期刊
WASTE MANAGEMENT
卷 87, 期 -, 页码 71-77出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2019.01.045
关键词
Sewage sludge; Biochar; CaO amendment; Phosphorus recovery; Heavy metals
资金
- National Natural Science Foundation of China [41572349, 41877123]
In this study, biochar samples were prepared from the co-pyrolysis of sewage sludge (SS) and CaO to explore the transformation of P speciation in sample. The potential of these biochar as a fertilizer to promote the growth of the plant was also evaluated. The result indicated that CaO addition can greatly facilitate the conversion of non-apatite inorganic phosphorus (NAIP) to apatite inorganic phosphorus (AP, mainly Ca-3(PO4)(2) and Ca3Mg3 (PO4)(4)). The addition of 10% CaO in feedstock is sufficient to convert SS inherent P into more bioavailable AP. Under such a dosage, AP content in biochar increased by 21.2-33.6% in contrast to CaO free sample at pyrolysis temperature of 500-800 degrees C, and water-soluble phosphorus (WSP) content decreased to less than 1% of TP. The addition of CaO can also apparently reduce Zn, Mn leaching from biochar. Additionally, hydroponics assay showed that CaO amended SS biochar can promote the growth of rice seedling. The results of this study indicate that preparing CaO amended SS biochar is a technically feasible strategy to utilize P resource in SS. (C) 2019 Elsevier Ltd. All rights reserved.
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