Cleanup of sewage sludge spiked with Cd, Cu, and Zn: Sludge quality and distribution of metals in the “soil-plant-water” system

Barraoui, Driss; Blais, Jean-François; Labrecque, Michel

doi:10.1016/j.chemosphere.2020.129223

Cited by 10 publications

(8 citation statements)

References 77 publications

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“…Low heating rates increase the yield of biochar due to avoidance of secondary pyrolysis reactions. For example, reducing the heating rate from 50 to 10 °C / min in poplar wood pyrolysis, the yield of biochar increases from 3 wt.% to 6 wt.% [33]. Also, highest recorded biochar surface area SBET was recorded 411 m 2 /g at 600 °C at heating rate 30 °C /min.…”

Section: Biochar Desired Properties For Extraction Of Pfasmentioning

confidence: 94%

“…The high cation content in biochar decreases the sorption of PFAS molecules. Hence, current thermal processes can't achieve high conversion rate of PFAS destruction [33]. Below is the expected mean, median and range of detected concentrations in biosolids for PFAS molecules as shown in table 3: Table 3.…”

Section: Expected Pfas Concentration Levels In Biosolidsmentioning

confidence: 99%

“…Longer reaction times supply sufficient time for repolymerization reactions and maximizes the biochar yield. Also, high vapor residence time provide sufficient time for repolymerization reactions and maximize the biochar yield [33].The biochar properties are controlled by key factors including pore size composition, hydrophobicity and pyrolysis temperature and biomass feedstock. Currently, biochar exhibits lower properties than granular activated carbon (GAC) for sorptive purposes.…”

Section: Biochar Desired Properties For Extraction Of Pfasmentioning

confidence: 99%

“…Wastewater sludge are found to be contaminated with perfluoroalkyl carboxylates (PFCAs) and perfluoro-alkane sulfonates (PFSAs) and additional FAS compounds such as Genx. The fate and transport of PFAS compounds from biosolids have shown possible transport and uptake of PFAS to soil and plants [7], [33]. Due to the highly oxidizing nature of PFOA and PFOS, thermal incineration of PFAS in biosolids occurs higher than 1000 ℃, more than 99 wt.% of PFAS is degraded above 600℃ [46].The behavior of per-and poly-fluorinated alkyl substances in biosolids and wastewater is influenced by length of alkyl chain and functional groups.…”

Section: Expected Pfas Concentration Levels In Biosolidsmentioning

confidence: 99%

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Production of Biochar from Biomass Pyrolysis for Removal of PFAS from Wastewater and Biosolids: A Critical Review

Aboughaly¹,

Fattah²

2023

Preprint

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Biochar is an inexpensive and effective carbon sequestration technology produced by slow and fast pyrolysis of biomass feedstock at elevated temperatures in inert conditions producing large quantities of solid residue (i.e., biochar), condensable liquids (bio-oil) and hydrocarbon gases. Biochar have shown excellent adsorption capabilities. Biochar has shown excellent adsorption capabilities for short-chain PFAS and short chain PFAS. This paper suggests optimal pyrolysis reaction conditions to adsorb PFAS to maximum allowable concentrations in wastewater up to Environmental Protection Agency (EPA) is 70 ng/L. The paper highlights the operation conditions and influential reaction conditions to control the microporous structures in Biochar. The paper also aims to summarize the fundamentals of production of Biochar from biomass slow pyrolysis as well as optimal conditions for extraction of PFAS from wastewater streams and destruction of PFAS in biosolids. The scientific contributions for production of Biochar from biomass pyrolysis are highlighted. The paper also highlights the advantages of biochar over activated carbon in terms of low manufacturing costs and higher adsorption rates.

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Section: Biochar Desired Properties For Extraction Of Pfasmentioning

confidence: 94%

Section: Expected Pfas Concentration Levels In Biosolidsmentioning

confidence: 99%

Section: Biochar Desired Properties For Extraction Of Pfasmentioning

confidence: 99%

Section: Expected Pfas Concentration Levels In Biosolidsmentioning

confidence: 99%

See 2 more Smart Citations

Production of Biochar from Biomass Pyrolysis for Removal of PFAS from Wastewater and Biosolids: A Critical Review

Aboughaly¹,

Fattah²

2023

Preprint

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“…For this purpose, new technologies have been adopted at wastewater treatment plants to reduce the metal content of sludge after the treatment of wastewater obtained from different sources. On the other hand, it has also been noted that the concentration of heavy metals in sewage sludge depends on the cleaning performance of each industrial plant [75].…”

Section: Heavy Metal Concentration In Sludgementioning

confidence: 99%

Review on the Use of Heavy Metal Deposits from Water Treatment Waste towards Catalytic Chemical Syntheses

Das

Poater

2021

IJMS

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The toxicity and persistence of heavy metals has become a serious problem for humans. These heavy metals accumulate mainly in wastewater from various industries’ discharged effluents. The recent trends in research are now focused not only on the removal efficiency of toxic metal particles, but also on their effective reuse as catalysts. This review discusses the types of heavy metals obtained from wastewater and their recovery through commonly practiced physico-chemical pathways. In addition, it covers the advantages of the new system for capturing heavy metals from wastewater, as compared to older conventional technologies. The discussion also includes the various structural aspects of trapping systems and their hypothesized mechanistic approaches to immobilization and further rejuvenation of catalysts. Finally, it concludes with the challenges and future prospects of this research to help protect the ecosystem.

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Assessing metal contamination and speciation in sewage sludge: implications for soil application and environmental risk

Feng,

Burke,

Chen

et al. 2023

Rev Environ Sci Biotechnol

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Based on the most recently published data, we definitively estimated that the annual global production of sewage sludge may rise from ~ 53 million tons dry solids currently to ~ 160 million tons if global wastewater were to be treated to a similar level as in the 27 European Union countries/UK. It is widely accepted that the agricultural application is a beneficial way to recycle the abundant organic matter and plant nutrients in sewage sludge. However, land application may need to be limited due to the presence of metals. This work presents a meticulous and systematic review of the sources, concentrations, partitioning, and speciation of metals in sewage sludge in order to determine the impacts of sludge application on metal behavior in soils. It identifies that industrial wastewater, domestic wastewater and urban runoff are main sources of metals in sludge. It shows conventional treatment processes generally result in the partitioning of over 70% of metals from wastewater into primary and secondary sludge. Typically, the order of metal concentrations in sewage sludge is Zn > Cu > Cr ≈ Pb ≈ Ni > Cd. The proportion of these metals that are easily mobilised is highest for Zn and Ni, followed by Cd and Cu, then Pb and Cr. Sludge application to land will lead to elevated metal concentrations, and potentially to short-term changes to the dominant metal species in soils. However, the speciation of sludge-associated metals will change over time due to interactions with plant roots and soil minerals and as organic matter is mineralised by rhizo-microbiome.

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Cleanup of sewage sludge spiked with Cd, Cu, and Zn: Sludge quality and distribution of metals in the “soil-plant-water” system

Cited by 10 publications

References 77 publications

Production of Biochar from Biomass Pyrolysis for Removal of PFAS from Wastewater and Biosolids: A Critical Review

Production of Biochar from Biomass Pyrolysis for Removal of PFAS from Wastewater and Biosolids: A Critical Review

Review on the Use of Heavy Metal Deposits from Water Treatment Waste towards Catalytic Chemical Syntheses

Assessing metal contamination and speciation in sewage sludge: implications for soil application and environmental risk

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