Speciation evolution of zinc and copper during pyrolysis and hydrothermal carbonization treatments of sewage sludges

Huang, Rixiang; Zhang, Bei; Saad, Emily M.; Ingall, Ellery D.; Tang, Yuanzhi

doi:10.1016/j.watres.2018.01.009

Cited by 69 publications

(35 citation statements)

References 65 publications

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“…Cd, Cr, Ni, Hg and Pb are not reported in Figure 3 as their concentration is lower than 30 mg kg −1 . Since heavy metals mostly remain in the solid phase after HTC treatment, their concentration in the hydrochars increased [45] with the formation of more adsorption points to adsorb heavy metal ions [46]. Considering alkali metals, the HTC treatment concentrated both Ca and Mg in the hydrochar, while Na and K concentration decreased due to their solubility (and thus partial dissolution) into the HTC process water [47].…”

Section: Characterizationmentioning

confidence: 99%

Sewage Sludge Hydrochar: An Option for Removal of Methylene Blue from Wastewater

et al. 2020

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Municipal sewage sludge was subjected to a hydrothermal carbonization (HTC) process for developing a hydrochar with high adsorption capacity for water remediation in terms of dye removal. Three hydrochars were produced from municipal sewage sludge by performing HTC at 190, 220 and 250 °C, with a 3 h reaction time. Moreover, a portion of each hydrochar was subjected to a post-treatment with KOH in order to increase the adsorption capacity. Physicochemical properties of sludge samples, raw hydrochars and KOH-modified hydrochars were measured and batch adsorption studies were performed using methylene blue (MB) as a reference dye. Data revealed that both raw and modified hydrochars reached good MB removal efficiency for solutions with low MB concentrations; on the contrary, MB in high concentration solutions was efficiently removed only by modified hydrochars. Interestingly, the KOH treatment greatly improved the MB adsorption rate; the modified hydrochars were capable of capturing above 95% of the initial MB amount in less than 15 min. The physicochemical characterization indicates that alkali modification caused a change in the hydrochar surface making it more chemically homogeneous, which is particularly evident for the 250 °C hydrochar. Thus, the adsorption process can be regarded as a complex result of various phenomena, including physi- and chemi-sorption, acid–base and redox equilibria.

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Section: Characterizationmentioning

confidence: 99%

Sewage Sludge Hydrochar: An Option for Removal of Methylene Blue from Wastewater

et al. 2020

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“…Thus, more concern should be focused on the PTEs which accumulated in the solid residue (biochar) after hydrothermal treatment (Kong et al 2019b;Yousaf et al 2018). More importantly, the chemical speciation of PTEs was demonstrated to determine the mobility, bioavailability, and ecotoxicity (Huang et al 2018b;Wang et al 2019b); thus, it should be further studied to provide adequate safety for future large-scale application of biochar. Pyrolysis temperature is acknowledged as a key factor in affecting the characteristics of biochar including the immobilization of PTEs (Chen et al 2014;Yousaf et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on PTEs deportment and ecological risks of the biochars obtained from sewage sludge

Kong

Zhang²,

Wang³

et al. 2021

Environ Sci Pollut Res

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Sewage sludge-derived biochars (SSBCs) were obtained at temperatures of 300, 500, and 700 °C to investigate the potentially toxic elements (PTEs) behaviors and assess the environmental acceptability for the possible application in the environment. Results indicated that PTEs exhibited diversely in the distribution of chemical speciation, while all elements tended to be immobilized in biochar matrix and the total amount elevated during the pyrolysis. The risk assessment of biochars implied a low degree of environmental risk for the utilization of SSBCs prepared at high temperatures. In addition, higher pyrolysis temperature alleviated the inhibition on the early seedling growth of Triticum aestivum L., with root elongation more sensitive to the biochar addition. PTEs, especially Cr, contributed much to the phytotoxicity of biochars as revealed by the principle component analysis (PCA) and leaner correlation analysis. Findings from this work illustrated that SSBCs prepared at higher temperatures might be more conductive to a wide range of applications with acceptable environmental risk.

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“…Una de las preocupaciones sobre los metales pesados (MP) es su rápida acumulación en los tejidos biológicos (Dalzochio & Gehlen, 2016;Alegre et al, 2018). Ante la biodisponibilidad de los MP (Moreno et al, 2018) y su ecotoxicidad (Huang et al, 2018;Zhang et al, 2019;Li et al, 2020) existe la tendencia en los estudios ambientales que éstos puedan basarse en las fracciones extraíbles y reducibles por ser las secuenciales de relevancia potencialmente tóxicas (Tessier et al, 1979;Huang et al, 2007;Zhai et al, 2014;Jin et al, 2016;Zeng et al, 2018).…”

Section: Introductionunclassified

Descripción Analítica De Los Ácidos Para La Digestión Química en Muestras Biológicas Expuestas a Metales

Pérez¹,

Iannacone

2020

Biotempo

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El objetivo del estudio fue describir la concentración analítica de los ácidos para la digestión química en muestras biológicas expuestas a metales. Se analizó el ácido clorhídrico (HCl), ácido nítrico (HNO3), ácido perclórico (HClO4), ácido sulfúrico (H2SO4), ácido bórico (H3BO3), ácido fosfórico (H3PO4) y el ácido yodhídrico (HI). De forma experimental los ácidos se aplicaron en las branquias del biomonitor Gambusia punctata (Poey, 1854) para la bioextracción del metal cadmio. Se usó la muestra de referencia certifi cada: DOLT-3: (Dogfi sh Liver) para la confi abilidad analítica de los resultados. Se encontró diferencias estadísticamente signifi cativas en los resultados de las concentraciones de los ácidos y el valor de referencia certificado. El orden de concentración fue: HNO3 > H2SO4 > HClO4 > HCl > HI > H3PO4 > H3BO3. Se concluye que, los ácidos permiten extraer metales bioacumulados en los tejidos biológicos pero su aplicación no combinada con otros ácidos diferirá significamente con el verdadero valor bioacumulado. Las mayores probabilidades para la extracción de metales están con el HNO3, H2SO4 y el HClO4.

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Speciation evolution of zinc and copper during pyrolysis and hydrothermal carbonization treatments of sewage sludges

Cited by 69 publications

References 65 publications

Sewage Sludge Hydrochar: An Option for Removal of Methylene Blue from Wastewater

Sewage Sludge Hydrochar: An Option for Removal of Methylene Blue from Wastewater

Effect of temperature on PTEs deportment and ecological risks of the biochars obtained from sewage sludge

Descripción Analítica De Los Ácidos Para La Digestión Química en Muestras Biológicas Expuestas a Metales

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