The redistribution and migration mechanism of nitrogen in the hydrothermal co‑carbonization process of sewage sludge and lignocellulosic wastes

Wang, Ruikun; Lei, Haoyang; Liu, Senyang; Ye, Xuemin; Jia, Jiandong; Zhao, Zhenghui

doi:10.1016/j.scitotenv.2021.145922

Cited by 83 publications

(10 citation statements)

References 52 publications

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“…The changes in the TN content with increasing HTC temperature were nonlinear, probably because warm-up HTC promoted the cyclization and deamination of proteins, leading to the production of amino acids, ammonia, and nitrogenous compounds . In addition, when the HTC temperature was higher than 220 °C, the TN content of HCAPs decreased, which is consistent with the results of previous studies. , These results indicated that the effect of the HTC temperature on the TN content in HCAPs fluctuated and was accompanied by a change in protein decomposition. The TP content decreased with increasing HTC temperature, probably due to the formation of phosphate precipitates with multivalent metals that entered the solid phase.…”

Section: Results and Discussionsupporting

confidence: 89%

“…2 In addition, when the HTC temperature was higher than 220 °C, the TN content of HCAPs decreased, which is consistent with the results of previous studies. 34,35 These results indicated that the effect of the HTC temperature on the TN content in HCAPs fluctuated and was accompanied by a change in protein decomposition. The TP content decreased with increasing HTC temperature, probably due to the formation of phosphate precipitates with multivalent metals that entered the solid phase.…”

Section: ■ Results and Discussionmentioning

confidence: 85%

“…38 Previous studies have also reported a similar observation. 34 For kitchen garbagederived HCAPs with a low protein content, the NO 3 − -N content was much higher than the NH the precipitation of salts. 39 For sewage sludge-derived HCAPs with a relatively high protein content, the NO 3 − -N content was obviously lower than the NH 4 + -N content and first decreased and then increased with increasing HTC temperature, probably because of the precipitation salts and decomposition of protein-based amino acids.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

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Efficient Disposal of the Aqueous Products of Wet Organic Waste Hydrothermal Carbonization by Paddy Constructed Wetlands

Wang

Miao

et al. 2022

ACS EST Eng.

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The hydrothermal carbonization (HTC) technology has recently been broadly applied. However, disposal of the accompanying high-strength HTC aqueous products (HCAPs) largely determines the promotion and application of the HTC technology. The direct discharge of HCAPs might deteriorate the water environment, and previous studies have reported that HCAPs were insecurely removed via anaerobic fermentation or microalgae production. In this work, wet organic waste HCAPs were characterized and identified, and their removal efficiency in a paddy constructed wetland (PCW) was determined. The HCAPs were found to be rich in nutrients and mainly composed of humic acid (77.8−84.7%) or lignin (44.8−68.2%). With increasing HTC temperature, the relative humic acid content in HCAPs decreased by 4.4−6.4%, as determined by the three-dimensional fluorescence excitation−emission matrix (3D-EEM) analysis. HCAPs also underwent decomposition and polymerization due to the change in MW w and AI mod as determined by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) analysis. The PCW removal efficiency of NH 4 + -N and chemical oxygen demand (COD) reached 99.2 and 93.2% in the HCAP treatments, respectively, which were much higher than the values obtained for traditional disposal applications. On the basis of the higher soil NH 4 + -N content (1.6-to 6.0-fold), larger grain total nitrogen (TN) content (5.1−18.6%), and lower fluorescence intensity (5.7−88.2%), three primary processes (i.e., uptake by rice plants, microbial degradation, and soil immobilization) were proposed as PCW removal mechanisms. This study provides novel utilization prospects for the resource utilization of HCAPs in PCW systems.

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Section: Results and Discussionsupporting

confidence: 89%

Section: ■ Results and Discussionmentioning

confidence: 85%

Section: ■ Results and Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Efficient Disposal of the Aqueous Products of Wet Organic Waste Hydrothermal Carbonization by Paddy Constructed Wetlands

Wang

Miao

et al. 2022

ACS EST Eng.

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“…HTC while known to upgrade sludge dewaterability [28] and increase fuel properties of hydrochars provides energy saving in sewage treatment [29]. Due to these properties, hydrochars derived from biogenic waste can be used as fossil fuel alternatives [30][31][32].…”

Section: Solid Fuel Productionmentioning

confidence: 99%

A Review on Sewage Sludge Valorization via Hydrothermal Carbonization and Applications for Circular Economy

2022

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In pursuit of establishing a circular economy, a waste-to-energy approach is gaining increasing attention. Valorization of sewage sludge constitutes a critical importance due to generation in high quantities, difficulties in disposal, and associating environmental impacts. Hydrothermal carbonization (HTC) is a relatively recent yet an acclaimed method for sewage sludge management and valorization due to process compliance with sludge characteristics. In this review, research studies are evaluated via categorization of application fields of sludge-derived HTC products such as solid fuel production, gas production, soil remediation, nutrient recovery, water treatment, and energy storage. Research findings are compiled and a network mapping is employed for the visualization of the current situation and correlation in respective fields. The potential of HTC for sewage sludge valorization and future projections concerning available techniques are assessed within the context of circular economy.

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“…Hydrothermal carbonization (also known as wet roasting, HTC) is one of the thermochemical conversion methods [5]. Research on the use of HTC to convert waste biomass into solid fuels, land sorbents, and other applications has received much attention in recent years [6,7].…”

Section: Introductionmentioning

confidence: 99%

Conversion of Waste Corn Straw to Value-Added Fuel via Hydrothermal Carbonization after Acid Washing

et al. 2022

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To enhance the hydrothermal carbonization (HTC) process on biomass waste and improve the quality of biomass solid fuel. Corn straw was pretreated with acid washing and subsequently hydrothermally carbonized at 180–270 °C. The solid product obtained (hydrochars) was compared with the solid product produced from untreated hydrothermally carbonized straw. The results show that the acid pretreatment removed 7.9% of the ash from the straw. ICP and XRD analysis show that most of the alkali and alkaline earth metals have been removed. This addresses the defect of high ash content as the HTC temperature increases. The HHV of hydrochars produced by HTC after acid washing can reach 27.7 MJ/kg, which is nearly 10% higher than that of hydrochars prepared without acid washing pretreatment, and nearly 70% higher than that of straw raw materials. Elemental analysis and FTIR analysis show that the acid washing pretreatment changed the content and structure of the biomass components in the straw, resulting in a more complete HTC reaction and higher carbon sequestration. The decrease of H/C and O/C deepened the degree of coal-like transformation of hydrochars, with the lowest approaching the bituminous coal zone. The combustion characteristics of the hydrochars prepared after acid washing were significantly upgraded, the comprehensive combustion index and thermal stability of hydrochars both increased. Therefore, HTC after acid washing pretreatment is beneficial to further improve the high heating value and combustion characteristics of hydrochar.

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The redistribution and migration mechanism of nitrogen in the hydrothermal co‑carbonization process of sewage sludge and lignocellulosic wastes

Cited by 83 publications

References 52 publications

Efficient Disposal of the Aqueous Products of Wet Organic Waste Hydrothermal Carbonization by Paddy Constructed Wetlands

Efficient Disposal of the Aqueous Products of Wet Organic Waste Hydrothermal Carbonization by Paddy Constructed Wetlands

A Review on Sewage Sludge Valorization via Hydrothermal Carbonization and Applications for Circular Economy

Conversion of Waste Corn Straw to Value-Added Fuel via Hydrothermal Carbonization after Acid Washing

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