含酚废水α-Fe<sub>2</sub>O<sub>3</sub>催化臭氧氧化参数优化及机理分析

王勇; 张耀宗; 毕莹莹; 杜明辉; 孙晓明

doi:10.12153/j.issn.1674-991X.20210355

含酚废水α-Fe₂O₃催化臭氧氧化参数优化及机理分析

doi: 10.12153/j.issn.1674-991X.20210355

王勇^{1, 2,},
张耀宗²,
毕莹莹¹,
杜明辉¹,
孙晓明^1, ,

1.
国家环境保护生态工业重点实验室, 中国环境科学研究院
2.
华北理工大学建筑与土木工程学院

基金项目: 国家水体污染控制与治理科技重大专项（2017ZX07402-002）

详细信息

作者简介:
王勇（1997—），男，硕士研究生，主要从事水污染控制与废水资源化研究，1833055310@qq.com

通讯作者:
孙晓明（1978—），男，研究员，博士，主要从事水污染控制与废水资源化研究，sunxm52@126.com

中图分类号: X703
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出版历程
- 收稿日期: 2021-07-16

Optimization and mechanism analysis of α-Fe₂O₃ catalytic ozone oxidation parameters for phenolic wastewater

1.
State Environmental Protection Key Laboratory of Ecological Industry, Chinese Research Academy of Environmental Sciences
2.
School of Architecture and Civil Engineering, North China University of Science and Technology

摘要

摘要:
传统工艺对含酚废水的处理效果有限，催化臭氧氧化技术能够有效处理含酚废水。α-Fe₂O₃在试验中表现出了高臭氧催化活性，催化产生的·OH可对苯酚及中间产物进行无选择性矿化，显著增强了污染物去除效果和臭氧利用水平。为明确催化臭氧氧化过程主要影响因素并优化工艺参数，以苯酚模拟含酚废水，设计了L₁₆(4⁴)正交试验。结果表明，臭氧投加量、催化剂投加量、pH、反应时间是COD去除率及单位臭氧COD降解量的主要影响因素，其中，臭氧投加量与反应时间的影响较为显著。方差分析与试验验证表明，催化剂投加量对COD去除率影响较小，pH对单位臭氧COD降解量影响较小。通过权矩阵计算得到优化后的反应条件：臭氧投加量为5 mg/(L·min)，催化剂投加量为0.10 g/L，pH为9，反应时间为45 min。叔丁醇屏蔽试验表明，·OH显著促进了催化臭氧氧化进程。
- α-Fe₂O₃ /
- 催化臭氧氧化 /
- 苯酚 /
- 正交试验 /
- 权矩阵
Abstract:
The traditional process has a limited effect on the treatment of phenolic wastewater, and catalytic ozonation technology can effectively treat phenolic wastewater. α-Fe₂O₃ has exhibited high ozone catalytic activity in previous experiments. ·OH produced by catalysis can non-selectively mineralize phenol and intermediate products, which significantly enhances the removal of pollutants and the level of ozone utilization. In order to clarify the main influencing factors of the catalytic ozone oxidation process and optimize the process parameters, phenol was used to simulate phenolic wastewater, and L₁₆(4⁴) orthogonal experiment was designed. The results showed that ozone dosage, catalyst dosage, pH, and reaction time were the main influencing factors of COD removal rate and COD degradation per unit ozone. Among them, ozone dosage and reaction time had the most significant impact on the two indicators. Variance analysis and experimental verification showed that catalyst dosage had little effect on COD removal rate, and reaction pH had little effect on COD degradation per unit ozone. The optimized process parameters were calculated by weight matrix: ozone dosage was 5 mg/(L·min), catalyst dosage was 0.1 g/L, pH was 9, and reaction time was 45 min. Tert butyl alcohol shielding experiments showed that ·OH significantly promoted the catalytic ozone oxidation process.
- α-Fe₂O₃ /
- catalytic ozone oxidation /
- phenol /
- orthogonal experiment /
- weight matrix

