Method for treating low-heating value excess sludge

A technology for excess sludge and disposal methods, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve environmental secondary pollution, occupy large land, and affect urban environment Hygiene and other issues, to achieve low energy consumption, reduce the use of the effect

Active Publication Date: 2011-09-07
北京方兴科创环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the remaining sludge is not properly treated and disposed of, it will not only occupy a large amount of land, but als

Method used

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  • Method for treating low-heating value excess sludge
  • Method for treating low-heating value excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The moisture content of excess sludge in a sewage treatment plant is 82.3%. According to the mass ratio of quicklime: excess sludge = 0.2:1, the quicklime and excess sludge are transported into the mixing reactor, fully mixed and reacted for 15 minutes, and made into semi-dry The sludge, among which, the generated odor is introduced into the waste gas treatment device for treatment. The semi-dried sludge produced by the mixed reaction is transported into the sludge granulation device, and crushed into sludge particles with a larger specific surface area. The average particle size of the sludge particles is 4.3mm, and the generated odor is introduced into the waste gas treatment device. deal with.

[0022] The outdoor temperature is 33°C during the day and 24°C at night; the temperature in the solar drying room is 56°C during the day and 24°C at night. The sludge particles are laid flat in the solar drying room. During the drying process, the sludge particles are mechan...

Embodiment 2

[0024] The moisture content of excess sludge in a sewage treatment plant is 83.6%. According to the mass ratio of quicklime: excess sludge = 0.4:1, the quicklime and excess sludge are transported into the mixing reactor, fully mixed and reacted for 20 minutes, and made into semi-dry The sludge, among which, the generated odor is introduced into the waste gas treatment device for treatment. The sludge after the mixed reaction is transported into the sludge granulation device, and the sludge particles with a larger specific surface area are produced. The average particle size of the sludge particles is 3.5mm, and the generated odor is introduced into the waste gas treatment device for treatment.

[0025] The outdoor temperature is 35°C during the day and 25°C at night; the temperature in the solar drying room is 60°C during the day and 25°C at night. The sludge particles are laid flat in the solar drying room. During the drying process, the sludge particles are mechanically turn...

Embodiment 3

[0027] The moisture content of the excess sludge in a sewage treatment plant is 83.6%. According to the mass ratio of quicklime: excess sludge = 0.5:1, the quicklime and excess sludge are transported into the mixing reactor, fully mixed and reacted for 20 minutes, and made into semi-dry The sludge, among which, the generated odor is introduced into the waste gas treatment device for treatment. The sludge after the mixed reaction is transported into the sludge granulation device, and the sludge particles with a larger specific surface area are produced. The average particle size of the sludge particles is 2.5mm, and the generated odor is introduced into the waste gas treatment device for treatment.

[0028] The outdoor temperature is 35°C during the day and 25°C at night; the temperature in the solar drying room is 60°C during the day and 25°C at night. The sludge particles are laid flat in the solar drying room. During the drying process, the sludge particles are mechanically ...

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Abstract

The invention provides a method for treating low-heating value excess sludge, which comprises the following steps of: storing calcined lime in a calcined lime storage bin, and conveying different amounts of calcined lime in an amount which is 20 to 50 percent of the mass of the excess sludge into a mixed reactor by using a reactant metering device according to requirements; conveying excess sludge to be treated with the moisture content of between 80 and 90 percent and the calcined lime into the mixed reactor, and mixing uniformly for reaction to prepare half-dried sludge; and feeding the half-dried sludge into a sludge granulating device, crushing to form sludge granules, guiding the granules into a solar drying room, drying for 24 to 48 hours to obtain dried sludge with the moisture content of between 5 and 10 percent, and introducing generated stench into a waste gas treatment device. The method has the advantages that: the aims of the innocuity and minimization of the excess sludge are fulfilled by lower energy consumption without generation of secondary pollution; and compared with that of a mode of treating the excess sludge by using the calcined lime merely, the using amount of the calcined lime can be reduced by the method.

Description

technical field [0001] The invention relates to the field of excess sludge treatment and disposal, in particular to the disposal method of excess sludge with lower calorific value. Background technique [0002] Residual sludge is the solid sediment produced in the process of sewage treatment, which contains a large amount of water, inorganic ash and organic volatiles. With the development of social economy and urbanization in our country, the generation and quantity of urban sewage are constantly increasing. At present, there are more than 500 urban sewage treatment plants in operation across the country, with an annual treatment capacity of 11.36 billion m 3 . According to relevant predictions, the amount of urban sewage in my country will increase significantly in the next two decades, and the amount of sewage discharged by the end of 2010 will reach 440×10 8 m 3 / d; In 2020, the sewage discharge will reach 536×10 8 m 3 / d. The improvement of sewage treatment effi...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/00
CPCY02W10/37
Inventor 邢奕洪晨段旭琴何永峰姜长禄
Owner 北京方兴科创环境科技有限公司
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