农业工程学报2020，Vol.36Issue(6)：239-245,7.DOI:10.11975/j.issn.1002-6819.2020.06.028
玉米秸秆与污泥混合热解对生物碳特性及重金属的影响
Effects of maize stovers and sewage sludge co-pyrolysis on characteristics and heavy metals in biochar
摘要
Abstract
Maize stovers were mixed with sewage sludge at different proportions (0, 25％, 50％ and 75％) and treated in a pyrolysis device up to 600℃ via a co-pyrolysis process. Four kinds of biochars (SCB0, SCB25, SCB50 and SCB75) were obtained respectively. The properties of biochars, heavy metals (Cu, Zinc, Pb, Ni, Cr, Mn and As) contents, BCR forms and TCLP leaching toxicity characteristics were studied and the potential ecological risks were evaluated. The results showed that with the increase of maize stover content, the biochar yield, ash content, H/C and N/C ratios were significantly reduced while the pH value and the aromatization degree of biochar were significantly increased. After co-pyrolysis with maize stovers, the morphology of heavy metals in the resultant biochar changed significantly. The residue fraction ratio of Cu, Zn, Ni and Cr was significantly increased, indicating that pyrolysis might promote the transformation of heavy metals into more stable forms. All the heavy metals leached from biochars obtained by mixed pyrolysis did not exceed the limit stipulated by GB5085.3-2007 leaching toxicity identification standard and the overall potential risk index was further reduced . The ecological risk was significantly reduced from the moderate to the slight risk level and the minimum risk level reached when the addition amount of maize stover was 50％. The current study might provide a theoretical basis for the resource utilization and harmless utilization of sewage sludge and maize stovers.关键词
秸秆/污泥/重金属/混合热解/形态分析/风险评价Key words
straw/sludge/heavy metals/co-pyrolysis/speciation analysis/risk assessment分类
农业科技引用本文复制引用
蔡尽忠,李火金,邓盈..玉米秸秆与污泥混合热解对生物碳特性及重金属的影响[J].农业工程学报,2020,36(6):239-245,7.基金项目
Undergraduate Training Programs for Innovation and Entrepreneurship(201912709015) （201912709015）
Education and Scientific Research Project of Middle and Young Teachers in Fujian Province (JAT191005) （JAT191005）
