Use of Mg/Ca modified biochars to take up phosphorus from acid-extract of incinerated sewage sludge ash (ISSA) for fertilizer application
JOURNAL OF CLEANER PRODUCTION(2020)
摘要
Recovery of phosphorus (P) from incinerated sewage sludge ash (ISSA) by biochar is an attractive solution for mitigating the P scarcity and transferring waste to resources. This work used Mg/Ca-modified biochars to take up P from the acid-extract from ISSA at low pH (<2), which simplified the previous P recycling process. The hypothesis is to produce a P-enriched post-sorption biochar that can be directly applied as a P fertilizer. Wastes of peanut shell and sugarcane bagasse were used to synthesize Mg/Ca-modified biochars at pyrolysis temperatures of 450 degrees C, 700 degrees C and 850 degrees C. Preliminary results indicated Mg-modified sugarcane bagasse biochar pyrolysed at 700 degrees C produced optimal P-absorption. This biochar was positively charged and had a high specific surface area (1440 m(2)/g), consistent with a layered porous structure. The optimal biochar showed rapid adsorption of P which could be described by the pseudosecond-order model. Successful adsorption of P from the acid-extract by the optimal biochar was mainly due to chemical precipitation and its adsorption capacity is 129.79 mg P/g biochar. (C) 2019 Elsevier Ltd. All rights reserved.
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关键词
Fertilizer,Phosphorus,Sewage sludge ash,Biochars,Peanut shells
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