| Literature DB >> 31879873 |
Haiqing Xu1, Liang Guo2,3,4, Shiliang Guo1, Yi Wang5, Zonglian She1, Mengchun Gao1, Yangguo Zhao1, Chunji Jin1.
Abstract
This work evaluates the impact of the different concentrations of Fe3O4 on nitrate removal and organic matters utilization in the sequencing batch reactors (SBRs) using the sludge alkaline digestion supernatant as external sludge carbon source. Results indicated that the optimal concentration of Fe3O4 was 1 g/L for enhancing denitrification with NO3--N removal efficiency of 93.13% (up to a 11.93% increase) and without NO2--N accumulation after 18 days. The changes of soluble chemical oxygen demand (SCOD), protein, and carbohydrate during denitrification process were analyzed to gauge the utilization of sludge fermentation products by denitrifiers. The SCOD was consumed for organisms involved in NO3--N removal and the Fe3O4 could promote the utilization of carbohydrate better than protein by denitrifiers during denitrification process. Denitrification rate (VDN) and the nitrate-to-nitrite transformation ratio (NTR), as the kinetics parameters, were also investigated in different concentrations of Fe3O4.Entities:
Keywords: Anaerobic fermentation; Carbon source; Fe3O4; Nitrate removal; Sequencing batch reactors; Waste sludge
Mesh：
Substances：
Year: 2019 PMID： 31879873 DOI： 10.1007/s11356-019-07461-4
Source DB: PubMed Journal: Environ Sci Pollut Res Int ISSN： 0944-1344 Impact factor: 5.190