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Straw Degradation Behaviors under Different Conditions of Relative Air Humidity and Ultraviolet-A Irradiation

文献类型: 外文期刊

作者: Li, Yunlong 1 ; Huang, Hongying 1 ; Wu, Guofeng 1 ; Chang, Zhizhou 1 ;

作者机构: 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China

2.Nanjing Normal Univ, Coll Life Sci, Nanjing 210023, Jiangsu, Peoples R China

关键词: Relative air humidity;Ultraviolet-A irradiation;Photodegradation;Biodegradation;TGA;ATR-FTIR;BIOLOG;SEM

期刊名称:BIORESOURCES ( 影响因子:1.614; 五年影响因子:1.923 )

ISSN: 1930-2126

年卷期: 2016 年 11 卷 4 期

页码:

收录情况: SCI

摘要: In this study, straw was degraded continuously for 150 days under one of three levels of relative air humidity (RH) (90%, 60%, or 30%) to estimate the effect of humidity on straw biodegradation. Moreover, straw was treated with ultraviolet (UV)-A irradiation + 90% RH for 180 days to evaluate the interaction between photodegradation and biodegradation. The effects of 30% and 60% RH on straw degradation was inconspicuous. Straw mass losses at 90% RH and UV-A + 90% RH were 18.5% and 39.1%, respectively. BIOLOG analysis showed that filamentous fungi played a major role in straw biodegradation. Thermogravimetric analysis showed that treatment with UV-A + 90% RH tended to increase the maximum pyrolysis rate and decreased the initial pyrolysis temperature. Compared with 90% RH, infrared spectra analysis showed that functional groups of UV-A + 90% RH treatment, e.g., -CH, -C=O, and the benzene ring structure, clearly decreased. Strawdegrading bacteria were observed by scanning electron microscopy at the beginning and end of UV-A + 90% RH treatment. Results highlight the role of humidity in the degree of straw biodegradation by filamentous fungi. Straw degradation is accelerated by the combined action of photodegradation and biodegradation under high UV-A irradiation and high humidity.

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