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Treatment technology for strengthening dehydration performance of printing and dyeing sludge through hydrothermal carbonization

A treatment process, printing and dyeing sludge technology, applied in the field of resources and environment, can solve problems such as Maillard phenomenon, affecting sludge dewatering performance, etc., achieve the effect of low price, low equipment requirements, and reduce moisture content

Inactive Publication Date: 2019-01-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are few domestic studies on sludge hydrothermal lysis modification to promote sludge dehydration. Chinese patent CN103880266A relates to a method and device for hydrothermal sludge dehydration. Wet sludge is dehydrated. The first stage hydrothermal reaction temperature is 220-280°C, and the reaction time is 5-15min. The second stage reaction is 160-200°C, and the reaction time is 20-60min. ~60%, the advantage of the device of this invention is that in the two-stage hydrothermal reaction process, the heat generated by cooling is used to preheat the sludge to realize energy reuse, but due to high temperature and high pressure, there are safety and air pollution In addition, when the temperature exceeds 200 ° C, the Maillard phenomenon is likely to occur, which affects the dewatering performance of the sludge, so it needs to be improved

Method used

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  • Treatment technology for strengthening dehydration performance of printing and dyeing sludge through hydrothermal carbonization
  • Treatment technology for strengthening dehydration performance of printing and dyeing sludge through hydrothermal carbonization
  • Treatment technology for strengthening dehydration performance of printing and dyeing sludge through hydrothermal carbonization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the hydrothermal reactor, the solid content is 17.29%, and the CST, viscosity and SRF are 274s, 2850mPa·s and

[0035] 5.89×10 10 m·kg -1 The printed and dyed sludge was added with ferric sulfate and mixed evenly. The amount of ferric sulfate added was 0.2 based on the weight of solids in the sludge. Stir at 160rpm for 15 minutes, and nitrogen was introduced for 5 minutes to discharge the air. The hydrothermal temperature is controlled at 220°C, 200-240r / min stirring and reacting, after the reaction time is 120min, the activated sludge is discharged from the reactor, and input into a plate and frame filter press (BAMA 0.6 / 315-UBK type) for press filtration, the obtained sludge The moisture content of the mud is 50.4%. CST decreased from 274s to 55s; viscosity decreased from 2850mPa·s to 64mPa·s; SRF5.89×10 10 by m·kg -1 Reduced to 4.12×

[0036] 10 9 m·kg -1 . The dehydration performance is greatly improved.

[0037] The method is the same as above, and the hy...

Embodiment 2

[0039] Same as Example 1, the solid content rate is 15.77%, CST, viscosity and SRF are 60s, 2697mPa·s and 5.59×10 respectively 10 m·kg -1 For the printing and dyeing sludge, ferric sulfate was added. The amount of ferric sulfate was 0.25 based on the weight of solids in the sludge. The hydrothermal temperature was controlled at 210°C. The stirring reaction was uniform. The sludge is discharged from the reaction kettle and input into a plate and frame filter press (BAMA 0.6 / 315-UBK type) for pressure filtration, and the moisture content of the obtained sludge is 55.2%. CST decreased from 260s to 42s; viscosity decreased from 2697mPa·s to 71mPa·s; SRF decreased from 5.59×10 10 m·kg -1 Reduced to 3.51×109m·kg-1.

[0040] The method is the same as above, and the hydrothermal reaction time is changed between 60 and 300 minutes. image 3 and Figure 4 It reflects the change of its basic index with the reaction time. It can be seen that after 120 minutes of hydrothermal reactio...

Embodiment 3

[0042] Same as Example 1, the solid content rate is 16.13%, and the CST, viscosity and SRF are 286s, 2127mPa·s and 5.49×10 respectively 10 m·kg -1 For the printing and dyeing sludge, ferric sulfate was added. The amount of ferric sulfate was 0.5 based on the weight of the solids in the sludge. The mud is discharged from the reaction kettle, and is input into a plate and frame filter press (BAMA 0.6 / 315-UBK type) for pressure filtration, and the moisture content of the obtained sludge is 48.6%. CST decreased from 286s to 37s; viscosity decreased from 2127mPa·s to 31mPa·s; SRF decreased from 5.49×10 10 m·kg -1 Reduced to 1.46×10 9 m·kg -1 . The dehydration performance is greatly improved.

[0043] The method is the same as above, changing the dosage of the agent ferric sulfate, the mass part of the solid in the sludge is 1, and the dosage of the agent is 0, 0.1, 0.2, 0.5, 1.0 respectively. Depend on Figure 5 and Figure 6 It reflects the change of its basic index with ...

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Abstract

The invention discloses a treatment technology for strengthening dehydration performance of printing and dyeing sludge based on hydrothermal carbonization. The treatment technology comprises the following steps: (1) adding ferric sulfate into the printing and dyeing sludge and carrying out hydrothermal reaction for 1 to 5 hours at 180 to 260 DEG C under the relative pressure of 0.6 to 1.7MPa, wherein the adding amount of the ferric sulfate is 0.1 to 1 part by taking the mass part of solids in the printing and dyeing sludge as 1; (2) dehydrating the sludge obtained by step (1). The method disclosed by the invention is used for treating the printing and dyeing sludge; the removal rate of organic matters in the printing and dyeing sludge is high and the dehydration performance of the sludge is better; the moisture content of the printing and dyeing sludge is remarkably reduced; the treatment technology has the advantages of simple technology, low equipment requirements and convenience foroperation and provides an important pre-treatment technology for subsequent treatment and disposal of the printing and dyeing sludge.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and relates to a treatment method for printing and dyeing sludge, in particular to a treatment process for enhancing the dehydration performance of printing and dyeing sludge by hydrothermal carbonization. Background technique [0002] The activated sludge method has economic and technological advantages such as large processing capacity, wide application range, high organic matter removal efficiency, stable operation and low cost, and has always been the mainstream process of sewage treatment. Excess activated sludge is part of the activated sludge that is removed after precipitation in the activated sludge process. A large amount of excess activated sludge is bound to be produced during the process of activated sludge treatment of wastewater; it is reported that the cumulative amount of sludge in the country in 2016 has exceeded 3.2×10 7 tons / year (calculated at 80% moisture ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/122C02F101/30C02F103/30
CPCC02F11/121C02F11/14C02F2101/30C02F2103/30
Inventor 张雪英徐振佳周俊陆宇倩
Owner NANJING UNIV OF TECH
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