Hydrolysis kinetics in anaerobic digestion of waste activated sludge enhanced by α-amylase

Luo, Kui; Yang, Qi; Li, Xiaoming; Yang, Guojing; Yang, Liu; Wang, Dongbo; Zheng, Wei; Zeng, Guangming

doi:10.1016/j.bej.2011.12.009

Cited by 80 publications

(40 citation statements)

References 25 publications

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“…Even though the kh values from this study are close to the values reported by Mahmoud [34] and Luo et al [15], and the values also fall within the ranges reported by Aldin [16], there is need for caution in comparison of the values due to the different experimental conditions. The summary presented in Table 4 indicates wide ranges of values for the hydrolysis rates, and this could be attributed to the differences in the nature and characteristics of the substrates and the experimental conditions.…”

Section: Discussionsupporting

confidence: 87%

“…However, there is a wide range in the values of hydrolysis rates reported in literature, mainly due to different experimental conditions and biomass-to-substrate ratios [14]. The advancement of characterisation of hydrolysis rates and adoption process models based on the kinetics of anaerobic digestion can provide an understanding of hydrolysis behaviour and ensure accurate design and operation of anaerobic treatment of wastewater [15]. Most of the hydrolysis process models proposed in literature are considered to have a major limitation, which is they are usually based on specific experimental conditions, for example very high or very low substrates to microorganism ratio [16].…”

Section: Introductionmentioning

confidence: 99%

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Hydrolysis rates of domestic wastewater sludge using biochemical methane potential tests

2018

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Domestic wastewater treatment can be improved by reducing energy consumption and increasing carbon recovery, which can be achieved using anaerobic digestion of sludge with methane recovery at ambient temperature. Hydrolysis can be a limiting step in anaerobic digestion, and characterisation of hydrolysis rates and process models should improve design and operation of treatment systems. The hydrolysis of primary sludge and secondary sludge were examined using biochemical methane potential (BMP) tests, with the monitoring of volatile solids concentrations and pH values at 25 o C and 37 o C, and data analysis using MATLAB non-linear least squares curve fitting to a first order hydrolysis model. Low reduction of solids was observed at 25 o C compared to 37 o C, and higher hydrolysis rates at 25 o C than at 37 o C. A correlation was observed between the first order model, digestion time and the reduction of solids based on coefficients of determination (R 2 ). Model predictions were close to observed values, and therefore, the model should be reliable in predicting hydrolysis of sludge at 25 o C and 37 o C.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Hydrolysis rates of domestic wastewater sludge using biochemical methane potential tests

2018

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“…Previous studies showed that practical hydrogen production from organic waste suffered from hydrolysis since it has been considered as a main rate-limiting step in the dark fermentation. Reported first-order hydrolysis reaction rates were as low as 0.005-0.47 day −1 for various biowastes at 20~40°C (Lay et al 1999;Veeken and Hamelers 1999), 0.34 day −1 for kitchen waste (Vavilin et al 2008), 0.4-1.2 day −1 for primary sludge (Siegrist et al 2002), 0.017-0.16 day −1 for secondary sludge at 35°C (Luo et al 2012), and 0.55 day −1 for food wastes (Vavilin et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Harnessing dark fermentative hydrogen from pretreated mixture of food waste and sewage sludge under sequencing batch mode

Nam

Kim

et al. 2015

Environ Sci Pollut Res

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Food waste and sewage sludge are the most abundant and problematic organic wastes in any society. Mixture of these two wastes may provide appropriate substrate condition for dark fermentative biohydrogen production based on synergistic mutual benefits. This work evaluates continuous hydrogen production from the cosubstrate of food waste and sewage sludge to verify mechanisms of performance improvement in anaerobic sequencing batch reactors. Volatile solid concentration and mixing ratio of food waste and sludge were adjusted to 5 % and 80:20, respectively. Five different hydraulic retention times (HRT) of 36, 42, 48, 72, and 108 h were tested using anaerobic sequencing batch reactors to find out optimal operating condition. Results show that the best performance was achieved at HRT 72 h, where the hydrogen yield, the hydrogen production rate, and hydrogen content were 62.0 mL H2/g VS, 1.0 L H2/L/day, and ~50 %, respectively. Sufficient solid retention time (143 h) and proper loading rate (8.2 g COD/L/day as carbohydrate) at HRT 72h led to the enhanced performance with better hydrogen production showing appropriate n-butyrate/acetate (B/A) ratio of 2.6. Analytical result of terminal-restriction fragment length polymorphism revealed that specific peaks associated with Clostridium sp. and Bacillus sp. were strongly related to enhanced hydrogen production from the cosubstrate of food waste and sewage sludge.

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“…The rate constants of COD were predicted by first order kinetics [27]. The hydrolysis constants (k) of Lysimeters 1, 2 and 3 were −0.0013, −0.0020 and −0.0023 d −1 , respectively ( Figure 5).…”

Section: Comparison Of the Leachate And Gas Production Characteristicsmentioning

confidence: 99%

Characteristics of Pollutants and Microbial Communities Obtained in Simulated Lysimeters of Swine Carcasses

2017

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Abstract:This study was performed to investigate the characteristics of pollutants and microbial communities obtained in simulated lysimeters and to evaluate the effects of anaerobic sludge and water on the biodegradation of swine carcasses. The leachate production rates of Lysimeters 2 and 3 with the addition of anaerobic sludge were higher than that of Lysimeter 1 (control). The methane production rate of Lysimeter 3 with anaerobic sludge addition and increased water content was higher than those of other lysimeters. The result of microbial community analysis revealed that the relative abundances of Proteobacteria including pathogens in Lysimeter 3 were lower than those in other lysimeters. Overall, this study demonstrated that the proper operating conditions of lysimeters accelerated the stabilization of swine carcasses and could contribute to sustainable land use.

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Hydrolysis kinetics in anaerobic digestion of waste activated sludge enhanced by α-amylase

Cited by 80 publications

References 25 publications

Hydrolysis rates of domestic wastewater sludge using biochemical methane potential tests

Hydrolysis rates of domestic wastewater sludge using biochemical methane potential tests

Harnessing dark fermentative hydrogen from pretreated mixture of food waste and sewage sludge under sequencing batch mode

Characteristics of Pollutants and Microbial Communities Obtained in Simulated Lysimeters of Swine Carcasses

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