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New ultrasound-assisted sludge dewatering system

A sludge dewatering and ultrasonic technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of difficult sludge dehydration, low efficiency, high cost, etc.

Inactive Publication Date: 2011-07-13
TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new type of ultrasonic-assisted sludge dewatering method that is economical and efficient for the problems of difficult sludge dewatering, high cost, and low efficiency.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] The remaining sludge of a sewage treatment plant in Tianjin has a water content of 98.1%. The sludge is transported to the sealed pipeline by a mud pump with a flow rate of 200m 3 / h, use a metering pump to add a cationic polyacrylamide flocculant solution with a concentration of 5‰ (weight ratio) to the mixture, the ultrasonic generating device will not start, that is, no ultrasonic action will be applied, and the geotechnical tube bag will be dehydrated and consolidated for 10 days after it is filled. , The average moisture content of the sludge is 56%.

Embodiment 2

[0021] The dosage of flocculant is changed to 4‰ (weight ratio), and the ultrasonic generator is turned on. After the sludge is added with flocculant, the frequency is 20kHz and the sound intensity is 400W / m 3 , the ultrasonic action of sound energy density 0.3W / ml, other conditions are the same as embodiment 1, geotechnical tube bag is dewatered and consolidated for 10 days, and the moisture content of sludge is 48%. The reduction without sonication was 8%.

Embodiment 3

[0023] The amount of flocculant dosage and ultrasonic conditions are the same as in Example 2, and the dehydration and consolidation time of the geotube bag is changed to 7 days, the moisture content of the sludge is 53%, the consolidation time is reduced by three days, and the amount of flocculant used is reduced by 1‰ , the moisture content was reduced by 3% compared with that without ultrasonic treatment.

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Abstract

The invention relates to a new ultrasound-assisted sludge dewatering system. The system comprises the following use steps: sludge is conveyed by a mud pump to a mixer connected with a sealed pipe, or the bottom sediment of a river course or lake reservoir is conveyed by an environmentally friendly dredging ship to a mixer connected with a sealed pipe, flocculant is added in the mixer through a metering pump, ultrasonic treatment is performed to the sludge with the flocculant and then sent to a geotech-Bag to dewater and solidify. The frequency of the ultrasonic treatment unit is 20kHz-41kHz, the energy density of sound is 0.15W / ml-0.50W / ml, and the ultrasonic treatment is performed for 10s-60s when the sound intensity is 400W / m<2>-600W / m<2>. In the pipeline transport process of sludge, the ultrasonic treatment unit is added in the system of the invention, thus the flocculation effect can be promoted, the dosage of the flocculant can be reduced and the dewatering and solidifying time of the geotech-Bag can be reduced. The new ultrasound-assisted sludge dewatering system can realize continuous operation, have high treatment capacity and efficiency and achieve high economic benefit.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method for dehydrating and reducing the volume of sludge by combining ultrasonic waves with flocculants and geotechnical tube bags. Background technique [0002] With the rapid development of my country's economy and the emphasis on environmental protection, the number of sewage treatment plants and sewage treatment stations is increasing year by year, and the amount of sludge produced is also increasing day by day. In addition to the remaining sediment of sewage treatment plants, the contaminated sediment of rivers, lakes and reservoirs polluted by industrial wastewater is one of the reasons for the continuous pollution of water bodies. Sludge has a high water content, is perishable, has complex components, and contains toxic, harmful, and refractory organic matter and heavy metals. Traditional sludge disposal methods such as landfill, sea discharge, incin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14
Inventor 张景辉刘朝辉卢丹王文茜韩嵩邵兆俊西伟力王旭东董晶毕涛
Owner TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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