Efficient treatment of diazodinitrophenol industrial wastewater by a sequential zero-valent aluminum reduction- persulfate oxidation process

doi:10.19965/j.cnki.iwt.2023-0286

Abstract

Abstract:

Diazodinitrophenol (DDNP) is a widely used and powerful initiating explosive, and the production of a unit mass of DDNP generates 200-300 times more industrial wastewater containing DDNP and its derivatives. DDNP is highly toxic, stable and resists biodegradation. Furthermore, due to a strong electron-absorbing nitro group in its structure, DDNP has antioxidant property that makes it difficult to degrade completely even by single advanced oxidation technique. A sequential reduction-oxidation process was developed using modified zero-valent aluminum (C@mZVAl) and sodium persulfate (Na₂S₂O₈) and the degradation performance of the combined system on DDNP was investigated. The results revealed that the combination of C@mZVAl reduction and Na₂S₂O₈ oxidation could effectively treat industrial DDNP wastewater with DDNP of (1 050±15) mg/L without additional pretreatments such as dilution or pH adjustment, and the effect of treatment was significantly better than that of oxidation or reduction processes alone. The reduction stage reaction rate could be sped up by adding more C@mZVAl, and the elimination rate of DDNP and COD could be further enhanced by adding more Na₂S₂O₈. When the initial mass concentration of DDNP was (1 050±15) mg/L, 8 g/L C@mZVAl in the reduction stage combined with 10 mmol/L Na₂S₂O₈ in the oxidation stage for the reaction could lead to DDNP degradation rate of up to 96.81% and COD removal rate of up to 81.20% with a clear efflent. Compared with other current DDNP treatment processes, the modified zero-valent aluminum (C@mZVAl) combined with sodium persulfate (Na₂S₂O₈) process has the advantages of high efficiency, simple operation, and low consumption of chemicals, which provides a new idea for the treatment of DDNP and other types of antioxidant-organic industrial wastewater.

Key words: diazodinitrophenol industrial wastewater, antioxidative organic contaminants, zero-valent aluminum, sodium persulfate

摘要：

二硝基重氮酚（DDNP）是一种应用广泛的高效引发炸药，生产单位质量的DDNP便会产生200~300倍的含DDNP及其衍生物的工业废水。DDNP毒性大且十分稳定，难以生物降解，而且由于其结构中存在强吸电子的硝基结构，具有抗氧化性，单一高级氧化技术也难以将其彻底降解。利用改性微米零价铝（C@mZVAl）联合过硫酸钠（Na₂S₂O₈）构建先还原后氧化体系，考察耦合体系对DDNP的降解性能。结果表明，无需进行额外稀释或调pH等预处理，C@mZVAl联合Na₂S₂O₈便可实现对实际DDNP工业废水〔DDNP（1 050±15） mg/L〕的高效处理，处理效果明显优于单独的氧化或还原处理体系。增加C@mZVAl的投加量可以加快还原阶段的反应速率，增加Na₂S₂O₈的投加量可进一步提高DDNP和COD的去除率，当DDNP初始质量浓度为（1 050±15） mg/L时，还原阶段投加8 g/L C@mZVAl联合氧化阶段投加10 mmol/L Na₂S₂O₈进行反应，废水中DDNP降解率达96.81%，COD去除率达81.20%，出水清澈。相较于目前其他的DDNP处理工艺，改性微米零价铝（C@mZVAl）联合过硫酸钠（Na₂S₂O₈）工艺具有效率高、操作简单、药剂消耗少等特点，为DDNP及其他类型抗氧化有机工业废水的治理提供新的思路。

关键词: 二硝基重氮酚工业废水, 抗氧化有机污染物, 零价铝, 过硫酸钠

CLC Number:

TQ426
X703

Zhen YANG, Yang LI, Shiying YANG. Efficient treatment of diazodinitrophenol industrial wastewater by a sequential zero-valent aluminum reduction- persulfate oxidation process[J]. Industrial Water Treatment, 2024, 44(4): 98-104.

杨震, 李阳, 杨世迎. 零价铝还原联合过硫酸盐氧化高效处理DDNP工业废水[J]. 工业水处理, 2024, 44(4): 98-104.

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https://www.iwt.cn/EN/Y2024/V44/I4/98

Figures/Tables 7

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处理方法	技术特点	废水特性	反应条件	处理效率	参考文献
Fe/Cu-O₃	需通入O₃使置换法制备的Fe/Cu颗粒完全流化	COD 1 079 mg/L 色度 12 000度	Fe/Cu双金属材料 20 g/L、pH=5、O₃ 0.3 L/min	COD去除率85.30%、色度去除率95.00%	〔20〕
mFe⁰/PS/O₃	需在投加Fe⁰和PS的同时使O₃自下向上流动	COD 3 550 mg/L、B/C 0.06	pH=5.4、Fe⁰ 10 g/L、PS 15 mmol/L、O₃ 0.8 L/min	COD去除率70.30%、B/C 0.59	〔21〕
MW/Fe⁰/PS	需调整初始pH并将反应体系置于微波反应器中	COD 603.33 mg/L、TOC 344 mg/L、B/C 0.058	PS 6 g/L、Fe⁰ 0.4 g/L、MW功率450 W、初始pH=3	COD去除率69.52%、TOC去除率57.27%、B/C 0.45	〔22〕
C@mZVAl/ Na₂S₂O₈	无需稀释或调pH等预处理及额外反应发生装置	COD 1 210 mg/L	初始pH=4.95、C@mZVAl 8 g/L、 Na₂S₂O₈ 10 mmol/L	COD去除率81.20%、DDNP去除率96.81%	本研究

处理方法	技术特点	废水特性	反应条件	处理效率	参考文献
Fe/Cu-O₃	需通入O₃使置换法制备的Fe/Cu颗粒完全流化	COD 1 079 mg/L 色度 12 000度	Fe/Cu双金属材料 20 g/L、pH=5、O₃ 0.3 L/min	COD去除率85.30%、色度去除率95.00%	〔20〕
mFe⁰/PS/O₃	需在投加Fe⁰和PS的同时使O₃自下向上流动	COD 3 550 mg/L、B/C 0.06	pH=5.4、Fe⁰ 10 g/L、PS 15 mmol/L、O₃ 0.8 L/min	COD去除率70.30%、B/C 0.59	〔21〕
MW/Fe⁰/PS	需调整初始pH并将反应体系置于微波反应器中	COD 603.33 mg/L、TOC 344 mg/L、B/C 0.058	PS 6 g/L、Fe⁰ 0.4 g/L、MW功率450 W、初始pH=3	COD去除率69.52%、TOC去除率57.27%、B/C 0.45	〔22〕
C@mZVAl/ Na₂S₂O₈	无需稀释或调pH等预处理及额外反应发生装置	COD 1 210 mg/L	初始pH=4.95、C@mZVAl 8 g/L、 Na₂S₂O₈ 10 mmol/L	COD去除率81.20%、DDNP去除率96.81%	本研究

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