Sludge combined conditioner based on moderate flocculation and protein solidification theory, conditioning method of sludge combined conditioner and economic dosage determination method

A technology for determining methods and conditioning agents, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of residual inorganic ion components, poor sludge dehydration performance, and large dosage of chemicals To achieve the effect of increasing the calorific value of incineration, increasing the particle size of flocs, and preventing clogging

Active Publication Date: 2022-04-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the above-mentioned problems existing in the prior art, this application provides a conditioning method of sludge chemical joint conditioner based on the theory of moderate flocculation and protein solidification. The method of solidification and re-flocculation can greatly improve the dehydration ability of sludge, and the moisture content of the prepared mud cake can meet the requirement of <60%, and the sludge is conditioned by using organic agents, the dosage is less than 5%, and the increase in conductivity is <10%. , the dehydration efficiency is stable and controllable, which solves the defects of poor sludge dehydration performance, large dosage of chemicals and more residual inorganic ion components in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a kind of conditioning method of the combined sludge conditioner based on moderate flocculation and protein solidification theory, and the conditioning method comprises the following steps:

[0038] S1. Add 1.0% tannic acid to the sludge to be treated on a dry basis, and apply magnetic stirring at 300 rpm for 15 minutes to obtain pretreated sludge;

[0039] S2. Adding 1.0% of polydimethyldiallylammonium chloride to the pretreated sludge obtained in S1, which accounts for 1.0% of the dry weight of the sludge to be treated, and applying 300 rpm magnetic stirring for 5 minutes to obtain conditioned sludge;

[0040] S3. Transfer the conditioned sludge obtained in S2 to a micro plate and frame filter press with a pressure of 0.9 MPa for 10 minutes to obtain a mud cake.

[0041] Experimental results:

[0042] In this embodiment, the sludge specific resistance reduction rate is 95%, the CST reduction rate is 86%, and the moisture content of the mud ca...

Embodiment 2

[0044] This embodiment provides a kind of conditioning method of the combined sludge conditioner based on moderate flocculation and protein solidification theory, and the conditioning method comprises the following steps:

[0045] S1. Add condensed tannins accounting for 2.2% of the dry weight of the sludge to be treated to the sludge to be treated, and apply magnetic stirring at 500 rpm for 5 minutes to obtain pretreated sludge;

[0046] S2. Add sodium polyacrylate accounting for 1.0% of the dry weight of the sludge to be treated to the pretreated sludge obtained in S1, and apply magnetic stirring at 500 rpm for 3 minutes to obtain conditioned sludge;

[0047] S3. Transfer the conditioned sludge obtained in S2 to a micro plate and frame filter press with a pressure of 0.6 MPa for 30 minutes to obtain a mud cake.

[0048] Experimental results:

[0049] In this embodiment, the sludge specific resistance reduction rate is 94%, the CST reduction rate is 85%, and the moisture con...

Embodiment 3

[0051] This embodiment provides a kind of conditioning method of the combined sludge conditioner based on moderate flocculation and protein solidification theory, and the conditioning method comprises the following steps:

[0052] S1. Adding 1.0% tannin extract to the sludge to be treated on a dry basis, and applying magnetic stirring at 400 rpm for 20 minutes to obtain pretreated sludge;

[0053] S2. Add polyvinyl ether accounting for 1.5% of the dry weight of the sludge to be treated to the pretreated sludge obtained in S1, and apply magnetic stirring at 400 rpm for 10 minutes to obtain conditioned sludge;

[0054] S3. Transfer the conditioned sludge obtained in S2 to a micro plate and frame filter press with a pressure of 1.0 MPa for 10 minutes to obtain a mud cake.

[0055] Experimental results:

[0056] In this embodiment, the sludge specific resistance reduction rate is 92%, the CST reduction rate is 88%, and the moisture content of the mud cake is 56%.

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Abstract

The invention provides a sludge chemical combined conditioner based on a moderate flocculation and protein curing theory. The sludge chemical combined conditioner comprises a protein curing agent accounting for 0.5-2.5% of the dry basis mass of to-be-treated sludge and a flocculating agent accounting for 0.5-2.5% of the dry basis mass of the to-be-treated sludge, the invention further provides a conditioning method of the sludge chemical combined conditioner based on the moderate flocculation and protein solidification theory, a method of firstly solidifying and then flocculating is adopted, the dewatering capacity of the sludge is greatly improved, and the water content of a prepared sludge cake meets the requirement of 1t; the sludge is conditioned by using an organic agent, the addition amount is lower than 5%, and the conductivity is increased by lt; and the dehydration efficiency is stable and controllable, and the defects of poor sludge dehydration performance, large agent dosage and more inorganic ion component residues in the prior art are overcome.

Description

technical field [0001] The invention relates to the technical field of sludge treatment in municipal sewage plants, in particular to a sludge chemical joint conditioner based on the theory of moderate flocculation and protein solidification, a conditioning method and a method for determining economic dosage. Background technique [0002] Sludge is the main by-product of sewage biological purification treatment, enriching a large number of pathogenic bacteria, heavy metals, and organic pollutants. If it cannot be effectively treated and disposed of, it will produce extremely serious environmental secondary pollution. With the continuous improvement of economic development and urbanization, the rate of sewage collection and treatment in my country has increased year by year. By 2020, a total of 58.825 billion tons of sewage will be treated throughout the year, and 58.7939 million tons of sludge will be generated (with a moisture content of 80%). Such a huge volume of sludge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/147C02F11/122
Inventor 李杰刘汨莎茹少钦袁辰玮刘建勇
Owner SHANGHAI UNIV
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