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Solidification/stabilization treatment method for papermaking sludge

A technology for stabilizing and treating papermaking sludge, which is applied in the field of environmental engineering, can solve problems such as potential safety hazards in landfills, increased loads on garbage dams, troublesome landfill operations, etc., to increase strength, reduce leaching rate, and reduce cement The effect of dosage

Inactive Publication Date: 2010-11-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the sludge particles are small, they often block the leachate collection system and drainage pipes, causing water to accumulate in the landfill, increasing the load of the garbage dam, and putting pressure on the safety and operation management of the landfill.
[0007] (2) The high viscosity of the sludge makes the landfill compactor often slip and sink in it, which brings trouble to the landfill operation
The rheology of the sludge makes the landfill deform and landslide, becoming an artificial swamp, which brings great safety hazards to the operation of the landfill

Method used

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  • Solidification/stabilization treatment method for papermaking sludge
  • Solidification/stabilization treatment method for papermaking sludge
  • Solidification/stabilization treatment method for papermaking sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Add 70kg of Portland cement, 25kg of fly ash, and 45kg of coal cinder to 1 ton of papermaking sludge, stir it mechanically for 10 minutes, lay it flat in the landfill, and add a waterproof membrane for maintenance. Lay the stirred solidified sludge mixture to a thickness of 5cm, and place it in a cool place for 2 days of maintenance. The compressive strength of the sludge solidified quickly reaches 160kPa, and the moisture content is 38%. The mass concentration of heavy metals leached from the solidified block meets the national standard (GB 5085.3- 2007).

Embodiment 2

[0043] Add 80kg of Portland cement, 30kg of fly ash, and 50kg of cinder to 1 ton of papermaking sludge, mix them with mechanical stirring for 12 minutes, lay them flat in the landfill, and add a waterproof membrane for maintenance. Lay the stirred solidified sludge mixture to a thickness of 30cm, and place it in a cool place for 5 days of maintenance. The compressive strength of the sludge solidified quickly reaches 210kPa, and the water content is 37.5%. The mass concentration of heavy metals leached from the solidified block meets the national standard (GB 5085.3- 2007).

Embodiment 3

[0045]Add 90kg of Portland cement, 30kg of fly ash, and 80kg of cinder to 1 ton of papermaking sludge, stir it mechanically for 15 minutes, lay it flat in the landfill, and add a waterproof membrane for maintenance. Lay the stirred solidified sludge mixture to a thickness of 50 cm, and place it in a cool place for curing for 8 days. The compressive strength of the sludge solidified quickly reaches 240kPa, and the moisture content is 35.4%. The mass concentration of heavy metals leached from the solidified block meets the national standard (GB 5085.3- 2007).

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Abstract

The invention discloses a solidification / stabilization treatment method for papermaking sludge. The method comprises the following steps of: adding a solidifying agent into the papermaking sludge with water content of 70 to 80 percent according to a weight ratio of the sludge to the solidifying agent of 100:14-24, stirring the mixture to react for 10 to 15 minutes and uniformly mixing the mixture to form solidified block precursors; and laying solidified block precursors which are uniformly stirred in a sludge landfill site according to a thickness of 5 to 100cm, covering a water-proof membrane on the solidified blocks and curing the solidified blocks for 2 to 10 days by using a dry curing method to form sludge solidified blocks, wherein the compressive strength of the sludge solidified block is 160 to 320kPa, the COD concentration in solidified block leaching solution is 110 to 200mg / L, and the water content of the solidified block is 30 to 40 percent; and the solidifying agent comprises the following components in percentage by weight: 40 to 50 percent of aluminate cement, 15 to 25 percent of fly ash and 30 to 40 percent of cinder; toxic heavy metal ions are wrapped after the sludge solidification, so that the pollution of the sludge is reduced; the solidified sludge does not have foul smell of the original sludge and reduces the harm to an operator during the operation; and the method has the advantages of readily available raw material, low cost, stable effect and simple operation procedure.

Description

technical field [0001] The invention relates to a solidification / stabilization treatment method for papermaking sludge, in particular to a harmless and resourceful treatment method for papermaking sludge. The papermaking sludge treated by this treatment method can improve the physical and chemical properties of the sludge landfill, and is convenient for sludge landfill treatment, and belongs to the technical field of environmental engineering. Background technique [0002] Papermaking sludge is a waste with complex components, mainly including insoluble cellulose, fillers, coagulants, etc. Due to its high water content (above 60%), complex components, perishable, odorous, and contains a large number of pathogenic bacteria, parasitic Insect eggs, a small amount of heavy metals and inks are difficult to process and utilize. If it is discharged directly without treatment, the papermaking sludge will easily cause secondary pollution to groundwater, soil, etc. after being soaked...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 宁寻安李仕文刘敬勇杨佐毅李磊
Owner GUANGDONG UNIV OF TECH
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