1. Combination of bioaugmentation and biostimulation for remediation of paddy soil contaminated with 2,4-dichlorophenoxyacetic acid.
- Author
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Yang, Zhiman, Xu, Xiaohui, Dai, Meng, Wang, Lin, Shi, Xiaoshuang, and Guo, Rongbo
- Subjects
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SOIL pollution , *DICHLOROPHENOXYACETIC acid , *HYDROGEN production , *NUCLEOTIDE sequencing , *BACTERIAL communities - Abstract
The batch and fed-batch tests were performed to evaluate the efficiency of bioaugmentation in combination with biostimulation for remediation of paddy soil contaminated with 2,4-dichlorophenoxyacetic acid (2,4-D). 2,4-D degrading enrichments were used for bioaugmentation, and effluents prepared through biological hydrogen production process were used as substrate for biostimulation. The batch tests indicated that 2,4-D degradation depended on the enrichment/substrate ratio (E/S), where E/S of 0.03 showed an excellent performance. The fed-batch tests showed that biostimulation only led to an improvement in 2,4-D degradation, while the pattern of repeated augmentation of enrichments (FRA) together with biostimulation obviously improved degradation of 2,4-D, 2-chlorophenol (2-CP) and phenol. DNA-sequencing approach showed that the FRA pattern altered the bacterial community composition, and high removal of 2,4-D, 2-CP and phenol may be attributed to the acclimation and persistence of Thauera . The findings demonstrated the importance of the FRA pattern on remediation of paddy soil contaminated with 2,4-D. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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