Repurposing pre-pasteurization as an <i>in situ</i> thermal hydrolysis pretreatment process for enhancing anaerobic digestion of municipal sludge: a horizontal comparison between temperature-phased and standalone thermophilic or mesophilic anaerobic digestion

Zhang, Dian; Santha, Hari; Pallansch, Karen; Novak, John T.; Wang, Zhiwu

doi:10.1039/d0ew00633e

Cited by 2 publications

(2 citation statements)

References 35 publications

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“…Moreover, the steam passed into the system helps in agitation, which increases the heat and mass transfer efficiency. Therefore, pasteurization is also commonly used in water treatment and solid waste treatment [41,42]. However, PTH has the problem of water consumption, and increased volume of sludge after treatment due to water vapor influx.…”

Section: Measurement Of Physicochemical Componentsmentioning

confidence: 99%

Preliminary Study on the Treatment Efficiency of Pasteurized Lime Thermal Alkaline Hydrolysis for Excess Activated Sludge and Reduction of Tetracycline Resistance Genes

Chen¹,

Zhou²,

Zhang³

et al. 2023

Journal of Renewable Materials

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Thermal alkaline hydrolysis is a common pretreatment method for the utilization of excess activated sludge (EAS). Owing to strict environment laws and need for better energy utilization, new methods were developed in this study to improve the efficiency of pretreatment method. Direct thermal hydrolysis (TH), pasteurized thermal hydrolysis (PTH), and alkaline pasteurized thermal hydrolysis (PTH + CaO and PTH + NaOH) methods were used to treat EAS. Each method was compared and analyzed in terms of dissolution in ammonium nitrogen (NH 4 + -N) and soluble COD (SCOD) in EAS. Furthermore, the removal of tetracycline resistance genes (TRGs)and class 1 transposon gene intI1 from EAS was investigated. The NH 4 + -N and SCOD concentrations in EAS treated by PTH were 1.24 and 2.58 times higher than those of TH. However, the removal efficiency of total TRGs and intI1 between the groups was comparable. The SCOD concentration of the PTH + NaOH group was 4.37 times higher than that of the PTH group, and the removal efficiency of total TRGs was increased by 9.52% compared with that by PTH. The NH 4 + -N and SCOD concentrations of the PTH + CaO group could reach 85.04% and 92.14% of the PTH + NaOH group, but the removal efficiency of total TRGs by PTH + CaO was 19.78% lower than that by PTH + NaOH. Thus, to reduce the financial cost in actual operation, lime (CaO) can be used instead of a strong alkali (NaOH), and pasteurized steam at 70°C instead of conventional high-temperature heating to treat EAS. This study provides a reference for the development of alkaline hydrolysis under moderate temperatures along with the removal of TRGs in EAS.

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Section: Measurement Of Physicochemical Componentsmentioning

confidence: 99%

Preliminary Study on the Treatment Efficiency of Pasteurized Lime Thermal Alkaline Hydrolysis for Excess Activated Sludge and Reduction of Tetracycline Resistance Genes

Chen¹,

Zhou²,

Zhang³

et al. 2023

Journal of Renewable Materials

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“…This way, the biodegradability of the substrate is increased and bioreactor performance enhanced. Several reports have evaluated the benefits of thermal hydrolysis, studying the temperature range (120-170 • C) [3][4][5], the effect on solubilization and different types of substrates [6][7][8][9] along with the effect on methane production. An increase in organic matter recalcitrance with the severity of the process has been demonstrated [10][11][12], which may adversely affect the outcome of a subsequent digestion step.…”

Section: Introductionmentioning

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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Repurposing pre-pasteurization as an in situ thermal hydrolysis pretreatment process for enhancing anaerobic digestion of municipal sludge: a horizontal comparison between temperature-phased and standalone thermophilic or mesophilic anaerobic digestion

Abstract: This study evaluated the effect of pre-pasteurization (70 oC for 45 min) on the performance of temperature-phased anaerobic digestion (TPAD) in horizontal comparison with standalone mesophilic and thermophilic anaerobic digestion...

Cited by 2 publications

References 35 publications

Preliminary Study on the Treatment Efficiency of Pasteurized Lime Thermal Alkaline Hydrolysis for Excess Activated Sludge and Reduction of Tetracycline Resistance Genes

Preliminary Study on the Treatment Efficiency of Pasteurized Lime Thermal Alkaline Hydrolysis for Excess Activated Sludge and Reduction of Tetracycline Resistance Genes

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

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