Research on advanced oxidation treatment of coal chemical wastewater using microinterfaces

doi:10.11949/0438-1157.20240462

Abstract

Abstract:

The deep treatment of various organic pollutants contained in coal chemical wastewater and the improvement of its reuse rate have important ecological and economic significance. However, some pollutants have high concentrations and traditional wastewater biological treatment processes cannot completely remove them. Failing to meet increasingly stringent wastewater discharge standards. This article constructs a structure-activity regulation mathematical model for the advanced oxidation reaction system of coal chemical wastewater based on a microinterface enhanced reactor, clarifying the strengthening mechanism and efficiency of microinterface enhanced technology on ozone advanced oxidation. The results showed that under the same conditions, the bubble size decreased from 10.0 mm to 0.1 mm, and the COD removal rate of wastewater increased from 70.02% to 90.02%. At the same gas volume, when the COD removal rate reaches 70%, the microinterface reactor can increase the wastewater treatment capacity by 66.50% compared to the ordinary bubble reactor. Provide strong reference for the scaling up and design of advanced oxidation treatment of coal chemical wastewater at microinterfaces.

Key words: interfacial area, gas-liquid flow, transport processes, simulation, advanced oxidation

摘要：

深度处理煤化工废水含有的各种各样有机污染物，提高煤化工废水的回用率，具有重要的生态和经济意义。但有些污染物浓度很高，传统的废水生物处理工艺无法去除并且无法满足日益严格的废水排放标准。依据微界面强化反应器构建了煤化工污水微界面高级氧化反应体系的构效调控数学模型，明确了微界面强化技术对臭氧高级氧化的强化机制和强化效能。结果表明，相同条件下，气泡尺寸从10.0 mm减至0.1 mm，废水COD去除率从70.02%增至90.02%；相同的气量下，COD去除率达到70%时，微界面反应器较普通鼓泡反应器，其废水处理量可提高66.50%。为微界面高级氧化处理煤化工废水的放大和设计提供有力参考。

关键词: 相界面积, 气液两相流, 传递过程, 模拟, 高级氧化

CLC Number:

TQ 021.4

Yingyu XU, Guoqiang YANG, Jing PENG, Haining SUN, Zhibing ZHANG. Research on advanced oxidation treatment of coal chemical wastewater using microinterfaces[J]. CIESC Journal, 2024, 75(S1): 283-291.

徐英宇, 杨国强, 彭璟, 孙海宁, 张志炳. 微界面高级氧化处理煤化工废水的研究[J]. 化工学报, 2024, 75(S1): 283-291.

Figures/Tables 12

Table 1 Data on COD of wastewater over time under different temperature conditions

时间/min	COD/(mg/L)
时间/min	35℃	45℃
0	361.2	361.2
10	279.8	275.4
20	227.2	213.7
30	180.6	162.5
50	108.3	66.2
80	49.66	28.6

Fig.1 Experimental testing and fitting of COD over time curves under different temperature conditions

Table 2 Structural activity model parameters

参数	数值	备注
反应温度/℃	35
入口压力/MPa（A）	0.2
表观气速/(m/s)	0.012	工况入口
表观液速/(m/s)	0.0022
臭氧浓度/(g/m³)	147.8	氧气转化率取10%^①
进口COD/(g/m³)	361.2
有效液位高度/mm	8000

Fig.2 Comparison of bubble size at different conditions

Fig.3 The effect of bubble size on the gas-liquid interfacial area

Fig.4 The effect of bubble size on interface mass transfer resistance

Fig.5 The effect of bubble size on COD removal rate

Fig.6 Axial distribution of COD value and COD removal rate under different bubble sizes

Fig.7 The effect of superficial gas velocity on COD removal rate and O3 utilization rate under different bubble sizes

Fig.8 The effect of superficial liquid velocity on COD removal rate and O3 utilization rate under different bubble sizes

Fig.9 The effect of liquid level height on COD removal rate and O3 utilization rate

Fig.10 Comparison between theoretical models and experimental data

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