Increasing the organic loading rate of household food waste anaerobic digestion by landfill leachate addition: Performance and mechanism

Zou, Lianpei; Wang, Yi; Wu, Ruixin; Ji, Shenghao; Wan, Yulan; Cheng, Hui; Li, Yu-You; Liu, Jianyong

doi:10.1016/j.jenvman.2023.118170

Cited by 8 publications

(2 citation statements)

References 45 publications

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“…In the Granger causality analysis, the p values of OLR were less than 0.05 for nearly all the state and performance variables (Figure 1a). This is the reason why OLR is universally used as a manipulated variable to operate the anaerobic digesters [30,31]. Furthermore, although some state and performance variables appeared to cause changes to each other, their Pearson's correlation coefficients were not significant (Figure 1b).…”

Section: Kinetic Response Of Anaerobic Digestion To the Fluctuations ...mentioning

confidence: 99%

“…However, alkalinity was maintained at about 12 g/L as CaCO 3 , even after a slight drop immediately after the high-impulse OLRs, keeping the pH level above 7.2 (Figure 2b). This is why significant kinetic imbalance did not lead to the worst scenario of failure of anaerobic digestion [30,39]. It suggests that above pH 7, methanogenesis is not significantly inhibited even at a high level of VFAs.…”

Section: Kinetic Response Of Anaerobic Digestion To the Fluctuations ...mentioning

confidence: 99%

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Unraveling Anaerobic Digestion Instability: A Simple Index Based on the Kinetic Balance of Biochemical Reactions

Jia,

Song,

et al. 2023

Processes

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Restoration potential (RP) and deterioration potential (DP) were formulated to shed light on the kinetic balance between anaerobic biochemical reactions. RP is gauged by the ratio of the methanogenesis rate (MR) to the acidogenesis rate (AR), while the DP is the sum of the accumulation rate (AcR) and dilution rate (DR) of total VFAs, normalized using the AR. In an anaerobic digester for a mixture of pulverized food waste and liquified sewage sludge, an RP above 1.0 signifies a restorative state in the kinetic balance of anaerobic biochemical reactions across various operational phases, including startup and steady state, and shifts in organic loading rate. Conversely, a DP value of 0.0 or higher denotes a deterioration in the kinetic balance. The instability index (ISI), calculated as the DP to RP ratio, serves as an indicator of an anaerobic digestion state. When the standard deviation of ISI surpasses 0.2, it signifies instability in biochemical reactions; however, an average ISI below 0.05 indicates a stable digestion process. The study underscores the efficacy of RP, DP, and ISI as robust indicators for assessing the stability of anaerobic digestion based on the kinetics of biochemical reactions.

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Section: Kinetic Response Of Anaerobic Digestion To the Fluctuations ...mentioning

confidence: 99%

Section: Kinetic Response Of Anaerobic Digestion To the Fluctuations ...mentioning

confidence: 99%

Unraveling Anaerobic Digestion Instability: A Simple Index Based on the Kinetic Balance of Biochemical Reactions

Jia,

Song,

et al. 2023

Processes

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Potential and Opportunities of Waste Biomass Valorization Toward Sustainable Biomethane Production

Selvasembian

2024

ChemBioEng Reviews

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The increasing global population has led to a surge in waste production across various fields including agriculture, industry, marine, and household, posing significant waste management challenges. Concurrently, the world is facing an energy crisis, emphasizing the crucial need for sustainable and renewable energy sources. This comprehensive review examines the potential of biomethane production from diverse waste biomass. Feedstock characteristics; anaerobic digestion (AD); biochemical pathways; factors influencing AD; various pretreatment methods such as physical, chemical, biological, and combined; existing policies supporting biomethane production; and potential new policy implications are discussed in this review along with the significance of waste‐to‐energy integration. Our findings indicate that lignocellulosic wastes, primarily agricultural waste, stand out as the most efficient biomass source for biomethane production due to their characteristics such as high carbon/nitrogen ratio, low ash content, and their abundant availability. Among pretreatment methods, combined pretreatment emerges as the most promising option, offering flexibility and effectiveness in enhancing biomethane production. Additionally, the two‐stage digester configuration proves advantageous in overcoming limitations associated with single‐stage digesters such as pH inhibition. Altogether, the review highlights that biomethane production from waste biomass through AD offers a sustainable solution.

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Phosphorus and bioenergy recovery from anaerobic co-digestion of food waste and corn residues with digested sludge: effect of HRT and pre-treatment methods

Khaita,

Chinwetkitvanich,

Polprasert

et al. 2024

Clean Techn Environ Policy

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Organic wastes from the human ecosystem including food waste (FW), agricultural waste and digested sludge (DS) from wastewater treatment can be utilized as valuable materials in anaerobic co-digestion (AcoD) for the dual purpose of bioenergy production and phosphorus (P) recovery through a chemical precipitation process. In this study, AcoD using FW and corn residues (CS) with DS for simultaneous sustainable phosphate release and biogas production were investigated. Different hydraulic retention times (HRT) of 10, 20, and 30 days were investigated, and FW was grinded, while CS pre-treatment methods including physical (FWCS), chemical (FWCS-Chem), and thermal (FWCS-Temp) were considered. The substrates of FW and CS compositions were conducted with a total organic loading of 6 g volatile solids (VS)/L/d (5 FW/1 CS) with a carbon-to-nitrogen ratio (C/N) of 24. The results indicate that FWCS-Chem showed the highest cumulative biogas production simultaneously with P release at HRT 20 days with 7279 L/m3 and 29.67%, respectively. Moreover, the effluent from all digesters exhibited a Mg/P ratio above 1, suitable for struvite precipitation without an external Mg source. Accordingly, FW, FWCS, and FWCS-Chem achieved P recovery rates of 63.64%, 69.75%, and 70.19% at 20-day HRT, with corresponding P contents in solids of 9.45, 9.43, and 8.29%, respectively. These values are comparable to commercial phosphate fertilizer containing 8.80% P. Moreover, incinerating the precipitating solids offers high-quality P concentrations in solids of up to 15.52, 16.32, and 16.31%, respectively. Hence, 20-day HRT was found to be the optimal condition for FW, CS, and DS for anaerobic co-digestion, resulting in the highest biogas production, P release, and maximum financial return for P recovery. Graphical abstract Phosphorus and bioenergy recovery from anaerobic co-digestion of food waste and corn residues with digested sludge.

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Increasing the organic loading rate of household food waste anaerobic digestion by landfill leachate addition: Performance and mechanism

Cited by 8 publications

References 45 publications

Unraveling Anaerobic Digestion Instability: A Simple Index Based on the Kinetic Balance of Biochemical Reactions

Unraveling Anaerobic Digestion Instability: A Simple Index Based on the Kinetic Balance of Biochemical Reactions

Potential and Opportunities of Waste Biomass Valorization Toward Sustainable Biomethane Production

Phosphorus and bioenergy recovery from anaerobic co-digestion of food waste and corn residues with digested sludge: effect of HRT and pre-treatment methods

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