Treatment method of high calorific value excess sludge

A technology of excess sludge and disposal method, applied in dewatering/drying/concentrating sludge treatment, combustion method, lighting and heating equipment, etc. Achieve the effect of saving energy consumption and avoiding secondary pollution

Active Publication Date: 2011-09-14
北京方兴科创环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Treatment method of high calorific value excess sludge
  • Treatment method of high calorific value excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The moisture content of the remaining sludge in a sewage treatment plant is 86.2%, and it is sent to the plate and frame filter press, and the hydraulic station provides the plate and frame filter press with a compression pressure of 25MPa. 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 50.7%. 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. The sludge particles are further dried in the thermal energy drying room. The temperature of the flue gas used for drying is 550°C. After drying, the moisture content of the sludge particles drops to 30.5%. Afterwards, the sludge part...

Embodiment 2

[0020] The moisture content of the remaining sludge in a sewage treatment plant is 84.3%, and it is sent to the plate and frame filter press, and the hydraulic station provides the plate and frame filter press with a compression pressure of 28MPa. 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 56.9%. 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 4.3mm. The sludge particles are further dried in the thermal energy drying room. The temperature of the flue gas used for drying is 465°C. After drying, the moisture content of the sludge particles drops to 30.5%. Afterwards, the sludge part...

Embodiment 3

[0022] The moisture content of the remaining sludge in a sewage treatment plant is 80.6%, and it is sent to the plate and frame filter press, and the hydraulic station provides a compacting pressure of 45MPa 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 45.4%. 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 4.1mm. The sludge particles are further dried in the thermal energy drying room. The temperature of the flue gas used for drying is 600°C. After drying, the moisture content of the sludge particles drops to 26.2%. Afterwards, the sludge partic...

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Abstract

The invention provides a treatment method of high calorific value excess sludge. The method comprises the following steps of: feeding the excess sludge to be treated with moisture content of 80 to 90 percent into a plate-and-frame water filter press for dehydration to obtain a filter-pressing dehydrated sludge cake; feeding the obtained sludge cake into a sludge granulation device; crushing the sludge cake into coarse granules at normal temperature; further drying the sludge granules in a heat energy drying room; feeding the dried sludge granules into sludge powdering equipment for further treatment, wherein the grain diameter of the treated sludge powder is 150 to 300 meshes, and the water ratio is 5 to 15 percent; storing sludge dried powder into a sludge dried powder warehouse, and spraying the sludge powder having small grain diameter and having a calorific value of 2,000 to 4,000 kilocalories into a sludge burning furnace to completely burn with a small amount of fuels or without the fuels, wherein the interior temperature of the burning furnace is 800 to 1,000 DEG C, and secondary pollution is avoided; and then conducting high-temperature fume which is generated by burning into a waste heat drying device, and drying the sludge. By the process, the burning treatment of the sludge can be performed conveniently, the energy consumption of sludge drying is reduced, the excess sludge is treated properly, and the secondary environmental pollution is avoided.

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 relatively high 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 440×108 m 3 / d; in 2020, the sewage discharge volume will reach 536×108 m 3 / d. The improvement of sewage tre...

Claims

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Application Information

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IPC IPC(8): F23G7/00C02F11/12
Inventor 邢奕洪晨段旭琴何永峰徐贵林姜长禄
Owner 北京方兴科创环境科技有限公司
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