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Method for recycling textile wastewater to prepare submicron calcium-based rigid material

A sub-micron textile wastewater technology, applied in textile industrial wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve solid waste TA problems such as poor purity, no reuse value, and poor dehydration

Inactive Publication Date: 2017-09-15
常州市五洲环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Acid analysis is an effective way to remove TA-Na in alkali reduction wastewater, but there are two main problems: (1) The CODcr removal rate of acid analysis wastewater is limited, and the load of subsequent biochemical treatment is still large; ( 2) The solid waste TA recovered by acid analysis has poor purity, small particles, poor dehydration, and no reuse value. Incineration or landfill treatment is also likely to cause secondary pollution

Method used

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  • Method for recycling textile wastewater to prepare submicron calcium-based rigid material
  • Method for recycling textile wastewater to prepare submicron calcium-based rigid material
  • Method for recycling textile wastewater to prepare submicron calcium-based rigid material

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Experimental program
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Effect test

Embodiment 1

[0026] Step 1: Adjust the pH value of the waste water to 10, add basic aluminum chloride, stir at a speed of 400 rpm for 10 minutes, and then slowly stir at a speed of 100 rpm for 20 minutes, filter the suspension through cinders, and filter the filtrate through activated carbon device to obtain clear liquid.

[0027] Step 2: add sulfuric acid to the clear liquid, adjust the pH to 3.5, precipitate terephthalic acid (TA), and obtain TA emulsion;

[0028] Step 3: TA emulsion and calcium hydroxide slurry are reacted in an ultrasonically enhanced tubular reactor, and the output is separated from solid and liquid. After drying at 150°C, the filter cake can be used as a functional additive for rubber and plastic materials, and the filtrate is discharged. Enter the biochemical treatment system, and discharge or reuse after further treatment reaches the standard.

[0029] The molar ratio of TA to calcium hydroxide is 1:1.

[0030] The applied frequency of the ultrasonic wave is 55KH...

Embodiment 2

[0034] The difference between embodiment 2 and embodiment 1 is:

[0035] In step 1, adjust the pH value of the wastewater to 11, add basic aluminum chloride, stir at 800 rpm for 3 minutes, and then slowly stir at 300 rpm for 10 minutes.

[0036] In step 2, sulfuric acid was added to the clear liquid to adjust the pH to 4.2.

[0037] The molar ratio of TA to calcium hydroxide is 1:1.1.

[0038] The ultrasonic wave is applied at a frequency of 75KHz and a power of 600W.

[0039] The CODcr detection of the effluent filtrate of step 3 was carried out by the method of test 1, and the results are shown in Table 1.

Embodiment 3

[0041] The difference between embodiment 3 and embodiment 1 is:

[0042] In step 1, adjust the pH value of the waste water to 10.5, add basic aluminum chloride, stir at a speed of 600 rpm for 7 minutes, and then slowly stir at a speed of 200 rpm for 15 minutes.

[0043] In step 2, sulfuric acid was added to the clear liquid to adjust the pH to 4.0.

[0044] The molar ratio of TA to calcium hydroxide is 1:1.05.

[0045] The applied frequency of the ultrasonic wave is 65KHz, and the power is 500W.

[0046] The CODcr detection of the effluent filtrate of step 3 was carried out by the method of test 1, and the results are shown in Table 1.

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Abstract

The invention discloses a method for recycling textile wastewater to prepare a submicron calcium-based rigid material. The method comprises the following steps: 1, purifying the textile wastewater through flocculation impurity removal and active carbon filtration technologies to obtain a clear liquid; 2, adding sulfuric acid to the clear liquid, and adjusting the ph value to 3.5-4.2 to precipitate terephthalic acid (TA) in order to a TA emulsion; and 3, carrying out a reaction on the TA emulsion and a calcium hydroxide slurry in an ultrasonic enhanced tubular reactor, carrying out solid-liquid separation on a material discharged from the reactor, drying the obtained filter cake to obtain a dried filter cake which can be used as a functional assistant of a rubber material, allowing the obtained outlet water filtrate to enter a biochemical treatment system, and further treating the obtained water to obtain water reaching standards, which is discharged or reused then. The method reduces the CODcr value of the textile wastewater outlet water by 82% or above, and increases the biodegradability; ad the crystallized and precipitated submicron calcium-based rigid material can be used in high-molecular polymers, and has excellent processing performances and comprehensive mechanical performances.

Description

technical field [0001] The invention relates to a technology for recycling industrial wastewater, in particular to a method for converting high-concentration organic matter in textile wastewater into submicron calcium-based rigid materials to realize recycling of textile wastewater. Background technique [0002] With the rapid development of my country's polyester chemical fiber industry, alkali weight reduction technology has been widely used in the production of imitation silk, ultra-fine synthetic leather and other products. Polyester fiber (PET) has no obvious chemical effect in dilute NaOH solution at low temperature, but at high concentration NaOH solution and higher temperature, PET and NaOH undergo hydrolysis reaction to form sodium terephthalate (TA-Na) and ethylene glycol (EG) to make PET weight loss, hydrolysis loss is generally 3.5% to 30%, that is, 3.5% to 30% of PET exists in alkaline water. The PET dissolved and stripped from the polyester fabric enters the w...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/30
CPCC02F9/00C02F1/00C02F1/001C02F1/66C02F2001/5218C02F2103/30C02F2301/08
Inventor 张莉娜方春平蒋丽陈文彦
Owner 常州市五洲环保科技有限公司
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