Removal of cadmium by bioflocculant produced by Stenotrophomonas maltophilia using phenol-containing wastewater
| Autor: | Hudson Berkhouse, Youlang Zhang, Wanyu Lu, Honggao Chen, Yongbing Yang, Jiangang Zhou, Yao Lv, Chunying Zhong |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Flocculation Environmental Engineering Stenotrophomonas maltophilia Health Toxicology and Mutagenesis chemistry.chemical_element Wastewater 010501 environmental sciences 01 natural sciences Microbiology chemistry.chemical_compound Phenols 010608 biotechnology Chemical Precipitation Environmental Chemistry Phenol 0105 earth and related environmental sciences Cadmium biology Temperature Public Health Environmental and Occupational Health General Medicine General Chemistry Hydrogen-Ion Concentration biology.organism_classification Pulp and paper industry Pollution Carbon Oxygen Waste treatment chemistry Fermentation Sewage treatment |
| Zdroj: | Chemosphere. 155:163-169 |
| ISSN: | 0045-6535 |
| Popis: | Bioflocculants have been applied in numerous applications including heavy metals removal. A major bottleneck for commercial application of bioflocculant is its high production cost. Phenol-containing wastewater are abundantly available. However, the toxic phenol inhibited the microbial activities in the subsequent fermentation processes. Consequently, strains that can secrete phenol-degrading enzymes and simultaneously produce bioflocculants through directly degrading the phenol are of academic and practical interests. A phenol-degrading strain, Stenotrophomonas maltophilia ZZC-06, which can produce the bioflocculant MBF-06 using phenol-containing wastewater, was isolated in this study. The effects of culture conditions including initial pH, dissolved oxygen, phenol concentration, inoculum size, and temperature on MBF-06 production were analyzed. The experimental results showed that over 90% flocculating activity was achieved when the phenol was used as a carbon source and 4.99 g/L of MBF-06 was achieved under the optimized condition: 2.0% dissolved oxygen, 800 mg/L phenol concentration, 10% inoculum size, an initial pH of 6.0, and a temperature of 30 °C. The bioflocculant MBF-06 contained 71.2% polysaccharides and 27.9% proteins. The feasibility of cadmium removal using MBF-06 was evaluated. The highest flocculating efficiency for cadmium was 81.43%. This study shows for the first time that Stenotrophomonas maltophilia ZZC-06 can directly convert phenol into a bioflocculant, which can be used to effectively remove cadmium. |
| Databáze: | OpenAIRE |
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