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Method for recycling urban sludge

A treatment method, the technology of urban sludge, applied in the field of resource treatment, can solve the problems of heat not being recycled, increased concentration of heavy metals in the soil, occupation of land resources, etc., to achieve the effect of promoting denitrification treatment, enhancing porosity, and operating costs low effect

Active Publication Date: 2012-11-07
JIANGDU COUNTY ENVIRONMNT PROTECTION EQUIPS FACTORY
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Problems solved by technology

However, the use of sludge in agriculture will increase the concentration of heavy metals in the soil and indirectly enter the atmosphere and water environment, thereby threatening human health; sludge landfill will occupy a large amount of land resources and cause potential environmental hazards; and sludge incineration treatment Almost all kinds of harmful substances can be removed, but the incineration of sludge requires a large amount of heat source, and most of the heat has not been recycled, the cost is high, the investment is also large, and the incineration process is accompanied by serious air pollution

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  • Method for recycling urban sludge

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[0025] In order to better understand the inventive process, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0026] Preparation of additives: the moisture content is less than 15% and has good pyrolysis performance, including but not limited to coal powder, fly ash and biomass powder.

[0027] Processing steps: see figure 1 After collecting or collecting dewatered sludge from urban sewage treatment plants with a moisture content of about 80%, it is continuously fed to the drying treatment system 1 for dehydration and drying. After drying, the moisture content of the sludge is reduced to between 40% and 60%. After crushing, it is mixed with admixture and granulated through the mixing molding system 2, so that the moisture content of the sludge granules is reduced to about 20%. Then it enters the medium-temperature carbonization system 3 to be pyrolyzed under the condition of isolating the ...

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Abstract

The invention discloses a method for recycling urban sludge, and relates to the technical fields of urban sludge treatment and recycling. The method comprises the following steps of: performing primary treatment on the sludge by using a drying system, performing secondary treatment on the produced sludge by using a mixing and forming system, adding the obtained sludge particles into a carbonization system for pyrolysis, and recycling a three-phase product produced by pyrolysis in the sewage treatment and carbonization processes for comprehensive utilization. The process steps are continuous and matched to form an integrated system, the process is simple, and the method has the advantages of good treatment effect, high broad-spectrum property, no secondary pollution, low energy consumption, capability of recycling the product for comprehensive utilization, and the like.

Description

technical field [0001] The invention relates to the technical field of municipal sludge treatment and resource treatment. Background technique [0002] In recent years, my country's urban sewage treatment business has achieved great development, which has greatly improved my country's water environment. However, the rapid increase of water treatment plants and sewage treatment volume has led to a sharp increase in the total amount of sewage sludge produced by urban sewage treatment plants in the process of sewage treatment, which has become a new threat source of environmental pollution in my country's cities. [0003] According to statistics, the main methods of sewage sludge disposal in urban sewage treatment plants in my country are agricultural utilization, landfill, and other disposal (including incineration), and the investment in sludge treatment and disposal accounts for about 20% of the total investment in sewage treatment plants. 50%, far below the level of 70% in ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/10
CPCY02W10/40
Inventor 虞荣松李小敏吴增跃
Owner JIANGDU COUNTY ENVIRONMNT PROTECTION EQUIPS FACTORY
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