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| Potential of phosphorus enhanced cooked rice waste biochar on Cd stabilization in soil |
| Received:August 28, 2020 |
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| KeyWord:phosphorus;cooked rice waste;biochar;soil;Cd;stabilization |
| Author Name | Affiliation | E-mail | | PENG Ya-ru | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | WU Wei-long | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | GUO Zhi-qiang | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | LIU Jun-xi | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | QI Wei-dong | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHANG Zeng-qiang | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | LI Rong-hua | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | rh.lee@nwsuaf.edu.cn |
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| Abstract: |
| In order to evaluate the potential environmental application of phosphorus enhanced biochar, a mixture of cooked rice waste and Ca(H2PO4)2 was thermally treated under oxygen limited condition at 600℃ to obtain phosphorus enhanced rice food waste biochar(EFB). Pristine cooked rice food waste biochar(FB)was also prepared and subsequently characterized. Then, to investigate the potential of FB and EFB biochars on Cd stabilization in soil, the obtained biochars were added to highly contaminated soil with total Cd content of 14.47 mg·kg-1 at biochar application levels of 0(CK), 1%, and 3% in weight ratio, for 30 days of incubation with mustard(Brassica juncea L.) planting experiments. The results showed that, compared with FB, the prepared carbonaceous EFB has a porous structure, with high content of phosphorus and more phosphate minerals including Ca2P2O7, CaHPO4, and Ca10(PO4)6(OH)2. Furthermore, the newly formed phosphate minerals in biochar could stabilize the Cd in the environment through surface deposition. The soil incubation experiment results showed that, compared with CK, the addition of FB and EFB improved the soil pH and electrical conductivity, reduced the content of bioavailable Cd in the soil, and facilitated transformation of Cd in fractions in weak acid extractable and exchangeable forms to relatively stable fractions of oxidizable and residual forms. It also promoted the supply of phosphorus nutrients in the soil and accelerated the growth of mustard. After 30 days of planting experiments, compared to CK, the dry mass of stem and leaf of mustard in treatments of 1%FB, 3%FB, 1%EFB, and 3%EFB increased by 44.28%, 136.53%, 91.88%, and 189.67%, respectively; while the content Cd in stem and leaves of mustard in treatments of 1%FB, 3%FB, 1%EFB, and 3%EFB decreased by 38.17%, 81.74%, 74.59%, and 91.08%, respectively. This investigation indicated that the addition of EB and EFB biochars in soil could promote Cd stabilization, and that EFB has more significant effects than FB in environmental application practice. |
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