Ozone and photoelectrocatalysis combined treatment method of reverse osmosis membrane concentrated water in refinery waste water

A technology of reverse osmosis concentrated water and reverse osmosis membrane, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Problems such as large amount of mud

Active Publication Date: 2013-12-25
CHINA NAT OFFSHORE OIL CORP +3
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Problems solved by technology

These wastewaters mainly contain xylene, ethylene oxide, phenol, alkanes and other refractory pollutants. In addition, they also contain high dissolved solids, which have an inhibitory effect on the biochemical system. Traditional biochemical and other treatment processes are difficult to make them Discharge
Conventional physical and chemical methods have the disadvantages of poor removal effect and high cost
At present, there are many methods such as Fenton oxidation method, which has better treatment performance, but has the disadvantages of being greatly affected by pH and generating a large amount of sludge.
Among other existing treatment methods, the wet oxidation method has harsh process conditions and high treatment costs; distillation concentration is only the separation of pollutants and water, and does not really remove pollutants; the cost of activated carbon adsorption treatment is high

Method used

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  • Ozone and photoelectrocatalysis combined treatment method of reverse osmosis membrane concentrated water in refinery waste water
  • Ozone and photoelectrocatalysis combined treatment method of reverse osmosis membrane concentrated water in refinery waste water

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Effect test

Embodiment 1

[0015] A petrochemical company in Ningbo City, Zhejiang Province mainly refines marine heavy crude oil with the characteristics of high density and high acid value. It has the characteristics of high salt content, high content of naphthenic acid dissolved oil, and poor biochemical properties. It is difficult to discharge COD in the effluent after traditional treatment. When reverse osmosis concentrated water is treated with ozone combined with photoelectric catalytic oxidation combined process, the influent water quality indicators are shown in Table 1:

[0016] Table 1. Reverse osmosis concentrated water quality indicators

[0017] COD (mg / L)

[0018] Using the combined process of ozone combined with photoelectric catalytic oxidation, 5mg / L of ozone is introduced into the influent water, and after 20 minutes of reaction, 200mg / L of photoelectric auxiliary agent is added to the effluent water, which is pumped into the photoelectric catalytic oxidation reactor, and th...

Embodiment 2

[0023] Refining sewage produced by a petrochemical company in Tianjin will produce a certain amount of concentrated liquid after being treated by an ultrafiltration-reverse osmosis double membrane system. The company’s reverse osmosis concentrated water also has the characteristics of high salt content, complex organic components, and poor biochemical properties. When the combined process of ozone combined with photoelectric catalytic oxidation treats the reverse osmosis concentrated water of the company, the influent water quality indicators are shown in Table 3:

[0024] Table 3. Reverse osmosis concentrated water quality indicators

[0025] COD (mg / L)

[0026] Ozone combined with photoelectric catalytic oxidation combined process is adopted. First, 10 mg / L of ozone is introduced into the influent water, and after 30 minutes of reaction, 200 mg / L of photoelectric auxiliary agent is added to the effluent water, which is injected into the photoelectric catalytic oxida...

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Abstract

The invention discloses an ozone and photoelectrocatalysis combined treatment method of reverse osmosis membrane concentrated water in refinery waste water. The method is characterized in that the method comprises the steps that the reverse osmosis membrane concentrated water in the refinery waste water is pretreated by an ozone oxidation technology at normal temperature and pressure; nondegradable organic matters in the water are subjected to open loop and chain scission; and the nondegradable organic matters in the water are removed effectively by a photoelectrocatalysis oxidation advanced treatment technology. The reverse osmosis membrane concentrated water finally achieves standard emission by the technologies. A particular technological process is as follows: the reverse osmosis membrane concentrated water is homogenized by a regulating basin (1), and enters an ozone preoxidation tank (3) through a water supply pump; the concentrated water and ozone provided by an ozone reactor (2) are mixed sufficiently and react in the tank; a photoelectric assistant (4) is added to outflowing water; the outflowing water is pumped into a photoelectrocatalysis oxidation reactor (5); and then the outflowing water flows into a clean water basin.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment. The invention relates to an ozone photocatalytic combined treatment method for oil refinery wastewater reverse osmosis membrane concentrated water; that is, the reverse osmosis concentrated water is treated to meet the discharge standard through the synergistic effect of ozone pre-oxidation and photoelectric catalytic oxidation. Background technique [0002] At present, the treatment of reverse osmosis membrane concentrated water in the refining and chemical industry is the key and difficult point in the advanced treatment and reuse of sewage. These wastewaters mainly contain xylene, ethylene oxide, phenol, alkanes and other refractory pollutants. In addition, they also contain high dissolved solids, which have an inhibitory effect on the biochemical system. Traditional biochemical and other treatment processes are difficult to make them Discharge. Conventiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
Inventor 滕厚开赵培江谢陈鑫王仕文郑书忠姚万贺张艳芳陈俊李肖琳秦微
Owner CHINA NAT OFFSHORE OIL CORP
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