Slurrying and visbreaking method for improving liquidity of dewatered sludge

A technology for dewatering sludge and fluidity, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of complex equipment structure, cumbersome pulping operation, and high pulping energy consumption, To achieve the effect of simple installation and operation

Active Publication Date: 2013-01-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two pulping methods for dewatered sludge use traditional heating methods, but the disadvantages are high energy consumption, complex equipment structure, and cumbersome pulping operations.

Method used

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  • Slurrying and visbreaking method for improving liquidity of dewatered sludge
  • Slurrying and visbreaking method for improving liquidity of dewatered sludge
  • Slurrying and visbreaking method for improving liquidity of dewatered sludge

Examples

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Embodiment 1

[0028] Such as Figure 1-3 As shown, the dewatered sludge pulping device is composed of: 1 bearing and bearing support, 2 inner ribbon of agitator, 3 outer ribbon of agitator, 4 inlet of salt solution, 5 inlet of alkali solution, 6 main tank Body, 7 shafts, 8 couplings, 9 transmissions, 10 motors, 11 brackets, 12 discharge ports, 13 feed ports. Wherein, the feeding port 13 is used for putting in the initial material at one time, and the volume of the material contained in the main tank body 6 should be controlled to be no higher than the upper edge of the outer ribbon 3 of the agitator. When dosing, the powdered inorganic salt and alkaline substance can be put into the main tank 6 from the feed port 13, or it can be prepared into a concentrated solution in an external container, and the peristaltic pump is connected to the salt solution drug inlet 4 and the alkali solution is fed. Medicine mouth 5 carries out continuous medicine feeding. The agitator is composed of a stirrin...

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Abstract

The invention relates to the field of solid waste treatment, in particular to a slurrying and visbreaking method for improving liquidity of dewatered sludge. The method includes: placing the dewatered sludge into a container with a shearing and stirring function, closing a feeding port to enable the container to be hermetic, and enabling the dewatered sludge to be in an anoxic or anaerobic environment; setting the rotation speed of a stirrer to be 10-40r/min; continuously stirring the dewatered sludge, and adding inorganic salts or/and alkaline substances for catalysis, wherein stirring time is in inverse proportion to the set rotation speed at the stage, and the minimum stirring time is 2.5h; and when material viscosity is lowered by more than 40%, lowering the stirring rotation speed to10-30r/min, setting a 'stirring/stopping' time proportion of the stirrer to be 1/5-1/1, wherein the stirring time is in inverse proportion to the set rotation speed, and materials can be slurried after 15-30h. By controlling the stirring speed, the anoxic environment and stirring modes to enable physical slurrying and biological slurrying to play a synergetic role, slurrying efficiency of the dewatered sludge is improved, and viscosity of the dewatered sludge can be lowered by 70-80% within 20-35h, so that the slurrying and visbreaking method for improving liquidity of the dewatered sludge isefficient, low in consumption, simple in device and operation and suitable for amplification and popularization in projects.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a pulping and viscosity-reducing method for improving the fluidity of dewatered sludge. Background technique [0002] The primary sludge and excess sludge produced by urban sewage treatment plants for purifying domestic sewage are concentrated and dewatered to form dewatered sludge with a moisture content of about 75-80%. Dewatered sludge is a semi-plastic non-fluid material with a viscosity range of 2,000,000~8,000,000cp. In the process of engineering treatment, there are problems such as high difficulty, high energy consumption, and easy blockage in pipeline transportation of high-solid sludge. The transportation of dewatered sludge often becomes one of the limiting factors in the design of sludge treatment process and equipment. In addition, in recent years, the sludge dry anaerobic digestion process of anaerobic digestion of dewatered sludge has been proved ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04
Inventor 董滨段妮娜戴翎翎戴晓虎
Owner TONGJI UNIV
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