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Solidification treatment method for sludge of urban sewage plant

A technology for urban sewage and solidification treatment, applied in the field of environmental engineering, can solve the problems of large area, high treatment cost, long maintenance time, etc., and achieve the effects of improved efficiency, low economic cost and low leaching toxicity

Inactive Publication Date: 2012-04-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing sludge solidification technology has problems such as long maintenance time, large floor area, high treatment cost, and low efficiency under low temperature conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 : Take 1 ton of urban sewage plant dewatered sludge with a water content of 81.1% at a temperature of 10±2°C; take the weight of the dewatered sludge as a basis, and mix the curing agent components (namely lime, sulphoaluminate cement, Portland cement, fly ash) according to 19kg of lime, 61kg of sulphoaluminate cement, 37kg of Portland cement, and 60kg of fly ash, the curing agent is added to the dewatered sludge and mixed evenly. Stacked at 7cm, added waterproof membrane, and cured for 3 days by dry curing method, the unconfined compressive strength of the sludge solidified block reached 72.71kpa, the moisture content reached 59.97%, and the removal rate of leached pollutant COD (chemical oxygen demand) The removal rate of ammonia nitrogen was 82.11%, and the removal rate of ammonia nitrogen was 92.19%, meeting the mixed landfill standard. Calculated according to the market price in 2011, under this temperature condition, the cost of curing agent needed to s...

Embodiment 2

[0016] Example 2: At a temperature of 20±2°C, take 1 ton of urban sewage plant dewatered sludge with a moisture content of 81.1%; Salt cement, fly ash) according to lime 17kg, sulfoaluminate cement 39kg, Portland cement 30kg, fly ash 60kg, add the curing agent to the dewatered sludge and mix evenly, according to the height of 7cm Stacking, adding a waterproof membrane, and curing for 3 days by dry curing method, the unconfined compressive strength of the sludge solidified block reached 81.04kpa, the moisture content reached 59.79%, the removal rate of leached pollutants COD was 80.57%, and the removal rate of ammonia nitrogen It is 92.37%, meeting the mixed landfill standard. Calculated according to the market price in 2011, under this temperature condition, the cost of curing agent needed to solidify 1 ton of sludge is 56.0 yuan, which is significantly lower than the current common solidification method.

Embodiment 3

[0017] Example 3: At a temperature of 30±2°C, take 1 ton of urban sewage plant dewatered sludge with a moisture content of 81.1%; Salt cement, fly ash) according to lime 12kg, sulfoaluminate cement 30kg, Portland cement 30kg, fly ash 47kg, add the curing agent to the dewatered sludge and mix evenly, according to the height of 7cm Stacking, adding waterproof membrane, and curing for 3 days by dry curing method, the unconfined compressive strength of the solidified sludge block reached 127.54kpa, the moisture content reached 58.51%, the removal rate of leached pollutants COD was 80.28%, and the removal rate of ammonia nitrogen It is 92.22%, meeting the mixed landfill standard. Calculated according to the market price in 2011, under this temperature condition, the cost of curing agent needed to solidify 1 ton of sludge is 45.4 yuan, which is significantly lower than the current common solidification method.

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Abstract

The invention discloses a solidification treatment method for sludge of urban sewage plants. The method comprises the following steps of (1) adding curing agent consisting of lime, sulfate aluminum cement, portland cement and fly ash in dehydrated sludge based on the weight of the dehydrated sludge, wherein the weight percentage of lime, sulfate aluminum cement, portland cement and fly ash in the curing agent are as follows: 1.2-1.9% of lime, 3.0-6.1% of sulfate aluminum cement, 3.0-3.7% of portland cement and 4.7-6.0% of fly ash; and (2) mixing the sludge added with the curing agent to form precursors of solidified blocks, piling the precursors up according to a height of 7 cm, and covering with waterproof membrane, maintaining the precursors for three days with a dry maintaining method, and forming sludge solidified blocks. The method provided by the invention has the advantages of efficiency, low cost, simple operation and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a solidification treatment method for urban sewage plant sludge. Background technique [0002] At present, the disposal methods of urban sewage plant sludge are mainly landfill, land use, and building material utilization. Among them, sludge landfill disposal is a relatively mature sludge disposal technology. One of its advantages is that the treatment cost is low, and the second is that the treatment process is simple, which quickly solves the problem of sludge outlet; the disadvantage is that sludge is closely related to life. The rheology of the sludge during the mixed landfill of garbage makes the landfill easily deformed, landslides, and landslides, and becomes a man-made "swamp" with great potential safety hazards; the high viscosity of the sludge causes garbage transport vehicles, bulldozers, Excavators and other machinery skid, get stuck, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 周健卿晓霞方俊华詹芹周炯刘杰韩懿何雨舟
Owner CHONGQING UNIV
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