Removal of Fe(II) from the wastewater of a galvanized pipe manufacturing industry by adsorption onto bentonite clay.
Bentonite clay has been used for the adsorption of Fe(II) from aqueous solutions over a concentration range of 80-200 mg/l, shaking time of 1-60 min, adsorbent dosage from 0.02 to 2 g and pH of 3. The process of uptake follows both the Langmuir and Freundlich isotherm models and also the first-order kinetics. The maximum removal (>98%) was observed at pH of 3 with initial concentration of 100 mg/l and 0.5 g of bentonite. The efficiency of Fe(II) removal was also tested using wastewater from a galvanized pipe manufacturing industry. More than 90% of Fe(II) can be effectively removed from the wastewater by using 2.0 g of the bentonite. The effect of cations (i.e. zinc, manganese, lead, cadmium, nickel, cobalt, chromium and copper) on the removal of Fe(II) was studied in the concentration range of 10-500 mg/l. All the added cations reduced the adsorption of Fe(II) at high concentrations except Zn. Column studies have also been carried out using a certain concentration of wastewater. More than 99% recovery has been achieved by using 5 g of the bentonite with 3M nitric acid solution.
Tahir
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Central Laboratory for Environmental Analysis, Pakistan Environmental Protection Agency, Islamabad, Pakistan.
Rauf
Naseem
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D000327:Adsorption; D000538:Aluminum Silicates; D001546:Bentonite / Q000737:chemistry*; D000077215:Clay; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000302:isolation & purification*; D008420:Manufactured Materials; D019216:Metals, Heavy / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods*
D000538:Aluminum Silicates; D007220:Industrial Waste; D019216:Metals, Heavy; D001546:Bentonite; D007501:Iron; D000077215:Clay