The underlying mechanism of calcium peroxide pretreatment enhancing methane production from anaerobic digestion of waste activated sludge

Wang, Dongbo; He, Dandan; Liu, Xuran; Xu, Qiuxiang; Yang, Qi; Li, Xiaoming; Liu, Yiwen; Wang, Qilin; Ni, Bing‐Jie; Li, Hailong

doi:10.1016/j.watres.2019.114934

Cited by 199 publications

(53 citation statements)

References 56 publications

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“…PW is rich in carbon sources, most of which are cellulose, lignocellulose and so on. The degradation of lignocellulose can be enhanced by CP (Wang et al 2019), which improved the anaerobic digestion performance of PW. In addition, alkaline environment was conducive to the decomposition of extracellular polymer in ES, releasing extracellular organic matter and increasing the content of dissolved organic matter in fermentation broth (Chi et al 2011;Kim et al 2013;Kuang et al2020b).…”

Section: Cp Enhanced the Co-digestion Of Pw And Esmentioning

confidence: 99%

Calcium Peroxide Promoted Anaerobic Co-digestion of Plant Waste and Excess Sludge to Produce Methane

Wang¹,

Zhou

Dai³

et al. 2021

Preprint

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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 first 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 efficiency 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: Cp Enhanced the Co-digestion Of Pw And Esmentioning

confidence: 99%

Calcium Peroxide Promoted Anaerobic Co-digestion of Plant Waste and Excess Sludge to Produce Methane

Wang¹,

Zhou

Dai³

et al. 2021

Preprint

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“…Though several pretreatments for WAS AD are available, recent studies are revealing the humus and lignocellulose solubilization effect of CaO 2 application. The optimum breakdown of humus and lignocelluloses in WAS using CaO 2 to enhance methane yield as well as its fundamental mechanism are also elucidated [32].…”

Section: The Biochemical Methane Potential Assaymentioning

confidence: 99%

Comparative evaluation of the biochemical methane potential of waste activated sludge acetic acid and cellulose substrates under mesophilic and thermophilic anaerobic digestion

Gebreeyessus

2020

SN Appl. Sci.

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Knowing the biochemical methane potential of a substrate to biogas production is a preliminary to possible selection of the pre-anaerobic digestion technology and identifying the optimum reaction time. Following standard method to reactor assembly, feed preparation and monitoring of the specific methane yield, the two temperature systems are compared among substrates. As a result, the rate of biochemical methane yield from the waste activated sludge anaerobic digestion in the thermophilic case is much faster than the mesophilic. The specific methane yield and volatile solid removal of the waste activated sludge batch anaerobic digestion is 74% of the theoretical and 81% for the thermophilic while it is 57% theoretical and 76% for the mesophilic, respectively. However, the best methane yield is recorded for the acetic acid followed by the cellulose and sludge substrates, signifying the importance of sludge pretreatment to enhance degradability in anaerobic digestion. Also, the optimum reaction time for thermophilic and mesophilic systems is different.

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“…Pretreatment breaks down the complex organic structure into simpler molecules that are then more susceptible to microbial degradation. Moreover, the methane yield and content in the biogas can be enhanced by the utilization of chemicals (for example, CaO 2 ) during the pretreatment process, it enables further breakdown and degradation of sludge material 19 , 20 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation analysis of biogas production from beverage wastewater sludge for electricity generation

Admasu

Bogale

Mekonnen

2022

Sci Rep

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This study assessed the biogas and methane production potential of wastewater sludge generated from the beverage industry. The optimization of the biogas production potential of a single fed-batch anaerobic digester was operated at different temperatures (25, 35, and 45 ℃), pH (5.5, 6.5, 7.5, 8.5, and 9.5), and organic feeding ratio (1:3, 1:4, 1:5, and 1:6) with a hydraulic retention time of 30 days. The methane and biogas productivity of beverage wastewater sludge in terms of volatile solid (VS) and volume was determined. The maximum production of biogas (15.4 m3/g VS, 9.3 m3) and methane content (6.3 m3/g VS, 3.8 m3) were obtained in terms of VS and volume at 8.5, 35 ℃, 1:3 of optimal pH, temperature, and organic loading ratio, respectively. Furthermore, the maximum methane content (7.4 m3/g VS, 4.4 m3) and biogas production potential (17.9 m3/g VS, 10.8 m3) were achieved per day at room temperature. The total biogas and methane at 35 ℃ (30 days) are 44.3 and 10.8 m3/g VS, respectively, while at 25 ℃ (48 days) increased to 67.3 and 16.1 m3/g VS, respectively. Furthermore, the electricity-generating potential of biogas produced at room temperature (22.1 kWh at 24 days) and optimum temperature (18.9 kWh) at 40 days was estimated. The model simulated optimal HRT (25 days) in terms of biogas and methane production at optimum temperature was in good agreement with the experimental results. Thus, we can conclude that the beverage industrial wastewater sludge has a huge potential for biogas production and electrification.

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The underlying mechanism of calcium peroxide pretreatment enhancing methane production from anaerobic digestion of waste activated sludge

Cited by 199 publications

References 56 publications

Calcium Peroxide Promoted Anaerobic Co-digestion of Plant Waste and Excess Sludge to Produce Methane

Calcium Peroxide Promoted Anaerobic Co-digestion of Plant Waste and Excess Sludge to Produce Methane

Comparative evaluation of the biochemical methane potential of waste activated sludge acetic acid and cellulose substrates under mesophilic and thermophilic anaerobic digestion

Experimental and simulation analysis of biogas production from beverage wastewater sludge for electricity generation

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