亚铁离子对生物浸出过程中胞外聚合物含量和污泥脱水性能的影响。
Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching.
机构信息
Sino Forest Applied Research Center for Pearl River Delta Environment & Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region.
Sino Forest Applied Research Center for Pearl River Delta Environment & Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region; College of Resources and Environment, Nanjing Agricultural University, Nanjing, PR China.
出版信息
Bioresour Technol. 2015 Mar;179:78-83. doi: 10.1016/j.biortech.2014.10.099. Epub 2014 Oct 25.
Pretreatment of activated sludge with sulfuric acid and bioleaching using Acidithiobacillus ferrooxidans along with addition of Fe(2+) on sludge dewaterability was investigated. The sludge dewatering efficiency in terms of capillary suction time (CST) and specific resistant to filtration (SRF) was increased with a decrease in sludge pH. A pH of 2.67 was found to be optimum for dewatering, at which 81% and 63% reduction of CST and SRF were achieved, respectively. The dewaterability of sludge was enhanced after the addition of Fe(2+) and A. ferrooxidans. Ideal concentration of Fe(2+) was 2 g/L for sludge dewaterability, which showed 96% and 88% reduction in CST and SRF, respectively. In the control sludge, maximum part of the biopolymeric macromolecules was contributing by the tightly bound extracellular polymeric substances (TB-EPS). At optimum Fe(2+) concentration, total EPS was reduced by 73%, enhancing sludge dewaterability. Bioleaching conducted by A. ferrooxidans could solubilized 88% Cu and 99% Zn within 120 h.
研究了用硫酸预处理活性污泥，并用嗜酸氧化亚铁硫杆菌进行生物浸出，并添加 Fe(2+) 对污泥脱水性能的影响。污泥脱水效率用毛细吸水时间 (CST) 和比阻力过滤 (SRF) 来表示，随着污泥 pH 值的降低而增加。发现 pH 值为 2.67 时最有利于脱水，此时 CST 和 SRF 分别降低了 81%和 63%。添加 Fe(2+) 和嗜酸氧化亚铁硫杆菌后，污泥的脱水性能得到了提高。对于污泥脱水，Fe(2+) 的理想浓度为 2 g/L，此时 CST 和 SRF 分别降低了 96%和 88%。在对照污泥中，生物聚合物大分子的大部分是由紧密结合的胞外聚合物物质 (TB-EPS) 组成的。在最佳的 Fe(2+)浓度下，总 EPS 减少了 73%，从而提高了污泥的脱水性能。嗜酸氧化亚铁硫杆菌在 120 小时内可溶解 88%的 Cu 和 99%的 Zn。
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