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In Situ Stimulation of Thiocyanate Biodegradation through Phosphate Amendment in Gold Mine Tailings Water
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acs.est.7b04152 Mathew P. Watts 1 , Han M. Gan 2, 3, 4 , Lee Y. Peng 3, 4 , Kim-Anh Lê Cao 5 , John W. Moreau 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acs.est.7b04152 Mathew P. Watts 1 , Han M. Gan 2, 3, 4 , Lee Y. Peng 3, 4 , Kim-Anh Lê Cao 5 , John W. Moreau 1
Affiliation
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Thiocyanate (SCN–) is a contaminant requiring remediation in gold mine tailings and wastewaters globally. Seepage of SCN–-contaminated waters into aquifers can occur from unlined or structurally compromised mine tailings storage facilities. A wide variety of microorganisms are known to be capable of biodegrading SCN–; however, little is known regarding the potential of native microbes for in situ SCN– biodegradation, a remediation option that is less costly than engineered approaches. Here we experimentally characterize the principal biogeochemical barrier to SCN– biodegradation for an autotrophic microbial consortium enriched from mine tailings, to arrive at an environmentally realistic assessment of in situ SCN– biodegradation potential. Upon amendment with phosphate, the consortium completely degraded up to ∼10 mM SCN– to ammonium and sulfate, with some evidence of nitrification of the ammonium to nitrate. Although similarly enriched in known SCN–-degrading strains of thiobacilli, this consortium differed in its source (mine tailings) and metabolism (autotrophy) from those of previous studies. Our results provide a proof of concept that phosphate limitation may be the principal barrier to in situ SCN– biodegradation in mine tailing waters and also yield new insights into the microbial ecology of in situ SCN– bioremediation involving autotrophic sulfur-oxidizing bacteria.
中文翻译：
通过磷酸修正金矿尾矿中水对硫氰酸盐生物降解的原位刺激
硫氰酸盐（SCN –）是一种污染物，需要在全球范围内对金矿尾矿和废水进行修复。SCN的渗流- -contaminated水域进入含水层可以从单衣或结构损害的尾矿储存设施发生。已知各种各样的微生物都可以生物降解SCN –。但是，对于原生微生物在原位SCN方面的潜力知之甚少-生物降解，这种修复方法的成本低于工程方法。在这里，我们通过实验表征了SCN的主要生物地球化学障碍–从矿山尾矿中富集的自养微生物财团进行生物降解，从而对原位SCN –生物降解潜力进行环境现实的评估。经磷酸盐改性后，该财团可完全降解至约10 mM SCN –分解为铵和硫酸盐，并有一些将铵硝化为硝酸盐的证据。尽管在已知的类似SCN富集- -degrading的硫杆菌菌株，该财团在从那些先前研究的其源极（尾矿）和代谢（自养）不同。我们的结果提供了一种概念证明，即磷酸盐限制可能是原位SCN的主要障碍-在矿山尾矿水中进行生物降解，也对原位SCN的微生物生态学产生了新的见解-涉及自养硫氧化细菌的生物修复。
更新日期：2017-11-08
中文翻译：
通过磷酸修正金矿尾矿中水对硫氰酸盐生物降解的原位刺激
硫氰酸盐（SCN –）是一种污染物，需要在全球范围内对金矿尾矿和废水进行修复。SCN的渗流- -contaminated水域进入含水层可以从单衣或结构损害的尾矿储存设施发生。已知各种各样的微生物都可以生物降解SCN –。但是，对于原生微生物在原位SCN方面的潜力知之甚少-生物降解，这种修复方法的成本低于工程方法。在这里，我们通过实验表征了SCN的主要生物地球化学障碍–从矿山尾矿中富集的自养微生物财团进行生物降解，从而对原位SCN –生物降解潜力进行环境现实的评估。经磷酸盐改性后，该财团可完全降解至约10 mM SCN –分解为铵和硫酸盐，并有一些将铵硝化为硝酸盐的证据。尽管在已知的类似SCN富集- -degrading的硫杆菌菌株，该财团在从那些先前研究的其源极（尾矿）和代谢（自养）不同。我们的结果提供了一种概念证明，即磷酸盐限制可能是原位SCN的主要障碍-在矿山尾矿水中进行生物降解，也对原位SCN的微生物生态学产生了新的见解-涉及自养硫氧化细菌的生物修复。
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