Abstract：
:Benzo [a] pyrene (BaP), the most ubiquitous polycyclic aromatic hydrocarbons (PAHs) found in sludge, can impact the composting processes of sewage sludge as well as the quality of compost produced. In the present study, we investigated the effects of BaP at various concentrations on physicochemical characteristics, heavy metal passivation, and microbial community during the composting processes. The removal efficiency of BaP at 5 and 20 mg kg-1 after composting was 51.1% and 74.2%, respectively. In comparison with the control, the content of residual Cu, Pb, Cr and Ni in 5 mg kg-1 BaP contained system declined dramatically on the second day of composting, while such content in 20 mg kg-1 BaP system significantly decreased on the 8th day. Regardless of the presence of BaP in the sludge, composting process had a positive passivation effect on Cu, Pb, Cr and Ni. A stronger inhibitory effect of BaP at higher concentration was observed on microorganism, which reduced microbial abundance and species in the composting, and influenced microbial diversity. Besides, microbial communities in BaP-containing composting would improve the transformation of silicates and minerals, increase the concentration of humus and extend the passivation time of heavy metals. As these results verified, composting process could remove BaP from the sludge effectively, and BaP had a significant impact on heavy metal passivation and abundance and composition of microbial community during the composting process.
journal_name
Chemospherejournal_title
Chemosphereauthors
Liu H,Yin H,Tang S,Wei K,Peng H,Lu G,Dang Zdoi
10.1016/j.chemosphere.2019.01.180subject
Has Abstractpub_date
2019-05-01 00:00:00pages
517-526eissn
0045-6535issn
1879-1298pii
S0045-6535(19)30199-7journal_volume
222pub_type
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