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Device for treating oily wastewater by photocatalytic-oxidation composite diatomite-based nano-ceramics and method

A technology of photocatalytic oxidation and composite diatomite, which is applied in the field of water treatment, can solve the problems of increased floor area and maintenance cost, secondary pollution, and repeated times, so as to save the floor area and cost of treatment, and reduce the treatment cost. Cost, the effect of improving processing efficiency

Active Publication Date: 2018-06-22
SHANGHAI MARITIME UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional demulsification method has disadvantages such as low efficiency, poor treatment effect, long time consumption, and high cost. A single demulsification method cannot completely separate the oil-water mixture, and the coordinated treatment of different methods will increase the floor area and maintenance. cost
[0004] After searching the literature of the prior art, it is found that the Chinese patent with publication number CN105366836A discloses a process and device for circulating multi-dimensional catalytic advanced oxidation treatment of oily wastewater. , there will be secondary pollution and other phenomena
The Chinese patent with the publication number CN105399265A discloses a method for the treatment and reuse of oily wastewater. + Reverse osmosis system" process treats oily wastewater produced by oil refineries. The disadvantage of this method is: the amount of sewage treatment is huge, and complex physical, chemical, and biological methods are required to treat oily wastewater. Management and maintenance are inconvenient and costly. High, the reverse osmosis membrane used in the treatment process is easy to clog and cause secondary pollution
However, this method requires batches of H 2 o 2 , although the agent has strong oxidizing properties, its chemical stability is not high, and it can undergo self-decomposition reaction at normal temperature and pressure, and it is highly corrosive to metal devices. Management can cause a lot of inconvenience
[0005] By searching existing patents and literature, no one-step treatment method based on photocatalytic oxidation composite diatomite-based nano-ceramic for oily wastewater demulsification, oil-water separation and organic matter degradation was found

Method used

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  • Device for treating oily wastewater by photocatalytic-oxidation composite diatomite-based nano-ceramics and method
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  • Device for treating oily wastewater by photocatalytic-oxidation composite diatomite-based nano-ceramics and method

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Experimental program
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Effect test

Embodiment 1

[0051] It was taken from oily wastewater from an oil field. The oily wastewater had an oil content of 10%, a pH of 9.28, and a COD of 1263 mg / L, all of which failed to meet the standards. The oily wastewater is first filtered through a filter with a pore size of 100 μm, and then enters the photocatalytic oxidation composite diatomite-based nano-ceramic system 1 through the water inlet 4, and the compressed air in the reaction system enters the aeration ceramic 6 through the air inlet 5, and the aeration The ceramics are quartz aerated ceramics with a flow rate of 100L / h. The light source of the ultraviolet lamp 2 is a low-pressure mercury lamp with a dominant emission wavelength of 254nm. The chemical composition of the diatomite-based nano-ceramic 1 is The pore size of the ceramic is 0.5 μm, and the nano photocatalytic material loaded on the surface of the ceramic is titanium dioxide photocatalytic powder. The photocatalytic oxidation composite nano ceramic is fixed in the ...

Embodiment 2

[0053] The drilling fluid is taken from an offshore drilling platform. The relevant physical and chemical parameters of the drilling fluid: oil content is 12%, pH value is 6.89, COD is 15000mg / L, suspended solids is 500mg / L, etc. The relevant indicators have not reached GB 4914-2008《 Discharge standards in "Limits of Pollutant Discharge Concentration Values ​​for Offshore Oil Exploration and Development". The oily wastewater first goes through the pretreatment step to remove large particles of solid matter, and enters the photocatalytic oxidation composite diatomite-based nano-ceramic 1 system through the water inlet 4, and the compressed air in the system enters the aeration ceramic 6 through the air inlet 5, and the aeration The ceramics are quartz aerated ceramics, the aeration flow rate is 150L / h, the ultraviolet light source 2 uses a 254nm low-pressure mercury lamp, and the main chemical composition of the diatomite-based nano-ceramic 1 is The pore size of the ceramic is...

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Abstract

The invention provides a device for treating oily wastewater based on photocatalytic-oxidation composite diatomite-based nano-ceramics. The device comprises oil-water separating, filtering, adsorbingand photocatalytic treating modules; and during treatment, the modules act simultaneously, treatment steps, which originally need multiple steps and a long time, are integrated and completed in one device, and the treatment effect on the oily wastewater is good. The invention further provides a method for treating the oily wastewater based on the photocatalytic-oxidation composite diatomite-basednano-ceramics.

Description

technical field [0001] The invention relates to the field of water treatment, and belongs to a device and method for treating oily wastewater based on nano-photocatalysis coupling diatomite-based ultrafiltration ceramics. Background technique [0002] Oily wastewater has a wide range of sources, and a large amount of industrial wastewater is produced in daily life and industrial production. The sources of these oily wastewater are: In the machining industry, the metal cutting fluid used for cooling and lubricating tools is the oil-in-water (O / W) after dilution with lubricating oil and related chemical additives. In the petrochemical industry, oil condensation and cleaning water for related oil production and processing equipment are high-concentration oily wastewater in the process of oil extraction, refining, storage, and transportation; in the food processing process of the catering industry The mixture of edible oil and water, etc. [0003] The above-mentioned oily wast...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/32
CPCC02F1/001C02F1/28C02F1/32C02F1/40C02F9/00C02F2101/32C02F2301/08C02F2303/04
Inventor 李庆宏张丽董耀华董丽华佟宇辰申媛媛刘景榕胡浩朱红玲
Owner SHANGHAI MARITIME UNIVERSITY
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