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Enhancing anaerobic degradation of oily sludge using subcritical hydrothermal pretreatment
Su, H.1,2; Lin, J.3
2020-11-06
摘要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 degrees C using a 1:5 solid-liquid ratio. Under these conditions, maximum degradation ratios of 69 center dot 00% of TOC, 59 center dot 02% of COD, 44 center dot 68% of ammonia and 54 center dot 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.
关键词activated sludge anaerobic degradation oily sludge subcritical hydrothermal pretreatment
DOI10.1111/jam.14748
发表期刊JOURNAL OF APPLIED MICROBIOLOGY
ISSN1364-5072
页码10
通讯作者Su, H.(suhaifeng@cigit.ac.cn) ; Lin, J.(linjiafu@cdu.edu.cn)
收录类别SCI
WOS记录号WOS:000587024600001
语种英语