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图 1 试验流程

Figure 1. Experimental flow chart

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图 2 α-Fe₂O₃的SEM图

Figure 2. SEM images of α-Fe₂O₃

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图 3 COD去除率和单位臭氧COD降解量正交试验效应曲线

Figure 3. Orthogonal test effect curve of COD removal rate and COD degradation per unit ozone

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图 4 臭氧投加量对2项指标影响

Figure 4. Influence of ozone dosage on two indicators

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图 5 催化剂投加量对2项指标影响

Figure 5. Impact of catalyst dosage on two indicators

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图 6 pH对2项指标影响

Figure 6. Influence of pH on two indicators

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图 7 臭氧氧化技术处理苯酚废水的降解过程

Figure 7. Degradation process of phenol wastewater by ozone oxidation

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表 1 α-Fe₂O₃催化臭氧氧化苯酚废水正交试验因素及水平

Table 1. Orthogonal experiment factors and level of α-Fe₂O₃ catalytic ozonation of phenol wastewater

水平	A/〔mg/(L·min)〕	B/(g/L)	C	D/min
1	3	0.01	5	15
2	5	0.05	7	30
3	10	0.10	9	45
4	13	0.50	11	60

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表 2 正交试验设计及试验结果

Table 2. Orthogonal experimental design and experimental results

编号	A	B	C	D	COD去除率/%	单位臭氧COD降解量/(g/mg)
1	1	1	1	1	17.68	0.15
2	1	2	2	2	27.89	0.24
3	1	3	3	3	47.67	0.41
4	1	4	4	4	32.54	0.28
5	2	1	1	2	33.71	0.15
6	2	2	3	1	45.34	0.20
7	2	3	2	4	69.76	0.30
8	2	4	4	3	75.58	0.33
9	3	1	2	3	82.56	0.18
10	3	2	4	4	80.23	0.17
11	3	3	1	1	36.04	0.08
12	3	4	3	2	72.09	0.16
13	4	1	3	4	82.56	0.14
14	4	2	1	3	63.95	0.11
15	4	3	4	2	69.76	0.12
16	4	4	2	1	53.48	0.09

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表 3 正交试验方差分析

Table 3. Orthogonal test variance analysis

正交参数		A	B	C	D
COD去除率	K₁	125.78	216.51	166.24	152.53
	K₂	224.39	217.41	233.69	203.45
	K₃	270.91	223.22	247.65	269.75
	K₄	269.74	233.69	243.25	265.09
	k₁	31.45	54.13	41.56	38.13
	k₂	56.10	54.35	58.42	50.86
	k₃	67.73	55.81	61.91	67.44
	k₄	67.44	58.42	60.81	66.27
	R₁	36.28	4.29	20.35	29.30
单位臭氧COD降解量	Z₁	1.09	0.61	0.61	0.51
	Z₂	0.97	0.72	0.81	0.66
	Z₃	0.58	0.91	0.90	1.02
	Z₄	0.45	0.85	0.77	0.89
	z₁	0.27	0.15	0.16	0.13
	z₂	0.24	0.18	0.20	0.16
	z₃	0.15	0.23	0.22	0.26
	z₄	0.11	0.21	0.18	0.22
	R₂	0.16	0.07	0.06	0.13

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表 4 影响因素方差分析

Table 4. Variance analysis of influencing factors

指标	试验因素	均方	F	显著性
COD去除率/%	A	1 681.46	373.66	++
	B	29.18	6.48	−
	C	387.27	86.06	++
	D	355.25	78.95	++
单位臭氧COD 降解量/(g/mg)	A	0.220	50.90	++
	B	0.004	9.95	+
	C	0.004	8.24	−
	D	0.013	29.25	++
注：+指因素通过0.05的显著性检验；++指因素通过0.01的显著性检验；−指因素影响不显著。

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表 5 优化参数条件下试验结果

Table 5. Experimental results under optimized parameters

指标	试验1	试验2	试验3	均值
COD去除率/%	96.83	97.66	97.44	97.31
单位臭氧COD降解量/(g/mg)	0.56	0.56	0.56	0.56

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