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Heat-free sludge drying method and device system thereof

A sludge and drying technology, used in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as unbearable treatment costs, odor and dust generation, and limited application scope. Achieve significant energy-saving effect, reduce water viscosity, and avoid secondary pollution.

Inactive Publication Date: 2020-05-15
秦皇岛尼科环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Among these drying methods, hot water drying method, steam drying method, and kiln flue gas waste heat drying method use the waste heat generated in the production process of enterprises to dry sludge, so their application range is limited
The gas drying method is to use the by-products of petrochemical enterprises with abundant natural gas and coal enterprises with abundant gas to provide heat source to dry the sludge, and its application range is also limited
The solar drying method is suitable for areas with vast land, sparsely populated areas, strong sunshine, and dry climate, and it cannot be applied to most towns
The electric energy drying method has the best applicability, but it consumes a lot of energy. Even if the air source heat pump with high energy conversion efficiency is used, the processing cost is still unbearable.
Moreover, these thermal drying methods have a common problem: secondary pollution is serious, and odor and dust are generated during the treatment process, which is one of the most important factors limiting the application of thermal drying methods

Method used

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  • Heat-free sludge drying method and device system thereof
  • Heat-free sludge drying method and device system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The excess sludge of a city sewage treatment plant has a water content of 81.2%, an organic matter content of 49.5% (dry weight), and protein content in extracellular polymers is greater than sugar content. Add 20 kg of chemical conditioner and 50 kg of physical conditioner per ton of sludge. The composition of the chemical conditioner is: cationic polyacrylamide 15%, cetyltrimethylammonium bromide 15%, polyaluminum chloride 10%, TS-01 dehydrating agent 60%; the physical conditioner is 10% water content Sawdust; Stir evenly with a mixer and send it to the reaction tank for 20 minutes; then send it to the all-round water press for 10 minutes, the moisture content of the mud cake is 56%; crush the mud cake, the particle size is not more than 30mm, and then send it to the air-dried In the warehouse, stay for 24 hours to obtain a dry product with a moisture content of 39.6%.

Embodiment 2

[0046] The sludge of an urban sludge centralized treatment plant comes from 5 domestic sewage treatment plants in the urban area. The mixed sludge has a moisture content of 83.1%, an organic matter content of 52.2% (dry weight), and a protein content of extracellular polymer greater than the sugar content. Add 19 kg of chemical conditioner and 48 kg of physical conditioner per ton of sludge. The composition of the chemical conditioner is: cationic polyacrylamide 12%, cetyltrimethylammonium bromide 13%, polyaluminum chloride 10%, TS-01 dehydrating agent 65%; the physical conditioner is 11% water content Straw crushed particles; stir evenly with a mixer and send it to the reaction tank for 20 minutes; then send it to the all-round water press for 10 minutes, the moisture content of the mud cake is 53%; crush the mud cake, the particle size is not greater than 30mm, and then send Put it into the air-drying storehouse and stay for 24 hours to obtain a dried product with a moistur...

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Abstract

The invention discloses a heat-free sludge drying method and a device system thereof. The heat-free sludge drying method comprises the following technological steps: 1, sludge to be treated is conveyed into a stirring machine, a chemical conditioner and a physical conditioner are added, and mixing is performed until uniformity; (2) the uniformly mixed sludge is conveyed into a reaction tank, and stays for a certain time to ensure sufficient reaction; (3) after the reaction is completed, the sludge enters a squeezing device and is rapidly dehydrated; (4) the dehydrated mud cake enters a crusherand is crushed; (5) the crushed mud cake enters a drying bin and undergoes forced ventilation drying; and (6) the generated sewage enters a water treatment device and is treated. The dehydration process is short in time, and heating is not needed in the drying process; and the method has the advantages of high treatment efficiency, low energy consumption, low treatment cost, no secondary pollution and the like. The moisture content of the dried sludge cake is 20-40% and is adjustable, and the import requirements of various sludge final treatment processes can be met.

Description

technical field [0001] The invention relates to a heatless drying method for sludge treatment and a device system thereof, belonging to the technical field of sludge deep dehydration and drying. Background technique [0002] Sludge, especially the excess sludge produced by urban sewage treatment plants, has the characteristics of high water content, high organic matter content, difficult dehydration, easy corruption and odor, etc. If it is not handled properly, it will cause serious secondary pollution. common environmental problems. The core issue of sludge treatment is dehydration. Only when the moisture content of sludge is reduced to a certain level can subsequent final disposal, such as incineration, pyrolysis, composting, landfill, etc. be carried out. The water content of the excess sludge produced by the sewage treatment plant is 80-85%. The water content can be reduced to 50-60% by pressure dehydration treatment, and the water content can be reduced to 20-60% by he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/121C02F11/14C02F11/12
CPCC02F11/12C02F11/14
Inventor 张晓春
Owner 秦皇岛尼科环境科技有限公司
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