1. Enhanced biological wastewater treatment supplemented with anaerobic fermentation liquid of primary sludge.
- Author
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Li L, Liao Q, Liu C, Zhang T, Liu C, Chen Z, Gao R, and He Q
- Subjects
- Sewage, Fermentation, Anaerobiosis, Sodium Acetate, Bioreactors, Phosphorus, Carbon, Nitrogen, Glucose, Waste Disposal, Fluid methods, Denitrification, Wastewater, Water Purification methods
- Abstract
The wastewater treatment performance in an inverted A
2 /O reactor supplemented with fermentation liquid of primary sludge was explored comparing to commercial carbon sources sodium acetate and glucose. Similar COD removal rate was observed with the effluent COD stably reaching the discharge standard for those 3 carbon sources. However, the fermentation liquid distributed more carbon source in the anaerobic zone. Fermentation liquid and sodium acetate tests achieved better nitrogen removal rate than glucose test. The fermentation liquid test showed the best biological phosphorus removal performance with the effluent phosphorus barely reaching the discharge standard. The microbial community characterization revealed that the fermentation liquid test was dominated by phylum Proteobacter in all the anoxic, anaerobic and aerobic zones. Denitrifying phosphorus accumulating organisms (PAOs) (i.e., genera Dechloromonas and unclassified_f__Rhodocyclaceae) were selectively enriched with high abundances (over 20%), which resulted in improved phosphorus removal efficiency. Moreover, the predicted abundances of enzymes involved in nitrogen and phosphorus removal were also enhanced by the fermentation liquid., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
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