AI Article Synopsis
- Microbial degradation of thiocyanate (SCN) is unstable, necessitating a deeper understanding of mechanisms involved in its breakdown.
- Respirometry, batch tests, and DNA sequencing revealed that an uncultured Thiobacillus species was the dominant microbe in treating SCN-rich coke wastewater, sharing metabolic traits with known Thiobacillus species.
- High concentrations of SCN and the presence of substances like NH-N, phenol, and hydroxylamine negatively impacted degradation efficiency, indicating a need for optimized strategies to meet regulatory limits for SCN in wastewater treatment.
Article Abstract
Microbial degradation of thiocyanate (SCN) has been reported to suffer from instability highlighting the need for improved understanding of underlying mechanisms and boundaries. Respirometry, batch tests and DNA sequencing analysis were used to improve understanding of a mixed culture treating coke wastewater rich in SCN. An uncultured species of Thiobacillus was the most abundant species (26%) and displayed similar metabolic capabilities to Thiobacillus denitrificans and Thiobacillus thioparus. Thiocyanate was hydrolysed/oxidised to NH-N, HCO and SO. Nevertheless, at 360-2100 mg SCN/L a breakdown in the degradation pathway was observed. Respirometry tests demonstrated that NH-N was inhibitory to SCN degradation (IC: 316 mg/L). Likewise, phenol (180 mg/L) and hydroxylamine (0.25-16 mg/L) reduced SCN degradation by 41% and ca. 7%, respectively. The understanding of the SCN degradation pathways can enable stable treatment efficiencies and compliance with effluent of <4 mg SCN/L, required by the Industrial Emissions Directive.
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| http://dx.doi.org/10.1016/j.biortech.2019.121524 | DOI Listing |
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