Recovery of ammonium and phosphate using battery deionization in a background electrolyte,Environmental Science: Water Research & Technology

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Recovery of ammonium and phosphate using battery deionization in a background electrolyte
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-04-28 , DOI: 10.1039/d0ew00183j
Moon Son _{1,

2,

3} , Benjamin L. Aronson _{1,

2,

3} , Wulin Yang _{1,

2,

3} , Christopher A. Gorski _{1,

2,

3} , Bruce E. Logan _{1,

2,

3}

Affiliation

Ammonium ions can be effectively removed from water using electrochemical processes such as battery electrode deionization (BDI), but previous tests have examined removal in the presence of competing ions (e.g. sodium). The recovery of NH₄⁺ was examined here in the absence and presence of a relatively inert background electrolyte (MgCl₂, 10 mM) added to only provide a conductive solution with cations that have minimal intercalation into the copper hexacyanoferrate (CuHCF) electrodes. The capacity of the CuHCF electrodes for NH₄⁺ in the presence of MgCl₂ was nearly constant at 8.4 ± 1.4 g-NH₄⁺/g-electrode (treated stream, 0.3 V) over a range of 10 to 100 mM NH₄Cl. In addition, the energy needed to remove NH₄⁺ was constant at <2.4 kW h per kg-N. The impact of Cl⁻ on removal of phosphate ions was also examined, with ∼2 : 1 removal of Cl⁻ to phosphate ions (Cl : P) at ratios of up to 4 : 1. Even at very high ratios of >11.5, at least 20% of the anions removed were phosphate ions compared to Cl⁻. These results demonstrate that the capacity of the BDI electrodes is relatively independent of the NH₄⁺ concentration, and that phosphate is not selectively removed compared to Cl⁻.

中文翻译：

在背景电解液中使用电池去离子回收铵和磷酸盐

可以使用电化学过程（例如电池电极去离子（BDI））从水中有效去除铵离子，但是先前的测试已经检查了存在竞争离子（例如钠）的情况下的去除效果。NH的恢复₄⁺在这里检查在相对惰性的背景电解质的不存在和存在（的MgCl ₂加入到只提供与具有最小的插入铁氰化铜（CuHCF的）电极阳离子的导电溶液，10毫摩尔）。在MgCl ₂存在下，CuHCF电极对NH ₄⁺的容量几乎恒定在8.4±1.4 g-NH ₄⁺/ g电极（处理后的气流，0.3 V）在10至100 mM NH ₄ Cl的范围内。此外，去除NH ₄⁺所需的能量恒定为<2.4 kWh / kg-N。氯的影响^-上除去磷酸根离子的也做了检查，用〜2：1移除的Cl ^-以磷酸根离子（CL：P）在高达的比率为4：1。即使在> 11.5比率非常高，在相比氯除去阴离子的至少20％是磷酸根离子^-。这些结果表明，在电极BDI的容量是相对独立于NH的₄⁺浓度，以及磷酸盐不选择性地去除相比氯^-。

更新日期：2020-04-28

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