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To solve the ageing problem of transformer insulation oil after the long-term operation, three composite materials, including glucose attapulgite (GLU-APT), starch attapulgite (AL-APT), and polydopamine attapulgite (PDA-APT), were designed and prepared. The structures of the composite materials were characterized by X-ray diffractor, field emission scanning electron microscopy, Raman spectrometer, Fourier transform infrared spectrometer, and N2 adsorption-desorption test. The results show that the decolorization and acid value reduction effects of the three composite materials on retired oil improves significantly compared to APT, among which the GLU-APT shows the best regeneration effect to retired oil. When the mass ratio of GLU-APT adsorbent and retired transformer oil is 1:2, the adsorption time is 2 h, and the adsorption temperature is 90℃, the decolorization rate of regenerated oil can reach 88.2%, and the acid value is reduced to 0.010 mgKOH/g, the adsorption efficiency can maintain 90% after 5 cycles of regeneration.
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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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