
Ammonium recovery from wastewater by gas-permeable membranes is promising but suffers from the tradeoff between membrane stability and permeability under harsh operating conditions. Chemical-resistant membranes display modest permeability due to the poor solubility and processibility; chemically active membranes are easier to be endowed with better permeability however hinder by instability. To resolve such a problem, we cleverly design a novel membrane configuration via one-step solution-electrospinning, with the chemical-active component (low-strength fluorine polymer) as the inner skeleton to construct interconnected porous structures and the chemical-resistant component (high-strength fluorine polymer) as the outer armor to serve as a protective layer. Due to the significantly enhanced mass transfer coefficient, the interconnected-porous armor-structured membrane exhibited much higher permeability for NH4+-N recovery, which was 1.4 and 5 times that of the traditional PTFE membrane and PP membrane, respectively. Through long-term intermittent and consecutive experiments, the reusability and durability of the armor-structured nanofibrous membrane were verified. When treating actual hoggery wastewater with complicated water quality, the armor-structured nanofibrous membrane also displayed robust stable performance with excellent antiwettability. The mechanisms of membrane formation, corrosion resistance, and mass transfer were discussed in detail.
strength fluorine polymerharsh operating conditionscomplicated water qualitytraditional ptfe membranestructured nanofibrous membranechemically active membranesactive componentpp membranemembrane stabilitymembrane formationporous membranespermeable membranesterm intermittentstructured interconnectedstep solutionprotective layerpoor solubilitymass transferinner skeletonexcellent antiwettabilityconsecutive experimentscleverly design5 times