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Method for solidifying and stabilizing sludge from urban sewage treatment plant

A technology for solidifying urban sewage and sludge, applied in the field of environmental engineering, can solve problems such as large amount of cement and lime mixed, increase sludge disposal volume, reduce moisture content, etc., so as to reduce pollution problems and treatment costs, and realize resource utilization. processing effect

Inactive Publication Date: 2013-01-30
北京山水青环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, cement, lime, fly ash, etc. are generally used as curing agents at home and abroad. Studies have shown that these curing agents can improve their mechanical properties to a certain extent, reduce moisture content, and meet landfill or construction soil standards. The large amount not only greatly increases the volume of sludge disposal, but also increases the disposal cost

Method used

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  • Method for solidifying and stabilizing sludge from urban sewage treatment plant
  • Method for solidifying and stabilizing sludge from urban sewage treatment plant
  • Method for solidifying and stabilizing sludge from urban sewage treatment plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) Preparation of industrial waste residue mixture: Mix fly ash, coal gangue, slag, phosphogypsum, and quicklime evenly, and the weight ratio of each component is as follows:

[0014]

[0015] 2) Preparation of curing stabilizer: mix the industrial waste residue mixture and portland cement evenly, and the weight ratio of each component is as follows:

[0016] Industrial waste 45%,

[0017] Portland cement 55%;

[0018] 3) Send the sludge and the solidified stabilizer into the mixer with a screw conveyor, in which the solidified stabilizer accounts for 5% of the total weight of the sludge. After mixing it thoroughly for 10-15 minutes, pump the solidified sludge out to Nursery;

[0019] 4) After curing the solidified sludge in the curing field for 7 days, the moisture content of the solidified sludge is 55.2%, lower than 60%, the unconfined compressive strength is 217.8Kpa, and the concentrations of heavy metals in the leachate are all lower than the relevant standar...

Embodiment 2

[0021] 1) Preparation of industrial waste residue mixture: Mix fly ash, coal gangue, slag, phosphogypsum, and quicklime evenly, and the weight ratio of each component is as follows:

[0022]

[0023] 2) Preparation of curing stabilizer: mix the industrial waste residue mixture and portland cement evenly, and the weight ratio of each component is as follows:

[0024] Industrial waste 50%,

[0025] Portland cement 50%;

[0026] 3) Send the sludge and solidified stabilizer into the mixer with a screw conveyor, in which the solidified stabilizer accounts for 8% of the total weight of the sludge. After fully mixing for 10-15 minutes, use a pump to pump out the solidified sludge until curing field;

[0027] 4) After curing the solidified sludge in the curing field for 7 days, the moisture content of the solidified sludge is 46.8%, lower than 60%, the unconfined compressive strength is 332.5Kpa, and the concentration of heavy metal substances in the leachate is lower than the re...

Embodiment 3

[0029] 1) Preparation of industrial waste residue mixture: Mix fly ash, coal gangue, slag, phosphogypsum, and quicklime evenly, and the weight ratio of each component is as follows:

[0030]

[0031] 2) Preparation of curing stabilizer: mix the industrial waste residue mixture and portland cement evenly, and the weight ratio of each component is as follows:

[0032] Industrial waste 55%,

[0033] Portland cement 45%;

[0034] 3) Send the sludge and solidified stabilizer into the mixer with a screw conveyor, in which the solidified stabilizer accounts for 10% of the total weight of the sludge. After fully mixing for 10-15 minutes, use a pump to pump out the solidified sludge until curing field;

[0035] 4) After curing the solidified sludge in the curing field for 7 days, the moisture content of the solidified sludge is 45.7%, lower than 60%, the unconfined compressive strength is 395Kpa, and the concentration of heavy metal substances in the leachate is lower than the rel...

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Abstract

The invention relates to a method for solidifying and stabilizing sludge from an urban sewage treatment plant, belonging to the technical field of environmental engineering. The method comprises the following steps: under room temperature conditions, evenly mixing industrial residue and silicate cement according to a certain ratio; and adding the mixture used as sludge solidifying and stabilizing agent and sludge into a stirrer, evenly stirring, and then curing for 3-7 days to ensure that the water content and strength of the sludge meet the requirements of soil for landfill and construction. According to the invention, the industrial residue is used for solidifying the sludge, and the unique advantage of the industrial residue is fully utilized, so that the solidified sludge can achieve better technical indices, the treatment of wastes with processes of wastes against one another is achieved, and the pollution problem and treatment cost caused by the industrial residue and sludge are greatly reduced, thereby realizing the recycling of wastes.

Description

technical field [0001] The invention relates to a method for solidifying and stabilizing sludge, which is especially suitable for harmless and resourceful treatment of sludge in urban sewage treatment plants. The physicochemical properties of treated sludge are greatly improved, and can be used for safe landfill or as a The landfill material and construction soil belong to the technical field of environmental engineering. Background technique [0002] In recent years, with the rapid development of my country's sewage treatment industry, the sewage treatment capacity and treatment rate have grown rapidly, and the sludge output has also increased rapidly. As of the end of September 2011, the national urban sewage treatment capacity reached 136 million cubic meters per day, and the annual production of wet sludge (with a moisture content of 80%) exceeded 34.8 million tons. According to incomplete statistics, only a small part of the sludge produced by my country's sewage treat...

Claims

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Application Information

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IPC IPC(8): C02F11/14C04B28/14
Inventor 李依丽尹晶李利平杨珊珊
Owner 北京山水青环保科技有限公司
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