Thermal Hydrolysis to Enhance Anaerobic Digestion Performance of Wastewater Sludge

Chang, Sheng; Filer, Jameson

doi:10.1007/s40726-020-00163-3

Cited by 18 publications

(3 citation statements)

References 84 publications

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“…Li reported that free ammonia at 560 ~ 568 mg/L inhibited methane production by 50% in TAD [36]. Another study on TAD of manure also showed poor treatment ability, when the free ammonia was higher than 600 mg/L [37]. This indicated that the T−8% group might be affected by the inhibition of FAN, which was consistent with its poor methanogenic performance as Fig.…”

Section: Effects Of Different Tsc On Hydrolysis Of Mad and Tadmentioning

confidence: 58%

A comparative study on mesophilic and thermophilic anaerobic digestion of different total solid content sludges produced in a long sludge-retention-time system

Wang

Peng

et al. 2022

Preprint

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Most waste sludge belongs to long sludge-retention-time (SRT) sludge in China, but its outlet is becoming a severe environmental problem nowadays. In this study, the characteristics of mesophilic and thermophilic anaerobic digestion of long SRT sludge was investigated under different total solid content (TSC) of 4%, 6%, and 8% in batch reactors. The results showed that the methane production potential (P0) and methane production rate (Rmax) of thermophilic anaerobic digestion (TAD) were increased by about 60% and 200% compared with that of the mesophilic anaerobic digestion (MAD) at 4% TSC. In TAD groups, the P0 of 240.95 L/kg-VS and Rmax of 22.17 L/kg-VS/d were achieved in the reactor of 4% TSC while the inhibition concentration of propionate and free ammonia reached 1022 mg/L and 603 mg/L in the reactor of 8% TSC. Although the diversity of microbial community was poor in TAD, Coprothermobacter was enriched in TAD, which could degrade protein efficiently. In addition, the dewaterability of digested sludge in TAD was poorer than that in MAD, and both got worse with the increased TSC. Therefore, it is appropriate for the long SRT sludge to anaerobic digestion under thermophilic condition and lower TSC. So, thermophilic anaerobic digestion with lower TSC might be an alternative approach for the treatment and resource utilization of long SRT sludge.

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Section: Effects Of Different Tsc On Hydrolysis Of Mad and Tadmentioning

confidence: 58%

A comparative study on mesophilic and thermophilic anaerobic digestion of different total solid content sludges produced in a long sludge-retention-time system

Wang

Peng

et al. 2022

Preprint

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“…The advantage of ITHP over THP is that the easily biodegradable components of the substrate are firstly converted into biogas during the first digestion stage, thus greatly reducing the volume of sludge to be submitted to hydrolysis and treating only recalcitrant compounds by ITHP. This saves on capital investment costs [28,29] since much smaller hydrolysis reactors and boilers are needed [30]. A Cambi ITHP pilot plant was installed in Basingstoke (United Kingdom) [31].…”

Section: Characteristicsmentioning

confidence: 99%

Thermal Hydrolysis of Sewage Sludge: A Case Study of a WWTP in Burgos, Spain

2021

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An evaluation of the energy and economic performance of thermal hydrolysis technologies is carried out on a theoretical basis. The wastewater treatment plant (WWTP) of Burgos (Spain) was the base scenario of this evaluation. Energy and mass balances were established considering the registered data of primary and secondary thickened sludge in the WWTP for 2011 to 2016. These balances were analysed considering five different scenarios, taking as Scenario 1, the plant operating with conventional mesophilic digestion. The scenarios considered commercially available technologies. The best results were obtained when hydrolysis was applied to digested sludge and sludge from the Solidstream® process. These two scenarios showed the best performance regarding volatile solid removal and lower demand for live steam, achieving a higher amount of biogas available for valorisation using combined heat and power (CHP) units. The main advantage of the hydrolysis process is the decrease in the volume of digesters and the amount of dewatered sludge needing final disposal. The Solidstream® process allowed a 35% increase in biogas available for engines and a 23% increase in electricity production.

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“…The thermal hydrolysis of the whole incoming stream of manure may improve the degradability of the substrate, mainly given by the high lignocellulosic content of this type of material. There are several reports regarding the treatment of different substrates under thermal hydrolysis [20,101,102]. Alkaline pre-treatment seems to guarantee better solubilization performance at lower temperatures [103].…”

Section: Scenariomentioning

confidence: 99%

Feasibility of Coupling Anaerobic Digestion and Hydrothermal Carbonization: Analyzing Thermal Demand

et al. 2021

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Anaerobic digestion is a biological process with wide application for the treatment of high organic-containing streams. The production of biogas and the lack of oxygen requirements are the main energetic advantages of this process. However, the digested stream may not readily find a final disposal outlet under certain circumstances. The present manuscript analyzed the feasibility of valorizing digestate by the hydrothermal carbonization (HTC) process. A hypothetical plant treating cattle manure and cheese whey as co-substrate (25% v/w, wet weight) was studied. The global performance was evaluated using available data reported in the literature. The best configuration was digestion as a first stage with the subsequent treatment of digestate in an HTC unit. The treatment of manure as sole substrate reported a value of 752 m3/d of biogas which could be increased to 1076 m3/d (43% increase) when coupling an HTC unit for digestate post-treatment and the introduction of the co-substrate. However, the high energy demand of the combined configurations indicated, as the best alternative, the valorization of just a fraction (15%) of digestate to provide the benefits of enhancing biogas production. This configuration presented a much better energy performance than the thermal hydrolysis pre-treatment of manure. The increase in biogas production does not compensate for the high energy demand of the pre-treatment unit. However, several technical factors still need further research to make this alternative a reality, as it is the handling and pumping of high solid slurries that significantly affects the energy demand of the thermal treatment units and the possible toxicity of hydrochar when used in a biological process.

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Thermal Hydrolysis to Enhance Anaerobic Digestion Performance of Wastewater Sludge

Cited by 18 publications

References 84 publications

A comparative study on mesophilic and thermophilic anaerobic digestion of different total solid content sludges produced in a long sludge-retention-time system

A comparative study on mesophilic and thermophilic anaerobic digestion of different total solid content sludges produced in a long sludge-retention-time system

Thermal Hydrolysis of Sewage Sludge: A Case Study of a WWTP in Burgos, Spain

Feasibility of Coupling Anaerobic Digestion and Hydrothermal Carbonization: Analyzing Thermal Demand

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