TREATMENT OF WASTEWATER IN PLATING INDUSTRY BY CHELATE EXTRACTION METHOD

One of the most efficient methods to preserve environment is the procedure and method to achieveeffective materials and the dual and reappl ication of natural sources. in this research , after carrying out avast study on the growing spot of iranian oaks , of the 36 species and subspecies already identified, 10species and subspecies were selected as they cove r a vaster surface of iranian woods in north alborzregion, arsabaran region and the western part of zagros mountains. 5 samples were collected of each typeform diffrenet spots of the country . the effective and usable substances of oak fruit were extracted andisolated by the four method s of maceration, decoction, perculation and soxhlet tannin in one specie showno significant differenc e; however the amount of tannin in different speci es show significant differences instatistical term in such a way that the minimum and maximum tannin was found in q.brantii, belangri with9.7% tannin and q.mac rantera, with 3.2 perc ent tannin. this amount was put in contact with wastewatervarious from plating industries in 20 to 50 mg/l amount. the mention ed wastewaters contained 50 to 750mg/l heavy metals (chromium, nickel, zinc, copper and silver) . the results were analyzed through abiofactor variance analysis model with repetition in each house (toki) results showed that the removaloutput for zinc, copp er, nickel and chromium without considering the initial concentration of the metalwere 91 to 95 percent, 7 1 to 83.5 percent, 59 to 90 percent, and 84 to 85 percent, respectively. also, withrepect to the studies carried out with different methods and compar ing the percentage of metals removal itwas concluded that the removals output through applying 50 mg/l. hydroxide calcium along with 50 mg/ltannin with 82.3 percent ave rage had the most effects in entire metals.