Application of Microorganisms to the Processing and Upgrading of Crude Oil and Fractions

Ayala, Marcela; Vázquez-Duhalt, Rafael; Morales, M.; Borgne, Sylvie Le

doi:10.1007/978-3-319-31421-1_205-1

Cited by 5 publications

(1 citation statement)

References 131 publications

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“…To improve degradation efficiency, it is necessary to obtain high‐efficiency decomposition micro‐organisms (Ayala et al . 2017; Varjani 2017). The results showed that the ability of these micro‐organisms to promote degradation is improved by step‐by‐step domestication.…”

Section: Discussionmentioning

confidence: 99%

Enhancing anaerobic degradation of oily sludge using subcritical hydrothermal pretreatment

Lin

2020

J Appl Microbiol

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Aims Oily sludge is a kind of mixture that is extremely harmful to the environment. Anaerobic digestion (AD) is a commonly used method for biodegrading oily sludge. However, the AD treatment cycle is usually long and inefficient. Here, we developed an approach to improve the degradation rate of oily sludge by integrating subcritical hydrothermal pretreatment (SHP) and AD. Methods and Results First, using SHP, the hydrocarbon compounds with long carbon chains that make up oil sludge were decomposed into hydrocarbons with short carbon chains, which are conducive to microbial decomposition and transformation. Then, AD was performed using a variety of temperature and solid–liquid ratio parameters. The results showed that the degradation ratio of oily sludge was higher when SHP was combined with AD than when no pre‐treatment was performed. Optimal degradation was reached by performing SHP to obtain CHS8, then performing AD at 30°C using a 1:5 solid–liquid ratio. Under these conditions, maximum degradation ratios of 69·00% of TOC, 59·02% of COD, 44·68% of ammonia and 54·24% of oil content were reached. Conclusions In conclusion, after SHP with 8% dilute sulphuric acid, most of the macromolecular hydrocarbons in the oily sludge were converted into smaller molecules, which facilitated subsequent microbial decomposition. The results showed that this combination of SHP and AD processes promotes more efficient degradation than a conventional single AD process without any hydrothermal pretreatment. Significance and Impact of the Study Our experiments provide technical support for enhancing the rapid degradation of oily sludge.

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Section: Discussionmentioning

confidence: 99%