Assessment of Heavy Metals Leaching From (Bio)char Obtained From Industrial Sewage Sludge / Iš Gamybinio Nuotekų Dumblo Pagamintos Bioanglies Sunkiųjų Metalų Išplovimo Įvertinimas

Pečkytė, Julija; Baltrėnaitė, Edita

doi:10.3846/mla.2015.811

Cited by 11 publications

(6 citation statements)

References 18 publications

(18 reference statements)

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Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

“…Peckyte and Baltrenaite studied the properties of carbonized products obtained from residues of various types of the sludges from paper and leather industries [32]. The performed research indicated that the form of biochar restrained the leaching of heavy metals [32], despite the concentrations being considerable when compared with the restrictions set by the regulations [33]. Wang et al performed an assessment of the environmental effects of the carbonization of sewage sludge and concluded that it may have an overall positive environmental impact in comparison with landfilling and incineration [34].…”

Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

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Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

et al. 2019

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The gasification and torrefaction of sewage sludge have the potential to make the thermal utilization of sewage sludge fully sustainable, thus limiting the use of expensive fossil fuels in the process. This includes sustainability in terms of electricity consumption. Although a great deal of work has been performed so far regarding the gasification of sewage sludge and some investigations have been performed in the area of its torrefaction, there is still a gap in terms of the influence of the torrefaction of the sewage sludge on its subsequent gasification. This study presents the results from the torrefaction tests, performed on a pilot scale reactor, as well as two consecutive steam gasification tests, performed in an allothermal fixed bed gasifier, in order to determine if torrefaction can be deemed as a primary method of the reduction of tar content for the producer gas, from the aforementioned gasification process. A comparative analysis is performed based on the results obtained during both tests, with special emphasis on the concentrations of condensable compounds (tars). The obtained results show that the torrefaction of sewage sludge, performed prior to gasification, can indeed have a positive influence on the gas quality. This is beneficial especially in terms of the content of heavy tars with melting points above 40 °C.

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Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

Section: Torrefaction Of Sewage Sludgementioning

confidence: 99%

Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

et al. 2019

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“…An up-flow percolation test was performed in order to determine the leaching behaviour of BCs, as fully described in Peckyte and Baltrenaite (2015). Columns were packed with 137.5 g BCWC450, 130.8 g BCWC700, 210.5 g BCLG450, and 316.7 g BCLG700.…”

Section: Up-flow Percolation Testmentioning

confidence: 99%

Dissolved Organic Carbon Content and Leachability of Biomass Waste Biochar for Trace Metal (Cd, Cu and Pb) Speciation Modelling

Mancinelli

Baltrėnaitė

Baltrėnas

et al. 2017

Journal of Environmental Engineering and Landscape Management

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Dissolved organic carbon (DOC) interacts with dissolved trace metal affecting their mobility and bioavailability through the formation of DOC–metal complexes. Several types of biochar (BC) produced from slow pyrolysis of wood chips (WC), lignin (LG), and digested sewage sludge at 450 and 700 °C were tested for DOC leaching via batch and up-flow percolation test methods. Trace metal (Cd, Cu, and Pb) speciation modelling in BC eluates was carried out combining measured data (i.e., DOC, ph, temperature, and dissolved trace metal concentrations) with data reported in the literature regarding fractions of DOC that are inert or active (i.e., fulvic acids (FA) and humic acids (HA)) in metal binding. BC from LG (BCLG) and WC (BCWC) at 700 °C released lower cumulative amounts of DOC compared with BC at 450 °C in the range 0.02–0.07% and 0.06–0.09% of total carbon content, respectively. For both pyrolysis temperatures, BCWC exhibited a higher tendency to release DOC compared to BCLG. Speciation modelling results showed the predominance of FA and HA complexes of Cd, Cu, and Pb in all the eluates from BCWC and BCLG irrespective of the inert fractions of DOC or the different fractions of active FA and HA considered.

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“…Pyrolysis of sludge has been a subject of a significant amount of studies [36][37][38][39][40]. Baltrenaite and Peckyte studied the properties of pyrolysis product of various types of industrial sewage sludge (from paper and leather industries) [41]. Performed research indicated, that the form of biochar restrained leaching of heavy metals [41], despite that concentrations were considerable, when compared with the restrictions set by the regulations [42].…”

Section: Dry and Wet Torrefaction And Pyrolysis Of Sewage Sludgementioning

confidence: 99%

“…Baltrenaite and Peckyte studied the properties of pyrolysis product of various types of industrial sewage sludge (from paper and leather industries) [41]. Performed research indicated, that the form of biochar restrained leaching of heavy metals [41], despite that concentrations were considerable, when compared with the restrictions set by the regulations [42]. Assessment of environmental effects performed by Wang et al concluded that carbonization of the sewage sludge has overall positive environmental impact in comparison with landfilling and incineration [43].…”

Section: Dry and Wet Torrefaction And Pyrolysis Of Sewage Sludgementioning

confidence: 99%

Novel Concept of an Installation for Sustainable Thermal Utilization of Sewage Sludge

et al. 2018

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This study proposes an innovative installation concept for the sustainable utilization of sewage sludge. The aim of the study is to prove that existing devices and technologies allow construction of such an installation by integration of a dryer, torrefaction reactor and gasifier with engine, thus maximizing recovery of the waste heat by the installation. This study also presents the results of drying tests, performed at a commercial scale paddle dryer as well as detailed analysis of the torrefaction process of dried sewage sludge. Both tests aim to identify potential problems that could occur during the operation. The scarce literature studies published so far on the torrefaction of sewage sludge presents results from batch reactors, thus giving very limited data of the composition of the torgas. This study aims to cover that gap by presenting results from the torrefaction of sewage sludge in a continuously working, laboratory scale, isothermal rotary reactor. The study confirmed the feasibility of a self-sustaining installation of thermal utilization of sewage sludge using low quality heat. Performed study pointed out the most favorable way to use limited amounts of high temperature heat. Plasma gasification of the torrefied sewage sludge has been identified that requires further studies.

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Assessment of Heavy Metals Leaching From (Bio)char Obtained From Industrial Sewage Sludge / Iš Gamybinio Nuotekų Dumblo Pagamintos Bioanglies Sunkiųjų Metalų Išplovimo Įvertinimas

Cited by 11 publications

References 18 publications

Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

Torrefaction as a Valorization Method Used Prior to the Gasification of Sewage Sludge

Dissolved Organic Carbon Content and Leachability of Biomass Waste Biochar for Trace Metal (Cd, Cu and Pb) Speciation Modelling

Novel Concept of an Installation for Sustainable Thermal Utilization of Sewage Sludge

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