期刊
CHEMOSPHERE
卷 280, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.130917
关键词
Dissimilatory nitrate reduction to ammonium (DNRA); Denitrification; Organic carbon; Nitrogen removal; Biofilters
资金
- National Key Research & Development Program of China [2018YFD0900701]
- Strategic Priority Research Program of the Chinese Academy of Science [XDA23040403]
- National Natural Science Foundation of China [41877381, 42077314, 91951119, 41701557]
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07603]
- State Key Laboratory of Freshwater Ecology and Biotechnology [2019FBZ01]
The study found that high organic carbon content in matrix facilitated dissimilatory nitrate reduction to ammonium (DNRA) over denitrification (DEN), while low organic carbon content promoted DEN. It was also observed that using corn cob as OC source in biofilters was more effective than bagasse due to slow and continuous release of organic carbon. Choosing suitable OC source and regulating its dosage are crucial for enhancing nitrate removal and reducing ammonium accumulation in biofilters.
The effect of organic carbon (OC) quality and quantity on switch between dissimilatory nitrate reduction to ammonium (DNRA) and denitrification (DEN) was studied in biofilter systems. High OC in matrix could promote significantly nitrate (NO3--N) removal due to the reinforce of DEN. Sodium acetate (SA) addition in influent further fueled NO3--N removal in groups with low OC in matrix but increased ammonium (NH4+-N) and nitrite (NO3--N) accumulation in groups with high OC in matrix. This indicated that high OC combined different species, facilitated the DNRA over DEN. Compared to bagasse, corncob was the better suitable OC source in matrix for DEN due to slow and continuous release of OC. Hence, in order to promote NO3--N removal and decline NH4+-N accumulation in biofilters, it is very important to screen suitable OC source (mixed utilization of multiple C sources is recommended) and regulate its dosage (below 80 mg L-1).
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