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Integrated treatment method of high-concentration liquid crystal waste water

A treatment method and high-concentration technology, applied in water/sewage treatment, water treatment parameter control, chemical instruments and methods, etc., can solve environmental pollution and other problems, achieve good treatment effect, safe and stable operation, and convenient operation

Inactive Publication Date: 2019-01-04
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing method can produce a large amount of iron slime (the main component is Fe(OH) 3 sedimentation), iron sludge is a hazardous waste, and the discharge of untreated iron sludge will pollute the environment

Method used

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  • Integrated treatment method of high-concentration liquid crystal waste water
  • Integrated treatment method of high-concentration liquid crystal waste water
  • Integrated treatment method of high-concentration liquid crystal waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Fenton-SBR-TiO 2 / Activated carbon-microwave digestion sludge new combination process for high concentration liquid crystal wastewater

[0034] In this embodiment, the liquid crystal wastewater produced by a chemical plant is selected. Its COD concentration is as high as 300,000mg / L, and its pH value is 5-6. In order to improve the safety and efficiency of the Fenton reaction, the liquid crystal wastewater enters the Fenton reactor. Adjust the water quality so that the COD concentration of the wastewater entering the Fenton reactor is 150,000 mg / L, and the pH is about 3; the wastewater is oxidized in the Fenton reactor for about 30-60 minutes, then the reaction is stopped and the supernatant and iron sludge are separated, and the iron sludge is digested by microwave After resource recovery, the supernatant effluent enters the SBR reactor after pH adjustment, and reacts in the SBR reactor for about 20 hours to stop the reaction. After a period of rest, the sup...

Embodiment 2

[0035] Embodiment 2: the removal situation of COD in high-concentration liquid crystal wastewater

[0036] In this embodiment, the high-concentration liquid crystal wastewater in embodiment 1 passes through Fenton-SBR-TiO 2 After the combined process of activated carbon photocatalysis, the removal of COD in each section is as follows figure 2 As shown in the figure, it can be seen from the figure that after 60 minutes of Fenton oxidation pretreatment of liquid crystal wastewater, the COD concentration is reduced from 150,000 mg / L to 2800 mg / L, and the COD removal rate at this stage is as high as 98%. Then the Fenton effluent enters the SBR unit for 20 hours , the COD concentration dropped from 2800mg / L to 512mg / L, and the COD removal rate at this stage was about 82%; finally, the SBR effluent entered TiO 2 / The activated carbon photocatalytic reactor reacted for 2 hours, the COD concentration dropped from 512mg / L to 42mg / L, and the COD water quality index was lower than the...

Embodiment 3

[0037] Embodiment 3: the weight change situation of the generated sludge (mainly iron sludge) after microwave drying

[0038] In this embodiment, the sludge produced in the two sections of Fenton pretreatment and SBR in Example 1 is concentrated and then dried in a microwave oven. The weight of the sludge varies with the microwave digestion time as follows: image 3 As shown, it can be seen from the figure that in the first 20 minutes, the sludge weight decreased sharply with the increase of microwave digestion time; between 20 and 30 minutes, the sludge weight tended to be stable with the extension of microwave digestion time, and 30 minutes The weight of the sludge remained basically the same, which means that the sludge was completely dried, and the sludge was changed from 100g to 24g; during the microwave drying process, the water and a part of the sludge evaporated in the form of water vapor and ash. The remaining composition is mainly Fe(OH) 3 , At the same time, the ba...

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Abstract

The invention belongs to the technical field of chemical production waste water treatment and relates to an integrated treatment method of high-concentration liquid crystal waste water. The method comprises the steps of adjusting the high-concentration liquid crystal waste water, allowing effluent to enter a Fenton reactor for reaction, adjusting a pH (potential of hydrogen) value of a reacted solution to 7, keeping the solution static, taking supernate into an SBR (sequencing batch reactor) for aeration reaction, after natural settling, discharging the supernate into a TiO2 / active carbon photocatalytic reactor, switching on an ultraviolet light source, activating a photocatalytic reaction, and allowing iron sludge generated by the Fenton reactor and little sludge generated in the SBR to enter a microwave degradation furnace for drying and degradation to achieve integrated treatment of the high-concentration liquid crystal waste water. The method is simple and novel in technology, convenient to operate, low in cost and energy consumption, safe and stable in operation, and high in COD (chemical oxygen demand) removal efficiency, and an iron sludge recycling treatment effect is good.

Description

Technical field: [0001] The invention belongs to the technical field of chemical production wastewater treatment, and relates to an integrated treatment method for high-concentration liquid crystal wastewater based on Fenton pretreatment-SBR-TiO 2 / Activated carbon photocatalytic oxidation-microwave digestion sludge new combination process to treat high-concentration liquid crystal wastewater and sludge generated during the treatment process. Background technique: [0002] With the rapid development of the information industry and the electronics industry, liquid crystal displays are more and more widely used in fields such as televisions, mobile phones, and instruments. Monomer liquid crystals are produced by chemical synthesis. The wastewater produced has high concentrations of organic pollutants, complex components, high toxicity, and is difficult to be degraded by microorganisms. The main pollutants in liquid crystal wastewater are dodecyl glucoside (95%) , olefins, sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/32C02F1/66C02F1/722C02F1/725C02F3/1263C02F9/00C02F11/12C02F2209/06C02F2209/08C02F2303/04C02F2305/026C02F2305/10
Inventor 赵宝秀苟天朔张凯欣庄子豪尚西臣杨栋李金成
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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