Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, University of Sfax, PO Box 1177, 3018 Sfax, Tunisia.
Center for Sustainable Development, College of Arts and Sciences, Qatar University, Doha 2713, Qatar.
Biomed Res Int. 2019 Jun 3;2019:9020178. doi: 10.1155/2019/9020178. eCollection 2019.
The ability of strain to reduce organic and mineral pollution as well as the toxicity of two tannery wastewaters, the unhairing effluent (UE) and the final effluent (FE), taken from a local Tunisian tannery and under nonsterile conditions, was studied. Raw effluents show alkaline pH ≥11; thus experiments were carried out at initial pH values and at pH adjusted to 6. Characterization of effluents also revealed high salt levels (EC > 17 mS/cm) and high organic matter content (25 g/L for the UE and 7.2 g/L for the FE) but a low biodegradability since BOD did not exceed 2.5 and 1.25 g/L for the UE and the FE, respectively. The results of the biological treatment showed that was able not only to grow at high pH and salinity values, but also to reduce organic and mineral pollutant load. After treatment, the COD reduction for the UE reached 90% and 70% at pH=6 and at initial pH (12.13), respectively. For the FE, the decrease of COD values reached 75% at pH=6 and 64% at initial pH (11.64). Monitoring of mineral pollution levels showed a reduction in chromium (Cr) concentrations reaching 70% for the FE. This was reflected by an increase of the biomass of from 9.25 g/L (control) to 9.84 g/L for the FE. To confirm the efficiency of the biological treatment using phytotoxicity (tomato seeds) and microtoxicity ( and tests were carried out. Results of this monitoring showed an important decrease in the toxicity levels for both effluents.
研究了一株菌在非无菌条件下降低两种制革废水（脱毛废水（UE）和终期废水（FE））的有机和无机污染及毒性的能力，这两种废水均来自于突尼斯当地的一家制革厂。原废水呈碱性 pH 值≥11；因此，实验在初始 pH 值和调整至 6 的 pH 值下进行。废水的特性分析表明，盐度（EC＞17 mS/cm）和有机物含量（UE 为 25 g/L，FE 为 7.2 g/L）都很高，但生物降解性很低，因为 UE 和 FE 的 BOD 分别不超过 2.5 和 1.25 g/L。生物处理的结果表明，不仅能够在高 pH 值和盐度值下生长，还能降低有机和无机污染物的负荷。处理后，UE 的 COD 去除率在 pH=6 和初始 pH 值（12.13）下分别达到 90%和 70%。对于 FE，COD 值的下降在 pH=6 时达到 75%，在初始 pH 值（11.64）下达到 64%。监测矿物污染水平表明，FE 的铬（Cr）浓度降低了 70%。这反映了 的生物量从 9.25 g/L（对照）增加到 9.84 g/L。为了确认使用 进行生物处理的效率，进行了（番茄种子）的生物毒性和（发光细菌和水蚤）的微毒性测试。监测结果表明，两种废水的毒性水平都有显著下降。
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