Processing system and method for printing and dyeing wastewater

A technology for printing and dyeing wastewater and treatment methods, which is applied in textile industry wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., and can solve problems such as high-power heaters that cannot be realized

Inactive Publication Date: 2008-10-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make the reaction process reach the supercritical state, the mixed solution must be heated to 380-700°C. For the case of large processing capacity, this will require a very powerful heater, which is almost impossible to achieve in practice.

Method used

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  • Processing system and method for printing and dyeing wastewater
  • Processing system and method for printing and dyeing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a treatment system for printing and dyeing wastewater includes a high-pressure plunger pump 1, a delivery pipeline 14, a reactor 4 and a first gas-liquid separator 7, and a high-pressure plunger pump 1, a reactor 4 and a first gas-liquid separator 7 are sequentially connected through the delivery pipeline 14, the high-pressure storage tank is connected between the high-pressure plunger pump 1 and the reactor 4 through the delivery pipeline, and a valve 15 is arranged on the pipeline 14 between the high-pressure storage tank 3 and the reactor 4, and the high-pressure storage tank The tank 3 is also provided with a heater 31 . The reactor 4 adopts a tubular reactor, because the reactor has a certain length, and the mixed liquid flows in it, resulting in a certain residence time.

[0035] A high-pressure hydrocyclone 5 and a first heat exchanger 6 are connected between the reactor 4 and the first gas-liquid separator 7, the input port 51 of the ...

Embodiment 2

[0037] Such as figure 2 As shown, this embodiment is basically the same as the previous example, the difference is:

[0038]The second heat exchanger 2 is arranged between the high-pressure plunger pump 1 and the high-pressure storage tank 3, the high-pressure plunger pump 1 is connected to the first input port 21 of the second heat exchanger, and the first output port 22 of the second heat exchanger Connect the input port of high-pressure storage tank 3 through delivery pipeline 14; The input port 91 of the third heat exchanger 9 and the output port 92 of the third heat exchanger are connected to the input port of the second gas-liquid separator 8 .

[0039] The setting of the second heat exchanger 2 can enable heat exchange between the output liquid treated by the reactor 4 and the waste water mixed liquid output by the high-pressure plunger pump, preheat the waste water mixed liquid, and save the time required for heating the waste water mixed liquid to a supercritical st...

Embodiment 3

[0058] A treatment method for printing and dyeing wastewater, comprising the following steps:

[0059] (1) According to the ratio of adding NaClO511.8g per liter of printing and dyeing wastewater, the wastewater and NaClO are respectively injected into the high-pressure storage tank through a high-pressure plunger pump, and then fully mixed;

[0060] (2) Make the above-mentioned mixed liquid be filled in the high-pressure storage tank, close the high-pressure plunger pump, close the valve between the high-pressure storage tank and the reactor; statically heat the mixed liquid in the high-pressure storage tank with a heater;

[0061] (3) When the pressure in the high-pressure storage tank reaches 25Mpa and the temperature reaches 600°C, open the valve between the high-pressure storage tank and the reactor, and start the high-pressure plunger pump at the same time;

[0062] (4) The high-pressure plunger pump pressurizes the above-mentioned mixed solution to 25Mpa, injects it int...

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Abstract

The invention relates to a treatment system and a method for dyeing wastewater, which aims to solve the problem of difficult high concentration refractory dyeing and desizing wastewater treatment, and provides the system and the method for treating volumes of high concentration dyeing and desizing waste water by adopting the supercritical water oxidation technique. The treatment system has the technical proposals for realizing the invention that: the dyeing wastewater treatment system comprises a high pressure plunger pump, a feeding pipeline, a reactor and a first gas-liquid separator, the high pressure plunger pump, the reactor and the first gas-liquid separator are connected with one another sequentially through the feeding pipeline, and the system is characterized in that the treatment system is also provided with a high pressure storage tank, the high pressure storage tank is connected between the high pressure plunger pump and the reactor through the feeding pipeline, a valve is arranged on the pipeline between the high pressure storage tank and the reactor, and the high pressure storage tank is also equipped with a heater.

Description

technical field [0001] The invention relates to a treatment system and method for waste water produced in the printing and dyeing process, more specifically to a treatment system and method for high-concentration desizing waste water. Background technique [0002] The printing and dyeing industry is a major water user. my country's textile industry ranks sixth in water use among all industries. The printing and dyeing water in the textile industry accounts for 80%, while the recycling rate of printing and dyeing water is only 7% (mainly cooling water), and the recycling rate of the entire textile industry is less than 10%. %, which is the industry with the lowest water reuse rate among all industries in the country. Therefore, saving water resources and improving the reuse rate of water are very important and arduous tasks in the textile and printing and dyeing industries. [0003] The printing and dyeing process includes pretreatment, including cotton fabric scouring, desiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F103/30
Inventor 廖传华朱跃钊朱廷风
Owner NANJING UNIV OF TECH
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