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首页> 美国卫生研究院文献>Springer Open Choice >Studying the Effects of Two Various Methods of Composting on the Degradation Levels of Polycyclic Aromatic Hydrocarbons (PAHs) in Sewage Sludge
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Studying the Effects of Two Various Methods of Composting on the Degradation Levels of Polycyclic Aromatic Hydrocarbons (PAHs) in Sewage Sludge

机译：研究两种堆肥方法对污水污泥中多环芳烃（PAHs）降解水平的影响

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The research comprised of studying the effect composting sewage sludge with sawdust and vermicomposting with earthworm Eisenia fetida has on the degradation of 16 polycyclic aromatic hydrocarbons (PAHs). Raw rural sewage sludge prior composting was more contaminated with PAHs than urban sewage sludge, in both cases exceeding EU cutoff limits of 6 mg/kg established for land application. Dibenzo[a,h]anthracene (DBahAnt), acenaphtylene (Acy) and indeno[1,2,3-c,d]pyrene (IPyr) were predominant in rural sewage sludge, whilst the urban sewage sludge contained the highest concentrations of benzo[b]fluoranthene (BbFl), benzo[k]fluoranthene (BkFl) and indeno[1,2,3-c,d]pyrene (IPyr). Thirty days of composting with sawdust has caused a significant reduction of 16 PAHs on average from 26.07 to 4.01 mg/kg (84.6%). During vermicomposting, total PAH concentration decreased on average from 15.5 to 2.37 mg/kg (84.7%). Vermicomposting caused full degradation of hydrocarbons containing 2 and 6 rings and significant reduction of PAHs with 3 aromatic rings (94.4%) as well as with 5 aromatic rings (83.2%). The lowest rate of degradation (64.4%) was observed for hydrocarbons with 4 aromatic rings such as fluoranthene, benzo(a)anthracene, chrysene and pyrene. On the other hand, the highest level of degradation was determined for PAHs with 2 rings (100%), 3 rings (88%) and 6 aromatic rings in the molecule (86.9%) after composting with sawdust. Acenaphthene and pyrene were found to be the most resistant to biodegradation during both composting methods.
机译：这项研究包括研究用锯末堆肥污泥和用et Eisenia fetida进行ver堆肥对16种多环芳烃（PAHs）降解的影响。在两种情况下，农村堆肥前堆肥的原始农村污泥比城市污泥受PAHs污染的程度更高，两种情况均超过了欧盟规定的土地使用极限值6 mg / kg。农村污水污泥中以二苯并[a，h]蒽（DBahAnt），cen庚啶（Acy）和茚并[1,2,3-c，d] py（IPyr）为主，而城市污水污泥中苯并苯的浓度最高。 [b]荧蒽（BbF1），苯并[k]荧蒽（BkF1）和茚并[1,2,3-c，d] py（IPyr）。用木屑堆肥30天已使16种多环芳烃的平均含量从26.07大大降低至4.01 mg / kg（84.6％）。在ver堆肥期间，总的PAH浓度平均从15.5降至2.37 mg / kg（84.7％）。 com堆肥导致含2和6个环的烃完全降解，并带有3个芳环（94.4％）和5个芳环（83.2％）的PAHs显着降低。对于具有4个芳环的烃，如荧蒽，苯并（a）蒽，和pyr，观察到最低的降解率（64.4％）。另一方面，用木屑堆肥后，分子中有2个环（100％），3个环（88％）和6个芳环（86.9％）的PAHs的降解水平最高。发现在两种堆肥方法中，ena和pyr对生物降解的抵抗力最大。

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