1. Efficient removal of nitrate, manganese, and tetracycline by a polyvinyl alcohol/sodium alginate with sponge cube immobilized bioreactor.
- Author
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Chang, Qiao, Ali, Amjad, Su, Junfeng, Wen, Qiong, Bai, Yihan, Gao, Zhihong, and Xiong, Renbo
- Subjects
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TETRACYCLINE , *TETRACYCLINES , *CUBES , *MANGANESE , *SCANNING electron microscopes , *ELECTRON donors , *SODIUM alginate , *POLYVINYL alcohol - Abstract
[Display omitted] • A new microbial immobilized carrier, PVA/SA@sponge cube was synthesized. • Immobilized bioreactor has the ability to simultaneously remove NO 3 −-N, Mn(II) and TC. • As an electron donor, Mn(II) was transformed into MnO 2 and MnCO 3 by microorganism. • Zoogloea was proved as the dominant contributor in reactor operation. The co-existence of nitrate, manganese (Mn), and antibiotics are of a wide concern. In this study, a denitrifying and manganese-oxidizing Zoogloea Q7 bacterium was immobilized using polyvinyl alcohol/sodium alginate with sponge cube (PVA/SA@sponge cube) in the reactor. The optimal operation parameters of the bioreactor were explored. Maximum nitrate, Mn(II), and tetracycline (TC) removal efficiencies of 93.00, 72.34, and 57.32% were achieved with HRT of 10 h, pH of 6.5, Mn(II) concentration of 20 mg L−1, and TC of 1 mg L−1, respectively. Fluorescence excitation-emission matrix (EEM) proved that the microorganism in the bioreactor was greatly active. Scanning electron microscope (SEM) images demonstrated that Zoogloea Q7 was commendably immobilized on the novel material. X-ray diffraction (XRD) analysis suggested that the bioprecipitate was mainly composed of MnO 2 and MnCO 3. Through high-throughput analysis, Zoogloea sp. Q7 was considered to be the dominant bacteria present in the bioreactor. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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