Sludge dehydrating agent as well as preparation method and application thereof

A technology of sludge dehydrating agent and water supply sludge, which is applied in the direction of water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problems of high cost of water supply sludge and unfavorable industrial production, and achieve a wide range The effect of developing space and application value, improving resource utilization, and reducing processing costs

Inactive Publication Date: 2019-01-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a sludge dewatering agent and its preparation method and application, which solves the problems of high cost and unfavorable industrial production in the modification of feedwater sludge, and improves the efficiency of feedwater sludge. Resource Utilization in Sewage Dehydration

Method used

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  • Sludge dehydrating agent as well as preparation method and application thereof
  • Sludge dehydrating agent as well as preparation method and application thereof
  • Sludge dehydrating agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) The water supply sludge taken from the water supply plant is washed with clean water for 3 times, and filtered to obtain a water supply sludge slurry with a water content of 90%;

[0033] 2) Weigh a certain amount of chitosan and dissolve it with 1% acetic acid solution to obtain a chitosan solution with a concentration of 2%;

[0034] 3) Take the feedwater sludge slurry prepared in step 1) and the chitosan solution prepared in step 2), and mix them at a volume ratio of 1:2 to obtain a mixed solution, and then add epichlorohydrin (ECH) at a concentration of 1 g / L NaOH solution to obtain a solidified cross-linking solution with a volume fraction of 3%, and then add the mixed solution dropwise to the solidified cross-linked solution, and obtain a particle size of 0.4-0.6 cm after curing and cross-linking at 40°C for 8 hours. solid pellets;

[0035] 4) Filter out the solid pellets obtained in step 3), wash them with deionized water, and dry them in a drying oven at 60...

Embodiment 2

[0037] 1) The water supply sludge taken from the water supply plant is washed with clean water for 3 times, and filtered to obtain a water supply sludge slurry with a water content of 90%;

[0038] 2) Weigh a certain amount of chitosan and dissolve it with 1% acetic acid solution to obtain a chitosan solution with a concentration of 3%;

[0039] 3) Take the feedwater sludge slurry prepared in step 1) and the chitosan solution prepared in step 2), and mix them at a volume ratio of 1:2 to obtain a mixed solution, and then add epichlorohydrin (ECH) at a concentration of 1 g / L NaOH solution to obtain a solidified cross-linking liquid with a volume fraction of 2%, and then add the mixed solution dropwise to the solidified cross-linked liquid, and obtain a particle size of 0.4-0.6 cm after curing and cross-linking at 50°C for 12 hours. solid pellets;

[0040] 4) Filter out the solid pellets obtained in step 3), wash them with deionized water, and dry them in a drying oven at 60°C ...

Embodiment 3

[0042] 1) The water supply sludge from the water supply plant is washed with clean water for 3 times, and filtered to obtain the water supply sludge slurry with a water content of 80%;

[0043] 2) Weigh a certain amount of chitosan and dissolve it with 1% acetic acid solution to obtain a chitosan solution with a concentration of 1%;

[0044] 3) Take the water supply sludge slurry prepared in step 1) and the chitosan solution prepared in step 2), and mix them at a volume ratio of 1:2 to obtain a mixed solution, and then add epichlorohydrin (ECH) at a concentration of 3g / A volume fraction of 4% of the solidified cross-linking solution was obtained in a NaOH solution of 1 L, and then the mixed solution was added dropwise to the solidified cross-linked liquid, and solid particles with a particle size of 0.5 cm were obtained after curing and cross-linking at 60°C for 6 hours. ball;

[0045] 4) Filter out the solid pellets obtained in step 3), wash them with deionized water, and dry...

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Abstract

The invention discloses a sludge dehydrating agent as well as a preparation method and application thereof. The sludge dehydrating agent is prepared from water mud slurry and a chitosan solution; thepreparation method comprises the steps of evenly mixing the water mud slurry with the chitosan solution according to a volume ratio of 1 to 2, curing, filtering and drying to form granular pellets, wherein water supply sludge is matrix, and chitosan is used as a modifying agent; by adding a crosslinking agent and a solidifying liquid, a polymer with a polymer chain can be formed after hydrolysis and polycondensation reactions, so that the reaction activity of the water supply sludge is improved, the dewatering performance of the excess sludge is significantly improved, the treatment cost of the excess sludge is further lowered, and the resource utilization rate of the water supply sludge is improved. Furthermore, the method is simple in facilities, easy to operate, free from toxic effect on workers, does not cause secondary pollution, and can be applied to large-scale industrial production, thus having a wider development space and application value in the field of water treatment.

Description

technical field [0001] The invention relates to the field of water supply sludge treatment, in particular to a sludge dewatering agent and its preparation method and application. Background technique [0002] Water supply sludge is a pollutant produced by urban municipal water supply plants. It is a general term for the sludge that is settled by coagulation and flocculation of drinking water source water in sedimentation tanks. The coagulants used in large-scale drinking water plants are iron and aluminum salts, so the main components of feedwater sludge are mixtures of metal hydroxides, humus, turbidity, color and organic matter, and silicates. The discharge of water supply sludge will pollute the environment, and how to dispose of water supply sludge is also a common task faced by all waterworks. A large number of experimental studies have been carried out on the disposal of water supply sludge at home and abroad, and the water supply sludge is modified and directly used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148
CPCC02F11/14
Inventor 杜海霞吴俊吴艳霞张蕾黄紫旖文蕾郑尹怀吴慧芳
Owner NANJING UNIV OF TECH
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