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Process method for performing advanced treatment on petrochemical wastewater through catalytic ozonation

A technology of ozone catalytic oxidation and advanced treatment, which is applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of increasing investment costs, difficulty in operation and management, incomplete ozone oxidation, and restrictions on large-scale application, so as to improve the utilization rate of ozone and catalyze Oxidation efficiency, improvement of ozone catalytic oxidation efficiency and ozone utilization rate, and the effect of preventing poisoning

Active Publication Date: 2013-09-04
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in the ozone oxidation technology, which limit its large-scale application in the field of wastewater treatment, mainly in the following three aspects: first, the low utilization rate of ozone and large dosage, resulting in a significant increase in treatment costs; second, the impact of ozone on The oxidation of organic matter is selective, so some organic matter cannot be removed; the third is that the ozone oxidation is not complete, and the macromolecular refractory organic matter is usually converted into small molecular substances, which cannot be completely removed. It needs to be combined with biochemical technology to complete the thorough removal of pollutants. removed, which increases investment costs and difficulty in operation and management

Method used

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  • Process method for performing advanced treatment on petrochemical wastewater through catalytic ozonation

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Embodiment 1

[0020] A refining and chemical company in Heilongjiang has a daily wastewater treatment volume of 2400m3 / d, which is currently treated by a secondary biochemical process. In order to realize the comprehensive reuse of sewage, it is planned to upgrade the existing process and add an advanced treatment unit on the basis of the original secondary biochemical treatment process. Adopt the ozone catalytic oxidation process method of the present invention (attachment figure 1 (shown) advanced treatment of the secondary biochemical effluent, and carried out a field pilot test with a scale of 15m3 / d. The hydraulic retention time of the factory's secondary biochemical effluent in the pre-oxidation tower 1, catalytic oxidation tower Ⅰ2 and catalytic oxidation tower Ⅱ3 are 0.5h, 1h and 0.5h respectively, and the dosage of ozone is 30~45mg / L, 30~ 45mg / L and 10~15mg / L. The pre-oxidation tower 2 operates under pressure, and the pressure is controlled at 0.02~0.05Mpa. Ozone is produced by ...

Embodiment 2

[0023] A petrochemical company in Guangdong treats 1200m3 of waste water per day. At present, it adopts secondary biochemical process for treatment, and there is a problem that the waste water is difficult to meet the discharge standard. Adopt the ozone catalytic oxidation process method of the present invention ( figure 1 Shown) was carried out on-site small test research. The hydraulic retention time of the plant's secondary biochemical effluent in the pre-oxidation tower 1, catalytic oxidation tower Ⅰ2 and catalytic oxidation tower Ⅱ3 are 0.5h, 1.5h and 0.5h respectively, and the dosage of ozone is 60~80mg / L, 40 ~60mg / L and 30~40mg / L. The pre-oxidation tower 2 operates under pressure, and the pressure is controlled at 0.02~0.05Mpa. Ozone is produced by an oxygen-enriched source ozone generator 7, and the ozone concentration is 100-150 mg / L.

[0024] The influent COD of the advanced treatment device is 128-325 mg / L, with an average of 234 mg / L. After being treated by the ...

Embodiment 3

[0026] A petrochemical company in Tianjin treats 1,800m3 of waste water per day. Currently, it adopts a secondary biochemical process for treatment. Occasionally, the waste water does not meet the standard. It plans to increase the ozone catalytic oxidation advanced treatment process ( figure 1 shown), and conducted a field test study on it. The hydraulic retention time of the factory's secondary biochemical effluent in the pre-oxidation tower 1, catalytic oxidation tower Ⅰ2 and catalytic oxidation tower Ⅱ3 are 10min, 15min and 10min respectively, and the dosage of ozone is 10~15mg / L and 10~15mg / L respectively. L and 5~10 mg / L. The pre-oxidation tower 2 operates under pressure, and the pressure is controlled at 0.02~0.05Mpa. Ozone is produced by an oxygen-enriched source ozone generator 7 with an ozone concentration of 50-80 mg / L.

[0027] The influent COD of the advanced treatment device is 78-135 mg / L, with an average of 107 mg / L. After being treated by the process of the ...

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Abstract

The invention discloses a process method for performing advanced treatment on petrochemical wastewater through catalytic ozonation. The method is characterized by comprising the following steps of: allowing petrochemical wastewater to sequentially flow through a pre-oxidation tower, a catalytic oxidation tower I and a catalytic oxidation tower II, and respectively filling high-porosity inert filler, activated aluminum oxide-based catalyst and granular active carbon in three towers, wherein the pre-oxidation tower operates under pressure. The ozone is prepared by an oxygen-enriched source or oxygen source ozone generator, and tail gas in the tower is collected and treated in a unified mode.

Description

technical field [0001] The invention relates to industrial wastewater treatment technology, in particular to a process method for advanced treatment of petrochemical wastewater by ozone catalytic oxidation. Background technique [0002] Petrochemical wastewater usually contains a large amount of refractory organic matter and toxic and harmful substances, which affects the treatment effect of traditional biochemical processes. With the improvement of my country's environmental protection standards and the demand for sewage resources, the development of new advanced sewage treatment technologies has become an inevitable trend. [0003] Ozone is a strong oxidizing agent, which can convert macromolecular refractory organic matter in wastewater into small molecular substances through chain breaking and ring opening, and then further mineralize into carbon dioxide and water to achieve complete removal of organic matter. In addition, the ozone is decomposed to produce oxygen, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78
Inventor 陆彩霞郑书忠陈爱民钱光磊张艳芳陈军
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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