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Micro-series-wound photoelectric catalysis oxidation wastewater treatment device

A technology for photoelectric catalysis and oxidation of wastewater, which is applied in the fields of illumination water/sewage treatment, sterilization/microdynamic water/sewage treatment, etc. It can solve the problems of electrode life reduction, ultraviolet light attenuation, current efficiency decline, etc., and prolong the service life. , the effect of reducing corrosion rate and energy consumption

Active Publication Date: 2014-09-17
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] On the other hand, as a new advanced oxidation technology, photoelectric catalytic oxidation has been successfully applied in the high-salt wastewater treatment industry, but traditional photoelectric equipment is not suitable for the treatment of high-hard wastewater. A large amount of OH- is produced at the cathode, and OH- will react with Ca in the wastewater 2+ , Mg 2+ Reaction, fouling on the cathode plate and the outer layer of the light source, when the generated scale accumulates to a certain extent, it will lead to a decrease in current efficiency and a serious attenuation of ultraviolet light, which will sharply deteriorate the treatment effect of photocatalytic oxidation
At present, most manufacturers use the periodic commutation descaling technology to solve the fouling problem, but the periodic commutation technology has two disadvantages: first, the positive and negative poles must use the same material plate, which is expensive, and second, the periodic commutation is easy to make the poles The plate forms a capacitive effect, resulting in a decrease in the life of the electrode

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Embodiment 1

[0045] This embodiment is a structure and composition embodiment of the device of the present invention. Such as Figure 1-4 As shown, the micro-series photoelectric catalytic oxidation wastewater treatment device of the present invention is seamlessly welded by acid and alkali resistant hard PVC plastic, and the exterior is supplemented by a closed stainless steel plate to make it have a certain pressure resistance. Internally according to anode plate 1, anion selective permeable membrane 4, cathode plate 3, anion selective permeable membrane 4, anode plate 1, anion selective permeable membrane 4, cathode plate 3... anion selective permeable membrane 4 , the sequence of the anode plate 1 is arranged so that the inner part of the box is divided into 3 anode chambers and 2 cathode chambers (such as Figure 1-2As shown), in the actual process, according to the different processing capacity, different sets of cathode and anode chambers are set up, preferably 3-10 sets of cathode...

Embodiment 2

[0054] It is the actual application embodiment of this device. The concentration of calcium ions in the refining wastewater produced by a petrochemical company in Tianjin is about 1000mg / L, the concentration of chloride ions is 1800mg / L, the conductivity is 8000μs / cm, and the COD after biochemical treatment is 100-200mg / L, which cannot reach the relevant effluent discharge standard. The micro-series photoelectric catalytic oxidation wastewater treatment device and process were used to carry out engineering application research on the high-hard wastewater. The hydraulic retention time in the device was 1 hour, and the CODcr in the final effluent quality was reduced to 40-50mg / L, which met the discharge water quality requirements. .

Embodiment 3

[0056] It is another practical application embodiment of the device. Refining sewage produced by a petrochemical company in Zhejiang will produce a certain amount of concentrated liquid after being treated by an ultrafiltration-reverse osmosis double-membrane system. The reverse osmosis concentrated water has the characteristics of high salt content, complex organic components, and poor biochemical properties. The total hardness is 2300mg / L, the COD is 150-200mg / L, and the conductivity is 19000μs / cm. When using the micro-series-internal circulation photoelectric catalytic oxidation wastewater treatment device and process to treat the company's reverse osmosis concentrated water, the hydraulic retention time in the device For 2 hours, the final effluent CODcr was reduced to 30-40mg / L, meeting the discharge water quality requirements.

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Abstract

The invention provides a micro-series-wound photoelectric catalysis oxidation wastewater treatment device which is characterized by consisting of a plurality of cathode chambers and anode chambers separated by anion selective permeable membranes, wherein the anion selective permeable membranes are located between the cathode plates and the anode plates. The device is internally divided into a plurality of cathode chambers and anode chambers sequentially arranged. A plurality of light sources are arranged inside each anode chamber which is filled with a photoelectric catalyst. The anode chambers are main chambers for wastewater treatment, and adjacent anode chambers are connected through the anode plate, so that all anode chambers in the device are in a micro-series-wound state. Each cathode chamber is filled with a cathode plate anti-scaling liquid, and bottoms of all cathode chambers are intercommunicated. The micro-series-wound photoelectric catalysis oxidation device provided by the invention not only can improve the photoelectric treatment efficiency, but also can effectively solve the problem that the light sources and the plates are hardened when high hardness wastewater is treated, so that frequent cleaning is avoided, and long-term stable operation of the device is guaranteed.

Description

technical field [0001] The invention relates to the technical field of high-salt wastewater treatment, in particular to a micro-series photoelectric catalytic oxidation wastewater treatment device. Background technique [0002] In recent years, the country has become more and more demanding on environmental protection, and has clearly stipulated the discharge standards for the external drainage of petrochemical enterprises, requiring the external drainage to be further reduced, or even close to zero discharge, and improving the water reuse rate has become a current research topic. hot spot. More and more refineries use ultrafiltration-reverse osmosis double-membrane method to treat refinery oily wastewater for reuse, so as to reduce the amount of external discharge. However, the ultrafiltration-reverse osmosis double-membrane method can only produce about 75% of reused purified water, and the remaining 25% of the double-membrane concentrated water has the characteristics of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F1/467
Inventor 谢陈鑫秦微李肖琳滕厚开郑书忠张艳芳赵慧
Owner CHINA NAT OFFSHORE OIL CORP
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