Organic composite flocculant for conditioning and dehydration of sludge

A technology of composite flocculant and organic flocculant, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of restricting the subsequent utilization of sludge, small sludge floc aggregation particles, and high addition of inorganic flocculants. Achieve the effect of reducing the final moisture content, high dry solid cake, and low specific impedance value

Inactive Publication Date: 2012-07-04
苏州格瑞特环保科技产业发展有限公司
View PDF6 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The domestic application number is 200810198538.2. The patent uses the surfactant dodecyl dimethyl benzyl ammonium chloride (1227) to treat the sludge. Although it can reduce the specific resistance of the sludge, the researchers found that the single use of dodecane Dimethyl benzyl ammonium chloride has the disadvantages of small sludge floc aggregation particles, which are easy to stick to the filter cloth and make it difficult to filter the void, and the effect will be obvious only when the amount of the surfactant is large.
The patents with domestic application number 200810048825.5 and application number 200710150706.6

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix vinylamine / N-vinylformamide / vinylacrylamide copolymer (100% ionicity, molecular weight less than 1 million) with polyacrylamide (weight average molecular weight: 8 million) in a mass ratio of 9:1. Take the sludge from the thickening tank of a sewage treatment plant, the water content is 97%, and its specific resistance is measured to be 1.36×10 13 m / kg, which belongs to the sludge that is difficult to filter and dewater.

[0021] Take the mud and directly add 500ppm cationic polyacrylamide (the weight average molecular weight is 8 million, first dissolve to a concentration of 1‰, then add, stir for 10 minutes, and the stirring intensity decreases gradually), and the specific resistance is determined to be 5.65×10 11 m / kg, the filtration characteristics of sludge are improved.

[0022] After getting this mud and directly adding 500ppm dodecyl dimethyl benzyl bromide (chloride) ammonium (dissolved as 1% concentration and then stirring and adding), the specific resist...

Embodiment 2

[0026] Take polydimethyldipropylene ammonium chloride (100% ionicity, molecular weight less than 500,000) and polyacrylamide (weight-average molecular weight 8 million) according to the mass ratio of 9.5:0.5 mixed, take a sewage treatment plant concentration pool sewage Mud, with a water content of 97%, measured its specific resistance to be 1.36×10 13 m / kg, which belongs to the sludge that is difficult to filter and dewater.

[0027] Take the mud and directly add 500ppm of cationic polyacrylamide (the weight average molecular weight is 8 million, add after dissolving, stir for 10 minutes, and the stirring intensity decreases) and measure its specific resistance to be 5.65×10 11 m / kg, the filtration characteristics of sludge are improved.

[0028] Take the mud and add 500ppm (wt) of the mixed polymer of this example (wt, first dissolved in water to a mass concentration of 1‰, then stir and add, stir for 10 minutes, and the stirring intensity decreases), and the specific resis...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Specific resistanceaaaaaaaaaa
Specific resistanceaaaaaaaaaa
Specific resistanceaaaaaaaaaa
Login to view more

Abstract

The invention discloses an organic composite flocculant for conditioning and dehydration of sludge. An active substance of the organic composite flocculant mainly comprises a cationic organic compound A and a polymeric organic flocculant B in a mass ratio of (1-20):1. By combination of the two compounds, the unexpected synergistic effect can be obtained on the basis of no increase of the cost of the flocculant for sludge treatment, so that flocs formed in the flocculation process of the sludge are dense, the formation of large gelatinous flocs caused by adding a polymeric flocculant is avoided, and the moisture in the flocs can be optimally released so as to reduce the final water content in the sludge; and meanwhile, the specific resistance of the sludge can be remarkably improved, so that the filtration characteristic of the sludge is improved.

Description

technical field [0001] The invention belongs to the field of sludge dewatering, in particular to a high molecular polymer used for sludge dewatering. Background technique [0002] With the popularization of sewage treatment facilities and the improvement of treatment rate, the amount of sludge produced by sewage plants has increased significantly. The sludge produced by sewage treatment has a relatively high water content. Generally, the water content in the sludge reaches 95% to 99.5%. Because the water is very tightly combined with the sludge particles, it is difficult to separate the water in the sludge at low cost and efficiently. It is necessary to add a flocculant to improve the colloidal properties of the sludge, neutralize the surface charge of the sludge, make the sludge aggregate into large particles, and at the same time separate the water from the sludge particles to strengthen the dehydration of the sludge. Since the cost of sludge treatment and disposal accoun...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F11/14
Inventor 范宜东何坚李磊许磊
Owner 苏州格瑞特环保科技产业发展有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap