Abstract
Different contents of lauroyl glycine were incorporated into HVI 350 mineral lubricating oil and the biodegradabilities of the formulated oils were evaluated on a biodegradation tester. Thereafter, the interaction affections of four influencing factors, viz. lubricating oil content, lauroyl glycine, microbe nutriments and oxygen supply, on biodegradation of HVI 350 lubricating oil in soils were studied based on a L9(3 4 ) orthogonal array test . The results indicated that lauroyl glycine obviously promoted biodegradation of HVI 350 lubricating oil, especially at the lauroyl glycine contents of about 1.0~1.5%. Of the four influencing factors, the effect of lauroyl glycine on biodegradation of HVI 350 lubricating oil in soils proved to be the most significant in various biodegradation durations, demonstrating that lauroyl glycine markedly contributed to the biodegradation of the lubricating oil.
Highlights
It has been known that environmental pollution caused by petroleum-based lubricants is severe due to their inherent toxicity and non-biodegradable nature
The development of alternatives to conventional lubricant additives such as zinc dialkyldithiophosphate (ZDDP) has been a subject of significant interest, mainly due to environmental concerns arising from S, P and metal atoms of the additives
Biodegradability Index (BDI), a comparative parameter of the percentage ratio of the amount of CO2 created by individual tested lubricant to that created by oleic acid, was introduced to evaluate the biodegradability of the lubricant
Summary
It has been known that environmental pollution caused by petroleum-based lubricants is severe due to their inherent toxicity and non-biodegradable nature The key issue in formulating biodegradable lubricants is the choice of reliable base oils and suitable performance additives. Many base fluids such as vegetable oils and synthetic esters have found practical applications in the formulation of biodegradable lubricants because of their excellent biodegradability and non-toxicity Petroleum-based lubricants, which consist predominantly of hydrocarbons and subsidiarily of additives which are often environmentally hazardous, are for many reasons still dominating the lubricant market of today and will presumably continue to play their important roles in the future lubrication applications. Even though choice of mineral base oils in biodegradable lubricant formulations has as far never been recommended, improvement of ISSN 1913-1844 E-ISSN 1913-1852 www.ccsenet.org/mas their environmental safety such as better biodegradability is indispensable, from both technical and environmental points of view. A question occurs: can the biodegradability of unreadily biodegradable lubricants be enhanced, by formulating so-called ‘biodegradation accelerants’?
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