Journal
JOURNAL OF CLEANER PRODUCTION
Volume 279, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.123877
Keywords
Engineered biochar; Phosphorus leaching; Sustainable waste management; Soil amendment; Resource recovery; Agricultural soil
Categories
Funding
- China Agricultural Research System [CARS-23-B16]
- National Key R&D Program of China [2016YFD0801006]
- Hong Kong Research Grants Council [E-PolyU503/17]
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The study developed an Fe/Al (hydr)oxides modified biochar (FA-BC) to reduce P leaching in calcareous soils, demonstrating its higher efficiency in P adsorption compared to raw biochar. The application of FA-BC significantly decreased total P leaching, while maintaining adequate levels of bioavailable P in the soil. Chemical sequestration tests and analyses further showed the transformation of labile Ca-P fractions into stabilized Fe/Al-P complexes, highlighting the superior P retention ability of FA-BC amended soils.
Excessive input of phosphate fertilizer into agricultural soils has caused critical environmental concerns due to high phosphorus (P) accumulation in farmland and P leaching into subsurface drainage. In this study, an Fe/Al (hydr)oxides modified biochar (FA-BC) was fabricated from corn straw via a wet-precipitation method and utilized to reduce P leaching from a fertile calcareous soil. Spectroscopic techniques demonstrated that the FA-BC exhibited a higher oxidation resistance than the raw BC due to oxide impregnation on the BC surface. The maximum Langmuir P adsorption capacities (393 and 528 mg kg(-1)) of the BC (4%, w/w) and FA-BC (4%, w/w) treated soils demonstrated a more efficient P adsorption capacity of the FA-BC. Application of the 2% (w/w) FA-BC also significantly reduced the leaching of total P (81.3%) from the soil column, while maintained an appropriate level of bioavailable P in the soil for sustaining plant growth. The chemical sequestration test and in-situ P k-edge XANES analyses of the FA-BC incubated soils revealed that the labile CaeP fractions were transformed into stabilized Fe/AleP complexes. The increased soil pH, a higher degree of soil P saturation, and intensive interaction between P and Fe/Al (hydr)oxides also contributed to the superior ability of the FA-BC amended soils towards P retention. This study provided field-relevant implications for the design and application of engineered biochar for green and sustainable improvement of agricultural soils. (c) 2020 Elsevier Ltd. All rights reserved.
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