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首页> 外文期刊>Waste Management >Sequential electrodialytic recovery of phosphorus from low-temperature gasification ashes of chemically precipitated sewage sludge
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Sequential electrodialytic recovery of phosphorus from low-temperature gasification ashes of chemically precipitated sewage sludge

机译：从化学沉淀污水污泥的低温气化灰中依次电渗析回收磷

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摘要

Phosphorus recycling from secondary materials like sewage sludge ashes offers an alternative to mining of phosphates from primary resources and a mean to counteract the current phosphorous rock depletion concern. A separation of P from the bulk ash is normally required, due to its low plant availability and the presence of heavy metals. Previously, more than 80% of P was recovered from incineration sewage sludge ashes using a two-compartment electrodialytic cell. In contrast, the recovery was below 30% for ashes from low-temperature gasification using the same setup. The low recovery was due to a high presence of Al- and Fe(Ⅲ)-P bindings. In the present study, an electrodialytic process combining sequentially a pair of two-compartment cells allowed a recovery of up to 70% of phosphorus from these ashes. The use of a second cell, where the ash was suspended in an alkaline solution, allowed the P solubilisation from aluminium and ferric phosphates. In addition, P was separated from most metals as they became insoluble under the prevailing chemical environment. The obtained ratio of Al, Fe, Mg and most heavy metals to P was comparable to wet process phosphoric acid. Therefore, this sequential process was found to be suitable to recycle P and potentially use it in the production of common fertilizers like diammonium phosphate.
机译：从诸如污水污泥灰等次要材料中回收磷，是从主要资源中开采磷酸盐的另一种选择，并且可以抵消目前磷矿石枯竭的担忧。由于工厂利用率低且存在重金属，因此通常需要将P与散装灰分分离。以前，使用两室电渗析池从焚化污水污泥灰中回收了80％以上的P。相比之下，使用相同设置的低温气化灰烬的回收率低于30％。回收率低是由于大量存在Al-和Fe（Ⅲ）-P结合。在本研究中，电渗析工艺顺序地结合了一对两室电池，可从这些骨灰中回收高达70％的磷。使用第二个池中的灰分悬浮在碱性溶液中，可以从铝和磷酸铁中溶解P。此外，由于在当前的化学环境下它们变得不溶，因此将P与大多数金属分离。 Al，Fe，Mg和大多数重金属与P的比例与湿法磷酸相当。因此，发现该顺序过程适合回收磷，并有可能将其用于生产普通肥料（如磷酸氢二铵）。

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