Enhanced bioremediation of PAH-contaminated soil by wheat bran and microbial community response

ABSTRACT

Microcosms were set up containing a PAH polluted soil to investigate biostimulation (addition of wheat bran and fertilizer) and bioaugmentation (inoculation with Pseudomonas sp. SB). After 60 d the fertilizer + wheat bran gave the highest PAH degradation. The degradation rate was 42.2%, significantly higher than the 18.7% in the fertilizer only treatment. Principal coordinate analysis (PCoA) indicates that wheat bran treatment can significantly alter soil bacterial and fungal communities. In addition, wheat bran promoted the enrichment of some soil bacteria such as Bacillaceae, Xanthomonadaceae, Streptomycetaceae, and Chitinophagaceae, and the fungi Talaromyces, Humicola, unclassified_Chaetomiaceae and Mortierella. These results highlight the potential of wheat bran application to reduce the PAHs detected in soil.

KEYWORDS:

• Bacterial community
• biostimulation
• fungal community
• PAH degraders
• wheat bran

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [41671325,U1662110]; Natural Science Foundation of Jiangsu Province, China [BK20171521]; The Siminarity and key Technological Innovation Projects of Key Industries in Chongqing, China [cstc2016zdcy-zd20001].