鸟粪石结晶法回收电镀废水中氮磷试验研究

doi:10.19965/j.cnki.iwt.2023-0301

摘要/Abstract

摘要：

采用鸟粪石结晶法回收电镀废水中的氮磷，主要考察了pH、重金属离子浓度、氟离子质量浓度对电镀废水中氮磷去除的影响，结果表明pH和重金属离子浓度可显著影响鸟粪石结晶过程，低质量浓度氟离子（0~40 mg/L）对鸟粪石结构的影响可以忽略。对不同条件下形成的鸟粪石进行了XRD、SEM、XPS表征，分析了重金属离子和氟离子对鸟粪石结晶过程的影响机理。重金属离子与鸟粪石可发生共沉淀，干扰鸟粪石结晶的形成。当氟离子与重金属离子共存时，氟离子会影响重金属离子在晶体上的吸附，并生成非晶相共沉淀物，改变鸟粪石的晶体形态。该研究为鸟粪石结晶法回收电镀废水中的氮磷提供理论依据。

关键词: 电镀废水, 重金属离子, 氟离子, 鸟粪石

Abstract:

The nitrogen and phosphorus in electroplating wastewater were recovered using struvite crystallization method. The effects of pH, concentration of heavy metal ions and mass concentration of fluoride ions on the removal of nitrogen and phosphorus in electroplating wastewater were investigated. The results showed that pH and concentration of heavy metal ions had significantly affect on the process of struvite crystallization, while the effect of low mass concentration（0-40 mg/L） of fluoride ions on the structure of struvite could be ignored. XRD, SEM and XPS characterization were conducted on struvite formed under different conditions, and the influence mechanism of heavy metal ions and fluorine ions on the crystallization process of struvite was analyzed. Heavy metal ions could co-precipitate with struvite and interfere with the formation of struvite crystals. When fluoride ions coexisted with heavy metal ions, fluoride ions would interfere the adsorption of heavy metal ions on the crystal, and generate amorphous phase coprecipitates, changing the crystal morphology of struvite. This study provides a theoretical basis for the recovery of nitrogen and phosphorus from electroplating wastewater by the struvite crystallization method.

Key words: electroplating wastewater, heavy metal ions, fluoride ions, struvite

中图分类号:

X703

孙采蕊, 欧阳铸, 曹露, 胡莹, 黄海明, 王炳乾, 龙柯桦, 陶乐瑶. 鸟粪石结晶法回收电镀废水中氮磷试验研究[J]. 工业水处理, 2024, 44(4): 113-119.

Cairui SUN, Zhu OUYANG, Lu CAO, Ying HU, Haiming HUANG, Bingqian WANG, Kehua LONG, Leyao TAO. Experimental study on the recovery of nitrogen and phosphorus from electroplating wastewater by struvite crystallization method[J]. Industrial Water Treatment, 2024, 44(4): 113-119.

https://www.iwt.cn/CN/Y2024/V44/I4/113

图/表 6

图1 pH对氮磷去除率的影响

Fig.1 Effect of pH on nitrogen and phosphorus removal rate

图2 重金属浓度对氮磷去除率的影响

Fig.2 Effect of heavy metal concentration on nitrogen and phosphorus removal rate

图3 氟离子对氮磷去除效果的影响

Fig.3 Effect of fluoride ions on nitrogen and phosphorus removal

图4 产物XRD

Fig.4 XRD of precipitates

图5 加入金属离子和金属离子与氟离子共存产物的SEM

Fig.5 SEM of precipitates containing metal ions and coexisting metal ions with fluoride ions

图6 产物的XPS

Fig.6 XPS of Sediments

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