Abstract
Small amount of lauroyl glutamine was incorporated into HVI 350 mineral lubricating oil and the biodegradabilities of neat oil and the formulated oil in soils were evaluated. Thereafter, the biodegradation rate equations for the two lubricating oils were simulated based on the exponential model. The results indicated that lauroyl glutamine effectively promoted biodegradation of HVI 350 mineral lubricating oil. Under given test conditions, the exponential model well fitted the biodegradation of lubricating oils in soils. The biodegradation rate equation for HVI 350 mineral lubricating oil can be described as ln(St/S0) = –0.0155t, while that for the oil formulated with lauroyl glutamine as ln(St/S0) = –0.0235t. The biodegradation half-lives of neat oil and the formulated oils were 44.72 days and 29.50 days, respectively.
Highlights
It has been known that environmental pollution caused by petroleum-based lubricants is severe due to their inherent toxicity and non-biodegradable nature [1]
The results indicated that lauroyl glutamine effectively promoted biodegradation of HVI 350 mineral lubricating oil
The biodegradation rate equation for HVI 350 mineral lubricating oil can be described as ln(St/S0) = –0.0155t, while that for the oil formulated with lauroyl glutamine as ln(St/S0) = –0.0235t
Summary
It has been known that environmental pollution caused by petroleum-based lubricants is severe due to their inherent toxicity and non-biodegradable nature [1]. Even though choice of mineral base oils in biodegradable lubricant formulations has as far never been recommended, improvement of their environmental safety such as better biodegradability and development of greener additives are indispensable. Many amino acids have been known to be ready biodegradable and low eco-toxic, and have been described as being environmentally friendly. Amino acids such as lauroyl glutamine are known to be nutriments for microbes and, if incorporated into an unreadily biodegradable lubricant, are expected to be capable of promoting microbial production and increasing microbial populations, improving biodegradability of the lubricant.
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