Comparison of sulphide and nitrate removal from synthetic wastewater by pure and mixed cultures of nitrate-reducing, sulphide-oxidizing bacteria.

Bioresour Technol

Biofuels by Biocatalysts Research Unit, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address:

Published: January 2019

In this study, the activities of hydrogen sulphide (HS) oxidation and nitrate (N-NO) reduction by three pure and mixed strains of nitrate-reducing, sulphide oxidizing bacteria (NR-SOB) were determined. Batch experiments were performed at 35 °C and pH 7.0-8.0 with initial HS concentrations of 650-900 ppm and N-NO concentrations of ∼120 mg/L. The strains MAL 1HM19, TPN 1HM1 and TPN 3HM1 were capable of removing 100% gas-phase HS. The co-cultures showed better performance for HS and N-NO removal. The mixed NR-SOB strains showed a higher HS oxidation rate (143 ± 18 ppm/h), while the highest N-NO removal rate (5.5 ± 0 and 5.1 ± 0.6 N-NO mg/L·h) was obtained by a mixture of two NR-SOB strains. The 16S rDNA sequence analysis revealed that all strains belonged to the sub-class Alphaproteobacteria and are closely related to Paracoccus sp. (>99%).

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http://dx.doi.org/10.1016/j.biortech.2018.09.125DOI Listing

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