TY - JOUR
T1 - Enhanced silicon bioavailability of biochar derived from sludge conditioned with Fenton's reagent and lime
AU - Tao, Shuangyi
AU - Liang, Sha
AU - Wu, Xiang
AU - Hou, Huijie
AU - Yu, Wenbo
AU - Xiao, Keke
AU - Liu, Bingchuan
AU - Yuan, Shushan
AU - Hu, Jingping
AU - Yang, Jiakuan
N1 - Publisher Copyright:
© 2021
PY - 2022/2/1
Y1 - 2022/2/1
N2 - Biological wastewater treatment generates a large quantity of sewage sludge that requires proper treatments. In this study, the biochar pyrolyzed by sludge conditioned with Fenton's reagent and lime (referred to as Fenton-lime system) was first used as an efficient silicon fertilizer for rice cultivation. When the pyrolysis temperature was 750 °C, the dissolved silicon and available silicon contents in biochar derived from sludge conditioned with Fenton-lime system were much higher than those in raw sludge derived biochar without conditioning (3.49 vs. 0.72, 77.25 vs. 2.33 mg/g dry solid, respectively). The enhanced available silicon content was attributed to the newly formed calcium aluminosilicate from the reactions between the added lime and silicon-rich phases in sludge. The rice cultivated with biochar derived from Fenton-lime conditioned sludge showed improved biomass of stem and root by 76.85% and 36.11%, respectively, compared to blank group without the addition of Si source. Heavy metals and the reactive oxygen species (ROS) accumulation in rice were not observed after a culture period of 30 days in the application of sludge-derived biochar as silicon fertilizer. This study provides a promising approach for sewage sludge recycling as an efficient silicon fertilizer in silicon-deficiency land.
AB - Biological wastewater treatment generates a large quantity of sewage sludge that requires proper treatments. In this study, the biochar pyrolyzed by sludge conditioned with Fenton's reagent and lime (referred to as Fenton-lime system) was first used as an efficient silicon fertilizer for rice cultivation. When the pyrolysis temperature was 750 °C, the dissolved silicon and available silicon contents in biochar derived from sludge conditioned with Fenton-lime system were much higher than those in raw sludge derived biochar without conditioning (3.49 vs. 0.72, 77.25 vs. 2.33 mg/g dry solid, respectively). The enhanced available silicon content was attributed to the newly formed calcium aluminosilicate from the reactions between the added lime and silicon-rich phases in sludge. The rice cultivated with biochar derived from Fenton-lime conditioned sludge showed improved biomass of stem and root by 76.85% and 36.11%, respectively, compared to blank group without the addition of Si source. Heavy metals and the reactive oxygen species (ROS) accumulation in rice were not observed after a culture period of 30 days in the application of sludge-derived biochar as silicon fertilizer. This study provides a promising approach for sewage sludge recycling as an efficient silicon fertilizer in silicon-deficiency land.
KW - Phytotoxicity
KW - Rice cultivation
KW - Silicon bioavailability
KW - Silicon species
KW - Sludge-derived biochar
UR - http://www.scopus.com/inward/record.url?scp=85117689094&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.150941
DO - 10.1016/j.scitotenv.2021.150941
M3 - 文章
C2 - 34653465
AN - SCOPUS:85117689094
SN - 0048-9697
VL - 806
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 150941
ER -
