Strong oxidation coupled short range treatment of refining industry contaminated sites extraction water

doi:10.16085/j.issn.1000-6613.2023-2206

Abstract

Abstract:

The types of pollutants extracted from refinery pollution site are complex and highly toxic, with strong uncertainty in water quality and quantity. Rapid and standardized treatment and on-site reuse are one of the ideal treatment and disposal methods, and efficient treatment technologies and operating parameters need to be optimized to shorten the treatment process. The optimal conditions for Fenton and optoelectronic coupling treatment through orthogonal experiments to form a short-range treatment process for extracted water were investigated. The results showed that the key influencing factor of chemical Fenton was the mass ratio of H₂O₂ to organic pollutants (characterized by COD). Coupled with ultraviolet light irradiation, the efficiency of the agent could be improved and the amount of sludge could be reduced. The key electrochemical influencing factor was the distance between the electrode plates, followed by the type of electrode plates. Under the optimal treatment conditions determined by orthogonal experiments, the coupled process could achieve a total removal efficiencies of 88.33% for TOC and 98.09% for TN in the extracted water, which could meet the requirements of on-site reuse water index (≤40mg/L) for TN in the effluent. The Fenton and photoelectric coupling treatment formed could significantly shorten the existing treatment process, reduce the dosage of chemicals, thereby reducing the amount of sludge, and ensure the stability and compliance of the effluent. This study indicated that Fenton and photoelectric coupling technology can quickly and efficiently remove high concentration of pollutants from the extracted water of refinery pollution sites, supporting the rapid implementation of contaminated site remediation projects. At the same time, it can avoid environmental risks of sewage transportation and impact on the advanced processes of sewage treatment plants, providing important references for the selection of efficient and rapid treatment processes on site and the adjustment of operating parameters.

Key words: refinery pollution site, extraction water, photo-fenton, electrochemistry, photoelectric coupling, short range processing

摘要：

炼化污染场地抽出水中污染物种类复杂、毒性强，水质水量不确定性强，快速达标处理并就地回用是较为理想的处理处置途径之一，需优选高效处理技术和运行参数，缩短处理流程。研究通过正交实验优选芬顿与光电耦合处理的最优条件，形成抽出水短程处理工艺。结果表明：化学芬顿关键影响因素为H₂O₂与有机污染物（以COD表征）的质量比，耦合紫外光照射后可提高药剂效率降低泥量，电化学关键影响因素为极板间距，其次为极板种类。在正交实验确定的最优处理条件下，耦合工艺对抽出水中TOC的总去除率可达88.33%，TN总去除率可达98.09%，可使出水TN达到现场回用水指标（≤40mg/L）要求。形成的芬顿与光电耦合处理工艺能大幅度缩短现有处理流程，减少药剂投加从而减少污泥量，并保证出水的稳定达标。该研究表明，芬顿与光电耦合技术可快速高效去除炼化污染场地抽出水中高浓度污染物，支撑污染场地修复工程的快速实施，同时能避免污水拉运的环境风险以及对污水处理厂先行工艺的冲击，为现场高效快速处理工艺的选择及其运行参数的调节提供重要参考。

关键词: 炼化污染场地, 抽出水, 光芬顿, 电化学, 光电耦合, 短程处理

CLC Number:

X703.1

LUO Zhen, WANG Qingji, WANG Zhansheng, YANG Xueying, XIE Jiacai, WANG Hao. Strong oxidation coupled short range treatment of refining industry contaminated sites extraction water[J]. Chemical Industry and Engineering Progress, 2024, 43(7): 4155-4163.

罗臻, 王庆吉, 王占生, 杨雪莹, 谢加才, 王浩. 炼化污染场地抽出水强氧化短程处理工艺[J]. 化工进展, 2024, 43(7): 4155-4163.

Figures/Tables 15

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指标	数值	指标	数值
pH	8.96	[Cl^-]/mg·L^-1	7615
电导率/ms·cm^-1	17.63	COD/mg·L^-1	3900
悬浮物/mg·L^-1	92	TOC/mg·L^-1	996
浊度/NTU	54	TN/mg·L^-1	1666.32
硬度/mg·L^-1	1100	[NH₃-N]/mg·L^-1	1129.28
石油类/mg·L^-1	171	硫化物/mg·L^-1	1.66

指标	数值	指标	数值
pH	8.96	[Cl^-]/mg·L^-1	7615
电导率/ms·cm^-1	17.63	COD/mg·L^-1	3900
悬浮物/mg·L^-1	92	TOC/mg·L^-1	996
浊度/NTU	54	TN/mg·L^-1	1666.32
硬度/mg·L^-1	1100	[NH₃-N]/mg·L^-1	1129.28
石油类/mg·L^-1	171	硫化物/mg·L^-1	1.66

差异源	平方和	df	均方	F	p
A	0	2	0	75.919	0.013*
B	0.004	2	0.002	826.313	0.001***
C	0	2	0	35.508	0.027*

差异源	平方和	df	均方	F	p
A	0	2	0	75.919	0.013*
B	0.004	2	0.002	826.313	0.001***
C	0	2	0	35.508	0.027*

因子	值	样本量	TOC的去除率	标准差	F	p	偏Eta方
A	3	3	0.6	0.03	0.264	0.776	0.081
	3.5	3	0.61	0.03
	4	3	0.62	0.02
	总计	9	0.61	0.02
B	1.5∶1	3	0.58	0.01	22.049	0.002**	0.88
	2∶1	3	0.61	0.01
	2.5∶1	3	0.63	0
	总计	9	0.61	0.02
C	1∶3	3	0.61	0.03	0.118	0.891	0.038
	1∶3.5	3	0.61	0.02
	1∶4	3	0.6	0.03
	总计	9	0.61	0.02