Efficient removal of hazardous benzohydroxamic acid (BHA) contaminants from the industrial beneficiation wastewaters by facile precipitation flotation process
Efficient removal of hazardous benzohydroxamic acid (BHA) contaminants from the industrial beneficiation wastewaters by facile precipitation flotation process
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通过简易沉淀浮选工艺有效去除工业选矿废水中的有害苯并异羟肟酸 (BHA) 污染物
DOI：
10.1016/j.seppur.2021.119718
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Liu Bingbing
中科院分区：
文献类型：
--
作者：
Han Guihong;Du Yifan;Huang Yanfang;Yang Shuzhen;Wang Wenjuan;Su Shengpeng;Liu Bingbing
苯并异羟肟酸（BHA）是选矿工业中广泛使用的捕收剂，含有大量BHA有机污染物的选矿废水亟待处理。本工作研究了螯合、絮凝、沉淀浮选工艺对各种工业废水中BHA有机污染物的有效去除。通过光学显微镜、SEM、FTIR、XPS、Zeta电位和热力学分析，研究了复合材料对净化水中BHA、COD和浊度的去除效果及螯合机理。结果表明，在弱碱性条件下，有机BHA污染物可首先与Cu（II）发生“O-O”螯合反应，形成疏水性的BHA-Cu沉淀，并形成五元螯合环。然后在微泡浮选柱中使用CTAB作为表面活性剂和NP-40作为起泡剂成功地去除所产生的沉淀。在最佳螯合、絮凝和浮选条件下，Cu（II）浓度30 mg/L，pH 8，螯合30 min，CTAB浓度0.2 mg/L，絮凝20 min，NP-40起泡剂浓度0.6 mg /L，空气流量100 mL/min，浮选40 min，BHA去除率可达94%以上。在此条件下，COD去除率为83.91%，净化后出水COD和浊度分别小于25 mg/L和0.1NTU，达到了污水排放要求。结果表明，沉淀浮选法是处理含BHA工业废水的一种有效方法。此外，还对不同pH值下Cu（II）与BHA的相互作用机理进行了探讨。
Benzohydroxamic acid (BHA) is intensively used as collector in the mineral processing industry, and thus tremendous hazardous beneficiation wastewater containing BHA organic contaminant needs urgent treatment. In this work, an efficient removal of BHA organic contaminants from various industrial beneficiation wastewaters via the chelation, flocculation, and precipitation flotation process was studied. The removal efficiency of BHA, COD and turbidity of the purified water, and the chelation mechanism were investigated by optical microscope, SEM, FTIR, XPS, Zeta potential, and thermodynamic analyses. The results showed that organic BHA contaminant can be chelated firstly by Cu(II) to form hydrophobic BHA-Cu precipitate effectively via the “O-O” chelation and a five-membered chelation ring was formed under weak alkaline conditions. The generated precipitate was then successfully removed using CTAB as surfactant and NP-40 as frother in a microbubble flotation column. Over 94% BHA was removed under the optimal chelation, flocculation and flotation conditions: chelation with Cu(II) concentration of 30 mg/L and pH of 8 for 30 min; flocculation with CTAB concentration of 0.2 mg/L for 20 min; followed by flotation with NP-40 frother of 0.6 mg /L and air flow rate of 100 mL/min for over 40 min. Under this condition, 83.91% COD was removed, and the residuel COD and turbidity of the purified water were lower than 25 mg/L and 0.1 NTU, respectively, which met the wastewater discharge requirement. It’s demonstrated that the precipitate flotation can be employed as an effective method to purify industrial wastewater containing BHA. In addition, the interaction mechanism of Cu(II) and BHA under different pH values was also discussed in this work.
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