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Process for treating waste water of refined terephthalic acid

A technology of purified terephthalic acid and its treatment method, which is applied in the field of waste water treatment of purified terephthalic acid, can solve the problems of unfavorable operation of large equipment, large equipment footprint, and reduced adsorption efficiency, and achieve good treatment effect, Effects of reduced floor space and reduced operating costs

Inactive Publication Date: 2007-03-14
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this treatment method are: long residence time, large area occupied by the device, small operating flexibility, low treatment efficiency, high comprehensive cost, and sometimes the fluctuation of the source water quality may cause the final outlet water quality to exceed the standard
This technology achieves the effective separation of benzene series organic matter and wastewater to a certain extent, but at the same time, the resin is regenerated through repeated elution, and its adsorption efficiency is also greatly reduced, which affects its treatment capacity and is unfavorable to the operation of large devices.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 1000ml into the container after 30 hours of gravity sedimentation and filtration of PTA waste water, and drop 5% oxidant ClO into it 2 Aqueous solution with a concentration of 0.03%, then stirred and mixed evenly, pumped the prepared wastewater into a fixed-bed catalytic reactor filled with a 2% concentration of cobalt nitrate solution-loaded activated carbon catalyst through a metering pump to carry out oxidation and degradation reactions, and the oxidation tower was filled with voids During the reaction process, air is blown into the reaction tower by a fan, the volume ratio of air to waste water is 105-110: 1, the pH value of the solution is 4.5, the reaction temperature is room temperature, and the waste water is kept in the tower. The residence time is 60min, the COD of the treated wastewater is reduced to 420mg / L, the terephthalic acid and benzoic acid are reduced to 5ppm, and after aeration treatment reaches the standard, it directly enters the next-level bi...

Embodiment 2

[0025] In the same device of embodiment 1, weighing 1500ml drops into the container through the PTA waste water after settling, filtering, and drops into 20% oxygenant ClO wherein 2 Aqueous solution with a concentration of 5%, then stirred and mixed evenly, the prepared waste water is pumped into a fixed-bed catalytic reactor filled with a 5% concentration cobalt nitrate solution-loaded activated carbon catalyst through a metering pump to carry out oxidation degradation reaction, and the oxidation tower is filled with a void ratio During the reaction process, oxygen is blown into the reaction tower by a fan, the volume ratio of oxygen to waste water is 105-110:1, the pH value of the solution is 4.5, and the reaction temperature is room temperature to keep the waste water in the tower. The residence time is 60min, the COD of the treated wastewater is reduced to 408mg / L, and the terephthalic acid and benzoic acid are reduced to 5ppm. After aeration treatment, it can directly ente...

Embodiment 3

[0027] In the same device of embodiment 1, weighing 1000ml drops into the container through the PTA waste water after settling, filtering, and drops into 10% oxygenant ClO wherein 2 Aqueous solution with a concentration of 1%, then stirred and mixed evenly, pumped the prepared waste water into a fixed-bed catalytic reactor filled with 8% ferric nitrate solution loaded activated carbon catalyst through a metering pump to carry out oxidation degradation reaction, and the oxidation tower was filled with a void ratio During the reaction process, air is blown into the reaction tower by a fan, the volume ratio of air to waste water is 105-110: 1, the pH value of the solution is 4.5, the reaction temperature is room temperature, and the waste water is kept in the tower. The residence time is 90min, the COD of the treated wastewater is reduced to 400mg / L, and the terephthalic acid and benzoic acid are reduced to 4.5ppm. After aeration treatment, it can directly enter the next-level bioch...

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Abstract

The process of treating waste water from refined terephthalic acid production belongs to the field of environment protecting engineering and industrial effluent treating technology. The process includes settling and filtering of the waste water, oxidizing degradation in an oxidizing tower with composite catalyst, blowing aeration treatment and the next biochemical treatment. The water solution of ClO2 as the main oxidant has concentration of 0.03 %-5 % and the thrown amount of 5 %-20 % of waste water COD concentration; and the auxiliary oxidant of O2, air and / or H2O2 has the volume ratio to the waste water of 100-110 to 1. The process of the present invention has the features of small covered area, low running cost, low chemical consumption, high treating efficiency, no waste water exhaust, closed water circulation, etc.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and industrial wastewater treatment, and in particular relates to a treatment method for purified terephthalic acid production wastewater. Background technique [0002] PTA (purified terephthalic acid) is an important raw material for the production of synthetic resins, polyester fibers and other products. At present, domestic PTA plants all use p-xylene oxidation process. During the production process, a large amount of high-concentration organic wastewater is produced, and the wastewater composition is complex. The main pollutants include toluene, p-xylene, p-toluic acid, p-aldehydobenzoic acid, terephthalic acid (PTA or TA), phthalic acid, benzoic acid, p-carboxybenzaldehyde, cobalt-manganese catalysts, etc. Ten kinds of organic pollutants, the water quality is complex and changeable, which greatly increases the difficulty of treatment. However, due to the influence of market...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/72
Inventor 张跃严生虎刘建武沈介发马锦国
Owner JIANGSU POLYTECHNIC UNIVERSITY
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