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Sludge heat treatment recycling process

A sludge and process technology, applied in the field of sludge heat treatment and reuse process, can solve the problems of short development time of hydrothermal carbonization technology, and achieve the effects of increasing SCOD content, developing pores, and improving physical and chemical properties

Pending Publication Date: 2020-08-14
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development time of hydrothermal carbonization technology is short, and there is still a lot of room for improvement in terms of process performance such as processing efficiency, carbon soil solid content, yield, carbon soil performance, energy utilization rate, device reliability, and automation.

Method used

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  • Sludge heat treatment recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A sludge heat treatment and reuse process, comprising the following steps:

[0046] S1, Sludge preheating: Preliminary dehydration is carried out after the sludge is filtered through an 8mm fence. After dehydration, the sludge is continuously introduced into the feeding unit, and the sludge is repeatedly heat-exchanged to 31.5°C by the external filtrate of the feeding unit;

[0047] S2, heat treatment: the preheated sludge enters the heat treatment unit through the feed unit, and the temperature reaches 98°C for heat treatment; the oxygen content in the heat treatment process is 10%; the dust concentration is less than 65mg / m 3 .

[0048] S3, cooling: the heat-treated sludge flows to the cooling zone, and the sludge cooling speed and time are determined according to the properties of the sludge and the requirements for the moisture content of the dewatered sludge;

[0049] S4, dehydration: mix the fibrous material with a dehydrating agent, stir the obtained mixture, pr...

Embodiment 2

[0056] A sludge heat treatment and reuse process, comprising the following steps:

[0057] S1, sludge preheating: the sludge is preliminarily dehydrated after being filtered through a 6mm fence. After dehydration, the sludge is continuously introduced into the feeding unit, and the sludge is heated to 30°C by the external filtrate of the feeding unit for many times;

[0058] S2, heat treatment: the preheated sludge enters the heat treatment unit through the feed unit, and the temperature reaches 73°C for heat treatment;

[0059] S3, cooling: the heat-treated sludge flows to the cooling zone, and the sludge cooling speed and time are determined according to the properties of the sludge and the requirements for the moisture content of the dewatered sludge;

[0060] S4, dehydration: mixing the fibrous material with a dehydrating agent, stirring the obtained mixture, and dehydrating by pressing until the moisture content of the mixture is reduced to 34% by weight;

[0061] S5, co...

Embodiment 3

[0067] A sludge heat treatment and reuse process, comprising the following steps:

[0068] S1, sludge preheating: the sludge is preliminarily dehydrated after being filtered through a 10mm fence. After dehydration, the sludge is continuously introduced into the feeding unit, and the sludge is heated to 60°C by the external filtrate of the feeding unit for many times;

[0069] S2, heat treatment: the preheated sludge enters the heat treatment unit through the feed unit, and the temperature reaches 174°C for heat treatment; the oxygen content in the heat treatment process is 12%; the dust concentration is 67.8mg / m3.

[0070] S3, cooling: the heat-treated sludge flows to the cooling zone, and the sludge cooling speed and time are determined according to the properties of the sludge and the requirements for the moisture content of the dewatered sludge;

[0071] S4, dehydration: mix the fibrous material with a dehydrating agent, stir the obtained mixture, press and dehydrate until ...

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Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to a sludge heat treatment recycling process which comprises the following steps: S1, preheating sludge, S2,carrying out heat treatment, S3, cooling, S4, dehydrating, and S5, carrying out compression molding. According to the sludge heat treatment recycling process, the sludge is deeply dewatered, the effects of disintegrating the sludge and improving organic matter dissolution can be achieved, and therefore the phosphorus release capacity of the sludge is improved, the pH value of a sludge system aftertreatment is 7, a treatment container is not corroded, and the salinity in the system cannot be improved. The process can be used for effectively sterilizing, killing germs in sludge and inhibiting fermentation microorganisms from generating a large amount of acidic biogas, so that pipeline equipment is corroded and damaged, and the burst risk caused by more biogas is avoided.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a sludge heat treatment and reuse process. Background technique [0002] In the process of rural sludge treatment, after being dehydrated by a centrifugal dehydrator, an extremely complex heterogeneous sludge composed of organic debris, bacterial cells, inorganic particles, colloids, etc. is obtained with a solid content of 10% to 20%. When the sludge is dewatered, it is difficult to dehydrate the bound water and interstitial water in the sludge. Due to the high water content of the fine sludge, the leachate collection system and drainage pipes are often blocked; in addition, the high water content of the sludge makes the rheology of the sludge make the landfill easy to deform and landslide. [0003] In the existing high-temperature and high-pressure thermal hydrolysis pretreatment technology, there are mainly two routes, one is 60℃~170℃ thermal hydrolysis +...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/18C02F11/00C10L5/46
CPCC02F11/10C02F11/18C02F11/004C10L5/46C02F2209/06Y02E50/30Y02E50/10
Inventor 赵文玉晏永祥刘志华刘梦月卿志和蒋朝晖刘春华
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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