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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >The removal of phosphorus from reject water in a municipal wastewater treatment plant using iron ore
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The removal of phosphorus from reject water in a municipal wastewater treatment plant using iron ore

机译：使用铁矿石从市政废水处理厂中去除废水中的磷

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BACKGROUND: Reject water (return liquor) from dewatering of anaerobically digested activated sludge in municipal wastewater treatment plants contains from 10 to 50% of the phosphorus load when being recycled to the aeration tank. Phosphorus removal from reject water could be an effective way to decrease phosphorus loads entering the aeration tank. An innovative approach involves the replacement of iron salts, which are commonly used for phosphorus removal, with ferrous ions produced by iron-reducing bacteria from iron ore. The aim of the research was to examine the feasibility of phosphorus removal from return liquor using bioreduction of iron ore. RESULTS: Ferrous production, phosphate and organic carbon removal rates were determined as a function of different iron ore particle sizes in batch experiments. Iron-reducing bacteria ensured the production of ferrous ions from iron ore up to concentrations of 550 mg L~(-1). The ferrous production rate was linearly dependent on the calculated specific surface area of the iron ore particles. The phosphorus concentration in the reject water was reduced by 90% during bioreduction of iron ore. The phosphorus removal rate did not depend on specific surface area of iron ore particles when the particle size of iron ore was smaller than 7 mm. The organic carbon removal rate did not seem to be dependent on iron ore particle size. CONCLUSION: Removal of phosphate using iron ore can be more economical than conventional chemical precipitation of phosphate using iron salts because of the lower cost of iron ore.
机译：背景：在市政废水处理厂中，厌氧消化的活性污泥脱水后产生的废水（回水）含有10％至5​​0％的磷负荷，然后再回收到曝气池中。从废水中去除磷可能是减少进入曝气池的磷负荷的有效方法。一种创新方法涉及用铁矿石中的还原铁细菌产生的亚铁离子代替通常用于除磷的铁盐。该研究的目的是检验使用铁矿石生物还原从回流液中去除磷的可行性。结果：在批处理实验中，确定了不同铁矿石颗粒大小的亚铁产量，磷酸盐和有机碳去除率。还原铁细菌可确保从铁矿石中生产浓度高达550 mg L〜（-1）的亚铁离子。铁的生产率线性地取决于计算出的铁矿石颗粒的比表面积。在铁矿石的生物还原过程中，废水中的磷浓度降低了90％。当铁矿石的粒径小于7mm时，除磷率不取决于铁矿石颗粒的比表面积。有机碳去除速率似乎并不取决于铁矿石的粒度。结论：由于铁矿石的成本较低，因此使用铁矿石去除磷酸盐可能比使用铁盐的常规化学沉淀法更经济。

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