Strategy to enhance semi-continuous anaerobic digestion of food waste by combined use of calcium peroxide and magnetite

Zhu, Lirong; Wu, Baocun; Liu, Yongli; Zhang, Jianrui; Deng, Rui; Gu, Li

doi:10.1016/j.watres.2022.118801

Cited by 56 publications

(5 citation statements)

References 49 publications

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“…While the addition of milliQ water does not add biomass, the positive effects of the microbial community in the influent are likely limited to the acclimatisation stage [106] and hence of minimal net value by the start of the rest periods. Turnover of reactor contents during this stage resulted in an increase in pH, potentially preventing washout [107]. Upon restarting feeding for Stage IV, gas production rates rapidly returned to levels previously seen late in Stage I, while pH continued to fall.…”

Section: Semi-continuous Operationmentioning

confidence: 87%

Source-Separated Industrial Wastewater Is a Candidate for Biogas Production through Anaerobic Digestion

Elliott,

Krohn,

Ball

2024

Fermentation

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Anaerobic digestion is a potential treatment for industrial wastewater that provides valuable end-products, including renewable energy (biogas). However, waste streams may be too variable, too dilute at high volumes, or missing key components for stable digestion; all factors that increase costs and operational difficulty, making optimisation crucial. Anaerobic digestion may benefit from process intensification, particularly the novel combination of high-strength source-separated wastewater to minimise volume, together with the use of biosolids biochar as a chemical and microbial stabiliser. This study investigates the stability, yield, and microbial community dynamics of the anaerobic digestion of source-separated industrial wastewater from a food manufacturer and a logistics company, using biosolids biochar as an additive, focusing on gas and volatile fatty acid (VFA) production, process stability, and the microbial community using bench-scale semi-continuous reactors at 30- and 45-day hydraulic retention time (HRT). While gas yields were lower than expected, stability was possible at high HRT. Methane production reached 0.24 and 0.43 L day−1 per litre reactor working volume at 30- and 45-day HRT, respectively, despite high VFA concentration, and was linked to the relative abundance of Methanosarcina in the microbial community. Interactions between substrate, VFA concentration, and the microbial community were observed. Biochar-assisted anaerobic digestion holds promise for the treatment of source-separated wastewater.

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Section: Semi-continuous Operationmentioning

confidence: 87%

Source-Separated Industrial Wastewater Is a Candidate for Biogas Production through Anaerobic Digestion

Elliott,

Krohn,

Ball

2024

Fermentation

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“…The semicontinuous AD test was conducted for 138 days. The total volume of the bottle is 1.0 L, and the working volume is 0.8 L. 18 All of the bottles are placed in a shaker (60 rpm) and maintained at 37.0 °C. 19 Feed and discharge were conducted every three days.…”

Section: Methodsmentioning

confidence: 99%

Strategy to enhance the semicontinuous anaerobic digestion of food waste via exogenous additives: experimental and machine learning approaches

Ding,

Zhang,

et al. 2023

RSC Adv.

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“…Secondly, a statistical analysis was not conducted since the reactors were not replicated. However, replicates in studies addressing semi-continuous anaerobic digestion tests are not common in the literature (Liczbiński et al, 2022;Zhu et al, 2022) because these experiments are labor-intensive, very time-consuming, and expensive. Nevertheless, it would be useful to design at least two or three replicates per type of process in future tests.…”

Section: Limitations Of the Present Studymentioning

confidence: 99%

Boosting the circularity of waste management: pretreated mature landfill leachate enhances the anaerobic digestion of market waste

2023

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Adequate waste management is essential not only to ensure healthy living conditions but also to mitigate climate change. Accordingly, the research on developing strategies to boost the circularity of waste management systems is ongoing. In this context, two waste streams are concurrently managed to recover energy and materials in the present study. Specifically, real leachate collected from a full-scale mature landfill site was preliminarily treated through active filtration to remove inhibitory substances partially and then tested, at the laboratory scale, as a nutrient solution for semi-continuous anaerobic digestion of a carbonaceous substrate represented by market waste. The results demonstrate that, at an organic loading rate of 1.0 gVS∙L-1∙d-1, the process was impossible without using the nutrient solution, while the nitrogen present in the pretreated leachate could balance the carbon content of the market waste and provide the system with the necessary buffering capacity, ensuring process stability. The average methane yield (approximately 0.29 NL∙gVS-1) was satisfactory and consistent with the literature. Despite the increases in both the organic loading rate (up to 1.5 gVS∙L-1∙d-1) and volume of added pretreated leachate (up to 100% of the dilution medium), the process remained stable with a slightly lower methane yield of 0.21 NL∙gVS-1, thanks to nitrogen supplementation. The potential use of produced methane as a renewable energy source and residual digestate as fertilizer would close the loop of managing these waste streams.

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Strategy to enhance semi-continuous anaerobic digestion of food waste by combined use of calcium peroxide and magnetite

Cited by 56 publications

References 49 publications

Source-Separated Industrial Wastewater Is a Candidate for Biogas Production through Anaerobic Digestion

Source-Separated Industrial Wastewater Is a Candidate for Biogas Production through Anaerobic Digestion

Strategy to enhance the semicontinuous anaerobic digestion of food waste via exogenous additives: experimental and machine learning approaches

Boosting the circularity of waste management: pretreated mature landfill leachate enhances the anaerobic digestion of market waste

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