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Micro-series-wound-internal circulating photoelectric catalysis oxidation wastewater treatment method

A technology for photoelectric catalysis and oxidation of wastewater, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. life reduction and other problems, to achieve the effect of reducing energy consumption, reducing energy consumption and prolonging service life

Active Publication Date: 2013-12-18
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, the photoelectric catalytic oxidation wastewater treatment method has been successfully applied in the high-salt wastewater treatment industry. When the oxidation reaction proceeds, a large amount of OH will be generated at the cathode - , while OH - and Ca in 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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  • Micro-series-wound-internal circulating photoelectric catalysis oxidation wastewater treatment method

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Embodiment 1

[0050] This embodiment is an embodiment of the wastewater treatment system structure and equipment composition of a micro-series-internal circulation photocatalytic oxidation wastewater treatment method of the present invention. like Figure 1-4 As shown, except that the main body structure and equipment technical features of the present invention are consistent with the previous description, its reference signs and equipment components have been further described in detail.

[0051] 1) The main system structure includes:

[0052] A, micro-series photocatalytic oxidation wastewater treatment unit; composed of micro-series photocatalytic oxidation wastewater treatment device 20;

[0053] The micro-series photoelectric catalytic oxidation reaction device of the present invention is formed by seamless welding of 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...

Embodiment 2

[0066] This example is an application example of the method of the present invention for actually treating wastewater. 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 refinery sewage enters the first anode chamber 7 in the head end of the device through the waste water inlet of the micro-series photocatalytic wastewater treatment device, and reacts under the action of the photocatalyst in the anode chamber 7, and the effluent flows from the top of the anode chamber 7 The outflow passes through the anode connecting pipe 17 and enters from the bottom of the next adjacent anode chamber 7 to continue photoelectrocatalytic treatment until it enters the last anode chamber 7 at the tail of the device and obtai...

Embodiment 3

[0068] This embodiment is another application embodiment of the method of the present invention for actually treating wastewater. 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 photocatalytic oxidation wastewater treatment method to treat the company's reverse osmosis concentrated water, the specific steps are basically the same as in Example 2. Similarly, only by adjusting the hydraulic retention time in the reaction device to 2 hours, the CODcr of the final effluent is reduced to 30-40mg / L, which meets the discharge water quality requirements.

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Abstract

The invention provides a micro-series-wound-internal circulating photoelectric catalysis oxidation wastewater treatment method which is characterized by comprising the following steps: at normal temperature and pressure, after pretreatment of organic wastewater, wastewater enters into a first anode chamber at the first end of a micro-series-wound photoelectric catalysis oxidation wastewater treatment unit for photoelectric catalysis oxidation treatment; effluent enters into an adjacent anode chamber through an anode communicating pipe for continuous photoelectric catalysis oxidation treatment till the effluent enters into the last anode chamber at the tail end for photoelectric catalysis oxidation treatment so as to obtain treated wastewater, wherein the hydraulic retention time in the whole micro-series-wound photoelectric catalysis oxidation unit device is 0.5-2 hours; gas-liquid separation is carried out on the wastewater after treatment through a micro-series-wound-internal circulating photoelectric catalysis oxidation wastewater treatment post-treatment unit; innocent treatment is carried out on separated tail gases; the effluent separated is discharged with standards. The method provided by the invention can improve the photoelectric treatment efficiency and effectively treat high salinity and high hardness wastewater, and further can effectively solve the problem that the light sources and the plates are hardened when high hardness wastewater is treated.

Description

technical field [0001] The invention relates to the technical field of high-salt wastewater treatment, in particular to a micro-series-internal circulation photoelectric catalytic oxidation wastewater treatment method for treating high-salt, high-hardness and refractory organic wastewater. 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 wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
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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