AI Article Synopsis
- The study utilized activated sludge from an A/O process in a wastewater treatment plant to enhance the growth of nitrifying bacteria through a continuous ammonia feeding in a self-circulating tank.
- After 38 days, the ammonia oxidation rate had reached about 275.58 mg (L h) and a significant increase in ammonia-oxidizing bacteria was observed, with their proportion rising from 0.43% to 61.91%.
- The enriched sludge, when immobilized using polyvinyl alcohol, showed an effective ammonia oxidation rate of 44.61 mg (L h) in treating municipal wastewater, achieving effluent ammonia levels below 1 mg L, while SEM analysis indicated a porous structure that supports bacterial growth.
Article Abstract
Activated sludge from the A/O process in a wastewater treatment plant (WWTP) was used as the seed sludge for enrichment to achieve faster growth of nitrifying bacteria and higher nitrification efficiency of the filler made by nitrifying bacteria. The bacterial community was enriched in a self-circulating bacteria culture tank by a continuous ammonia feeding mode. The study found that the nitrifying bacteria community was enriched in 38 days with the ammonia oxidation rate of approximately 275.58 mg (L h). High-throughput sequencing demonstrated that belonging to ammonia-oxidizing bacteria (AOB) was predominant in the sludge after 38 days at a ratio extending from 0.43% to 61.91%. The enriched sludge was used as the bacterial source and the immobilization was carried out with polyvinyl alcohol (PVA). After the recovery culture, the ammonia oxidation rate of the filler was up to 44.61 mg (L h) for the treatment of municipal wastewater, and the effluent ammonia was below 1 mg L, indicating that the immobilized filler is effective for municipal wastewater nitrification. Scanning electron microscope (SEM) observations showed that immobilized fillers were highly porous and bacteria adhered to the network structure, demonstrating that the filler provided a good growth microenvironment for microorganisms.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9054103 | PMC |
| http://dx.doi.org/10.1039/d0ra01498b | DOI Listing |
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