AI Article Synopsis
- A novel integrated sulfur fixed-film activated sludge system (ISFAS-SBR) effectively treats low carbon/nitrogen (C/N) ratio municipal wastewater, significantly reducing effluent total inorganic nitrogen (TIN) and phosphorus levels.
- Microbial activities, including catalase, NADH, and extracellular polymeric substances (EPS), help mitigate oxidative stress, enhancing cell activity and nitrogen removal efficiency through autotrophic denitrification.
- The system promotes a balanced microbial community that optimizes carbon, nitrogen, and sulfur metabolism, highlighting its potential as a viable method for wastewater treatment.
Article Abstract
A novel integrated sulfur fixed-film activated sludge in SBR system (ISFAS-SBR) was proposed to treat the low C/N ratio municipal wastewater. The effluent total inorganic nitrogen (TIN) and PO-P decreased from 17 mg/L and 3.5 mg/L to 8.5 mg/L and 0.5 mg/L, and higher nitrogen removal efficiency was contributed by the autotrophic denitrification. Microbial response characteristics showed that catalase (CAT), reduced nicotinamide adenine dinucleotide (NADH) and extracellular polymeric substance (EPS) alleviated the oxidative stress of sulfur carrier to maintain cell activity, while metabolic activity analysis indicated that the electron transfer rate was enhanced to improve mixotrophic denitrification efficiency. Meanwhile, the increased key enzyme activities further facilitated nitrogen removal and sulfur oxidation process. Additionally, the microbial community, functional proteins and genes revealed a niche equilibrium of C, N, S metabolic bacteria. Sulfur autotrophic in-situ coupled SBR system enlarged a promising strategy for treatment of low C/N ratio municipal wastewater.
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| http://dx.doi.org/10.1016/j.biortech.2023.129609 | DOI Listing |
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