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Sludge dewatering concentration and consolidation treatment method

A technology for sewage treatment plant and sludge, which is applied in the direction of dewatering/drying/concentrating sludge treatment, which can solve the problem of high cost of solidified soil treatment

Inactive Publication Date: 2014-03-19
TIANJIN POLYTECHNIC UNIV
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AI Technical Summary

Problems solved by technology

The amount of solidified material accounts for 30-40wt% of the amount of sludge, plus the cost of stirring, transportation, etc., the treatment cost of solidified soil is relatively high

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0011] The modified polysilicate microgel flocculant is prepared by the following method:

[0012] Under high-speed stirring conditions, 400kg of sodium silicate with a silicon dioxide concentration of 5wt% was added to 100ppm of silicon dioxide powder, and vigorously stirred in a drum stirring device to keep the Reynolds number of the liquid during the stirring process at 10000, and then use The dilute sulfuric acid with a concentration of 20wt% by weight was acidified until the pH of the solution was 10, and at the same time, the instant viscosity of the mixed solution was measured as 20mpa·S by an online viscometer, that is, polysilicic acid microgel was prepared.

[0013] Add a certain amount of lime milk to the sludge to be treated, the addition is generally 0.5wt%, and then add the liquid obtained by mixing sodium silicate and sulfuric acid through a high-speed stirrer, the addition is 0.2wt%, after stirring for about 10 minutes, Bubble air or carbon dioxide to lower the...

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Abstract

The invention relates to an environment-friendly and efficient method for dewatering consolidation of sludge in the urban waters and sewage treatment plants, belonging to the technical field of sludge dewatering processes. The method comprises the following steps: adding a certain amount of lime milk into the sludge to be treated, wherein the addition is generally 0.1-1wt%; adding the liquid obtained by mixing sodium silicate and sulfuric acid through a high-speed stirrer, wherein the addition is 0.01-0.5wt%; stirring for about 2-10 minutes, blowing in air or carbon dioxide to reduce the pH value to 7.5-8.5; and putting the slurry into a sedimentation tank or air flotation tank for separation. Through a series of water absorption, hydrolysis and hydration reactions, an irreversible condensation hardened shell is formed, and the sludge particles have certain water stability and strength stability. After that, generally 5-10wt% of the mixture of cement, lime and fly ash is added so that the sludge is internally dense; and after being hardened, the sludge has certain structural strength. Through the water absorption effect of the solidified material after two-step treatment, the moisture content of the sludge can be effectively reduced, and certain 'pollution reduction' and 'strengthening and solidifying' effects are realized.

Description

technical field [0001] The invention relates to an environmentally friendly and efficient dehydration and consolidation method for sludge in urban water areas and sewage treatment plants, and belongs to the technical field of sludge dehydration technology. Background technique [0002] At present, the main method of domestic disposal of dredged silt is to spoil nearby, that is, requisition a piece of land to pile up silt or dig out the channel earthwork and throw it in a temporarily unnavigable river or low-lying area. The land formed by dumping dredged silt is very weak and difficult to develop and utilize, thus causing a lot of waste of land resources. On the other hand, most of the dredged silt contains heavy metals, organic matter and other pollutants, and the nearby dumping will inevitably cause secondary pollution to the surrounding environment, and involve demolition and compensation for agriculture and fishery, which brings great difficulties to the project. The mar...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 郑春明孙晓红陈佩佩朵志福鲍守民张曹进
Owner TIANJIN POLYTECHNIC UNIV
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