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AI Hafez*
KI El-nagar
NS Gerges
AI Hashem
SE Mohamed
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KI El-nagar
NS Gerges
AI Hashem
SE Mohamed
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Journal of Oil, Gas and Coal Engineering

Treatment of aged transformer oil using dry sludge in lab-scale refining unit

AI Hafez 1*, NS Gerges1, KI El-nagar2, SE Mohamed3, AI Hashem4

1* Central Chemical lab. Egyptian Electricity Transmission Company, Egypt.

2 National institute for standards, Egypt.

3 Egyptian Environmental Affairs Agency, Cairo, Egypt .

4 Chemistry Department, Faculty of Science, Ain-shams University, Cairo, Egypt.

Accepted 04 September, 2015

Citation: Hafez AI,  Gerges NS, El-nagar KI,  Mohamed SE, Hashem AI (2015). Treatment of Aged Transformer Oil Using Dry Sludge in Lab-Scale Refining Unit. Journal of Oil, Gas and Coal Engineering, 1(1): 002-014.

Copyright: © 2015 Hafez et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Experimental analysis of drinking water treatment sludge revealed that it is enriched with aluminum and silicon oxides which are the most metal oxides used in reclamation of transformer insulating oils. The potential use of inexpensive and available water treatment dry sludge as sorbent material for the removal of acidity, water content and some impurities from aged transformer oil by adsorption methodology was investigated using lab-scale refining unit. Dry sludge was found to improve the electrical and physical properties of aged transformer oils. High improvement of breakdown voltage occurs after using dry sludge reclaimed transformer oil and changed from 15 to 72 kV. Also some improvements have been achieved such as water content changed from 48 to 9 ppm and total acidity changed from 0.37 to 0.01mg KOH/g of oil. Viscosity, specific gravity were improved. Also, some undesirable gases in aged oil(more than ten years in service) were removed. Furthermore the use of dry sludge as sorbent material renders the treated oil to some extent like new one. Also Dry sludge is available at any water treatment plant with no costs (waste product). Environmentally, after sludge reclamation process for the used transformer oil, the sludge can be recycled by ignition and used in further treatment processes.

Keywords: Transformer oils, dry sludge, breakdown voltage, refining unit.     

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