A novel two-phase bioreactor for microbial hexavalent chromium removal from wastewater
| Autor: | N. Dimopoulos, Gerasimos Lyberatos, G. M. Lytras, G. Malavetas, D. Argyropoulou, C. Lytras |
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| Rok vydání: | 2017 |
| Předmět: |
Chromium
DNA Bacterial Environmental Engineering Health Toxicology and Mutagenesis chemistry.chemical_element Sequencing batch reactor 02 engineering and technology 010501 environmental sciences Wastewater 01 natural sciences chemistry.chemical_compound Bioreactors RNA Ribosomal 16S Bioreactor Environmental Chemistry Ammonium Anaerobiosis Lactic Acid Hexavalent chromium Waste Management and Disposal 0105 earth and related environmental sciences Waste management Sewage Solid Phase Extraction 021001 nanoscience & nanotechnology Pollution Lactic acid Biodegradation Environmental chemistry Lactobacillaceae Bentonite Adsorption 0210 nano-technology Glycolysis Oxidation-Reduction Water Pollutants Chemical Mesophile Nuclear chemistry |
| Zdroj: | Journal of hazardous materials. 336 |
| ISSN: | 1873-3336 |
| Popis: | Α novel two-phase bioreactor for the microbial removal of Cr(VI) from wastewater with high chromium concentration (up to 1350 ppm) is developed. Among several potential solid-phase adsorbents tested, Cloisite® 30B, a natural montmorillonite modified with a quaternary ammonium salt that absorbs Cr(VI) in a reversible manner proved to be optimal as the solid phase of the bioreactor. Cloisite® 30B has no toxicity to the acclimated biomass and keeps the concentration of Cr(VI) ions at sub-inhibitory levels that ensure the efficient microbial removal of Cr(VI). The microbial removal of Cr(VI) was achieved using an acclimated mixed culture developed from anaerobic sludge. The novel bioreactor was operated as a Sequencing Batch Reactor (SBR) under anaerobic and mesophilic conditions for over 200 cycles, without further addition of the solid adsorbent, and led to even 100% removal of Cr(VI) with high removal rates for concentrations ranging from 900–1350 mg/L Cr(VI). The reduction of Cr(VI) to the less toxic Cr(III) was proved to be mediated by lactate, generated by a lactic acid bacterium, 99% similar to Pediococcus acidilactici as demonstrated by molecular methods The reduction of Cr(VI) took place extracellularly where it reacts with the lactic acid produced during the process of glycolysis. |
| Databáze: | OpenAIRE |
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