Removal of silver from wastewater using cross flow microfiltration

Abstract

Abstract. Removal of silver from wastewater was investigated using continuous cross flow microfiltration (MF) technique hollow fiber membranes with a pore size 0.2µm, with sorbent coated material Al 2 O 3 /SDSH 2 Dz particle size (8 µm). The coating investigated was dithizone (Diphenylthiocarbazone) in 0.005M ammonia solution. In the filtration of silver ion solutions, the effects of the permeate flow rate and cross flow velocity on the absorption of silver ion solutions, and since the pore size of membrane (=0.2 µm) is smaller then that of the (Al 2 O 3 ), no need to consider the variation of (Al 2 O 3 ).rejection as it can be considered to be 100%. The amount of silver absorbed into sorbent material Al 2 O 3 /SDSH 2 Dz was (25.35, 39.68 ppm) for the cross flown velocity of 5, 2.5 L/hr respectively, and were the results as function of permeate flow was (25.35, 39.68 ppm) for the velocity of 5, 2.5 L/hr respectively.

Removal of Silver (Ag) from Artificially Contaminated Soil Using Acetic Acid as Electrolyte with Electrokinetic Remediation

“…Therefore, the decontamination of silver contaminated sites is one of the most important technological challenges. Removal of silver from contaminated water has been reported by physical and chemical methods such as using precipitator reagents, e.g FeCl2, Ca(OH)2 and NaOH [7], modified chitosan resin [8], clay absorbent [9-10], concrete particle [11] and phytoremediation [12][13], cross-flow microfiltration [14]. However, for silver contaminated soil, maybe there is no effective method other than dig and dump for ex-situ system as it is commonly used to remove heavy metal from contaminated soil [15].…”

Synthesis and Binding Studies of a Novel Highly Selective Ag(I) Ligand

“…Common techniques employed for silver extraction include chemical precipitation, 6,7 membrane filtration, 8 ion exchange, 9 electrochemical treatment, 10,11 solid phase extraction/adsorption, 12,13 and liquid-liquid extraction. [14][15][16][17] Liquid-liquid extraction has found wide application due to the ability of the extractants to form stable complexes with the silver ion, 18 resulting in efficient extraction and ease of operation.…”