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首页> 外文会议>The 23rd International Conference on Solid Waste Technology and Management(ICSW 2008) >Bioleaching of Heavy Metals from Aerobic and Anaerobic Sewage Sludges
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Bioleaching of Heavy Metals from Aerobic and Anaerobic Sewage Sludges

机译：从好氧和厌氧污泥中重金属的生物浸出

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摘要

The removal of heavy metals from sewage sludge is an important aspect of sludge management. The potential application of microorganisms in leaching of metals from the sludge is gaining importance in recent years. In the present study, bioleaching of heavy metals from aerobic and anaerobic sewage sludges was examined using indigenous iron and sulfur oxidizing microorganisms. Batch experiments were carried out with each sludge in 250 ml Erlenmeyer flask. After 16 days of bioleaching using 10-50 g L~(-1) ferrous sulfate, iron oxidizing microorganisms resulted in the maximum solubilization of 78% Cu, 79% Ni, 87% Zn and 47% Cr from aerobic sludge and 60% Cu, 67% Ni, 77% Zn and 32% Cr from anaerobic sludge. On the other hand, using 10-50 g L~(-1) elemental sulfur, sulfur oxidizing microorganisms resulted in significantly higher metal solubilization of 97% Cu, 93% Ni, 96% Zn and 68% Cr from aerobic sludge and 90% Cu, 90% Ni, 92% Zn and 52% Cr from anaerobic sludge. The results of the present study strongly indicate that sulfur-oxidizing microorganisms were comparatively more efficient in bioleaching of heavy metals from both aerobic and anaerobic sludges.
机译：从污水污泥中去除重金属是污泥管理的重要方面。近年来，微生物在从污泥中浸出金属的潜在应用正变得越来越重要。在本研究中，使用本地的铁和硫氧化微生物检查了好氧和厌氧污泥中重金属的生物浸出。在250 ml锥形瓶中对每种污泥进行批处理实验。在使用10-50 g L〜（-1）硫酸亚铁进行生物浸出16天后，氧化铁的微生物从好氧污泥和60％铜中最大溶解度为78％Cu，79％Ni，87％Zn和47％Cr ，厌氧污泥中的67％Ni，77％Zn和32％Cr。另一方面，使用10-50 g L〜（-1）元素硫，硫氧化微生物可显着提高来自好氧污泥和97％铜的97％Cu，93％Ni，96％Zn和68％Cr的金属溶解度。来自厌氧污泥的Cu，90％Ni，92％Zn和52％Cr。本研究的结果有力地表明，硫氧化微生物在需氧污泥和厌氧污泥中重金属的生物浸出方面相对更有效。

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