Treatment method for solidifying sludge of sewage plant in city

A technology for urban sewage and solidification treatment, applied in the field of environmental engineering, can solve the problems that the physical properties of dewatered sludge cannot meet the soil mechanics requirements of the landfill, reduce the utilization of the effective volume of the landfill, and affect the environmental quality of the landfill, etc. Achieve the effect of low leaching toxicity, reducing leaching rate and increasing strength

Active Publication Date: 2007-10-10
GUOZHONG AIHUA TIANJIN MUNICIPAL ENCIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the sanitary landfill process of sludge. For example, the physical properties of dewatered sludge are often difficult to meet the soil mechanics requirements of the landfill; In some areas, especially in the rainy south of my country, the sludge in the sludge landfill even becomes a liquid concentration pool; The filtrate flows out, thus, the sludge landfill greatly affects the environmental quality of the landfill
For this reason, sludge landfills at home and abroad often need to add a large amount of filler materials such as sand and soil to the sludge during the sludge landfill p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Take the dewatered sludge from the urban sewage plant with a moisture content of 70%, and add water to adjust the sludge to make the moisture content reach 85%. Then, based on the weight of the sludge, 8% Portland cement and 1% lime were added to the sludge and stirred evenly by a mechanical mixer. When the mixture is laid with a thickness of 100cm and cured for 3 days, its compressive strength can reach 128KN / m 2 , When curing for 15 days, the strength reaches 1500KN / m 2 At this time, the compressive strength of the sludge solidified body can still reach 508KN / m after being soaked in 10 ℃ water for 28 days 2 ; When the thickness of the mixture is 5cm, the compressive strength can reach 4000KN / m after curing for 15 days 2 , the compressive strength can still reach 1700KN / m after soaking in 10℃ water for 28 days 2 . The results of the leaching toxicity test showed that heavy metals such as cadmium, nickel, chromium, mercury, lead, and copper, as w...

Example Embodiment

[0020] Example 2

[0021] Take dewatered sludge with a moisture content of 75%, add 8% Portland cement, 3% lime, and 1% aluminum chloride to the sludge based on the weight of the sludge, stir evenly with a mechanical mixer, and spread it to the filling level. Buried, covered with waterproof membrane for maintenance. When the mixture is laid with a thickness of 20cm and cured for 7 days, its compressive strength can reach 1550KN / m 2 , when curing for 15 days, the compressive strength can reach 4380KN / m 2 , at this time, the compressive strength of the cured body can still reach 2890KN / m after being soaked in 10 ℃ water for 28 days 2 ; When the thickness of the mixture is 100cm, the compressive strength can reach 1000KN / m after curing for 15 days 2 , the compressive strength can still reach 650KN / m after soaking in 10℃ water for 28 days 2 . The results of the leaching toxicity test showed that heavy metals such as cadmium, nickel, chromium, mercury, lead and copper, as well...

Example Embodiment

[0022] Example 3

[0023] Take dewatered sludge with a moisture content of 70%, and add water to adjust the sludge so that the moisture content reaches 75%. Based on the weight of the sludge, 3% Portland cement and 8% cinder are added to the sludge, which is uniformly stirred by mechanical stirring, and then is spread into the landfill, and a waterproof membrane is added for maintenance. When the mixture is laid with a thickness of 5cm and cured for 3 days, its compressive strength can reach 250KN / m 2 , the compressive strength can still reach 100KN / m after soaking in 10℃ water for 28 days 2 ; When the thickness of the mixture is 100cm, the compressive strength can reach 2500KN / m after curing for 15 days 2 , the compressive strength can still reach 1350KN / m after soaking in 10℃ water for 28 days 2 . The results of the leaching toxicity test showed that the contents of heavy metals such as cadmium, nickel, chromium, mercury, lead, and copper were all less than or equal to 0...

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PUM

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Abstract

This invention relates to a method for solidification treatment of sludge discharged from urban sewage treatment plant. The method utilizes solidification and stabilization techniques to treat sludge discharged from urban sewage treatment plant, and improve its landfill physicochemical properties, thus can solve the problems related to sludge landfill. The method adopts cement as the solidification agent, and one or more of lime, aluminum salt, aluminum oxide and cinder as the coagulant aid. The method comprises: adding 3-8% solidification agent and 1-8% coagulant aid into sludge, mechanically stirring uniformly, spreading onto a landfill site, covering with a waterproof film, dry-maintaining for 3-15 days, and performing following landfill. The method has such advantages as low cost, easy operation and good effect. The treated sludge has such advantages as high compressive strength, high soaking resistance and low leaching toxicity.

Description

technical field [0001] The invention relates to a solidification treatment method for urban sewage plant sludge. The treated sludge can improve the physical and chemical properties of sludge landfill and facilitate sludge landfill treatment, and belongs to the technical field of environmental engineering. Background technique [0002] At present, the main means of sludge disposal in urban sewage treatment plants include landfill, land utilization, incineration and utilization of building materials. Among them, the cost of landfill disposal is relatively low, and the operation is relatively simple, so it is widely used. However, there are many problems in the sanitary landfill process of sludge. For example, the physical properties of dewatered sludge are often difficult to meet the soil mechanics requirements of the landfill; In some areas, especially in the rainy south of my country, the sludge in the sludge landfill even becomes a liquid concentration pool; The filtrate fl...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 朱南文车承丹李艳林赵玲王方林尹炳奎
Owner GUOZHONG AIHUA TIANJIN MUNICIPAL ENCIRONMENT ENG
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