Properties of biochars from conventional and alternative feedstocks and their suitability for metal immobilization in industrial soil
PBN-AR
Instytucja
Wydział Matematyki i Informatyki (Uniwersytet Warmińsko-Mazurski w Olsztynie)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Environmental Science and Pollution Research
ISSN
0944-1344
EISSN
Wydawca
DOI
URL
Rok publikacji
2016
Numer zeszytu
21
Strony od-do
21249-21261
Numer tomu
23
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
Autorzy
(liczba autorów: 4)
Pozostali autorzy
+ 3
Słowa kluczowe
angielski
Compost
Digestate
FTIR
Maize
Metal mobility
Pellets
Pyrolysis
Streszczenia
Język
angielski
Treść
In contaminated soils, excessive concentrations of metals and their high mobility pose a serious environmental risk. A suitable soil amendment can minimize the negative effect of metals in soil. This study investigated the effect of different biochars on metal (Cu, Pb, Zn) immobilization in industrial soil. Biochars produced at 300 and 600 °C from conventional (MS, maize silage; WP, wooden pellets) and alternative (SC, sewage sludge compost; DR, digestate residue) feedstocks were used as soil amendments at a dosage of 10 % (w/w). The type of feedstock and pyrolysis temperature affected the properties of the biochars and their ability to immobilize metal in soil. Compared to production at 300 °C, all biochars produced at 600 °C had higher pH (6.2-10.7), content of ash (7.2-69.0 %) and fixed carbon (21.1-56.7 %), but lower content of volatile matter (9.7-37.2 %). All biochars except DR biochar had lower dissolved organic carbon (DOC) content (1.4-2.3 g C/L) when made at 600 °C. Only MS and SC biochars had higher cation exchange capacity (25.2 and 44.7 cmol/kg, respectively) after charring at 600 °C. All biochars contained low concentrations of Cd, Cu, Ni, Pb and Zn; Cd was volatilized to the greatest extent during pyrolysis. Based on FTIR analysis and molar ratios of H/C and O/C, biochars had a greater degree of carbonization and aromaticity after charring at 600 °C. The efficiency of the biochars in metal immobilization depended mainly on their pH, ash content, and concentration of DOC. SC and DR biochars were more effective for Cu and Zn immobilization than MS and WP biochars, which makes them attractive options for large-scale soil amendment.
Inne
System-identifier
0000020425
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