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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, Fe2O3, and Fe3O4 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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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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