Conditioning coagulant for deep dehydrating sludge

A deep dehydration and coagulant technology, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of large amount of chemical addition, high amount, and decrease in the calorific value of sludge cake, and achieve a strong hydrophilic effect Effect

Inactive Publication Date: 2010-10-13
JIANGSU JINSHAN SOLID WASTE RESOURCE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, in domestic sludge dewatering, the polymer flocculant polyacrylamide (3‰DS) is generally used to dewater by belt filter or centrifuge, but the water content of the sludge after dehydration is still as high as 80%.
In recent years, there have been attempts to use the dehydration process of separately adding calcium-containing and iron-containing inorganic coagulants for conditioning, and there are also coagulant dehydration processes using polyaluminum chloride and polyacrylamide (patent number 200810198536.3), but the amount of medicament added is generally It is too large, and some calcium-containing inorganic chemicals are added as high as 50% DS, which is costly, and the calorific value of the sludge cake after conditioning and dehydration is greatly reduced, which cannot be incinerated and can only be landfilled, which greatly limits The way of comprehensive utilization of follow-up processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Combine non-ionic polymer flocculant with Fe 2 o 3 Mixing, the proportion is 1:10, and it is made into conditioning coagulant No.1.

[0030] 2. Take sludge from a sewage plant with a water content of 99.7%, add conditioning coagulant No.1, the addition amount is 0.05% of the dry sludge, and fully stir for 10 minutes;

[0031] 3. Inject the adjusted sludge into the plate-and-frame filter press through a pneumatic diaphragm pump. The sludge inlet pressure is 0.6MPa. After 60 minutes, keep the pressure at 1.6MPa for 30 minutes to remove the moisture in the sludge;

[0032] 4. After the pressure holding is completed, release the pressure and discharge the material.

[0033] After dehydration, the water content of the sludge reaches 62.2%, which meets the treatment requirements.

Embodiment 2

[0035] 1. Combine anionic polymer flocculant with Fe(OH) 3Mixed, the ratio is 1:10, made into conditioning coagulant No.2.

[0036] 2. Take the sewage plant sludge with a water content of 91.7%, add No.2 conditioning coagulant, the addition amount is 2% of the dry sludge, and fully stir for 10 minutes;

[0037] 3. Inject the adjusted sludge into the plate-and-frame filter press through a pneumatic diaphragm pump. The sludge inlet pressure is 0.6MPa. After 60 minutes, keep the pressure at 1.6MPa for 30 minutes to remove the moisture in the sludge;

[0038] 5. After the pressure holding is completed, release the pressure and discharge the material.

[0039] After dehydration, the moisture content of the sludge reaches 61.6%, which meets the treatment requirements.

Embodiment 3

[0041] 1. Combine cationic polymer flocculant with Fe 2 (CO 3 ) 3 , CaO mixed, the ratio is 1:5:5, dubbed as conditioning coagulant No.3.

[0042] 2. Take sewage plant sludge with a water content of 93.3%, add No.3 conditioning coagulant, the addition amount is 1% of the dry sludge, and fully stir for 10 minutes;

[0043] 4. Inject the adjusted sludge into the plate-and-frame filter press through a pneumatic diaphragm pump. The sludge inlet pressure is 0.6MPa. After 60 minutes, keep the pressure at 1.6MPa for 30 minutes to remove the moisture in the sludge;

[0044] 6. After the pressure holding is completed, release the pressure and discharge the material.

[0045] After dehydration, the moisture content of the sludge reaches 62.4%, which meets the treatment requirements.

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PUM

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Abstract

The invention relates to a conditioning coagulant for deep dehydrating sludge, which is composed of 0.05-50 w% of polymeric flocculant, 0.3-50 w% of chemical raw material containing Fe3+ and 0.3-50 w% of chemical raw material containing Ca2+. After the conditioning coagulant is added, under the combined actions of bridging effect, charge neutrality effect and dehydration effect of the polymeric flocculant and chemical raw materials containing Fe3+ and Ca2+, colloidal particle charges of the sludge are neutralized, the specific impedance of the sludge is reduced, and water in the sludge is removed, so that the solid content in the dehydrated filter cakes is increased. The invention has the advantages of small addition amount and low cost. After the sludge is dehydrated, the water content is reduced below 65%, and the combustion heat value of the dry sludge is reduced by less than 10%. The dehydrated sludge cakes are especially suitable for anhydration and incineration treatment of the sludge.

Description

technical field [0001] The invention relates to a coagulation preparation agent for sludge dewatering, in particular to a coagulation preparation agent for sludge dewatering which is composed of polymer flocculants and iron-calcium chemical raw materials. Background technique [0002] Sewage plant sludge is difficult to dispose of and has become an extremely fragile link, which is highly concerned and valued by the society. Sludge incineration technology can best achieve volume reduction, stabilization, and harmless treatment purposes, so it has become the first choice for sludge treatment technology in urban areas with land shortages. The high-efficiency and low-cost chemical preparation sludge dewatering technology can greatly reduce the overall cost of sludge treatment, so it is the key to sludge treatment and plays an extremely important role in the promotion of municipal sludge incineration technology. [0003] The purpose of sludge modulation pretreatment is to improv...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 黄瑛
Owner JIANGSU JINSHAN SOLID WASTE RESOURCE TECH
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