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- Title
Preparation of Immobilized Sulfate-Reducing Bacteria-Microalgae Beads for Effective Bioremediation of Copper-Containing Wastewater.
- Authors
Li, Yongchao; Yang, Xiaoyan; Geng, Bing
- Abstract
A strain of <italic>Desulfovibrio</italic> sp<italic>.</italic> sulfate-reducing bacteria (SRB) was isolated from a sludge sample. Novel immobilized SRB beads with microalgae (<italic>Chlorella vulgaris</italic>, <italic>Scenedesmus obliquus</italic>, <italic>Selenastrum capricornutum</italic>, and <italic>Anabaena spiroides</italic>) as the carbon source were prepared and then used to treat wastewater containing 60 mg/L Cu(II) and 600 mg/L sulfate in batch experiments. The microalgae were first degraded by co-existing fermentative bacteria into fatty acids, which then served as a carbon source for SRB. The solution chemical oxygen demand was significantly lower with microalgae substrates than with ethanol as a substrate. Different immobilization methods were evaluated with an orthogonal design, which indicated that the compositional parameters for preparing immobilized beads with an optimal sulfate reduction rate were polyvinyl alcohol (2%), sodium alginate (1%), calcium chloride (6%), silica sand (1%), and a 50-mL volume of SRB suspension. SRB activity in the immobilized beads was distinctly enhanced compared with that of suspended SRB. At an initial pH of 5.5, 72.4-74.4% of sulfate and over 91.7% of Cu(II) were removed, indicating that immobilized SRB beads with plentiful low-cost microalgae as a nutrient source may be an efficient method for acid mine drainage treatment.
- Subjects
SULFATE-reducing bacteria; MICROALGAE; BIOREMEDIATION; FATTY acids; WASTEWATER treatment
- Publication
Water, Air & Soil Pollution, 2018, Vol 229, Issue 3, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-018-3709-1