Application of biochars and solid fraction of digestate to decrease soil solution Cd, Pb and Zn concentrations in contaminated sandy soils

Poucke, Reinhart Van; Egene, Caleb Elijah; Allaert, Simon; Lebrun, Manhattan; Bourgerie, Sylvain; Morabito, Domenico; Ok, Yong Sik; Ronsse, Frederik; Meers, Erik

doi:10.1007/s10653-019-00475-4

Cited by 14 publications

(9 citation statements)

References 59 publications

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“…Mining activities lasted until the end of the nineteenth century and resulted in the production of large amounts of wastes contaminated mainly by arsenic and lead (Cottard, 2010). Previous studies showed that this soil was very acidic, with low organic matter content (2.60%; Lebrun et al, 2019) and a sandy texture composed of 93% sand, 6.5% silt, and 0.4% clay (Van Poucke et al, 2019). Soil samples were collected in one of the settling ponds (between 0 and 20 cm of depth) in the area called Roure-les-Rosiers.…”

Section: Studied Sitementioning

confidence: 99%

Effects of carbon‐based materials and redmuds on metal(loid) immobilization and growth of Salix dasyclados Wimm. on a former mine Technosol contaminated by arsenic and lead

et al. 2020

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Metal(loid) soil contamination is a widespread issue and its remediation a priority.Phytoremediation involves the use of plants to stabilize/extract metal(loid)s and prevent spreading of contaminants. Salicaceae are fast growing trees that can tolerate and accumulate metal(loid)s. Amendments may be needed to facilitate plant growth on the contaminated substrate. Biochar, the solid product of pyrolysis, can ameliorate soil properties and reduce metal(loid) bioavailability but showed low affinity toward arsenic. Redmud, a waste product, can immobilize arsenic and other metal(loid)s and improve soil conditions. To evaluate the potential of those amendments to immobilize metal(loid)s and facilitate the establishment of a cover vegetation with willow (Salix dasyclados Wimm.), a pot experiment was conducted using several carbonbased materials (biochar and activated carbon) and redmuds. Two carbon-based materials and two redmuds were selected for the pot experiment based on characteristics and sorption tests. A former mining soil was amended with these products and Salix dasyclados cuttings were planted. Biochar and one redmud improved growth of Salix dasyclados Wimm. Redmud, which is cheaper than biochar, performed equally well as the biochar at a lower application rate. It can therefore be concluded that the application of redmud, associated to Salix dasyclados, could be an option for the phytoremediation of an As and Pb contaminated soil. However, these results need to be evaluated on a bigger scale to assess the gain brought by the combination of redmud and Salix dasyclados on the contaminated area.

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Section: Studied Sitementioning

confidence: 99%

Effects of carbon‐based materials and redmuds on metal(loid) immobilization and growth of Salix dasyclados Wimm. on a former mine Technosol contaminated by arsenic and lead

et al. 2020

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“…Moreover, European policy has recognised soil organic carbon (SOC) as an instrument to reduce CO 2 emission through soil C sequestration (Lugato et al 2014). Finally, organic soil improvers have also proven their potential utilisation to reduce metal mobility in soils exhibiting elevated concentrations, and by doing so alleviate associated environmental risks (Van Poucke et al 2020;Egene et al 2018). Therefore, there is a need for increased utilisation of C-rich biosolids in agriculture to improve soil organic matter and increase soil C reserves.…”

Section: Introductionmentioning

confidence: 99%

Solid fraction of separated digestate as soil improver: implications for soil fertility and carbon sequestration

et al. 2020

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Purpose This study investigated the C and N mineralisation potential of solid fractions (SFs) from co-digestated pig manure after P-stripping (P-POOR SF) in comparison with P-rich SFs, as a means to estimate their organic matter stability in soil. Compost (COMP) and biochar (BCHR) (made from P-POOR SF) were also included in the study as reference biosolids. Methods The SFs were incubated in a sandy-loam soil under moist conditions to determine production of CO2 and mineral N. At specified intervals, CO2 evolution in the mixtures was measured via the alkali trap method and titration over a period of 81 days, while mineral N was measured using a flow analyser after KCl extraction over a period of 112 days. Results The various SFs showed similar patterns of C mineralisation (15–26% of added total C in 81 days) that were clearly higher than for COMP and BCHR (6% and 7%, respectively). Temporary N immobilisation was observed in biosolids with a high C/N ratio. The effective organic matter (EOM) of the SFs was calculated based on the C mineralisation data and varied between 130 and 369 kg Mg−1. Conclusions The SF with a reduced P content had a high EOM/P ratio which is beneficial in areas where P status of the soil is already high. Moreover, the N mineralisation patterns confirm that a high C/N ratio may also reduce risks for N leaching due to temporary N immobilisation.

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“…Among these metals, the contents of Mn, Cu, Zn, and Ba were clearly higher than other metals and ranged in 1.6–408 mg/Kg. The high levels of these metals should be contributed by the background of CM and CG carbon. , Generally, the concentrations of the heavy metals were remarkably lower than European threshold values for sewage sludge application (40 mg/kg for Cd, 1200 mg/kg for Pb, 400 mg/kg for Ni, 1750 mg/kg for Cu, and 1500 mg/kg for Cr) and below the concentration limits for biochar set by International Biochar Initiative (IBI) (1.4–39 mg/kg Cd, 93–1200 mg/kg Cr, 143–6000 mg/kg Cu, 121–300 mg/kg Pb, 47–420 mg/kg Ni and 418–7400 mg/kg Zn). − Using these criteria, all the CMW and CGW biochars can qualify as soil enhancers or concentrated chemical fertilizers.…”

Section: Resultsmentioning

confidence: 92%

Activation of Biochars by Waste Phosphoric Acids: An Integrated Disposal Route of Waste Acids and Solid Waste

Niu

Jin

Sun

et al. 2021

ACS Sustainable Chem. Eng.

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Waste phosphoric acid can pose severe adverse effects to environments and ecological systems if directly discharged. As an important and irreplaceable element, the recovery of phosphorus (P) is essential for the sustainability of modern world. To recover P from waste acids, we impregnated coffee ground or chicken manure into waste phosphoric acid polishing solution to store H 3 PO 4 in biomass. After activated/carbonized at high temperature and subsequent washing with purified water, H 3 PO 4 was recollected and activated carbon (AC) was achieved. The results indicated that the coffee ground was ideal reagents to recover P, and the recovery of H 3 PO 4 was as high as 70% when the carbonization temperature was 500−600 °C, and the obtained AC was of the characteristic of the P dopant, large surfaces (315−811 m 2 /g), and mesopores. However, chicken manure led to little loss of P at high temperatures by converting P 2 O 5 /H 3 PO 4 into metaphosphate salts. This novel strategy realizes efficient utilization of solid waste, P recovery, heavy metal separation, and organic chemical elimination from waste acids, without producing new solid or liquid waste.

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Application of biochars and solid fraction of digestate to decrease soil solution Cd, Pb and Zn concentrations in contaminated sandy soils

Cited by 14 publications

References 59 publications

Effects of carbon‐based materials and redmuds on metal(loid) immobilization and growth of Salix dasyclados Wimm. on a former mine Technosol contaminated by arsenic and lead

Effects of carbon‐based materials and redmuds on metal(loid) immobilization and growth of Salix dasyclados Wimm. on a former mine Technosol contaminated by arsenic and lead

Solid fraction of separated digestate as soil improver: implications for soil fertility and carbon sequestration

Activation of Biochars by Waste Phosphoric Acids: An Integrated Disposal Route of Waste Acids and Solid Waste

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