期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 292, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.120988
关键词
Anammox; Bioactivity; Calcium content; Deactivation mechanism; Porosity
资金
- National Natural Science Foundation of China [52100056]
- Starting Research Fund of Taizhou University [QD2021080]
This study investigated the impact of high-concentration calcium on anammox performance and identified the potential mechanisms. The results showed that increasing calcium concentration led to a decrease in the dominant genus Ca. Kuenenia and specific anammox activity. However, the inhibition was reversible and could be recovered over time.
High-concentration calcium was contained in some wastewater, e.g., leachate. In this study, the response of the anammox performance to calcium (similar to 2000 mg/L) and the potential mechanisms were investigated in the serum bottles. 5 runs were conducted and 12 bottles were operated in each run, i.e., B1-3 (control), B4-6 (100 mg/L Ca2+), B7-9 (500 mg/L Ca2+) and B10-12 (2000 mg/L Ca2+). The dominant genus Ca. Kuenenia decreased from 19.3% to 3.8% with the increase of the calcium concentration in the bulk according to the taxonomy analysis. However, the specific anammox activity (SAA) only decreased from 5.8 +/- 0.1 to 0.9 +/- 0.02 mgN/(gVSS.h) in Run 1 when the calcium dosage was 2000 mg/L. Specifically, the SAA was only 16.1% that of the control in Run 1, however, the inhibition was reversible and the SAA regained to 73.2% that of the control in Run 5. Meanwhile, the porosity decreased from 82.4% to 69.9% at 2000 mg/L Ca2+. Calcium content in the granules with 2000 mg/ L Ca2+ was 7.8 times that of the control after Run 5. Therefore, the calcium precipitates blocking the granular pores was deduced to be responsible for the decline of the SAA.
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