Understanding the fate and impact of capsaicin in anaerobic co-digestion of food waste and waste activated sludge

Du, Mingting; Liu, Xuran; Wang, Dongbo; Yang, Qi; Duan, Abing; Hong, Chen; Liu, Yiwen; Wang, Qilin; Ni, Bing‐Jie

doi:10.1016/j.watres.2020.116539

Cited by 123 publications

(68 citation statements)

References 61 publications

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“…ES also contains a lot of organic matter, and the inherent C/N of ES is relatively low (~ 7/1) (Feng et al 2009). Co-digestion of PW and ES has many advantages, such as toxicity dilution, and C/N ratio balance (Du et al 2021). The mixing ratio of PW and ES is an important index affecting co digestion.…”

Section: Introductionmentioning

confidence: 99%

Improvement of anaerobic co-digestion of plant waste and excess sludge using calcium peroxide

Wang¹,

Zhou

Dai

et al. 2021

Environ Sci Pollut Res

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Plant waste (PW) and excess sludge (ES) are two main organic matters of municipal solid waste. However, there are few reports on their anaerobic co-digestion. In this work, the mixed proportion of PW and ES anaerobic co digestion was rst optimized at mesophilic temperature, and then the anaerobic co-digestion of PW and ES was enhanced with strong oxidant calcium peroxide (CP). The results showed that the optimal mixing ratio of PW and ES was 1/1 (in terms of volatile solids), and the C/N of mixed digestion substrate was 23.5/1, the maximum methane production was 172.6 mL/g (in terms of volatile solids). CP could enhance methane production from anaerobic co-digestion of PW and ES. When the content of CP was 0.2 g/g (in terms of total suspended solids), the maximum methane production was 234.8 mL/g, about 1.4 times of the blank. The mechanism investigation showed that CP promoted the release of organic matter during the co-digestion, and the higher the content of CP, the greater the release of soluble chemical oxygen demand. The presence of appropriate amount of CP promoted the activities of key enzymes in anaerobic fermentation process, and then increased the e ciency of methane production. The results of this work provide an alternative strategy for the resource utilization of PW and ES.

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Section: Introductionmentioning

confidence: 99%

Improvement of anaerobic co-digestion of plant waste and excess sludge using calcium peroxide

Wang¹,

Zhou

Dai

et al. 2021

Environ Sci Pollut Res

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“…It can be seen that 166.3 ± 4.0 mL/g VS of methane was produced in the control, which was comparable to that reported previously (130∼160 mL/g VS), indicating the good inoculum quality in this study. 18,37 The addition of 4 g/kg TSS chitosan did not cause a significant effect (p = 0.076, Table S5). However, when the dosage of chitosan increased to 8, 16, and 32 g chitosan/kg TSS, the maximum methane yield decreased, respectively, to 154.3 ± 4.0, 139.5 ± 3.8, and 115.8 ± 3.5 mL/g VS, which was 92.8%, 83.9%, and 69.7% of the control (0 g/kg TSS), respectively (Figure 1a).…”

Section: Effects Of Chitosan On Methane Production Frommentioning

confidence: 98%

“…Anaerobic digestion process generally involves hydrolysis of macromolecular organics (e.g., proteins and carbohydrates), which occurs by hydrolytic microbes, acidogenesis of micromolecular organic substrates, which occurs by acid-producing bacteria, and methanogenesis of acetate and H 2 , which occurs by acetate-dependent and CO 2 -dependent methanogens. − If the substrates are in solid form such as particulate organics, they need to be solubilized before hydrolysis. , Therefore, any factors affecting either these microbes or the organic metabolisms would finally influence the anaerobic digestion process as well as the carbon cycle. For example, 15–150 MPs/L of polyvinyl chloride microplastics and 75–300 MP/L of polyethylene terephthalate (two representative water-insoluble polymers) were reported to be toxic to anaerobic metabolism processes and thereby resulted in decreases in methane production. , However, knowledge of chitosan impacts on anaerobic digestion is still limited.…”

Section: Introductionmentioning

confidence: 99%

How Does Chitosan Affect Methane Production in Anaerobic Digestion?

Liu

et al. 2021

Environ. Sci. Technol.

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The expanding use of chitosan in sewage and sludge treatment processes raises concerns about its potential environmental impacts. However, investigations of the impacts of chitosan on sewage sludge anaerobic digestion where chitosan is present at substantial levels are sparse. This study therefore aims to fill this knowledge gap through both long-term and batch tests. The results showed that 4 g/kg total suspended solid (TSS) chitosan had no acute effects on methane production, but chitosan at 8–32 g/kg TSS inhibited methane production by 7.2–30.3%. Mass balance and metabolism of organic analyses indicated that chitosan restrained the transfer of organic substrates from solid phase to liquid phase, macromolecules to micromolecules, and finally to methane. Further exploration revealed that chitosan suppressed the secretion of extracellular polymeric substances of anaerobes by occupying the connection sites of indigenous carbohydrates and increased the mass transfer resistance between anaerobes and substrates, which thereby lowered the metabolic activities of anaerobes. Although chitosan could be partly degraded by anaerobes, it is much more persistent to be degraded compared with indigenous organics in sludge. Microbial community and key enzyme encoding gene analyses further revealed that the inhibition of chitosan to CO2-dependent methanogenesis was much severer than that to acetate-dependent methanogenesis.

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“…However, AD of food waste may be restricted by the inherent low C/N ratio due to the high content of nitrogen in protein. Some options for further improvement in biogas production include ultrasonic and microwave pretreatments and lipids pre-extraction ( Negri et al., 2020 ), nitrogen removal prior to AD, and codigestion with other substrates such as cattle slurry ( Sun et al., 2020 ) and sewage waste ( Du et al., 2021 ), which supply additional carbon to balance the low C/N ratio.…”

Section: Emerging Biomethane Production Technologiesmentioning

confidence: 99%

Emerging bioelectrochemical technologies for biogas production and upgrading in cascading circular bioenergy systems

et al. 2021

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Biomethane is suggested as an advanced biofuel for the hard-to-abate sectors such as heavy transport. However, future systems that optimize the resource and production of biomethane have yet to be definitively defined. This paper assesses the opportunity of integrating anaerobic digestion (AD) with three emerging bioelectrochemical technologies in a circular cascading bioeconomy, including for power-to-gas AD (P2G-AD), microbial electrolysis cell AD (MEC-AD), and AD microbial electrosynthesis (AD-MES). The mass and energy flow of the three bioelectrochemical systems are compared with the conventional AD amine scrubber system depending on the availability of renewable electricity. An energy balance assessment indicates that P2G-AD, MEC-AD, and AD-MES circular cascading bioelectrochemical systems gain positive energy outputs by using electricity that would have been curtailed or constrained (equivalent to a primary energy factor of zero). This analysis of technological innovation, aids in the design of future cascading circular biosystems to produce sustainable advanced biofuels.

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Understanding the fate and impact of capsaicin in anaerobic co-digestion of food waste and waste activated sludge

Cited by 123 publications

References 61 publications

Improvement of anaerobic co-digestion of plant waste and excess sludge using calcium peroxide

Improvement of anaerobic co-digestion of plant waste and excess sludge using calcium peroxide

How Does Chitosan Affect Methane Production in Anaerobic Digestion?

Emerging bioelectrochemical technologies for biogas production and upgrading in cascading circular bioenergy systems

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