Biodegradation of waste asphalt shingle by white rot fungi
Biodegradation of waste asphalt shingle by white rot fungi
复制标题
DOI：
10.1016/j.jclepro.2021.127448
复制
发表时间：
2021-05-23
影响因子：
11.1
通讯作者：
Huang, Baoshan
中科院分区：
文献类型：
--
作者：
Ding, Yongjie;Wyckoff, Kristen N.;Huang, Baoshan
由于废旧沥青瓦片中多环芳烃的环境问题，传统上采用填埋的方式进行处理，这些物质可能会渗出，造成环境污染。然而，由于对土地资源的担忧，这种处置方法在环境上不那么容易接受，成本效益也比过去低。本研究利用微生物的生物降解性来评估化学需氧量的降解潜力，从而降低多环芳烃(PAHs)含量。研究了白腐菌Phanerochaete chrysosporium对废弃沥青瓦片粘结剂的降解性能。利用傅里叶变换红外光谱(FTIR)和凝胶渗透色谱(GPC)对生物降解过程进行了分析和量化。结果表明，黄孢原毛霉能够降解黄孢原毛霉的粘结剂。凝胶渗透色谱(GPC)分析表明，黄孢原毛霉优先降解沥青小分子。在真菌生物降解过程中，AS粘结剂的PAHs含量最初增加，但随后随着生物降解的进行而下降，降至低于原始带状粘结剂的水平。这项研究的结果可以用来制定废旧沥青瓦片可持续管理的解决方案。
Waste asphalt shingle (WAS) has traditionally been disposed of by landfilling due to environmental concerns surrounding Polycyclic aromatic hydrocarbons in WAS, which may potentially leach out, causing environmental pollution. However, this disposal method has been less environmentally acceptable and less cost effective than in the past due to concern on land resources. This study evaluates the potential of degradation of WAS, therefore reducing the polycyclic aromatic hydrocarbons (PAHs) content, by exploiting microbial biodegradation. The white rot fungus Phanerochaete chrysosporium was tested for its potential to degrade waste asphalt shingle binder. The biodegradation process was analyzed and quantified by both Fourier-transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC). Results illustrate that P. chrysosporium can degrade WAS binder. GPC analysis indicates that the small asphaltic molecules were biodegraded preferentially by P. chrysosporium. The PAHs content of the WAS binder increased initially during fungal biodegradation, but subsequently decreased with the progression in biodegradation to a level lower than that of the original shingle binder. Results from this study could be used to develop solutions to the sustainable management of waste asphalt shingles.