pH 值对聚铝(PAC)污泥中磷(P)溶解和回收的影响。
Effect of pH on phosphorus (P) dissolution and recovery from polyaluminum chlorides (PAC) sludge.
机构信息
Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon, Gangwon 24252, South Korea.
Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon, Gangwon 24252, South Korea.
出版信息
J Environ Manage. 2019 Jun 1;239:142-149. doi: 10.1016/j.jenvman.2019.03.049. Epub 2019 Mar 18.
Phosphorus (P) dissolution from polyaluminum chlorides (PAC) sludge was investigated for sustainable P recovery. P dissolution followed 1st order kinetics with the rate constants of 3.8 × 10, 0.8 × 10, 1.3 × 10 and 1.9 × 10 min at pH 1, 2.5, 10.5 and 12, respectively. Strong acidic and alkaline conditions dissolved about 82 (pH 1) and 88% (pH 12) of the total P by adding 0.214 g HCl and 0.357 g NaOH per gram P dissolved, respectively. Chemical P fractionation showed that more than 96% of the total P of the PAC sludge was AlP and it was reduced to 11.3 (pH 12) and 12.6% (pH 1.0) after the acid and alkali treatment. ATR-FTIR showed that AlPO in the PAC sludge was transformed to Mg(PO)∙4HO and CaHPO∙2HO after alkali treatment and HPO and Na/MgP after acid treatment. Dissolved P can be recovered by precipitation with Ca and Mg.
研究了聚合氯化铝（PAC）污泥中磷的溶解，以实现可持续的磷回收。磷的溶解遵循一级动力学，在 pH 值为 1、2.5、10.5 和 12 时，速率常数分别为 3.8×10、0.8×10、1.3×10 和 1.9×10 min。在 pH 值为 1 时，通过添加 0.214 g HCl 可溶解约 82%（总磷的 82%）的磷，在 pH 值为 12 时，通过添加 0.357 g NaOH 可溶解约 88%的磷。化学磷形态分析表明，PAC 污泥中超过 96%的总磷为 AlP，经酸、碱处理后分别降至 11.3%（pH 值 12）和 12.6%（pH 值 1.0）。ATR-FTIR 表明，PAC 污泥中的 AlPO 在碱处理后转化为 Mg(PO)∙4HO 和 CaHPO∙2HO，在酸处理后转化为 HPO 和 Na/MgP。溶解的磷可以通过与钙和镁沉淀回收。
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