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Lehigh University

Environmental Engineering

Arsenic

Publication Year

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Full-Text Articles in Engineering

Hybrid Anion Exchange Nanotechnology (Haix-Nano) For Concurrent Trace Contaminant Removal With Partial Desalination: Laboratory And Field-Scale Investigations, Michael Scott German Jan 2017

Hybrid Anion Exchange Nanotechnology (Haix-Nano) For Concurrent Trace Contaminant Removal With Partial Desalination: Laboratory And Field-Scale Investigations, Michael Scott German

Theses and Dissertations

Millions of people across the Indian subcontinent are at risk of chronic exposure to arsenic and fluoride in aquifers with excess TDS (>500 mg/L). Hybrid anion exchange resins with nanoparticles of zirconium oxide (HAIX-NanoZr) were created for effective fluoride removal; zirconium oxide selectively bound fluoride, silica, and phosphate. The zeta potential of HAIX-NanoZr was directly correlated to the fluoride removal capacity. Thus, to increase fluoride capacity and achieve partial desalination concurrently, a weak acid cation (WAC) exchange pretreatment was used to lower alkalinity, hardness, pH, and TDS. Consistent partial desalination (~50%) occurred in proportion to influent alkalinity and hardness ...


Development Of Hybrid Polymeric/ Inorganic Ion Exchanger: Preparation, Characterization, And Environmental Applications, Surapol Padungthon Jan 2013

Development Of Hybrid Polymeric/ Inorganic Ion Exchanger: Preparation, Characterization, And Environmental Applications, Surapol Padungthon

Theses and Dissertations

The study involves the development of two environmental applications using hybrid polymeric/ inorganic ion exchangers. First, the hybrid polymeric ion exchangers supported hydrated zirconium oxide (HZO) nanoparticles, referred to as HIX-Zr were developed for selective removal of heavy metals and anionic ligands. Second, salt-free water softening processes were presented using three different heterogeneous cation exchanger resins along with novel regeneration schemes. The HIX-Zr nanosorbents have been prepared, characterized, and extensively studied in relation to heavy metal (i.e., zinc) and anionic ligand (i.e., arsenate and fluoride) removal in fixed-bed processes at trace concentrations with the presence of high concentrations ...