A kind of sludge drying conditioner and preparation method thereof

A technology of sludge drying and conditioning agent, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of poor effluent quality, high cost, poor solubility, etc., to improve efficiency , Increase the adsorption site, enhance the effect of adsorption performance

Active Publication Date: 2022-02-22
ZHEJIANG TAOHUAYUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As one of the widely used conditioner components, polyacrylamide reduces the zeta potential of colloidal particles through charge neutralization to destabilize them, plays the role of adsorption and bridging, promotes sludge flocculation, and facilitates sludge filtration and dehydration. However, it has the disadvantages of high cost, poor solubility, and poor effluent quality. Therefore, it is urgent to find a cation with high relative molecular weight, high ductility, good flocculation and sedimentation performance, good solubility, stable hydrolysis, and low cost. polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A sludge drying conditioner obtained by hydrothermal reaction of a physical conditioner, polyquaternium salt and attapulgite; the mass ratio of the physical conditioner, polyquaternium salt and attapulgite is 2:0.6-0.8 : 1~1.5; Wherein, physical conditioning agent adopts as modified furfural slag; Polyquaternium salt is polyquaternium salt-7 [P (DM-AM)], and it is the natural polymer quaternization by modification or Polymers synthesized by homopolymerization or copolymerization of cationic monomers. The modified furfural slag is obtained by modifying furfural slag through hydrothermal reaction. Furfural slag refers to the waste left after furfural is extracted from biomass materials such as corncobs, straw or rice husks. It is rich in cellulose, hemicellulose and lignin, and is acidic.

[0028] Furfural slag will be partially carbonized during the hydrothermal reaction process, and the internal porous block carbon network and spherical hydrophobic carbon skeleton stru...

Embodiment 2

[0032] A preparation method of sludge drying conditioner, the specific steps are as follows:

[0033] Step 1. Wash the furfural slag with clear water to remove chloride ions in the furfural slag.

[0034] Step 2. Put the cleaned furfural slag in a crusher for crushing, then add the furfural slag, boric acid and water to the polytetrafluoroethylene lining in a mass ratio of 0.5-1:0.7-1.2:2 In the still, carry out hydrothermal reaction at 220°C for 8 hours to obtain modified furfural slag.

[0035] Step 3. Add polyquaternium-7[P(DM-AM)] and attapulgite to the reaction kettle, carry out hydrothermal reaction at 120°C, and react for 1h, wherein modified furfural slag, poly The mass ratio of quaternary ammonium salt-7[P(DM-AM)] to attapulgite is 2:0.6~0.8:1~1.5.

[0036] Step 4. Place the hydrothermally reacted mixture in the reactor in an oven at 60°C for drying, then transfer the dried mixture to a grinder for grinding, and pass through a 60-mesh sieve to obtain a sludge drying...

Embodiment 3

[0043] The mass ratio of modified furfural slag, polyquaternium salt and attapulgite as the raw material of sludge drying conditioner is 2:0.7:1.3. Use the sludge drying conditioner to carry out the sludge conditioning test, as follows:

[0044] The sludge with a moisture content of 95% is conditioned by using a sludge drying conditioner. The addition of the conditioner is 4% (mass) of the dry weight of the sludge. After the sludge and the conditioner are stirred evenly, they are fully reacted for 1 hour, and then the reaction The final sludge solution is precipitated to realize the separation of mud and water. Finally, the separated sludge is put into a plate and frame filter press for pressing and dehydration, and finally a mud cake is formed. The dehydration pressure is 1 MPa, and the pressing and dehydration time is 1 to 2 hours.

[0045] Take 100g of the obtained mud cake to measure the water content and dry weight. The water content after sludge dehydration is 50% to 55%...

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Abstract

The invention discloses a sludge drying conditioner and a preparation method thereof. The sludge drying conditioner is obtained by hydrothermal reaction of modified furfural slag, polyquaternium salt and attapulgite; the modified furfural slag is obtained by modifying furfural slag through hydrothermal reaction. The sludge drying conditioner provided by the invention lowers the isoelectric point of attapulgite through modification, which is beneficial to the bonding of attapulgite and modified furfural slag powder, reduces the degree of dispersion and migration of attapulgite, and strengthens the Modified the rigidity of furfural slag, and enhanced the adsorption performance of pollutants. In addition, the sludge drying conditioner provided by the present invention is modified so that the polyquaternium salt and attapulgite are connected by hydrogen bonds, which prolongs the molecular chain structure and increases the adsorption of sludge destabilization on the polyquaternium salt molecular chain. site, which promotes sludge flocculation and improves the efficiency of sludge filtration and dewatering.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a sludge drying conditioner and a preparation method thereof. Background technique [0002] With the continuous acceleration of urbanization and industrialization, the sludge output of urban sewage treatment plants is increasing. These sludges generally have complex components, high moisture content and organic matter content, strong hydrophilicity, difficult dehydration, easy to smell, and serious pollution. Features. At this stage, the focus of commonly used sludge dewatering technology is mainly to increase the dehydration rate of sludge, which has little effect on the moisture content of sludge. Since the sludge dewatering performance is mainly affected by the particle size distribution of the sludge, the surface charge of the sludge colloid, and the extracellular polymer EPS, and it is difficult to remove the capillary water and surface adsorbed water i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/148C02F11/122
CPCC02F11/148C02F11/122C02F2303/06
Inventor 刘倩刘建磊王纬任凌伟陈淡宁
Owner ZHEJIANG TAOHUAYUAN ENVIRONMENTAL PROTECTION TECH
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