Effects of fluoride-containing effluents on methane production and biodegradation of anaerobic granular sludge
Fluoride is major raw material of chemical industry and is also the main pernicious composition in industrial wastewater, which leads to serious environmental pollution. Anaerobic biological treatment technology is a kind of low cost wastewater treatment technology which combines wastewater treatmen...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2012-11-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2011.11.281 |
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| Summary: | Fluoride is major raw material of chemical industry and is also the main pernicious composition in industrial wastewater, which leads to serious environmental pollution. Anaerobic biological treatment technology is a kind of low cost wastewater treatment technology which combines wastewater treatment with energy recovery. The prospects for the anaerobic wastewater treatment are extremely promising. However, the bioactivity of anaerobic microorganism, especially the methanogens can be hampered seriously by toxic and harmful substances, such as nitrophenol positional isomers, PCP (pentachlorophenol), polycyclic aromatic hydrocarbon, fluoride-containing effluents, etc. Furthermore, the vailable information about the effects of fluoride-containing effluents on the methane production and biodegradation process of anaerobic microbe in biological wastewater treatment is very limited at present. The purpose of this study is to evaluate the inhibitory effect of fluoride against the main microbial populations expressing in the methanogenic activity and the recovery of the biological activity.To attain this goal, a short-term batch anaerobic toxicity test (ATA) was conducted. The batch test was consisted of five parts, namely, the first, the second and the third anaerobic toxicity assay, as well as the first and the second anaerobic resuming assay, respectively.The results indicated that the inhibitory effects of the low fluoride concentration of 25 mg/L against the activity of methanogenic bacteria were a bit slight. The inhibitory impact was recorded severe when the concentration of fluoride rose from 25 mg/L to 100 mg/L, dropping the methane production from 96 mL to 64 mL. However, the effect was not very obvious at the range of fluoride concentrations from 100 mg/L to 400 mg/L; as a result, the methane production reduced from 64 mL to 60 mL (Fig. 1A). The inhibitory effects were enhanced during the subsequent addition of fluoride (Fig. 1B, C). The methanogenic activity recovery type was dependent on the dose of fluoride. The recovery type was metabolic at low fluoride concentration (≤ 25 mg/L), while it was physiological at high fluoride concentration (100-400 mg/L) (Fig. 2). The substrate biodegradation was decreased with an increase of fluoride concentration (Table 2, 3).Three main conclusions can be drawn from the results. First, the half inhibitory concentration (IC50) of methanogenic activity is 367.12 mg/L F<sup>-</sup>; second, the anaerobic resuming assay exhibits a considerable difference in the toxic effect of various fluoride concentrations on anaerobic granular sludge; third, the biodegradability of wastewater will be affected when the F<sup>-</sup> concentration increases to above 100 mg/L. |
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| ISSN: | 1008-9209 2097-5155 |