Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
J Environ Manage. 2021 Feb 1;279:111558. doi: 10.1016/j.jenvman.2020.111558. Epub 2020 Nov 19.
In recent years, overexploited industrialization and urbanization activities have led to significant amounts of heavy metals released into the environment. Metal ion contamination of water, especially with toxic metals such as nickel(II) [Ni(II)], which is extensively applied in the electroplating industry, has been a serious problem. The aim of the present study was to evaluate the Ni(II) removal from real industrial wastewater using a 2 L, lab-scale, up-flow, anaerobic, zeolite-packed bioreactor inoculated with a heterotrophic consortium as the bioadsorbent. High-throughput sequencing of 16S rRNA genes revealed significant shifts in their bacterial diversity and structural composition along the bioreactor treatment location, where the bacterial genus was dominated by Kosmotogae followed by Firmicutes as Ruminococcus and Clostridium. However, Fervidobacterium and the Geobacter genus were absent at the end of the bioreactor treatment, suggesting that they play a key role in the beginning of Ni(II) removal anaerobic treatment. The physico-chemical results revealed that the Ni(II) removal rate was 99% for 250-500 ppm metal tested, with an efficient alkalinity rate and high production of biogas, which confirmed that anaerobic digestion of microorganisms was successfully performed through the process. Finally, this anaerobic bioreactor configuration offers an accessible and ecofriendly high-rate metal removal strategy from mining and electroplating effluents.
近年来，过度开采的工业化和城市化活动导致大量重金属释放到环境中。水的金属离子污染，特别是有毒金属如镍（II）[Ni（II）]的污染，已经成为一个严重的问题。本研究旨在评估使用 2L 实验室规模上流式厌氧沸石填充生物反应器，接种异养菌作为生物吸附剂，从实际工业废水中去除 Ni（II）。16S rRNA 基因高通量测序结果显示，其细菌多样性和结构组成沿着生物反应器处理位置发生了显著变化，细菌属以 Kosmotogae 为主，其次是 Ruminococcus 和 Clostridium 的 Firmicutes。然而，Fervidobacterium 和 Geobacter 属在生物反应器处理结束时不存在，这表明它们在 Ni（II）去除厌氧处理的开始阶段发挥了关键作用。理化结果表明，对于测试的 250-500ppm 金属，Ni（II）的去除率为 99%，碱度效率高，沼气产量高，这证实了微生物的厌氧消化过程是成功进行的。最后，这种厌氧生物反应器结构为从采矿和电镀废水中去除金属提供了一种易于获得且环保的高效策略。
