Characterization of value-added chemicals derived from the thermal hydrolysis and wet oxidation of sewage sludge

Malhotra, Milan; Garg, Anurag

doi:10.1007/s11783-020-1305-2

Cited by 19 publications

(7 citation statements)

References 34 publications

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“…The thermal pretreatment of SS was performed in a high-pressure stainless-steel reactor (316) with a volume of 0.7 L in batch mode (Figure S1, Supplemental Information). Similar types of reactors have been used for the laboratory scale studies (Jeong et al, 2019; Li and Noike, 1992; Malhotra and Garg, 2020, 2021; Valo et al, 2004). The instrument is equipped with temperature and mixing controller using proportional integral device to maintain the temperature within ±1°C of the set value, mixing speed adjustment, liquid sampling ports and gas injection port.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the SS pretreatment by the two hydrothermal pretreatment methods, that is, thermal hydrolysis (TH) and hydrothermal carbonization (HTC), is likely to offer several environmental benefits such as reduction in greenhouse gas (GHG) emissions, recovery of value-added chemicals (such as humic substances, phosphorous, etc. ), improved biogas production and less or no sludge for disposal (Gupta et al, 2020; Malhotra and Garg, 2020, 2021). The type and nature of products/by-products depends upon reaction conditions; thus, the products from both the processes generally vary widely.…”

Section: Introductionmentioning

confidence: 99%

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Thermal hydrolysis of sewage sludge: Improvement in biogas generation and prediction of global warming potential

Singh

Garg

2023

Waste Manag Res

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Anaerobic digestion (AD) is a prominent treatment method for the sludge produced from sewage treatment plants. Poor solid reduction and longer retention time are the main drawbacks of AD. Thermal hydrolysis (TH) is a potential pretreatment method for solubilization of sewage sludge (SS) solids thereby improving biogas production during AD post-treatment. In this study, the SS sample (total solids = 1.75 wt% and total chemical oxygen demand (COD) = 15,450 mg L−1) was subjected to TH pretreatment (temperature = 140–180°C and reaction time = 60 minutes) in a 0.7-L capacity stainless-steel high-pressure reactor. At a reaction temperature of 180°C, the maximum solid solubilization (total dissolved solids = 4652 mg L−1) and improved dewaterability (time to filter = 4.7 s.L g−1) were observed. The biochemical methane potential test results showed almost doubling of methane generation from 145 to 284 mL gCOD−1 after TH pretreatment at 180°C. The life cycle assessment approach was used to compare various SS treatment and disposal scenarios, two of which included hydrothermal pretreatment. The scenarios involving hydrothermal pretreatments showed the least global warming potential.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal hydrolysis of sewage sludge: Improvement in biogas generation and prediction of global warming potential

Singh

Garg

2023

Waste Manag Res

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“…COD is an important index to judge the water quality or e ectiveness of wastewater treatment techniques [12,13]. COD was reported to be lower than 3 mg/L in Spanish river [14].…”

Section: Introductionmentioning

confidence: 99%

Variation of Water Quality in Ningxia Section of the Yellow River in Recent 5 Years

Jin

Wang

Dong³

2022

Journal of Chemistry

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The Yellow River is very important for human health and social development in China to require good water quality. This study selected the Ningxia section of the Yellow River as the study area to investigate the water quality variation in 2016–2020. A total of 9 water quality parameters were monitored, and 8 parameters including pH, dissolved oxygen, biological oxygen demand, chemical oxygen demand, total phosphate, fluoride, ammonia-nitrogen, and permanganate index were in the range of Class II standard requirement. Dissolved oxygen concentrations ranged from 7.5 to 9.4 mg/L. However, total nitrogen concentrations in 2018–2020 ranged from 1.87 to 2.8 mg/L to cause the pollution. Both the Nemerow index method and the contamination degree method showed that total nitrogen with high concentration exerted the water pollution. Principal component analysis also proved this. Stricter environmental management strategies for controlling total nitrogen should be taken in the future. The findings provided some useful information for water pollution of the Ningxia section of the Yellow River.

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“…After dewatering, the volume of WAS was reduced to facilitate further treatment. It should be noted that most organic compounds (lipids, proteins, and carbohydrates) within the cell wall were difficult to release, resulting in low efficiency of AD of the dewatered WAS (DSS). , Hydrothermal pretreatment (170 °C, 0.5 h) is one of the most commonly used pretreatment methods in practical engineering to destroy the cell wall and release organic compounds for efficient AD. − Some studies directly used DSS as the substrate for AD, and there were also studies using hydrothermal pretreated dewatered WAS (HPS) for AD . These two kinds of sludge AD were more common, and therefore, the effect of hydrochar on the biogas production from DSS and HPS was investigated.…”

Section: Introductionmentioning

confidence: 99%

Genome-Centric Metatranscriptomics Analysis Reveals the Role of Hydrochar in Anaerobic Digestion of Waste Activated Sludge

Shi

Campanaro

Usman

et al. 2021

Environ. Sci. Technol.

100

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Anaerobic digestion (AD) of waste activated sludge (WAS) has been widely used, while it poses problems including low methane yield and production rate. Hydrochar is produced by hydrothermal liquefaction of biomass; however, little is known about the role of hydrochar in promoting AD of WAS. The present study showed that hydrochar increased the methane production rate by 30.8% and yield by 31.4% of hydrothermal pretreated dewatered WAS. Hydrochar increased the methane production rate and yield by enhancing the acidification and methanogenesis processes. Genomiccentric metatranscriptomics were used to identify the metabolic activities and transcriptomic response of individual metagenomeassembled genomes that were enriched by hydrochar. Although Methanosarcina sp. FDU0106 had been shown unable to used H 2 , it had the complete pathway for the reduction of CO 2 to methane. Syntrophomonas sp. FDU0164 expressed genes for extracellular electron transfer via electrically pili, suggesting that Syntrophomonas sp. FDU0164 and Methanosarcina sp. FDU0106 were exchanging electrons via direct interspecies electron transfer. The expression of pili was decreased, indicating that hydrochar could replace its roles. Additionally, Firmicutes sp. FDU0048, Proteiniphilum sp. FDU0082, and Aminobacterium mobile FDU0089 were related to the degradation of organics, which could be related to the enhanced methane yield.

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Characterization of value-added chemicals derived from the thermal hydrolysis and wet oxidation of sewage sludge

Cited by 19 publications

References 34 publications

Thermal hydrolysis of sewage sludge: Improvement in biogas generation and prediction of global warming potential

Thermal hydrolysis of sewage sludge: Improvement in biogas generation and prediction of global warming potential

Variation of Water Quality in Ningxia Section of the Yellow River in Recent 5 Years

Genome-Centric Metatranscriptomics Analysis Reveals the Role of Hydrochar in Anaerobic Digestion of Waste Activated Sludge

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