The effect of co-occurring inorganic solutes on the removal of arsenic (V) from water using cationic surfactant micelles and an ultrafiltration membrane

摘要: Abstract The effect of co-occurring inorganic solutes existence in feed water on the removal arsenic (V) and permeate flux was investigated for treatment process using a cationic surfactant cetylpyridinium chloride (CPC) 5 kilo-Dalton (kDa) polyethersulfone (PES) membrane. Simulated well (Washoe County STMGID #9 operational well, Nevada) were used this study. concentrations ([As]F = 0−105 μg/L) ([HCO−3] 0−4.1 mg/L, [HPO2−4] 0−0.3 [H4SiO4] 0−90 [SO2−4] 0−400 mg/L) simulated varied. pH level adjusted to 8 since around 8. concentration 73 μg/L. carbonate, phosphate, silicate, sulfate 1 0.17 69 8.2 respectively. PES membrane without micelles found be ineffective removal. highest presence is 25%, corresponding 30 μg/L which above new maximum contaminant (MCL) 10 With addition mM CPC water, efficiency significantly increased ranging between 78.1% 100%. dependent solute concentrations. Except one UF experiment performed with containing 105 400 mg/L SO2−4 (23 water), all other experiments produced below MCL. HCO−3, HPO2−4, H4SiO4 species does not affect (100%) except case (99% 90 H4SiO4). result almost 100% (arsenic detection limit ICP-MS, μg/L). Furthermore, absolute also co-occuring An increase results decrease flux. For arsenic, 56.5 ± 2.5% ultra clean reduces further as or total dissolved solid increases. It 43.5 3.5%, 45.5 7.5%, 6.5%, 37.5 5.5% species, 33% Only 1.52 0.33% molecules detected water. Surfactants can separated reused stream.