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Sludge dewatering treatment method

A technology of sludge dewatering and treatment method, applied in the direction of dewatering/drying/concentrating sludge treatment, can solve the problems of high water content and decrease, and achieve the effect of increasing the dehydration rate

Inactive Publication Date: 2014-08-20
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water content of the sludge treated by this method is still above 70%, which is still relatively high, and there is room for further reduction.

Method used

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  • Sludge dewatering treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: Take the sludge at the bottom of the sedimentation tank in the seawater circulating water fish farming system, add water to reconcile the sludge water with a water content of 90%. Measured by sludge water, add 1500 mg / L of cationic surfactant, cetyltrimethylammonium bromide, and stir for 5 minutes. Then add 5000 mg / L ferric chloride and stir for 5 minutes; then add 250 mg / L polyacrylamide and stir for 10 minutes. Put the sludge water into the agitator, which is a cylindrical utensil made of plexiglass, and the agitator can be connected to a regulated DC power supply for electrochemical treatment. Stirrer with Ir / RuO 2 The electrode plate is the anode, Ti / RuO 2 The mesh pole plate is the cathode, and the pole plate distance between the cathode and the anode is 4cm. During the electrochemical treatment, the voltage was 28V, and the electrochemical reaction took 20 minutes. Put the treated sludge water into a centrifugal dehydrator to concentrate, remove ...

Embodiment 2

[0024] Embodiment 2: Take the sludge at the bottom of the sedimentation tank in the seawater circulating water fish farming system, add water to reconcile into sludge water with a water content of 95%. Measured by sludge water, add cationic surfactant, 2000 mg / L of dodecyl dimethyl benzyl ammonium chloride, and stir for 8 minutes. Then add ferric chloride 6500 mg / L and stir for 8 minutes; then add polyacrylamide 325 mg / L and stir for 7 minutes. Put the sludge water into the agitator, which is a cylindrical utensil made of plexiglass, and the agitator can be connected to a regulated DC power supply for electrochemical treatment. Stirrer with Ir / RuO 2 The electrode plate is the anode, Ti / RuO 2 The mesh pole plate is the cathode, and the pole plate distance between the cathode and the anode is 4cm. During the electrochemical treatment, the voltage was 29V, and the electrochemical reaction took 25 minutes. Put the treated sludge water into a centrifugal dehydrator to concentra...

Embodiment 3

[0025] Embodiment 3: take the sludge at the bottom of the sedimentation tank in the seawater circulating water fish farming system, add water to reconcile into sludge water with a water content of 98%. Measured by sludge water, add 2500 mg / L of cationic surfactant, cetyltrimethylammonium bromide, and stir for 10 minutes. Then add 8000 mg / L ferric chloride and stir for 10 minutes; then add 400 mg / L polyacrylamide and stir for 5 minutes. Put the sludge water into the agitator, which is a cylindrical utensil made of plexiglass, and the agitator can be connected to a regulated DC power supply for electrochemical treatment. Stirrer with Ir / RuO 2 The electrode plate is the anode, Ti / RuO 2 The mesh pole plate is the cathode, and the pole plate distance between the cathode and the anode is 4cm. During the electrochemical treatment, the voltage was 30V, and the electrochemical reaction was performed for 30 minutes. Put the treated sludge water into a centrifugal dehydrator to conce...

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Abstract

The invention discloses a sludge dewatering treatment method. The method is as below: adding a cationic surfactant cetyl trimethyl ammonium bromide or dodecyl dimethyl benzyl ammonium chloride into sludge water, and mixing evenly with a flocculant, then adding the sludge water in a blender, conducting electrochemical treatment by using Ir / RuO2 electrode as the anode and Ti / RuO2 mesh electrode as the cathode, and centrifuging for dewatering. According to the invention, the cationic surfactant and flocculant are added, and electrochemical treatment is combined for conditioning sludge dewatering performance and greatly increasing the sludge dewatering rate.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge dehydration treatment method. Background technique [0002] In the sludge treatment process, sludge dewatering has become a very important link. The moisture content of sludge is generally high, and the dehydration performance is poor, so it is difficult to process and recycle. The ultimate goal of sludge dewatering is to dehydrate sludge in a low-cost and environmentally friendly way to obtain a filter cake with high solid content and reduce disposal costs. [0003] The moisture contained in sludge can be divided into four types: surface adsorption water, interstitial water, capillary bound water and internal bound water. Since the sludge is composed of flocculent colloids, when an external force is applied, the colloidal fine particles will be blocked to form a filter bridge, which increases the specific resistance of the filter. Conventional mechanical dewatering is...

Claims

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Application Information

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IPC IPC(8): C02F11/12C02F11/14
Inventor 孙静亚孙会玲
Owner ZHEJIANG OCEAN UNIV
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