Distribution and Contamination Hazards of Heavy Metals in Solid Residues from the Pyrolysis and Gasification of Wastewater Sewage Sludge

Hu, Yanjun; Chen, Guanyi; Ma, Wenchao; Yan, Mi; Han, Long

doi:10.12783/issn.1544-8053/13/4/3

Cited by 17 publications

(8 citation statements)

References 37 publications

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“…The BCR sequence includes the acid-soluble, reducible, oxidizable, and residual fractions of the metals, of which the acid-soluble fraction is regarded as the main mobile and bioavailable form [ 67 ], representing a greater risk for the surrounding environment. Reducible and oxidizable fractions are considered slow release fractions and can transform to acid-soluble species under acid conditions, whereas the residual fraction is relatively immobile with a low bioavailability; it is fixed in the soil lattice and hardly used by organisms [ 68 ]. The results of the fraction analysis are illustrated in Figure 8 .…”

Section: Resultsmentioning

confidence: 99%

Effects of Biochar-Derived Sewage Sludge on Heavy Metal Adsorption and Immobilization in Soils

Zhou

Liú

Gao

et al. 2017

IJERPH

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The object of this study was to evaluate the effect of sewage sludge biochar on adsorption and mobility of Cr, Mn, Cu, and Zn. Biochar (BC400) was produced via pyrolysis of municipal sewage sludge at 400 °C. Maximum adsorption capacities (qm) for Zn, Cr, Mn, and Cu were 5.905, 5.724, 5.681, and 5.342 mg·g−1, respectively, in the mono-metal solution and 2.475, 8.204, 1.01, and 5.415 mg·g−1, respectively, in the multi-metal solution. The adsorption capacities for Mn, Cu, and Zn decreased in the multi-metal solution due to competitive adsorption, whereas the capacity for Cr increased. Surface precipitation is an important mechanism in the sorption of these metals on BC400. The 360-day incubation experiment showed that BC400 application reduced metal mobility in contaminated soils, which was attributed to the substantial decreases in the acid-soluble fractions of Cr, Mn, Cu, and Zn (72.20%, 70.38%, 50.43%, and 29.78%, respectively). Furthermore, the leaching experiment using simulated acid rain indicated that the addition of BC400 enhanced the acid buffer capacity of contaminated soil, and the concentration of Cr, Mn, Cu, and Zn in the leachate was lower than in untreated soil. Overall, this study indicates that sewage sludge biochar application reduces the mobility of heavy metal in co-contaminated soil, and this adsorption experiment is suitable for the evaluation of biochar properties for remediation.

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Section: Resultsmentioning

confidence: 99%

Effects of Biochar-Derived Sewage Sludge on Heavy Metal Adsorption and Immobilization in Soils

Zhou

Liú

Gao

et al. 2017

IJERPH

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“…The scheme of linking WAS and biofuel production can be introduced as a promising approach. However, implementation of appropriate thermochemical processes and its optimum operating conditions are highly desirable based on the type and content of HMs in the WAS, as well as, reactor design and the presence of probable pre-/post-treatment techniques [206]. For example, pyrolysis process at lower temperatures around 400 to 600 °C has been found safer and efficient compared to gasification, liquefaction and incineration with higher temperatures/pressure, thereby increasing the emission of HMs into gaseous phase.…”

Section: Feedstockmentioning

confidence: 99%

“…Moreover, low temperature pyrolysis could contribute a considerable reduction on contamination level, bioavailability and environmental risk of HMs [67,206,207].…”

Section: Feedstockmentioning

confidence: 99%

Opportunities and challenges in sustainable treatment and resource reuse of sewage sludge: A review

Raheem

Sikarwar

et al. 2018

Chemical Engineering Journal

615

165

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“…The BCR sequence includes the acid-soluble, reducible, oxidizable, and residual fractions of metals, of which the acid-soluble fraction is regarded as the main mobile and bioavailable form [39], thereby representing a greater risk for agricultural productivity. Reducible and oxidizable fractions are considered slow-release fractions and can transform to acid-soluble species under acidic conditions, whereas the residual fraction is relatively immobile with low bioavailability [40]. The BCR analysis showed that the application of TSP+BC amendments (mass rate 1:3) at three different doses (3%, 5%, and 10%) induced the transformation of all three metals from soluble to stable forms.…”

Section: Bcr Fractions Of CD Pb and Cu In Tsp+bc-treated Soilmentioning

confidence: 99%

Remediation of Cd-, Pb- and Cu-Contaminated Agricultural Soils by Phosphate Fertilization and Applying Biochar

Liu¹,

Gao²

2019

Pol. J. Environ. Stud.

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Soil contamination by heavy metals is of great concern at the global scale because of its serious potential hazards to agricultural productivity, water environment, and human health [1][2][3]. In China, approximately 20 million hectares of arable land, equivalent to nearly 20% of China's total agricultural land area, is subject to heavy metal contamination [2]. The major heavy metal contaminants are cadmium (Cd) followed by lead (Pb), copper (Cu), etc. These heavy metals often coexist in contaminated soils and cannot be naturally degraded [4,5]. Therefore, for safe food production it is imperative to develop effective methods of remediating soils co-contaminated with heavy metals. AbstractIn this study, biochar (BC), triple superphosphate (TSP), and TSP+BC amendments were utilized for remediation of Cd, Pb, and Cu co-contaminated agricultural soils. The toxicity characteristic leaching procedure (TCLP), the European Community Bureau of Reference (BCR), X-ray diffraction, and scanning electron microscopy-energy dispersive spectrometer techniques were employed to evaluate the effectiveness of the three types of amendments. After soil amendment, pH, heavy metal concentrations in TCLP extracts, and BCR speciation of heavy metals showed significant changes. The application of BC, TSP, and TSP+BC to co-contaminated soils slightly increased soil pH; decreased Pb, and Cu leachability in the TCLP extracts; and lowered the concentrations of the acid-soluble fraction of heavy metals. The application of TSP+BC mixture at the same dose as BC and TSP produced the greatest reduction in available heavy metal concentration. The optimum mass ratio of TSP to BC was 1:3. Overall, the TSP+BC mixture was highly effective in immobilizing Cd, Pb, and Cu in co-contaminated agricultural soils. The experimental results demonstrate that the rational application of the TSP and BC provides benefits of retrenching phosphorus resources, decreasing phosphorus pollution, and lowering the feed costs of debasing soil remediation treatments.

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Distribution and Contamination Hazards of Heavy Metals in Solid Residues from the Pyrolysis and Gasification of Wastewater Sewage Sludge

Cited by 17 publications

References 37 publications

Effects of Biochar-Derived Sewage Sludge on Heavy Metal Adsorption and Immobilization in Soils

Effects of Biochar-Derived Sewage Sludge on Heavy Metal Adsorption and Immobilization in Soils

Opportunities and challenges in sustainable treatment and resource reuse of sewage sludge: A review

Remediation of Cd-, Pb- and Cu-Contaminated Agricultural Soils by Phosphate Fertilization and Applying Biochar

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