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Ultrasonic combined with modified eggshell method to crack excess sludge

A technology of excess sludge and ultrasonic wave, applied in the direction of dewatering/drying/concentrating sludge treatment, can solve the problems of high operating cost and long cracking time, and achieve the effect of saving the cost of chemicals, reducing the cracking time and reducing environmental pollution.

Inactive Publication Date: 2017-12-19
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above cracking technologies for excess sludge all have good results, and the dehydration performance of the excess sludge after cracking is significantly improved. However, the operating costs of these technologies are generally high, the cracking time is long, and the sludge after cracking will still be more or less Or less with a certain odor, and the moisture content is always above 60%

Method used

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  • Ultrasonic combined with modified eggshell method to crack excess sludge
  • Ultrasonic combined with modified eggshell method to crack excess sludge
  • Ultrasonic combined with modified eggshell method to crack excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Sampling of egg shells and excess sludge:

[0027] The eggshells are taken from the dining garbage in the student canteen, and the remaining sludge is taken from the sludge in the secondary sedimentation tank of the sewage treatment plant. The eggshells are cleaned with deionized water to clean the surface. Store at a constant temperature of 4°C until use.

[0028] (2) Preparation of modified eggshell cracking agent:

[0029] Wash the eggshell with deionized water to remove the dirt on the surface, dry it at 100°C, and then use a pulverizer to crush the dried eggshell and pass it through a 1mm sieve; soak the eggshell powder in 4mol / L potassium hydroxide In the solution for 0.5h, filter to remove water, roast at 700°C for 1 hour, and then pulverize to obtain powder A, soak powder A in 2.5mol / L sulfuric acid solution for 0.5h; centrifuge to remove the upper layer, collect the lower layer of solids and wash with water , and then calcining the washed solid at 700°C f...

Embodiment 2

[0047] (1) Sampling of eggshells and excess sludge is the same as in Example 1.

[0048] (2) Preparation of modified eggshell cracking agent:

[0049] Wash the eggshell with deionized water to remove the dirt on the surface, dry it at 100°C, and then use a pulverizer to crush the dried eggshell and pass it through a 1.25mm sieve; soak the eggshell powder in 4mol / L hydroxide Potassium solution for 1 hour, filtered to remove moisture, roasted at 750°C for 2 hours, and then pulverized to obtain powder A. Soak powder A in 2.5mol / L sulfuric acid solution for 1 hour; centrifuge to remove the upper layer, collect the lower layer of solids and wash with water. Then the washed solid was calcined at 750°C for 2 hours, cooled, ground into a powder with a particle size below 2mm, and set aside;

[0050] (3) cracking reaction:

[0051] According to adding 0.1g of modified eggshells per milliliter of excess sludge, take 20mL of excess sludge, add modified eggshells to it, put it in a 50mL...

Embodiment 3

[0057] (1) Sampling of eggshells and excess sludge is the same as in Example 1.

[0058] (2) Preparation of modified eggshell cracking agent:

[0059] Wash the eggshells with deionized water to remove the dirt on the surface, dry them at 100°C, then crush the dried eggshells with a pulverizer and pass through a 1.43mm sieve; soak the eggshell powder in 4mol / L hydroxide Potassium solution for 1.5h, filtered to remove moisture, roasted at 800°C for 3 hours, and then pulverized to obtain powder A. Soak powder A in 2.5mol / L sulfuric acid solution for 1.5h; centrifuge to remove the upper layer, collect the lower layer of solid Washing with water, then calcining the washed solid at 800°C for 3 hours, cooling, grinding into a powder with a particle size below 2mm, and setting aside;

[0060] (3) cracking reaction:

[0061] According to adding 0.2g of modified eggshells per milliliter of excess sludge, take 20mL of excess sludge, add modified eggshells to it, put it into a 50mL reac...

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Abstract

The invention relates to a method for disintegrating excess sludge through combination of ultrasonic waves and modified eggshells. The method comprises steps as follows: firstly, in terms of 0.05-0.4 g of modified eggshells added to the excess sludge per ml, the modified eggshells are added to the excess sludge, the modified eggshells and the excess sludge are mixed uniformly, and sludge slurry is prepared; the sludge slurry is subjected to ultrasonic treatment through the ultrasonic waves, and the excess sludge is disintegrated. With the adoption of the modified eggshells, the waste eggshells are changed to be wealthy, the environmental pollution is reduced, the problem about disposal and treatment of the eggshells is solved effectively, further, an effective chemical for disintegrating the excess sludge is obtained, the chemical cost for sludge treatment is saved, and the treatment cost of the excess sludge is reduced; with the introduction of the ultrasonic waves in a disintegrating experiment, the sludge cell disintegrating speed is increased greatly, the disintegrating time of the excess sludge is shortened effectively, the treatment efficiency is improved, besides, the disintegrating effect of the excess sludge is remarkable, the settling property is improved perfectly, and the disintegrated sludge is free of foul smell.

Description

【Technical field】 [0001] The invention belongs to the field of sludge treatment and relates to a method for cracking excess sludge by combining ultrasonic waves with modified eggshells. 【Background technique】 [0002] Excess sludge is a kind of flocculent mud particles with high water content (≥97%) produced in the sewage treatment process, which is actually composed of suspended solids, microorganisms, adsorbed organic matter and microbial metabolic activities in sewage. The disposal of the formed aggregates has always been a worldwide problem, and improper disposal can easily cause secondary pollution to the environment. The aggregate particles are small, complex in structure, large in specific surface area, and contain a large amount of EPS (extracellular polymer), and EPS is mainly composed of protein, polysaccharide, and a small amount of DNA, all of which are highly hydrophilic substances. There are also a large number of capillaries and small gaps that can wrap a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12
Inventor 相玉琳王立鹏李越焦玉荣熊姣王若恺
Owner YULIN UNIV
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