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A method for composite conditioning and deep dehydration of sludge

A deep dehydration and sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of large dosage and limited water content reduction of dehydrated cake , to achieve the effect of increasing porosity, simple process and easy control of conditions

Active Publication Date: 2021-03-26
UNIVERSTAR SCI & TECH SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method based on free radical oxidation sludge composite conditioning and deep dehydration, the purpose of which is to use active free radical oxidation to destroy sludge flocs to change particle characteristics, and directly use Oxidation reaction by-products (Fe 2+ , Fe 3+ , SO 4 2- ) acts as a crystallization agent to promote the hydration reaction of industrial by-product gypsum to form dihydrate gypsum phase (CaSO 4 2H 2 O) The skeleton structure material is used to construct the dehydration filtration channel, thereby solving the technical problems such as the need to adjust the pH of the existing advanced oxidation conditioning sludge, or simply adding powder material as an inert skeleton substance, and the water content of the dewatered cake is limited.

Method used

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  • A method for composite conditioning and deep dehydration of sludge
  • A method for composite conditioning and deep dehydration of sludge
  • A method for composite conditioning and deep dehydration of sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A compound conditioning method for sludge deep dehydration, the process steps are as follows:

[0062] S11: Starting from the remaining sludge with an organic matter content of 50.8wt% and a moisture content of 96.7wt%, add peroxodisulfate of 10wt% on a dry basis to the sludge, and stir thoroughly;

[0063] S12: adding 1.8wt% nanometer zero-valent iron on a dry basis to the sludge treated in step S11, and fully stirring for 15 minutes to complete the active free radical conditioning sludge;

[0064] S13: Subsequently, add 30wt% phosphogypsum to the sludge conditioned in step S12, and stir for 5 minutes to complete the composite conditioning;

[0065] S14: dehydrating the sludge conditioned in step S13 through plate and frame.

[0066] After testing, the S12 sludge filtration specific resistance is 1.67×10 13 m / kg down to 1.51×10 12 m / kg, the capillary water absorption time of the sludge decreased from 320.8s of the original sludge to 59.5s, and the S13 sludge filtrat...

Embodiment 2

[0068] A compound conditioning method for sludge deep dehydration, the process steps are as follows:

[0069] S21: Starting from the remaining sludge with an organic matter content of 43.86wt% and a moisture content of 95.3wt%, add peroxodisulfate of 8wt% on a dry basis to the sludge, and stir thoroughly;

[0070] S22: Add 1.5wt% nanometer zero-valent iron on a dry basis to the sludge treated in step S21, and fully stir for 10 minutes to complete the active free radical conditioning sludge;

[0071] S23: Subsequently, add 10wt% phosphogypsum to the sludge conditioned in step S22, and stir for 10 minutes to complete the composite conditioning;

[0072] S24: dehydrating the sludge conditioned in step S23 through plate and frame.

[0073] After testing, the S22 sludge filtration specific resistance is 1.61×10 13 m / kg down to 1.42×10 12 m / kg, the capillary water absorption time of the sludge decreased from 187.7s of the original sludge to 62.8s, and the S23 sludge filtration sp...

Embodiment 3

[0075] A compound conditioning method for sludge deep dehydration, the process steps are as follows:

[0076] S31: Starting from the centrifuge dewatered cake with an organic matter content of 50.6wt% and a moisture content of 82.0wt%, add water to slurry to a moisture content of 91.7wt%, and then add 3.3wt% of sludge on a dry basis to the sludge Nano-sized zero-valent iron, fully stirred;

[0077] S32: adding 10wt% monoperoxyhydrogensulfate free radical generator to the sludge treated in step S31, and fully stirring for 30 minutes to complete the active free radical conditioning sludge;

[0078] S33: Subsequently, add 15wt% desulfurization gypsum and 10wt% citrate gypsum to the sludge conditioned in step S32, and stir for 8 minutes to complete the composite conditioning;

[0079] S34: dehydrating the sludge conditioned in step S33 through plate and frame.

[0080] After testing, the S32 sludge filtration specific resistance is 1.24×10 when the slurry water content is 91.7%....

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Abstract

The invention provides a sludge deep dewatering method. The sludge deep dewatering method comprises the following steps: obtaining sludge containing a free radical generating substance; adding an activator to the sludge containing the free radical generating substance for activation, thereby obtaining the activated sludge; adding industrial byproduct gypsum to the activated sludge for mixing treatment, thereby forming conditioned sludge containing a new skeleton form substance; and performing dewatering treatment on the conditioned sludge. According to the sludge deep dewatering method, zero-valent iron or nano zero-valent iron is taken as the activator to react with the free radical generating substance to generate active free radicals, and therefore, the extracellular polymeric substance of the sludge can be effectively damaged and the filtering property of the sludge can be improved on one hand, and on the other hand, ions after the activation reaction is completed are capable of directly promoting the industrial byproduct gypsum to perform a hydration reaction, and the new substance morphology of the skeleton form can be controlled; the skeleton structure is capable of remarkably increasing the porosity of the sludge, and therefore, the deep dewatering of the sludge is realized.

Description

technical field [0001] The invention belongs to the technical field of domestic sewage sludge treatment, in particular to a sludge compound conditioning and deep dehydration method. Background technique [0002] The so-called domestic sewage sludge (also known as municipal sludge) is a general term for various sediments and floating objects produced in different treatment processes in urban domestic sewage treatment. The inherent characteristics of sludge cause sludge particles to have a high solid content near the filter medium, and a network structure is formed between the particles due to aggregation, thus hindering the sedimentation and compression of sludge. Therefore, it is generally necessary to take chemical conditioning measures to improve the sludge dewatering performance in order to carry out effective dehydration. [0003] At present, the commonly used sludge chemical conditioning methods include: (1) adding flocculant or coagulant, and improving the settling pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/06C02F11/143C02F11/122
CPCC02F11/06C02F11/14
Inventor 杨家宽时亚飞梁莎胡敬平虞文波宋健肖君徐新宇何姝杨旭
Owner UNIVERSTAR SCI & TECH SHENZHEN