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The waste emulsion is the oily wastewater in high concentration discharged in steel rolling process and the key of treatment is demulsification. In this paper, the suitable demulsification methods are selected through experimental study as well as the experimental conditions of electrooxidation demulsification and chemical flocculation demulsification are selected. The results showed that the most suitable demulsification method was electrooxidation, its optimum current range was 2.0~3.8 A and optimum voltage range was 140~200 V; the optimum coagulant for chemical flocculation demulsification was polyaluminum chloride. When the quantity added to is 1.5 g/L and pH value is adjusted to 7~9, the chemical oxygen demand (COD) in waste emulsion reduces to less than 8 000 mg/L, oil content reduces to less than 1 000 mg/L and suspended solids reduces to less than 1 500 mg/L.
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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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