A moving-bed biofilm reactor (MBBR) containing immobilized Acinetobacter sp.CN86 was operated to investigate the simultaneous denitrification, bio-mineralization and cadmium removal performance. Effects of hydraulic residence time (HRT) (4 h, 6 h and 8 h), pH (6.0, 7.0 and 8.0) and influent Cd concentrations (10 mg/L, 30 mg/L and 50 mg/L) were assessed on the simultaneous removal of nitrate, Cd and Ca. Results indicate that the highest pollutant removal efficiency (98.33% (1.866 mg/L·h) for NO-N; 99.36% (1.242 mg/L·h) for Cd; 68.80% (15.480 mg/L·h) for Ca) was achieved under the conditions of a hydraulic residence time of 8 h, pH of 7.0 and initial Cd concentration of 10 mg/L. Analyses of microbial distribution and community structures showed that Acinetobacter sp.CN86 was the main contributor (occupy 15.3% at the species level) to the effective removal of multiple pollutants in the MBBR. In addition, the main gas and precipitation components in the biofilm reactor were identified by gas chromatography, scanning electron microscope, and X-ray diffraction analyses.
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| http://dx.doi.org/10.1016/j.jenvman.2019.109548 | DOI Listing |
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