Chemistry for Sustainable Development 13 (2005) 603-610 Purification of Drainage Water from Dumps of Solid Household Wastes Using Calcium Oxide for Premembranous Treatment

Abstract Potentiality to use the process of treatment of drainage water from the dumps of solid household waste by calcium oxide as a method of premembranous preparation has been studied. The flow diagram has been developed for purification of drain age water with processing of the resulting slimes into marketable products. The suggested technology assumes the re-use of the obtained products in this technological process and their salvaging within other branches of the n ation al economy. Technological dependences of the variation in the baromembrane processes parameters after a prior reagent purification of drain age water from dumps have been obtained. Tests of a semiindustrial setup have been performed under field conditions

Characterization and Separation Performance of a Novel Polyethersulfone Membrane Blended with Acacia Gum

Novel polyethersulfone (PES) membranes blended with 0.1–3.0 wt. % of Acacia gum (AG) as a pore-former and antifouling agent were fabricated using phase inversion technique. The effect of AG on the pore-size, porosity, surface morphology, surface charge, hydrophilicity, and mechanical properties of PES/AG membranes was studied by scanning electron microscopy (SEM), Raman spectroscopy, contact angle and zeta potential measurements. The antifouling -properties of PES/AG membranes were evaluated using Escherichia coli bacteria and bovine serum albumine (BSA). The use of AG as an additive to PES membranes was found to increase the surface charge, hydrophilicity (by 20%), porosity (by 77%) and permeate flux (by about 130%). Moreover, PES/AG membranes demonstrated higher antifouling and tensile stress (by 31%) when compared to pure PES membranes. It was shown that the prepared PES/AG membranes efficiently removed lead ions from aqueous solutions. Both the sieving mechanism of the membrane and chelation of lead with AG macromolecules incorporated in the membrane matrix contributed to lead removal. The obtained results indicated that AG can be used as a novel pore-former, hydrophilizing and antifouling agent, as well as an enhancer to the mechanical and rejection properties of the PES membranes