Modified PVA (polyvinyl alcohol) biomaterials as carriers for simultaneous removal of nitrate, Cd (II), and Mn (II): performance and microbial community

• Published in: Environmental science and pollution research international Vol. 27; no. 22; pp. 28348 - 28359
• Main Authors: Su, Junfeng, Fan, Yuanyuan, Huang, Tinglin, Wei, Li, Gao, Chunyu
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.08.2020; Springer Nature B.V
• Subjects: Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Biocompatibility; Biocompatible Materials; Biomaterials; Biomedical materials; Bioreactors; Cadmium; Copper; Denitrification; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Gas chromatography; Heavy metals; Hydraulic retention time; Iron oxides; Manganese; Microbiota; Microorganisms; Morphology; Next-generation sequencing; Nitrate removal; Nitrates; Nitrogen removal; Polyvinyl Alcohol; Pseudomonas; Reactors; Research Article; Retention time; Toxicity; Waste Water Technology; Wastewater; Water Management; Water Pollution Control; @Cu/PVA; High-throughput sequencing; Denitrification; Cd (II) and Mn (II) removal; Heavy metals; Fe; O; Fe3O4@Cu/PVA
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-020-09114-3

The ecological toxicity and potential risks of heavy metals that coexist with nitrates in wastewater have aroused public attention. This study developed an immobilized Fe 3 O 4 @Cu/PVA mixotrophic reactor (Fe 3 O 4 @Cu/PVA-IMR) to investigate the effect of different Mn (II) concentrations (10 mg L −1 , 50 mg L −1 , and 90 mg L −1 ), Cd (II) concentrations (10 mg L −1 , 20 mg L −1 , and 30 mg L −1 ), and hydraulic retention time (HRT) (6 h, 8 h, and 10 h) on simultaneous nitrate, Cd (II), and Mn (II) removal. Using the advanced modified biomaterial Fe 3 O 4 @Cu/PVA as carrier to embed bacteria, the performance of the reactor was further improved. The surface morphology of Fe 3 O 4 @Cu/PVA was characterized by SEM as a rough surface three-dimensional skeleton structure. When the HRT was 10 h, Mn (II) and Cd (II) concentrations were 40 mg L −1 and 10 mg L −1 , respectively, indicating that the immobilized Pseudomonas sp. H117 with Fe 3 O 4 @Cu/PVA achieved the highest nitrate, Cd (II), and Mn (II) removal efficiencies of 100% (1.64 mg L −1 h −1 ), 98.90% (0.92 mg L −1 h −1 ), and 92.26% (3.58 mg L −1 h −1 ), respectively. Compared with a reactor without Fe 3 O 4 @Cu/PVA addition, the corresponding removal ratio increased by 22.63%, 7.09%, and 15.96%. Gas chromatography (GC) identified nitrogen as the main gaseous product. Moreover, high-throughput sequencing showed that Pseudomonas sp . H117 plays a primary role in the denitrification process.