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Dynamics of bacterial metabolic profile and community structure during the mineralization of organic carbon in intensive swine farm wastewater.
- Source :
-
Chilean Journal of Agricultural Research . Jun2015, Vol. 75 Issue 2, p224-231. 8p. - Publication Year :
- 2015
-
Abstract
- Land application of intensive swine farm wastewater has raised serious environmental concerns due to the accumulation and microbially mediated transformation of large amounts of swine wastewater organic C (SWOC). Therefore, the study of SWOC mineralization and dynamics of wastewater microorganisms is essential to understand the environmental impacts of swine wastewater application. We measured the C mineralization of incubated swine wastewaters with high (wastewater H) and low (wastewater L) organic C concentrations. The dynamics of bacteria metabolic profile and community structure were also investigated. The results showed that SWOC mineralization was properly fitted by the two-simultaneous reactions model. The initial potential rate of labile C mineralization of wastewater H was 46% higher than that of wastewater L, whereas the initial potential rates of recalcitrant C mineralization of wastewaters H and L were both around 23 mg L-1 d-1. The bacterial functional and structural diversities significantly decreased for both the wastewaters during SWOC mineralization, and were all negatively correlated to specific UV absorbance (SUVA254; P < 0.01). The bacteria in the raw wastewaters exhibited functional similarity, and both metabolic profile and community structure changed with the mineralization of SWOC, mainly under the influence of SUVA254 (P < 0.001). These results suggested that SWOC mineralization was characterized by rapid mineralization of labile C and subsequent slow decomposition of recalcitrant C pool, and the quality of SWOC varied between the wastewaters with different amounts of organic C. The decreased bio-availability of dissolved organic matter affected the dynamics of wastewater bacteria during SWOC mineralization. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07185820
- Volume :
- 75
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Chilean Journal of Agricultural Research
- Publication Type :
- Academic Journal
- Accession number :
- 103663778
- Full Text :
- https://doi.org/10.4067/S0718-58392015000200012