High-dryness conditioning and dehydrating method for sludge

A high-dryness, sludge technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of limited magnetization, unstable dewatering effect, and difficulty in magnetization, and achieve uniform distribution, low cost of dewatering agents, and dewatering. high degree of effect

Active Publication Date: 2014-05-07
广州福之源环保科技有限公司
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AI Technical Summary

Problems solved by technology

However, when the concentration of suspended solids in the mixed liquid is high and the particles are large, the magnetization is greatly affected by the particles themselves and the force between them, and it is not easy to be magnetized; the magnetic force is also affected by the magnetic position and the magnetizable properties of the sludge, making the magnetization Limited, there is the disadvantage of unstable dehydration effect

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  • High-dryness conditioning and dehydrating method for sludge

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Effect test

Embodiment 1

[0028] (1) Take 100mL of concentrated activated sludge (water content 97.5%), acidify it with industrial sulfuric acid to pH=5, stir the acidified sludge at a speed of 150rpm, add ferrous sulfate according to 6% of the dry weight of the sludge, and then press Add hydrogen peroxide 800mg / L to the sludge volume meter, and continue to stir and react for 15 minutes;

[0029] (2) Stir the sludge at a speed of 250rpm, add 100mg / L of magnetic powder, continue to stir for 10min, then add 150mg / L of polyferric sulfate, continue to stir for 10min, so that the coagulant and sludge particles are fully mixed;

[0030] (3) Stir the sludge at a speed of 60rpm, add a cationic polyacrylamide (CPAM) aqueous solution with a volume of 1.5v / v% of the sludge (pre-prepared cationic polyacrylamide into a 0.1wt% aqueous solution, and dissolve it for more than 1 hour) , stirred and reacted for 10 minutes, and the conditioning was completed;

[0031] (4) Pour the conditioned sludge evenly into the Buch...

Embodiment 2

[0033] (1) Take 100mL of concentrated activated sludge (water content 96.2%), acidify it with industrial sulfuric acid to pH=5, stir the acidified sludge at a speed of 150rpm, add ferrous sulfate according to 4% of the dry weight of the sludge, and then press Add hydrogen peroxide 600mg / L to the sludge volume meter, and continue to stir and react for 10 minutes;

[0034] (2) Increase the stirring speed to 250rpm, add 50mg / L magnetic powder, continue stirring for 10 minutes, then add 200 mg / L polyferric chloride, continue stirring for 10 minutes, so that the coagulant, magnetic powder and sludge particles are fully mixed;

[0035] (3) Reduce the stirring speed to 60rpm, add a cationic polyacrylamide (CPAM) aqueous solution with a volume of 1v / v% of the sludge (pre-prepared cationic polyacrylamide into a 0.1wt% aqueous solution, and dissolve it for more than 1 hour), and stir the reaction 5min, complete conditioning;

[0036] (4) Pour the conditioned sludge evenly into the Buch...

Embodiment 3

[0038] (1) Take 100mL of concentrated activated sludge (water content 97.3%), acidify it with industrial sulfuric acid to pH=5, stir the acidified sludge at a speed of 150rpm, add ferrous sulfate according to 4% of the dry weight of the sludge, and then press Add 600mg / L of hydrogen peroxide to the sludge volume meter, and continue to stir and react for 20 minutes;

[0039] (2) Increase the stirring speed to 250rpm, add 50mg / L magnetic powder, continue stirring for 10 minutes, then add 200 mg / L polyferric chloride, continue stirring for 10 minutes, so that the coagulant, magnetic powder and sludge particles are fully mixed;

[0040] (3) Reduce the stirring speed to 60rpm, add a cationic polyacrylamide (CPAM) aqueous solution with a volume of 2v / v% of the sludge (pre-prepared cationic polyacrylamide into a 0.1wt% aqueous solution, and dissolve it for more than 1 hour), and stir the reaction 5min, complete conditioning;

[0041] (4) Pour the conditioned sludge evenly into the B...

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Abstract

The invention discloses a high-dryness conditioning and dehydrating method for sludge. A compound conditioning agent is adopted, the strong oxidizing property of an oxidant, the flocculating function and magnetic field force function of magnetic powder and the electrical neutralization of an inorganic flocculating agent are organically combined with the adsorptive bridging function and the macromolecular sweeping and trapping effects of a compression double-electron layer and an organic flocculating agent, and the advantage of each conditioning agent is brought into play in a synergetic manner, so that the sludge structure and property are improved effectively, water in sludge cells and bound water on the surface of an extracelluar polymer are released, the dehydration performance of the sludge is improved remarkably, and high-dryness dehydration is realized. The method has the advantages of high sludge dehydration degree, good flocculating effect, short flocculating and settling time, high volume reduction rate and low dehydration cost.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, in particular to a method for conditioning and dehydrating sludge with high dryness. Background technique [0002] Sludge dewatering is an indispensable link in the process of sludge disposal and resource utilization. However, due to the high water content of sludge and the strong binding force between water and solid colloidal particles in sludge, poor dehydration performance has become a constraint. The key factor for sludge reduction and resource disposal. [0003] Sludge is a floc particle with bacteria as the core, which is connected together through the entanglement and association of extracellular polymers, the adsorption and bridging of inorganic particles, and the electrostatic interaction of anions and cations. The state of water in sludge is mainly: free interstitial water surrounded by particles; capillary water combined with particles due to capillary action between particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 张知隼
Owner 广州福之源环保科技有限公司
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