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Process and apparatus for improving the disintegration of thixotropic suspensions by means of ultrasound

A suspension, ultrasonic technology, used in the field of technology

Inactive Publication Date: 2010-09-01
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] But in principle, the problem still exists in the aspect of ultrasonic disintegration of mud is that, on the one hand, the maximization of the disintegration effect to be achieved by the cavitation induced by ultrasonic waves is achieved, and on the other hand, the maximum possible operation of the ultrasonic equipment in continuous operation is ensured. reliability
Correspondingly, the substantially opposing requirements for effectiveness and economy of ultrasonic disintegration plants create limitations that seem insurmountable only by solutions in terms of reactor chamber construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039]Next, the present invention will be described in detail in Examples.

[0040] To improve the anaerobic decomposition process in the fermentation, a split stream of concentrated excess slurry with a solids content of 5.8% was disintegrated prior to fermentation. The throughput through the ultrasonic equipment is 1.2m 3 / h. In the pipe system of the ultrasonic equipment (hydraulic diameter 65mm, flow velocity 0.1m / s), the mud viscosity is 17950mPa.s. Obtain the following primary disintegration effects through ultrasonic disintegration:

[0041] Particle surface area from 0.050m 2 / cm 3 Raised to 0.12m 2 / cm 3 .

[0042] The enzyme activity increased from 0.12μmol / (L·min) to 0.19μmol / (L·min).

[0043] This disintegration result is significantly improved by targeted reduction of the slurry viscosity. In a first treatment step, the structure of the slurry is modified by delivering mechanical energy by means of a shear gap homogenizer in such a way that the viscosity ...

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Abstract

The invention is based on the field of process technology and relates to a process and to an apparatus as can be used, for example, for disintegration of sludges. It is an object of the present invention to specify a process in which the dynamic viscosity of the thixotropic suspensions is lowered before and / or during the ultrasound treatment. The object is achieved by a process in which thixotropic suspensions are subjected to mechanical stress and then sent to an ultrasound treatment, at least one further suspension stream with a higher flow rate being added to the suspension stream before the ultrasound treatment. The object is additionally achieved by an apparatus consisting of a pipeline system with an apparatus part for applying mechanical stress downstream of an ultrasound probe, and orifices being present in the pipeline upstream and downstream of the region with the ultrasound probes, these orifices being connected via a further pipeline.

Description

technical field [0001] The invention relates to the field of process technology and to a method and a device for improving the breakdown of thixotropic suspensions by means of ultrasound, such as can be used, for example, for breaking up excess sludge or sludge containing excess slurry. Background technique [0002] It is known from DE 42 05 739 A1 that the ultrasonic treatment of primary sludge, fermentation sludge and excess sludge from biological clarification plants breaks down the solid components of these biologically produced sludges. Therefore, ultrasonic treatment belongs to the disintegration method in the field of wastewater purification and sludge treatment. During the ultrasonic treatment, a cavitation field is generated in the corresponding sludge by means of ultrasonic oscillators, which leads to a change in the properties of the sludge. [0003] In most cases, slurries and sludges produced by biological processes exist as heterogeneous mixtures of cells, liq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F1/36
CPCC02F1/36C02F1/34C02F2303/06B01J19/10C02F11/00
Inventor 安内洛雷·腓特烈埃伯哈德·腓特烈布格哈特·法萨索尔亚历山大·米夏埃利斯卡琳·约布斯特
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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