Technology for recycling wastewater resulted from production of aromatic polycarboxylic acid

A technology for the production of aromatic carboxylic acid and waste water, which is applied in water/sewage multi-stage treatment, light water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of petrochemical waste water treatment that have not been reported, and achieve cost The effect of low cost, reduced equipment and shortened process flow

Inactive Publication Date: 2010-08-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on photocatalytic technology mainly focuses on the preparation and modification of photocatalyst, the design and improvement of photocatalytic reactor, etc., and the treatment of actual petrochemical wastewater has not been reported yet.

Method used

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  • Technology for recycling wastewater resulted from production of aromatic polycarboxylic acid
  • Technology for recycling wastewater resulted from production of aromatic polycarboxylic acid
  • Technology for recycling wastewater resulted from production of aromatic polycarboxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The waste water enters the T-type filter filter, the filtrate enters the fixed bed photocatalytic reactor, and 400kgTiO is added 2 The photocatalyst is placed in a photocatalytic reactor, the light source power is 50W, and the reaction temperature is 30°C. The wastewater stays in the photocatalytic reactor for 1 hour, and the effluent from the reactor enters the ion exchange column. The resin uses a strongly acidic styrene-based cation exchange resin, and the residence time of the wastewater in the ion exchange column is 0.5 hour. After the whole system was running for 4 hours, samples were taken to analyze the PT acid content, metal ion content, and COD value in the water, and the removal rate of each index was calculated. The results are shown in Table 1.

Embodiment 2

[0036] The waste water enters the duplex switching filter, the filtrate enters the fluidized bed photocatalytic reactor, and 1000kg Fe-TiO is added 2 / AC photocatalyst in a photocatalytic reactor, the light source power is 100W, and the reaction temperature is 50°C. The wastewater stays in the photocatalytic reactor for 2 hours, and the effluent from the reactor enters the ion exchange column. The resin uses a super-porous bispolystyrene cationic resin, and the residence time of the wastewater in the ion exchange column is 1 hour. After the whole system was running for 4 hours, samples were taken to analyze the PT acid content, metal ion content, and COD value in the water, and the removal rate of each index was calculated. The results are shown in Table 1.

Embodiment 3

[0038] 10%Fe-TiO 2 / 1.4% NH 4 + -AC(TiO 2 The loading quality is 18%) preparation steps:

[0039] (1) preparation molar concentration is 1L of ethanol aqueous solution of 3mol / L, under stirring, add 57g ferric sulfate and 20g ammonium nitrate, form solution A after mixing;

[0040] (2) Prepare 1 L of a mixed solution of n-butyl titanate and ethanol with a molar concentration of 2 mol / L, and add 0.4 g of hydroxypropyl cellulose to form a solution B;

[0041] (3) Add 500g gac to A solution, after stirring evenly, form solution A1, the solution B in the step (2) is separated by 400cm 3 The speed of / h is added dropwise in the A1 solution;

[0042](4) preparation molar concentration is 1L of aqueous ethanol solution of 3mol / L, under stirring, add 57g ferric sulfate and 20g ammonium nitrate, form solution A after mixing;

[0043] (5) Prepare 1 L of a mixed solution of n-butyl titanate and ethanol with a molar concentration of 2 mol / L, and add 0.4 g of hydroxypropyl cellulose ...

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Abstract

The invention discloses a technology for recycling wastewater resulted from the production of aromatic polycarboxylic acid. Combined technology including filtering, photocatalytic oxidation and ion exchange resin is adopted to process the wastewater resulted from the production of aromatic polycarboxylic acid so that the wastewater can be recycled. The technology comprises that: suspending substances in the wastewater are removed by using a filter reactor in order to ensure that solid particles cause no impact to subsequent technologies, the completely-filtered wastewater enters a photocatalytic reactor, organic substances dissolved in the water are removed, the wastewater degraded by means of photocatalysis enters an ion exchange column, and metal ions in the water are removed. The technology can achieve the COD removal rate of discharged water reaching over 90%, the removal rate of PT acid reaching over 92% and the removal rate of metal ions reaching over 90%, and can greatly reduce the investment on equipment, floor area and running period.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and industrial wastewater reuse, and in particular relates to a recycling process of aromatic carboxylic acid production wastewater. Background technique [0002] A large amount of high-concentration organic wastewater is produced during the production of aromatic carboxylic acids. This wastewater has the characteristics of large changes in water quality and quantity, high concentration of pollutants, many types of pollutants, and a wide range of pH value fluctuations. It is one of the more difficult petrochemical wastewaters to treat. First, if it is directly discharged into the natural environment, it will cause damage to the aquatic ecology and must be dealt with. [0003] The treatment methods of aromatic carboxylic acid wastewater mainly include physical chemical method and biochemical method. Among them, the physical and chemical methods mainly include acid crystallization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/30C02F1/42
Inventor 管国锋万辉陈越峰杨操
Owner NANJING UNIV OF TECH
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