Electro-osmotic dewatering technology for biological sludge

A technology of biological sludge and electroosmosis, which is applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of high moisture content of biological sludge, difficult removal of bound water, complex removal process, etc., to reduce the moisture content , Ease of modification and cost reduction

Inactive Publication Date: 2015-11-04
霍普科技(天津)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a convenient and practical electroosmotic dehydration process for biological sludge in order to solv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The biological sludge left over from the biologically treated domestic sewage in the sewage treatment plant, with a water content of 99%, is transported to the filter press dehydration pool through a screw pump, and the filter cloth is firstly paved with 10cm of diatomite, and the water content is 79% after 15min of press filtration. % of the concentrated sludge, the concentrated sludge is transported to the electroosmotic dehydration pretreatment tank through the screw pump, and the sophorolipid is added, and the amount added is 0.5% of the concentrated sludge amount, and mechanically stirred at a stirring speed of 1000r / min, the stirring time is 30min, and the pretreated sludge enters the electroosmotic dehydration equipment. The electroosmotic dehydration equipment adopts the combination of electroosmotic dehydration and mechanical dehydration. The electroosmotic dehydration electrodes are alternately powered by DC and AC. The dehydration time is 50 minutes. The mois...

Embodiment 2

[0028] The biological sludge left over from the biologically treated domestic sewage in the sewage treatment plant, with a water content of 99%, is transported to the filter press dehydration pool through a screw pump, and the filter cloth is firstly paved with 10cm of diatomite, and the water content is 79% after 15min of press filtration. % of the concentrated sludge, the concentrated sludge is transported to the electroosmotic dehydration pretreatment tank through a screw pump, and polyacrylamide is added in an amount of 2.5% of the concentrated sludge, and mechanically stirred at a stirring speed of 1000r / min, the stirring time is 30min, and the pretreated sludge enters the electroosmotic dehydration equipment. The electroosmotic dehydration equipment adopts the combination of electroosmotic dehydration and mechanical dehydration. The electroosmotic dehydration electrodes are alternately powered by DC and AC. The dehydration time is 30 minutes. The moisture content of the ...

Embodiment 3

[0030] The biological sludge left over from the biologically treated domestic sewage in the sewage treatment plant, with a water content of 99%, is transported to the filter press dehydration pool through a screw pump, and the filter cloth is firstly paved with 10cm of diatomite, and the water content is 79% after 15min of press filtration. % concentrated sludge, the concentrated sludge is transported to the electroosmotic dehydration pretreatment tank through a screw pump, and polyacrylamide and sophorolipid compound are added, and the compounding ratio is 5:1. The amount added is the concentrated sludge amount 1%, mechanically stirred, the stirring speed is 1000r / min, the stirring time is 30min, and the pretreated sludge enters the electroosmotic dehydration equipment. The electroosmotic dehydration equipment adopts the combination of electroosmotic dehydration and mechanical dehydration. The electroosmotic dehydration electrodes are alternately powered by DC and AC. The dehy...

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Abstract

The invention relates to an electro-osmotic dewatering technology for biological sludge, which comprises the following steps: 1)mechanical dewatering treatment; 2) electro-osmotic dewatering pretreatment; 3)electro-osmotic dewatering treatment; 4)dewatering filtrate recovery; and 5) dewatering filter cake collection. The water content of the dewatering filter cake obtained in the above steps is less than 55%. The method has the beneficial effect that the dewatering technology employs a surfactant and a flocculating agent for complex formulation, water content of the dewatered sludge is reduced, and sludge dewatering rate is increased. According to the invention, a mechanical dewatering step is carried out so that free water and interstitial water in sludge can be removed, the water content is reduced to 75-80%, then an electro-osmotic dewatering step is carried out, so that electro-osmotic dewatering time is saved, service life of an electrode is increased, and loss can be reduced.

Description

technical field [0001] The invention relates to a sludge dewatering process, in particular to an electroosmotic dehydration process of biological sludge, and belongs to the technical field of sewage discharge and sludge treatment. Background technique [0002] Sludge, as a solid pollutant produced by urban sewage treatment plants, is an extremely complex heterogeneous body composed of organic matter, inorganic salts, microorganisms, and parasite eggs. Most urban sewage treatment plants use activated sludge process to treat sewage. Due to the need for the replacement of microorganisms in activated sludge, excess sludge is inevitably generated in the process of sewage treatment. The main characteristics of sludge are high water content, some even as high as 99%, high organic matter content, easy to rot and smell, and fine particles and small specific gravity. Since the sludge contains various pollutants, if it is directly put into the environment without harmless treatment a...

Claims

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Application Information

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IPC IPC(8): C02F11/12
Inventor 孙浩
Owner 霍普科技(天津)股份有限公司
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