Process for treating excess sludge by utilizing fly ash

A technology of excess sludge and process method, which is applied in the directions of dehydration/drying/concentrated sludge treatment, waste treatment, energy wastewater treatment, etc., and can solve problems affecting urban environmental sanitation, environmental secondary pollution, and occupying large land, etc., to achieve The effect of small cohesive force, large permeability coefficient, and large internal friction angle

Active Publication Date: 2011-08-24
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 also cause secondary pollution to the environment and become a major public hazard affecting urban environmental sanitation.

Method used

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  • Process for treating excess sludge by utilizing fly ash
  • Process for treating excess sludge by utilizing fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The moisture content of excess sludge in a sewage treatment plant is 87.2%. According to the mass ratio of fly ash: excess sludge = 0.2:1, the fly ash and excess sludge are transported into the mixing reactor and fully mixed for 10 minutes. The mixed sludge is transported into the plate and frame filter press, and the hydraulic station provides the plate and frame filter press with a compacting pressure of 30MPa. The sludge particles are trapped in the filter chamber to form a semi-dried sludge cake, and the filtrate is collected by the collection device and returned to the sewage treatment system. The moisture content of the obtained semi-dried sludge cake was 40%.

[0021] The semi-dried sludge cake is transported into the sludge granulation device through the sludge cake conveyor, and the sludge granules with a larger specific surface area are produced, and the average particle size of the sludge granules is 3.7mm.

[0022] The outdoor temperature is 30°C during the...

Embodiment 2

[0025] The moisture content of excess sludge in a sewage treatment plant is 81.5%. According to the mass ratio of fly ash: excess sludge = 0.35:1, the fly ash and excess sludge are transported into the mixing reactor and fully mixed for 15 minutes. The mixed sludge is transported into the plate-and-frame filter press, and the hydraulic station provides a compacting pressure of 35MPa for the plate-and-frame filter press. The sludge particles are trapped in the filter chamber to form a semi-dried sludge cake, and the filtrate is collected by the collection device and returned to the sewage treatment system. The moisture content of the obtained semi-dried sludge cake was 38%.

[0026] The semi-dried sludge cake is transported into the sludge granulation device through the sludge cake conveyor, and the sludge granules with a larger specific surface area are produced, and the average particle size of the sludge granules is 3.3mm.

[0027] The outdoor temperature is 33°C during the...

Embodiment 3

[0030]The moisture content of the excess sludge in a sewage treatment plant is 90%. According to the mass ratio of fly ash: excess sludge = 0.5:1, the fly ash and excess sludge are transported into the mixing reactor and fully mixed for 5 minutes. The mixed sludge is transported into the plate-and-frame filter press, and the hydraulic station provides a compacting pressure of 35MPa for the plate-and-frame filter press. The sludge particles are trapped in the filter chamber to form a semi-dried sludge cake, and the filtrate is collected by the collection device and returned to the sewage treatment system. The moisture content of the obtained semi-dried sludge cake was 45%.

[0031] The semi-dried sludge cake is transported into the sludge granulation device through the sludge cake conveyor, and the sludge granules with a larger specific surface area are produced, and the average particle size of the sludge granules is 5mm.

[0032] The outdoor temperature is 33°C during the da...

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Abstract

The invention relates to a process for treating excess sludge by utilizing fly ash. The method specifically comprises the following steps of: 1, feeding excess sludge to be treated which has the water content of between 80 and 90 percent, and fly ash in an amount which is 20 to 50 percent based on the mass of the excess sludge into a mixing agitator; fully mixing and reacting for 5 to 15min; feeding into a plate and frame dehydrator for dehydration to obtain sludge of which the water content is reduced to be between 35 and 45 percent; crushing the sludge into coarse particles with the particle size of between 3 and 5mm by using a sludge granulation device; feeding the sludge particles into a solar drying room, and drying for 24 to 48h at the temperature of above 40 DEG C and under the humidity of below 15 percent to ensure that the water content of the sludge is reduced to between 8 and 15 percent; and treating by sludge pulverization equipment and a high-speed airflow collision technology, wherein the particle size of sludge powder is 150 to 300 meshes and the water content is 5 to 10 percent after the treatment. The method has the advantages that: interstitial water, adsorbed water and capillary bound water in the excess sludge are absorbed into the fly ash; due to the characteristic of high permeability coefficient of the fly ash, the water in the fly ash is easily discharged; and the secondary pollution to the environment is avoided by appropriately treating the excess sludge.

Description

technical field [0001] The invention relates to the field of excess sludge treatment and disposal, in particular to a process method for utilizing fly ash to dispose of excess sludge. 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 440×108 m 3 / d; in 2020, the sewage discharge volume will reach 536×108 m 3 / d. The improvement of sewage treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCY02W10/37Y02W30/20
Inventor 段旭琴邢奕洪晨姜长禄何永峰徐贵林
Owner 北京方兴科创环境科技有限公司
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