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Method for treating excess sludge

A technology for excess sludge and treatment methods, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve problems affecting urban environmental sanitation, large land occupation, and environmental secondary Pollution and other issues, to achieve the effect of final disposal

Active Publication Date: 2013-01-30
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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  • Method for treating excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The moisture content of the excess sludge taken from a sewage treatment plant is 85.2%, and it is transported into the plate and frame filter press, and the hydraulic station provides the plate and frame filter press with a pressing pressure of 25MPa. The sludge particles are trapped in the filter chamber to form 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 43.7%. The semi-dried sludge cake is transported into the sludge granulation device through the mud cake conveyor, and the average particle size of the sludge particles is 3.8mm.

[0017] The sludge particles are laid flat in the thermal drying room, and the metallurgical sintering flue gas with a temperature of about 150°C is introduced. During the drying process, mechanically turning the sludge particles is used to accelerate the drying, and at the same time, the humidity i...

Embodiment 2

[0019] The excess sludge taken from a sewage treatment plant with a moisture content of 82.6% is transported into the plate and frame filter press, and the hydraulic station provides the plate and frame filter press with a pressing pressure of 35MPa. The sludge particles are trapped in the filter chamber to form 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 41.5%. The semi-dried sludge cake is transported into the sludge granulation device through the mud cake conveyor, and the average particle size of the sludge particles is 4.3 mm.

[0020] The sludge particles are laid flat in the thermal drying room, and the temperature of the metallurgical sintering flue gas introduced is about 100 °C. During the drying process, mechanically turning the sludge particles is used to accelerate the drying, and at the same time, the humidity in the the...

Embodiment 3

[0022] The excess sludge from a sewage treatment plant with a moisture content of 82.6% is transported to the plate and frame filter press, and the hydraulic station provides the plate and frame filter press with a pressing pressure of 45MPa. The sludge particles are trapped in the filter chamber to form 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 41.5%. The semi-dried sludge cake is transported into the sludge granulation device through the mud cake conveyor, and the average particle size of the sludge particles is 4.3mm.

[0023] The sludge particles are laid flat in the thermal drying room, and the temperature of the incoming metallurgical sintering flue gas is about 180°C. During the drying process, mechanically turning the sludge particles is used to accelerate the drying, and at the same time, the humidity in the thermal drying ...

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Abstract

The invention discloses a method for treating excess sludge. The excess sludge is dried by utilizing sintering flue gas which is discharged in a metallurgical sintering process and has higher temperature. The method specifically comprises the following steps of: feeding excess sludge to be treated which has the water content of between 80 and 90 percent into a plate and frame filter press, dehydrating under the pressure of between 25 and 45MPa to obtain a filter-pressed dehydrated sludge cake with the water content of between 40 and 55 percent, feeding the sludge cake into a sludge granulation device to crush into coarse particles with the particle size of about between 3 and 5mm, introducing the particles into a thermal energy drying room, introducing flue gas which is discharged in the metallurgical sintering process and has the temperature of between 100 and 180 DEG C into the thermal energy drying room, and drying the sludge particles, wherein the calorific value of the dried sludge is 2,000 to 4,000 kilocalories and the water content is 5 to 10 percent. The method has the advantages that: the waste heat in the sintering flue gas in iron and steel metallurgical industry is effectively utilized, the dehydration of the excess sludge is reduced, the excess sludge with a higher calorific value is taken as fuel to be added into a sintering working procedure, and the final treatment of the excess sludge is realized.

Description

technical field [0001] The invention relates to the field of excess sludge treatment and disposal, in particular to a method for the treatment of excess sludge combined with a metallurgical sintering process. Background technique [0002] Excess sludge is a solid precipitated material produced during sewage treatment, which contains a large amount of water, inorganic ash and organic volatiles. With the development of my country's social economy and urbanization, the production and quantity of urban sewage is 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 m3 3 . According to relevant forecasts, the amount of urban sewage in my country will continue to grow significantly in the next two decades, and the discharge of sewage will reach 440×108 m by the end of 2010. 3 / d; sewage discharge will reach 536×108 m in 2020 3 / d. The improvement of sewage treatment eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/12C10L5/46
CPCY02E50/30Y02E50/10
Inventor 邢奕洪晨段旭琴何永峰王路敏姜长禄
Owner 北京方兴科创环境科技有限公司
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