Hydrothermal treatment method of municipal sludge

A hydrothermal treatment and municipal sludge technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the deterioration of sludge dewatering performance and increase the solid content of dewatered sludge rate, low organic matter removal rate, etc.

Inactive Publication Date: 2014-02-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only using hydrothermal treatment, the removal rate of organic matter in sludge is low (only about 40%). Therefore, some studies have added NaOH or KOH to sludge for alkali-assisted hydrothermal treatment to improve the removal of organic matter in sludge. Rate
However, although the removal rate of organic matter in the sludge is improved to a certain extent after adding NaOH or KOH, the dewatering performance of the sludge deteriorates sharply, and it is necessary to rely on the addition of coagulants and flocculants (such as AlCl 3 and polyacrylamide) to improve the dewatering performance of sludge, which not only forms sediment, increases the solid content of dewatered sludge, but also increases the treatment cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 50 tons of urban sludge with a solid content of 0.8%; after concentrating the sludge, 8 tons of wet sludge were obtained with a solid content of 5%, a solid content of 0.4 tons, and an organic solid content of 0.3 tons. Add 0.08 tons of solid CaO (mass is 20% of the solid content of the sludge) to the wet sludge, conduct a hydrothermal reaction at 250°C for 2 hours, and then exchange heat with the sludge to be treated, so that the temperature of the sludge after hydrothermal treatment Reduce to 50°C, then enter the plate and frame filter press dehydration equipment for dehydration for 10 minutes, and obtain 0.53 tons of dewatered sludge with a solid content rate of 30%, a solid content of 0.16 tons, an organic solid content of 0.02 tons, and an organic solid removal rate of 93%. .

Embodiment 2

[0037] 50 tons of sludge from a certain city, with a solid content of 0.8%; 8 tons of wet sludge were obtained after concentration and dehydration of the sludge, with a solid content of 5%, a solid content of 0.4 tons, and an organic solid content of 0.3 tons. Add 0.004 tons of solid Mg(OH) to wet sludge 2 (The mass is 1% of the solid content of the sludge), conduct a hydrothermal reaction at 250°C for 10 minutes, and then exchange heat with the sludge to be treated to reduce the temperature of the sludge to 60°C after hydroheating, and then enter the plate and frame filter press for dehydration The equipment was dehydrated for 10 minutes to obtain 0.44 tons of dewatered sludge with a solid content rate of 32%, a solid content of 0.14 tons, an organic solid content of 0.04 tons, and an organic solid removal rate of 87%.

Embodiment 3

[0039] 50 tons of sludge from a certain city, with a solid content of 0.8%; after concentrating and dehydrating the sludge, 13.3 tons of wet sludge were obtained, with a solid content of 3%, a solid content of 0.4 tons, and an organic solid content of 0.3 tons. Add 0.2 tons of solid Ca(OH) to the wet sludge 2 (The mass is 50% of the solid content of the sludge), conduct a hydrothermal reaction at 150°C for 60 minutes, and then exchange heat with the sludge to be treated to reduce the temperature of the sludge to 40°C after hydroheating, and then enter the plate and frame filter press for dehydration The equipment was dehydrated for 10 minutes to obtain 0.62 tons of dewatered sludge with a solid content of 40%, a solid content of 0.25 tons, an organic solid content of 0.05 tons, and an organic solid removal rate of 83%.

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Abstract

The invention relates to a hydrothermal treatment method of municipal sludge. The method comprises the following steps: 1, adding a medicine to sludge, and reacting at 120-300DEG C for 1min-5h, wherein the medicine is one or more of calcium hydrate, calcium oxide and magnesium hydroxide, and the addition mass of the medicine is 0.01-1 if the mass of solids in the sludge is 1; and 2, dehydrating the sludge obtained in step 1. By adopting the method to process the municipal sludge, the removal rate of organic matters in the sludge is high, and the dehydration performance of the sludge is good.

Description

technical field [0001] The invention relates to a hydrothermal treatment method for urban sludge. Background technique [0002] Sludge is an inevitable product of sewage treatment. During the "Eleventh Five-Year Plan" period, while the construction of sewage treatment plants and the volume of sewage treatment increased, it also brought about a substantial increase in the amount of sludge. According to reports, there are currently more than 2,000 sewage plants in operation in my country, with a daily water treatment capacity of more than 80 million cubic meters. Assuming that sludge (water content 98% by mass) accounts for 0.6% by mass of sewage, the daily output of sludge is 480,000 cubic meters. During the "Twelfth Five-Year Plan" period, as a large number of sewage treatment plants under construction are put into operation, the average annual increase of sludge in urban sewage treatment plants will reach 15% by mass. [0003] The sludge produced by the sewage treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14
Inventor 张超崔龙鹏桑军强
Owner CHINA PETROLEUM & CHEM CORP
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