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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Removal of Cr from tannery sludge by indigenous sulfur-oxidizing bacteria
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Removal of Cr from tannery sludge by indigenous sulfur-oxidizing bacteria

机译：原生硫氧化细菌从制革污泥中去除Cr

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摘要

The aim of the present study was to examine Cr removal from tannery sludge by bioleaching method using indigenous sulfur-oxidizing bacteria with special emphasis on the influence of bioleaching process on sludge settleability. Chemical leaching with sulfuric acid was designed as the control. The results showed that the inoculation of sulfur-oxidizing bacteria and the addition of elemental sulfur were effective in removing Cr from tannery sludge. After 144 hours of bioleaching, 98% of Cr could be leached. Although it took only 8 hours to reduce the sludge pH from 7.8 to about 2.0 by chemical leaching as compared to 144 hours for bioleaching treatment, chemical leaching removed only 91% of the total Cr. Regardless of bioleaching and chemical leaching treatments, sludge settleability improved considerably with a decrease in sludge pH. Bioleaching treatment performed better than chemical leaching in terms of the percentage of settled sludge and the effluent suspended solids (ESS) content in sludge supernatant. Nevertheless, further work should be carried out to investigate the precise mechanisms leading to such enhanced sludge settleability during sludge bioleaching process.
机译：本研究的目的是研究使用本地硫氧化细菌通过生物浸出法从制革污泥中去除Cr的方法，并特别强调生物浸出过程对污泥沉降性的影响。设计了用硫酸的化学浸出作为对照。结果表明，接种硫氧化细菌和添加元素硫可有效去除制革污泥中的Cr。经过144小时的生物浸出后，可以浸出98％的Cr。尽管与化学浸提相比，通过化学浸提将污泥的pH从7.8降低到约2.0只需8小时，但化学浸提仅去除了总Cr的91％。无论采用生物浸出和化学浸出处理，污泥的可沉降性都随着污泥pH值的降低而大大提高。就沉淀污泥的百分比和污泥上清液中的污水悬浮固体（ESS）含量而言，生物沥滤处理的效果优于化学沥滤。然而，应该进一步开展工作，以研究导致污泥生物浸出过程中这种污泥沉降性增强的精确机制。

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