Experimental Study on Treatment of Arsenic Containing Wastewater from Copper Smelting by Iron-Carbon Micro-electrolysis
The iron-carbon(Fe-C)micro-electrolysis was adopted to treat arsenic-containing wastewater from copper smelting,and the effects of processing parameters,including pH of inlet water,air blowing rate,contacting time,vibration frequency,solid-liquid ratio(mass ratio of Fe-C micro-electrolysis material to inlet water per minute),on the arsenic removal efficiency were explored.Results show that during the treatment by Fe-C micro-electrolysis,the generated oxides such as FeAsO4,Fe2 O3,and Fe3 O4 are deposited on the surface of the Fe-C micro-electrolysis material,making passivation of the Fe-C micro-electrolysis material ineffective,thus resulting in poor arsenic removal efficiency.The use of vibration can effectively solve such problem.It is shown that after 90 d continuous treatment under the conditions,including pH of inlet water at 2.0,air blowing rate at 5 L/min,contacting time of 2 min,solid-liquid ratio of 2.5∶1,vibration frequency rate at 2 min every 4 h,the arsenic removal rate can be up to 99.99%and the arsenic content in water falls down to 0.033-0.036 mg/L,presenting a good and stable removal effect.It is concluded that this arsenic removal approach by adopting Fe-C micro-electrolysis can provide a new idea for treatment of arsenic-containing wastewater from copper smelting.
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