化工学报 ›› 2021, Vol. 72 ›› Issue (10): 5344-5353.DOI: 10.11949/0438-1157.20210502

• 能源和环境工程 • 上一篇    下一篇

粒径对餐厨沼渣热解制备生物炭中磷和重金属的影响

王玉1,2(),余广炜1,3(),江汝清1,2,林佳佳1,2,汪印1   

  1. 1.中国科学院城市环境研究所,中国科学院城市污染物转化重点实验室,福建 厦门 361021
    2.中国科学院大学,北京 100049
    3.福建省城市固体废弃物资源化工程技术研究中心,福建 厦门 361021
  • 收稿日期:2021-04-13 修回日期:2021-07-02 出版日期:2021-10-05 发布日期:2021-10-05
  • 通讯作者: 余广炜
  • 作者简介:王玉(1996—),男,硕士研究生,yuwang@iue.ac.cn
  • 基金资助:
    国家重点研发计划项目(2020YFC1908904);中国科学院A类战略性先导科技专项(XDA23020504);福建省自然科学基金项目(2019J01135)

Effect of particle size on phosphorus and heavy metals during the preparation of biochar from food waste biogas residue

Yu WANG1,2(),Guangwei YU1,3(),Ruqing JIANG1,2,Jiajia LIN1,2,Yin WANG1   

  1. 1.CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China
    2.University of Chinese Academy of Sciences, Beijing 100049, China
    3.Fujian Municipal Solid Waste Resource Recovery Technology Research Center, Xiamen 361021, Fujian, China
  • Received:2021-04-13 Revised:2021-07-02 Online:2021-10-05 Published:2021-10-05
  • Contact: Guangwei YU

摘要:

以3种粒径餐厨沼渣为原料,在600℃下热解制备生物炭,研究粒径对沼渣(BR)及生物炭(BRC)中磷和重金属的影响,并采用TCLP浸出毒性和重金属潜在生态风险评估对其安全性进行系统研究。结果表明:BR及BRC中的磷主要以酸溶态磷(HCl-P)为主,残渣态磷(Res-P)次之,其余磷形态含量较低,总磷含量均呈现出随粒径增大而降低的趋势。热解促进H2O-P、NaHCO3-P和NaOH-P向HCl-P和Res-P转化。随着粒径的增大,BR中Cu、Zn总量增加,Cr减少,BRC中的Cr、As总量增加,Zn、Pb减少。并且BR中Cr、Zn、Pb和As中可氧化态和残渣态F3+F4随粒径增大而减少;BRC中Cr、Pb、As中F3+F4随粒径增大而减少,而Cu、Zn、Cd与之相反。TCLP浸出毒性和重金属潜在生态风险评估结果表明BR及BRC中重金属均属于低风险水平。

关键词: 粒径, 餐厨沼渣, 生物炭, 热解, 磷, 重金属, 生态风险评估, 废物处置

Abstract:

In this paper, biochar (BRC) produced from biogas residue (BR) with three particle sizes (d≤0.15 mm, 0.15 mm <d≤0.25 mm, d>0.25 mm) were obtained by pyrolysis at 600℃. The effects of different particle sizes on the migration and transformation of phosphorus and heavy metals between BR and BRC were systematically studied. And toxicity characteristic leaching procedure (TCLP) leaching toxicity test and potential ecological risk assessment were used to evaluate the safety risk of BR and BRC. The results showed that the phosphorus in BR and BRC were mainly acid-soluble phosphorus (HCl-P), followed by residual phosphorus (Res-P), and the contents of other phosphorus forms were low. TP content showed a decreasing trend with increase of particle size in BR and BRC. Pyrolysis can promote the conversion of H2O-P, NaHCO3-P and NaOH-P to HCl-P and Res-P. As the particle size increases, the total amount of Cu and Zn in BR increases, while the amount of Cr decreases, the total amount of Cr and As in BRC increases, and the total amount of Zn and Pb decreases. Meanwhile, the F3+F4 fractions (oxidizable and residue fraction) of Cr, Zn, Pb, As in BR and that of Cr, Pb, As in BRC decreased with the increase of particle size, while Cu, Zn and Cd of BRC showed an opposite trend. The assessment results of TCLP leaching toxicity and potential ecological risk of heavy metals indicate that the heavy metals in BR and BRC are at low risk levels.

Key words: particle size, biogas residue, biochar, pyrolysis, phosphorus, heavy metals, ecological risk assessment, waste treatment

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