Impact of hydrothermal pre-treatment on the anaerobic digestion of different solid–liquid ratio sludges and kinetic analysis

Gong, Limin; Yang, Xiaoqi; Wang, Zaizhao; Zhou, Jun; You, Xiaogang

doi:10.1039/c9ra01662g

Cited by 35 publications

(22 citation statements)

References 52 publications

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“…Consequently, targeted fermentation product from microbial process is improved considerably. [ 37 ] Furthermore, ABE fermentation of pretreated algal biomass ( Gracilaria tenuistip ) by Low‐HTP under the R 0 lower than 2.07 could obviously provide satisfy either ABE or butanol production yield.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, targeted fermentation product from microbial process is improved considerably. [37] Furthermore, ABE fermentation of pretreated algal biomass (Gracilaria TA B L E 4 Production by Gracilaria tenuistipitata under low-HTP. −1 ] T e m p [ As can be seen from our results, C. beijerinckii did not use all the sugars; hence, it could only produce a small amount of butanol.…”

Section: S/l Ratio [G Lmentioning

confidence: 99%

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Potential of butanol production from Thailand marine macroalgae using Clostridium beijerinckii ATCC 10132‐based ABE fermentation

Khaonuan

Jariyaboon

Usmanbaha

et al. 2023

Biotechnology Journal

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The economical bio‐butanol‐based fermentation process is mainly limited by the high price of first‐generation biomass, which is an intensive cost for the pretreatment of second‐generation biomass. As third‐generation biomass, marine macroalgae could be potentially advantageous for conversion to clean and renewable bio‐butanol through acetone‐butanol‐ethanol (ABE) fermentation. In this study, butanol production from three macroalgae species (Gracilaria tenuistipitata, Ulva intestinalis, and Rhizoclonium sp.) by Clostridium beijerinckii ATCC 10132 was assessed comparatively. The enriched C beijerinckii ATCC 10132 inoculum produced a high butanol concentration of 14.07 g L−1 using 60 g L−1 of glucose. Among the three marine seaweed species, G. tenuistipitata exhibited the highest potential for butanol production (1.38 g L−1). Under the 16 conditions designed using the Taguchi method for low‐temperature hydrothermal pretreatment (HTP) of G. tenuistipitata, the maximum reducing sugar yield rate of 57.6% and ABE yield of 19.87% were achieved at a solid to liquid (S/L) ratio of 120, temperature of 110°C, and holding time of 10 min (Severity factor, R0 1.29). In addition, pretreated G. tenuistipitata could be converted to 3.1 g L−1 of butanol using low‐HTP at an S/L ratio of 50 g L−1, temperature of 80°C (R0 0.11), and holding time of 5 min.

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Section: Resultsmentioning

confidence: 99%

“…Consequently, targeted fermentation product from microbial process is improved considerably. [37] Furthermore, ABE fermentation of pretreated algal biomass (Gracilaria TA B L E 4 Production by Gracilaria tenuistipitata under low-HTP. −1 ] T e m p [ As can be seen from our results, C. beijerinckii did not use all the sugars; hence, it could only produce a small amount of butanol.…”

Section: S/l Ratio [G Lmentioning

confidence: 99%

Potential of butanol production from Thailand marine macroalgae using Clostridium beijerinckii ATCC 10132‐based ABE fermentation

Khaonuan

Jariyaboon

Usmanbaha

et al. 2023

Biotechnology Journal

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“…2013; Gong et al . 2019). This parameter has also been optimized in attempts to decompose oily sludge (Xu et al .…”

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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“…For PsNPs exposure experiments, 150 μg/L PsNPs were prepared and added to the PS with different TS% (4, 8, and 12%). According to the literature, recent studies examining the impact of TS% on THP efficiency selected 2–15% as their appropriate operating TS content. , Thereby, the TS content in this range was selected. As reported in a previous study, 150 μg/L PsNPs could have a more detrimental effect on AD than 50 and 100 μg/L .…”

Section: Methodsmentioning

confidence: 99%

“…Numerous studies previously emphasized the significance of TS% on the efficiency of the THP process in terms of solubilization and its subsequent impact on AD . For instance, Gong et al found that the THP of sludge with 8% TS was the most advantageous among different TS% (5, 8, 10, 12, and 15%), resulting in the highest levels of sludge disintegration and methane production . Similarly, Li and Chen found that 6% TS was the most effective within a wide range of TS% (2 to 12%) in enhancing THP efficiency regarding sludge solubilization and methane production .…”

Section: Introductionmentioning

confidence: 99%

Sludge Thermal Hydrolysis for Mitigating Oxidative Stress of Polystyrene Nanoplastics in Anaerobic Digestion: Significance of the Solids Content

Azizi

Zakaria

Haffiez

et al. 2023

ACS Sustainable Chem. Eng.

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Microplastics and nanoplastics (MPs/NPs) have been extensively detected in sewage sludge. They inevitably transfer to anaerobic digestion (AD) used for sludge processing and induce oxidative stress on the anaerobic microbiome. The thermal hydrolysis process (THP) is a widely implemented sludge pretreatment process to boost methane generation and solids reduction in AD. Although few recent reports indicated that the THP could alleviate oxidative stress of MPs/NPs in AD, little is known about how different solids contents of sludge would influence its effectiveness. This study scrutinized how the THP (160 °C, 60 min) affects AD of primary sludge with 4, 8, and 12% total solids (TS) when exposed to polystyrene nanoplastics (PsNPs). The presence of PsNPs (150 μg/L) substantially enhanced reactive oxygen species (ROS) levels at lower TS (4 and 8%) compared to a higher TS of 12% (16.20–16.71% vs 8.79%). Consequently, methane production decreased by 7.25–15.07% for 4–8% TS. Nonetheless, applying the THP could effectively mitigate ROS-induced stress and the propagation of most antibiotic resistance genes (ARGs). Moreover, a positive correlation was observed between the changes in extracellular polymeric substances due to the THP and the impact of PsNPs. These results provide new insights into understanding the significance of the sludge solids content in the THP for coremediation of PsNPs-induced oxidative stress and ARGs propagation in AD.

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Impact of hydrothermal pre-treatment on the anaerobic digestion of different solid–liquid ratio sludges and kinetic analysis

Abstract: This study is an assessment of hydrothermal pre-treatment (HTP) of different solid–liquid ratio (SLR) sewage sludge for enhancement of biogas production by anaerobic digestion.

Cited by 35 publications

References 52 publications

Potential of butanol production from Thailand marine macroalgae using Clostridium beijerinckii ATCC 10132‐based ABE fermentation

Potential of butanol production from Thailand marine macroalgae using Clostridium beijerinckii ATCC 10132‐based ABE fermentation

Enhancing anaerobic degradation of oily sludge using subcritical hydrothermal pretreatment

Sludge Thermal Hydrolysis for Mitigating Oxidative Stress of Polystyrene Nanoplastics in Anaerobic Digestion: Significance of the Solids Content

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