Removal of fluoride from treated industrial wastewater using electrocoagulation with aluminum electrodes
Publish Year: 1388
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICAWTR01_047
تاریخ نمایه سازی: 20 اردیبهشت 1390
Abstract:
Electrocoagulation (EC) process using aluminum electrodes is proposed to remove fluoride from treated industrial wastewater originated from steel industry. Its efficacy is investigated under different conditions. Effects of temperature, pH, voltage, hydraulic retention time (HRT) and number of aluminum plates between anode and cathode plates on removal efficiency are investigated. Experimental results showed that by increasing HRT, removal efficiency increases but after 5 min changes are negligible. Therefore, the total HRT required is only 5 min. The more HRT, the more electrical current is needed in order to achieving constant voltage and temperature in system. In addition, it is found that pH value decreases within first 10 min from 6.91 to 4.6 but it increases up to The influent pH value is found to be a very important variable that affected effective defluoridation be achieved, but also no pH readjustment is needed after treatment. Moreover, increasing number of aluminum plates between anode and cathode plates in bipolar system does not significantly affect fluoride removal.
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Authors
V.K Kamal
Department of Civil and Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, Iran, P.O. Box: ۱۴۱۵۵-۶۱۳۵
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