当前位置: X-MOL 学术Waste Manag. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Assessing the potential of sewage sludge-derived biochar as a novel phosphorus fertilizer: Influence of extractant solutions and pyrolysis temperatures
Waste Management ( IF 8.1 ) Pub Date : 2021-02-20 , DOI: 10.1016/j.wasman.2021.01.044
Cícero Célio de Figueiredo , Arthur de Souza Prado Junqueira Reis , Alyson Silva de Araujo , Luiz Eduardo Bassay Blum , Kalpit Shah , Jorge Paz-Ferreiro

Sewage sludge-derived biochar (SSB) is a phosphorus (P) source with potential to replace soluble P fertilizers. However, SSB presents a diversity of P compounds, mainly in mineral forms with different degrees of chemical stability. This hinders the prediction of P bioavailability. In the present study we evaluated P solubility and bioavailability using different chemical extractants. Additionally, the relationships between extractable P and physicochemical properties were evaluated for SSB obtained over a wide range of temperatures (200 °C; 300 °C; 500 °C and 600 °C). Available phosphorus content was extracted using 2% citric acid (P-CA), neutral ammonium citrate + water (P-NAC) and Mehlich 1 solution (0.0125 mol L−1 H2SO4 + 0.050 mol L−1 HCl). Physicochemical properties and extractable P were strongly affected by pyrolysis temperature. Higher pyrolysis temperature resulted in increased pH, BET surface area, pore volume, ash, fixed carbon, Ca, Mg and Zn contents, as well as formation of stable Ca minerals (calcite and oxalate). The total P content increased with pyrolysis temperature (≥300 °C). Nevertheless, the solubility of biochar-P in the extractants presented different trends with temperature. The P-NAC content reached a maximum (79% of TP) at 300 °C and then declined at higher temperatures. Only at 600 °C P-CA and available P were affected by the temperature, where the P-CA increased and available P decreased. Therefore, it is recommended that the P solubility in different extractants should be considered when using SSB as an alternative to inorganic P fertilizers.



中文翻译:

评估污水污泥衍生的生物炭作为新型磷肥的潜力:萃取液和热解温度的影响

污水污泥衍生的生物炭(SSB)是磷(P)来源,具有替代可溶性P肥料的潜力。但是,SSB呈现出多种P化合物,主要是矿物形式的,具有不同程度的化学稳定性。这阻碍了对P生物利用度的预测。在本研究中,我们使用不同的化学提取剂评估了磷的溶解度和生物利用度。此外,针对在宽温度范围(200°C; 300°C; 500°C和600°C)下获得的SSB,评估了可萃取P与理化性质之间的关系。使用2%柠檬酸(P-CA),中性柠檬酸铵+水(P-NAC)和Mehlich 1溶液(0.0125 mol L -1 H 2 SO 4  + 0.050 mol L -1HCl)。热解温度强烈影响其理化性质和可提取的磷。较高的热解温度导致pH值,BET表面积,孔体积,灰分,固定碳,Ca,Mg和Zn含量增加,并形成稳定的Ca矿物(方解石和草酸盐)。总磷含量随热解温度(≥300°C)而增加。然而,生物炭-P在萃取剂中的溶解度随温度呈现出不同的趋势。P-NAC含量在300°C时达到最大值(TP的79%),然后在较高温度下下降。仅在600°C时,P-CA和有效磷受温度影响,其中P-CA升高而有效P降低。因此,建议在使用SSB替代无机磷肥时,应考虑磷在不同萃取剂中的溶解度。

更新日期:2021-02-21
down
wechat
bug