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Composite sludge curing agent

A sludge solidifying agent and chelating agent technology, which is applied in the fields of sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can improve the ability to remove organic matter, high adsorption and ion exchange capacity, and large specific surface area.

Inactive Publication Date: 2018-01-16
江苏和合环保集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, studies have found that adding composite cement, fly ash, and lime to sludge can better improve the mechanical properties of landfill soil, but ordinary cement and lime set and harden slowly, and they will appear when the water-solid ratio is high. The phenomenon of partial settlement before coagulation, and the high content of organic matter in the sludge will hinder the hydration reaction of cement, and the curing effect is poor or even impossible.
In addition, the pH value of the solidified soil consolidated with lime, cement and other solidifying agents is relatively high, and heavy metal compounds are dissolved and released with the change of environmental conditions, which is not conducive to subsequent resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A composite sludge curing agent, characterized in that it consists of the following components by weight: 41 parts of modified zeolite, 17 parts of attapulgite, 10 parts of scrap steel slag, 12 parts of aluminum sulfate cement, 17 parts of lime, anionic polymer 13 parts of acrylamide, 2 parts of natural polymer chelating agent, 0.4 part of gelatinized starch.

[0027] Its preparation method comprises the following steps:

[0028] S1: Grind natural zeolite to a particle size below 100 mesh, add zeolite powder and hexadecyltrimethylammonium bromide (HDTMA) to ultrapure water at a mass ratio of 1:6, and place the mixture at a constant temperature After shaking in a shaking box for 24 hours at 40°C and a rotating speed of 1000r / min, take it out and dry it naturally to obtain a modified zeolite;

[0029] S2: Crushing and grinding the attapulgite and scrap steel slag through a grinder in proportion to a particle size of less than 80 mesh;

[0030] S3: Add the modified zeoli...

Embodiment 2

[0033] A composite sludge curing agent, characterized in that it consists of the following components by weight: 43 parts of modified zeolite, 18 parts of attapulgite, 14 parts of scrap steel slag, 12 parts of aluminum sulfate cement, 18 parts of lime, anionic polymer 15 parts of acrylamide, 4 parts of natural polymer chelating agent, 0.5 part of gelatinized starch.

[0034] Its preparation method comprises the following steps:

[0035] S1: Grind natural zeolite to a particle size below 100 mesh, add zeolite powder and hexadecyltrimethylammonium bromide (HDTMA) to ultrapure water at a mass ratio of 1:6, and place the mixture at a constant temperature After shaking in a shaking box for 24 hours at 40°C and a rotating speed of 1000r / min, take it out and dry it naturally to obtain a modified zeolite;

[0036] S2: Crushing and grinding the attapulgite and scrap steel slag through a grinder in proportion to a particle size of less than 80 mesh;

[0037] S3: Add the modified zeoli...

Embodiment 3

[0040] A composite sludge curing agent, characterized in that it consists of the following components by weight: 43 parts of modified zeolite, 20 parts of attapulgite, 14 parts of scrap steel slag, 12 parts of aluminum sulfate cement, 18 parts of lime, anionic polymer 15 parts of acrylamide, 4 parts of natural polymer chelating agent, 0.7 part of gelatinized starch.

[0041] Its preparation method comprises the following steps:

[0042] S1: Grind natural zeolite to a particle size below 100 mesh, add zeolite powder and hexadecyltrimethylammonium bromide (HDTMA) to ultrapure water at a mass ratio of 1:6, and place the mixture at a constant temperature After shaking in a shaking box for 24 hours at 40°C and a rotating speed of 1000r / min, take it out and dry it naturally to obtain a modified zeolite;

[0043] S2: Crushing and grinding the attapulgite and scrap steel slag through a grinder in proportion to a particle size of less than 80 mesh;

[0044] S3: Add the modified zeoli...

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Abstract

The invention relates to a composite sludge curing agent. The composite sludge curing agent is prepared from the following components in parts by weight: 40 to 43 parts of modified zeolite, 15 to 20 parts of attapulgite, 10 to 15 parts of waste steel residues, 10 to 15 parts of aluminum sulfate cement, 15 to 20 parts of lime, 13 to 15 parts of anionic polyacrylamide, 2 to 5 parts of a natural macromolecular chelating agent and 0.2 to 0.8 part of gelatinized starch. The sludge curing agent provided by the invention has strong through force, high speed and small use amount; the formed condensateis rapid in hardening and high in early strength, has good curing effect and guarantees that the later strength is not reduced; the stink of the sludge can be removed; release of heavy metal and nitrogen and phosphorus to the environment are reduced; in addition, the waste steel residues are adopted, so the effect of treating waste by waste is achieved.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a composite sludge solidifying agent. Background technique [0002] The composition of municipal sludge is complex, containing a large number of microorganisms, pathogens, heavy metals and organic pollutants. The sludge quality usually accounts for 0.3%-0.5% of the sewage volume, and after advanced treatment, the sludge volume will increase by 0.5-1 times. In addition, with the development of the global economy and the increase in activities to modify the earth's geographical environment, there are more and more dredging operations in coastal and inland rivers and lakes, as well as in urban waterways. [0003] These sludge or silt particles are small, not easy to dehydrate, have low bearing capacity, high organic matter content, and high fluidity, so they cannot be directly used as engineering fill in reclamation projects, embankment projects, and road projects. Heavy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 许怡
Owner 江苏和合环保集团有限公司
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