Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
625400 | Desalination | 2010 | 9 Pages |
Abstract
Pesticide industry wastewater treatment combining nanofiltration (NF) and advanced oxidation process (AOP) using photo-Fenton's reagent was investigated in the laboratory. During the first stage of study, NF and AOP were used independently to treat malathion as a model substrate in pesticide industry wastewater (10Â mg/L) to produce high quality effluent (less than 0.1Â mg/L). Of the three types of NF membranes used (NF-A, NF90, and NF270), NF270 membrane has the largest water flux, but did not meet the desired effluent concentration of 0.1Â mg/L. NF90 and NF-A membranes could reduce the malathion concentration to 0.06Â mg/L, but provided a lower flux rate compared to NF270 membrane. AOP experiments were conducted at pH 3 to determine the optimum initial ratios of chemicals, which were malathion: H2O2Â =Â 1:100 and H2O2:Fe(II)Â =40:1. Experiments were also carried out at different initial malathion concentrations to determine the reaction time for the desired effluent under the optimum conditions. It took 1Â h, 2.25Â h and 3Â h to reduce the malathion from different initial concentrations (1, 10, and 33Â mg/L) to the desired level. During the second stage of study, a specific energy consumption was determined for each treatment scheme to evaluate the economic feasibility of the NF-AOP combination. AOP is the significant energy consumer in the combined process and hence should be minimized by enhancing NF.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Yanming Zhang, Krishna Pagilla,