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Method for treatment of coked sludge through ultrasound and modified cyclodextrin

A synergistic modification and cyclodextrin technology, applied in chemical instruments and methods, fixed/solidified sludge treatment, sludge detoxification, etc., can solve the problem of loss of cross-linked β-cyclodextrin and HDI-β-CD quality loss and other issues, to achieve the effect of shortened processing time, high utilization efficiency, and comprehensive effects

Inactive Publication Date: 2016-03-30
NANJING POLYTECHNIC INSITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Regarding the application of modified cyclodextrins in the field of environmental protection, Zhou Yuqing et al. in "Treatment of Phenol Wastewater with New Cross-Linked β-Cyclodextrins" (Chemical Reaction Engineering and Technology, 2011, 27(5): 477-480) It is mentioned in the article that the regenerative adsorption rate of cross-linked cyclodextrin reaches more than 88%. This regenerative adsorption is under the condition of continuously replenishing the loss. The article does not mention the loss of cross-linked β-cyclodextrin during the adsorption and regeneration process, and how to deal with this loss
Wang Haijun and others found that the adsorption performance of HDI-β-CD can be regenerated and repeated The adsorption rate is still 58.1% after 10 regenerations, but there is no mention of the mass loss of HDI-β-CD during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example is carried out under laboratory conditions. A certain amount of coking sludge is placed in a jar, and then the self-made modified cyclodextrin wrapped in a filter is added, and then the jar is placed in a jar with an ultrasonic generator. Carry out harmless treatment in the container; set the frequency and sound intensity of the ultrasonic generator, use a timer, and take a small amount of coking sludge samples after a certain period of time. The concentration of the supernatant is determined by chromatography, and the filter membrane used for analysis is not larger than 500 mesh; during the sampling process, because the adsorption of the modified cyclodextrin will reach an equilibrium state, the adsorption equilibrium time is 20-3600min, so the sampling interval should not exceed 20min. should

[0032] In this example, coking sludge with a concentration of 15000 mg / L was placed in a jar, and 5000 g / L of sludge was added with self-made modified cyclodextrin...

Embodiment 2

[0034] In this embodiment, ultrasound is used as an auxiliary means and modified cyclodextrin is used to harmlessly treat coking sludge organic matter with a concentration of 10000 mg / L.

[0035] Put the coking sludge with a concentration of 10000mg / L in a jar, add self-made modified cyclodextrin according to 1000g / L sludge, the frequency of the ultrasonic generator is 70kHz, and the sound intensity is 8W / cm 2 After an interval of 40 minutes, samples of coking sludge were taken, centrifuged, filtered through a 50-mesh filter membrane, and the concentration of the supernatant liquid after separation was measured by gas chromatography. After 360 hours, the coking sludge sample was taken, and the odor was reduced from grade 4 to grade 1, and the chromaticity was reduced from 420 degrees to 30 degrees.

Embodiment 3

[0037] In this embodiment, ultrasound is used as an auxiliary means and modified cyclodextrin is used to harmlessly treat coking sludge organic matters with a concentration of 5000 mg / L.

[0038] Put the coking sludge with a concentration of 5000mg / L in a jar, add self-made modified cyclodextrin at 500g / L sludge, the frequency of the ultrasonic generator is 50kHz, and the sound intensity is 50W / cm 2 After an interval of 20 minutes, samples of coking sludge were taken, centrifuged, filtered with a 70-mesh filter membrane, and the concentration of the supernatant liquid after separation was measured by gas chromatography. After 320 hours, the coking sludge sample was taken, and the odor was reduced from level 4 to level 1, and the chromaticity was reduced from 380 degrees to 18 degrees.

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Abstract

The invention discloses a method for treatment of coked sludge through ultrasound and modified cyclodextrin. A modified cyclodextrin polymer with regular morphology is wrapped with a filter net and put in to-be-treated coked sludge, the coked sludge is put in an ultrasonic generator, the frequency and the sound intensity of the ultrasonic generator are adjusted, and time for harmless treatment on the coked sludge is set for the ultrasonic generator. The method is applicable to treatment of harmful ingredients of the coked sludge, ultrasound is used as an supplementary means for the coked sludge, the adsorption rate is increased, and the treatment capability of modified cyclodextrin is improved; the speed for treating the coked sludge through modified cyclodextrin is increased; the odor of the coked sludge can be comprehensively reduced, and the chromaticity of the coked sludge can be comprehensively improved; used modified cyclodextrin has a regeneration function and a good industrial application prospect and is high in utilization efficiency and low in cost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a coking sludge treatment technology, in particular to a method for synergistically treating coking sludge using ultrasound and modified cyclodextrin, which is a new method for harmless treatment of coking sludge. Background technique [0002] Sludge treatment refers to the whole process of sludge reduction, stabilization and harmlessness through unit process combination treatment. The requirement for sludge stabilization treatment is that the final disposal is harmless to the environment, and the treated sludge is disposed of in the natural environment (ground, underground, water) or reused, and can achieve long-term stability without adverse effects on the ecological environment. [0003] After the sludge is finally treated, if it is simply landfilled without any utilization, it will consume land resources and cannot generate added value, which is a backward meth...

Claims

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Application Information

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IPC IPC(8): C02F11/00
CPCC02F11/004C02F11/008C02F2303/02C02F2303/06
Inventor 周玉青李强许宁李玉龙
Owner NANJING POLYTECHNIC INSITUTE
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