AI Article Synopsis
- The study examined how different carbon/nitrogen (C/N) ratios in sequencing batch biofilm reactors (SBBR) affect nitrogen removal from mariculture effluent, finding that a higher C/N ratio led to impressive nitrogen removal rates, achieving 95% for ammonia nitrogen and 73% for total nitrogen at a ratio of 30.
- The effect of the seed sludge was minimal, but a higher C/N ratio resulted in more tightly bound extracellular polymeric substances (TB-EPS), which closely correlated with nitrogen removal efficiency.
- Additionally, while high C/N ratios inhibited certain ammonia-oxidizing archaea and bacteria, they promoted other bacteria involved in nitrogen removal, highlighting the importance of C/N ratios in optimizing biological processes for wastewater treatment
Article Abstract
The impact of carbon/nitrogen (C/N) ratio on sequencing batch biofilm reactor (SBBR) initiated with different seed sludges for treating actual mariculture effluent was explored. Increasing the C/N ratio significantly enhanced the nitrogen removal efficiency, achieving average removal efficiency of 95% for ammonia nitrogen and 73% for total nitrogen at ratio of 30, while the impact of seed sludge was minimal. High C/N ratio promoted the secretion of tightly bound extracellular polymeric substances (TB-EPS), which showed significant correlation with nitrogen removal. Interactions between bacteria and archaea were enhanced and conditionally rare or abundant taxa were the keystone taxa. High C/N ratio inhibited the relative abundance of ammonia-oxidizing archaea (Candidatus_Nitrosopumilus) and bacteria (Nitrosomonas), but promoted the heterotrophic nitrification-aerobic denitrification bacteria (Halomonas). The expression of nitrogen removal functional genes significantly correlated with functional genera. This study emphasized the crucial role of high C/N ratios in biological nitrogen removal from actual mariculture effluent.
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| http://dx.doi.org/10.1016/j.biortech.2024.131838 | DOI Listing |
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