Effects of stepwise thermal hydrolysis and solid-liquid separation on three different sludge organic matter solubilization and biodegradability

Yang, Dongyuan; Dai, Xiaohu; Song, Liang; Dai, Lingling; Dong, Bin

doi:10.1016/j.biortech.2019.121753

Cited by 27 publications

(4 citation statements)

References 35 publications

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“…Most of the current studies preferred combining high temperature with short time for anaerobic digestion pretreatment. ,, For example, in the study by Yang et al, three dewatered sludges were pretreated at 160 °C for 90 min before anaerobic digestion. However, the methane production potential of the sludge pretreated for a prolonged contact time at a low temperature could be superior to that treated at a high temperature with a short contact time.…”

Section: Resultsmentioning

confidence: 99%

“…The profiles and the maximum methane production values could reach the same level as that of high-organic content sludges. 14,15,23,33 For instance, in the study by Toutian et al, 14 the biomethane potential of the thermally hydrolyzed waste active sludge (the VS of the sludge was 73.4% TS) at temperatures of 90−170 °C was around 170.26−301.73 mL/gVS. The results demonstrated that low-temperature thermal hydrolysis is an efficient pretreatment for the anaerobic digestion of sludge with a low organic content.…”

Section: Resultsmentioning

confidence: 99%

“…However, most of the previous studies preferred to increase the temperature of thermal hydrolysis pretreatment to achieve better efficiency, ,− which requires a high energy input and largely reduces the overall profit ability of the process . A recent study revealed that a high methane yield was obtained from the sludge treated hydrothermally at 150–190 °C, with the yield increasing by 18–31% compared with that of the control group.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Deep Utilization of Low-Organic Content Sludge by Processing Time-Extended Low-Temperature Thermal Pretreatment

Liu

Wang³

et al. 2021

ACS Omega

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Anaerobic digestion is an important way for maintaining sewage sludge stability, reduction, and resource recovery. However, the low organic content generally limits methane production. Recently, thermal hydrolysis has been widely used for sludge pretreatment to improve the anaerobic digestion efficiency. Generally, an increased temperature is preferred to enhance the solubility of organic matters in the sludge. However, high energy requirement comes with increased temperature. Application of low-temperature thermal treatment could overcome this drawback. However, the appropriate low-temperature pretreatment time is still uncertain. In this study, an extended contact time with low thermal pretreatment (90 °C) was chosen to realize a more efficient and economical digestion process of low-organic content sludge. The results demonstrated that the solubilization of proteins and carbohydrates was significantly promoted by the contact time-extended thermal hydrolysis pretreatment. The following anaerobic digestion efficiency of low-organic content sludge was also dramatically improved with the prolonged contact time. The maximum methane production could reach around 294.73 mL/gVS after 36 h of 90 °C treatment, which was 5.56 times that of the untreated groups. Additionally, based on the energy balance calculation, extending the thermal hydrolysis time resulted in a more economically feasible anaerobic digestion than increasing the temperature. The dewatering properties and the stability of the heavy metals were also reinforced, implying the advanced deep utilization of the digested low-organic content sludge. In conclusion, sludge pretreated by low-temperature thermal hydrolysis with a prolonged contact time could be more effective for low-organic content sludge treatment and disposal.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Deep Utilization of Low-Organic Content Sludge by Processing Time-Extended Low-Temperature Thermal Pretreatment

Liu

Wang³

et al. 2021

ACS Omega

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“…Following the worldwide crisis of organic solid waste (OSW) generation, in recent years, it has attracted attention on the continuous uptrend of energy consumption for OSW management [1,2]. The sewage sludge produced in wastewater treatment plants (WWTPs) is one of the most concerning OSWs due to its huge quantity, serious pollution, difficulty in disposal, as well as great potential for resource recovery [3][4][5]. The cost of sludge disposal is up to half of the total running costs in WWTPs [6,7].…”

Section: Introductionmentioning

confidence: 99%

Review of Melanoidins as By-Product from Thermal Hydrolysis of Sludge: Properties, Hazards, and Removal

Li,

Zhang,

Xiao

et al. 2024

Processes

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Melanoidins, as macromolecular heterogeneous organic polymers, are produced from the Maillard reaction between amino and carbonyl groups during the thermal hydrolysis pretreatment (THP) of sludge. The brown color and recalcitrance of melanoidins pose a serious threat to wastewater treatment systems, such as invalidating UV disinfection and decreasing the efficiency of anaerobic digestion; thus, they have gradually received much concern in recent years. However, currently the study on THP-origin melanoidins is limited by a lack of reliable extraction and quantification methods. This paper presents a comprehensive review of the physical, chemical, and biological properties of melanoidins from different sources to fill the research gap on THP-origin melanoidins. The adverse effects of melanoidins on the management of wastewater and sludge are discussed, and for the first time, special attention is paid to the potential environmental hazards of THP-origin melanoidins to natural ecosystems. The removal technologies of melanoidins are summarized and compared as well. Finally, the suggested areas that future studies should focus on are provided. This review is dedicated to providing guidance on melanoidin research and management for the better development of the THP industry.

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Effect of humic substances on the anaerobic digestion of secondary sludge in wastewater treatment plants: a review

Wang¹,

Li²,

Siddiqui³

et al. 2023

Environ Chem Lett

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Effects of stepwise thermal hydrolysis and solid-liquid separation on three different sludge organic matter solubilization and biodegradability

Cited by 27 publications

References 35 publications

Enhanced Deep Utilization of Low-Organic Content Sludge by Processing Time-Extended Low-Temperature Thermal Pretreatment

Enhanced Deep Utilization of Low-Organic Content Sludge by Processing Time-Extended Low-Temperature Thermal Pretreatment

Review of Melanoidins as By-Product from Thermal Hydrolysis of Sludge: Properties, Hazards, and Removal

Effect of humic substances on the anaerobic digestion of secondary sludge in wastewater treatment plants: a review

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