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Method for compounding and directly pyrolyzing sludge

A sludge, direct technology, applied in the field of high-efficiency thermochemical disposal of organic solid waste and environmental protection, to achieve the effect of wide application, simplified process flow and reduced energy consumption

Inactive Publication Date: 2017-02-15
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the deficiencies of the existing sludge disposal methods, and propose a method of sludge compounding and direct pyrolysis

Method used

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  • Method for compounding and directly pyrolyzing sludge

Examples

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Effect test

Embodiment 1

[0017] The dewatered sludge in the present embodiment is taken from Nanjing Chengbei Sewage Treatment Plant (same as the following examples), and the water content mass ratio of the treated sludge is 50%, the water content mass ratio of pine branches is 20%, and the average particle size is 2mm. The curing agent is attapulgite, the particle size is 20 mesh, and the mass ratio of silicon to aluminum is 60%. Mix the sludge, biomass and attapulgite evenly according to the ratio of 77%: 20%: 3%, put it into the pyrolysis furnace, raise the temperature to 500°C, keep it for 30 minutes, and then further rise to the pyrolysis temperature of 900°C, keep it 10min.

[0018] The heavy metal ions contained in the sludge are Ba, Cr, Co, Ni, Cu, Mn, Cd, Pb, and the content and form of heavy metals in the residue after pyrolysis are detected by ICP and XRD respectively. According to the concentration of heavy metals in the solid phase Residue rate and degree of morphological conversion were...

Embodiment 2

[0021] In this example, the water content of the treated sludge is 60%, the water content of pine branches is 17%, the average particle size is 4mm, the curing agent is attapulgite, the particle size is 15 mesh, and the silicon-aluminum mass ratio is 80%. Mix the sludge, biomass and attapulgite according to the ratio of 75%: 20%: 5%, put it into the pyrolysis furnace, raise the temperature to 550°C, keep it for 30 minutes, and then further raise it to the pyrolysis temperature of 1200°C, keep it 15min. According to the ICP result of table 1, compared with embodiment 1, the residual rate of each heavy metal ion in the solid phase all increases to some extent, and this shows that along with the bigger of curing agent ratio, the raising of pyrolysis temperature, the concentration of heavy metal The degree of curing is also relatively improved. The XRD results of solid phase residues showed that the degree of form transformation of heavy metals also increased, which may be the re...

Embodiment 3

[0023] In this embodiment, the moisture content of the treated sludge is 80%, the moisture content of pine branches is 15%, the average particle size is 6mm, the curing agent is kaolin, the particle size is 13 mesh, and the mass ratio of silicon to aluminum is 60%. Mix the sludge, biomass and kaolin evenly according to the ratio of 70%: 24%: 6%, put them into the pyrolysis furnace, raise the temperature to 600°C, keep it for 25min, and then further raise the pyrolysis temperature to 850°C, and keep it for 20min. According to the ICP result of table 1, it can be seen that compared with Example 2, the residual rate of each heavy metal ion in the solid phase has been reduced, but compared with Example 1, it has been increased, which shows that although the curing agent ratio However, the reduction of pyrolysis temperature will also reduce the residual rate of heavy metals in the solid phase. At the same time, the XRD results of the solid phase residue also showed that the form tr...

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Abstract

The invention relates to a method for compounding and directly pyrolyzing sludge. The method is characterized by comprising the following steps of adding a curing agent and biomass into the sludge to carry out co-pyrolysis, wherein the mass percent of the cuing agent is 3 to 10 percent, the mass percent of the biomass is 20 to 30 percent, and the mass percent of the sludge is 60 to 77 percent; uniformly agitating the sludge, the biomass and the curing agent, which are mixed according to a certain proportion, then putting an obtained mixture into a pyrolyzing furnace, raising temperature to 500 to 700 DEG C, preserving heat for 20min to 30min, then further raising the temperature to a pyrolysis temperature of 800 to 1200 DEG C, preserving the heat for 10min to 20min, and completing the drying, the gasification and the cracking of raw materials at the same time. The method for compounding and directly pyrolyzing the sludge is wide in scope of application, and has low requirements on the types and the water content of the sludge; the harmless disposal and the resource utilization of the sludge can be realized in a more broad-spectrum manner.

Description

technical field [0001] The invention relates to a sludge compounding and direct pyrolysis method, which belongs to the fields of high-efficiency thermochemical disposal of organic solid waste and environmental protection. Background technique [0002] In the process of sewage treatment, most of the pollutants are transferred to the sludge, including various heavy metals, harmful organic substances and pathogens, etc., and it is easy to form secondary pollution in the further disposal process, especially heavy metal pollution. After preliminary dehydration by plate-and-frame filter press, the water mass ratio of the sludge is generally still about 80%. Most sludge disposal methods require the water content mass ratio to be reduced to below 20%, and the drying energy consumption is large. Therefore, how to realize the efficient disposal of sludge and the utilization of energy resources is an urgent problem to be solved. [0003] For heavy metals, the traditional treatment met...

Claims

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Application Information

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IPC IPC(8): C02F11/10C10J3/00
CPCC10J3/00C02F11/10C10J2300/0923C10J2300/092C10J2300/0976C10J2300/0909Y02W10/40
Inventor 杨丽朱锦娇陈海军朱跃钊
Owner NANJING UNIV OF TECH
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