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Ade Syafrinaldi


Emulsified oil is considered as rarely acceptable waste oil to be reused or even recycled. Efforts that
have been made in the last 40 years for the development of reliable and efficient demulsification
techniques, cannot avoid the hard fact that it is not an easy task to break the most emulsified oil in short
times. For economic and operational reasons, it is necessary to separate the water from the emulsified
oil to an acceptable level before it fed into the reclaimed fuel oil plant. One of the most widely used
methods in treating water-in-oil emulsions is using surfactant to accelerate the emulsion breaking
process. Three commonly used surfactants with high HLB value (Nonyl Phenol Ethoxylate NP-9,
Tween 80 and Sodium Dodecyl Sulphate SDS), dissolved in toluene to form 25% solution, were
applied into 100 ml emulsified waste lubricants originated from collectors in Balikpapan suburb. The
demulsifying effects of all three surfactants were then examined, including the heat effect by warming
up the whole system. All experiments were carried out in different concentrations of each solution, 500
ppm, 700 ppm, 900 ppm and 1100 ppm. The performance level was determined by the amount of water
separated. The experiments continued using best performed surfactants and centrifugal separators to
meet the targetted water content in the waste lubricants by 5% and sediment content by 3% before it
fed into the reclaimed fuel oil plant. Result showed that surfactants with the best demulsifying effect
were NP-9 and SDS. Both worked at the optimum concentration of 700 ppm. The targetted water
content was successfully exceeded. Water content in the waste lubricants was reduced from 34% to
0.08% with NP-9 and to 0.8% with SDS. Sediment content was however not as successful. Sediment
content in waste oil was reduced from 12.30% to only 6.56% with NP-9 and to only 5.11% with SDS.
The removed water from the process needs further treatment before disposal. The concentration of
BOD 5, COD, oil and fat, and ammonia are beyond the quality standard of waste water. The waste
water passed only in pH, Dissolved Sulfide and Total Phenol.
Keywords : surfactant, emulsion, demulsification effect, demulsifier solution, hydrophilic lipophilic

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How to Cite
Syafrinaldi, A. (2020). PENGGUNAAN SURFAKTAN UNTUK MENGURANGI KANDUNGAN AIR DALAM EMULSI MINYAK. Jurnal Energi Dan Lingkungan (Enerlink), 13(2).