Quick detection of iron in contaminated water before feeding to RO membranes

Abstract

This paper describes the need for detection of iron, preparation method of colorimetric material and response studies for detection of iron in contaminated water. Iron is a membrane foulant, and high concentration of it produces membrane fouling. Membrane fouling decreases the flux rate and efficiency of salt rejection and makes the membrane more susceptible to oxidation damage. Therefore, iron detection is essential in feed water before passing through RO membrane. Under this objective, a material was prepared through reaction of 1,10-phenanthroline with ascorbic acid and trisodium citrate (weight ratio 1:1:2). The prepared material shows significant response towards iron, and it is observed through naked eye. A yellow colour to change into orange red colour was observed within 5 min when material was exposed to Fe(II) ions at 300 µg/L as per IS 10500. UV-visible spectra of 1,10-phenanthroline-Fe complex show absorbance at wavelength 510 nm with iron without interference of other metal ions, viz. Cd(II), Co(II), Ni(II), Hg(II), Zn(II), Pb(II) and high TDS water.

Long-Term Performance of Ultrafiltration Membranes: Corrosion Fouling Aspect

“…As indicated above, the surface of the contaminated membranes was brown, indicating the presence of insoluble iron oxides [ 45 ]. During analysis, the deposit was dissolved by immersing the membrane sample in a 35% hydrochloric acid (HCl) solution.…”

Evaluation and Optimization of Treatment Technologies Treating Groundwater from the Arbuckle-Timbered Hills Aquifer in Oklahoma

“…Coagulation eliminated the majority of the total Fe, and remaining Fe ions were removed by media filtration and membrane filtration (Figure f). Although greensand filtration had a slightly better removal efficiency toward Fe, effluent from both media filter materials was compliant with the recommended total Fe concentrations (i.e., 0.05 ppm) in the feed stream of the membrane filtration process. , After Grsand filtration and membrane filtration at 90% recovery, the total Fe of NF permeate was 0.01 ± 0.00 mg/L, and the total Fe of BWRO permeate was at parts per billion levels (3 ± 2 ppb). After AA filtration and membrane filtration at 90% recovery, total Fe of NF permeate was 0.01 ± 0.01 mg/L, and total Fe of BWRO permeate was 0.01 ± 0.00 mg/L.…”