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Method for dehydrating municipal sludge

A technology for municipal sludge and sludge, applied in pyrolysis treatment of sludge, chemical instruments and methods, dehydration/drying/thickened sludge treatment, etc., can solve problems such as low dehydration rate, secondary pollution, and poor sanitary conditions , to achieve the effect of improving dehydration performance and saving energy

Inactive Publication Date: 2009-12-02
广东奥美特集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and easy to manage, but it occupies a large area, takes a long time, is greatly affected by the climate, and has poor sanitary conditions. It is not effective for some sludge that is not easy to dehydrate.
Mechanical dehydration is the use of mechanical pressure to squeeze out the interstitial water in the sludge. The dehydration rate of this method is low, and the moisture content of the sludge is as high as 70% to 80%. Secondary pollution requires secondary dehydration
Evaporation and drying dehydration uses heating to evaporate the sludge water. This method has a high dehydration rate and the moisture content of the sludge is below 40%, but it consumes a lot of energy, invests a lot, occupies a large area, and has high operating costs.
Chemical agent dehydration uses agents to destroy the detached structure, reduce the affinity between mud and water, and improve the sludge concentration and dehydration performance. This method has a better dehydration effect, and the moisture content of the sludge is below 40%, but the agent cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Put municipal sludge with a moisture content of 80% into a sealed reactor, and pyrolyze the sludge at a low temperature of 60°C for 1 hour to destroy the water-holding structure of solid substances such as organic polymers and colloidal flocs, and greatly improve the sludge Dehydration performance;

[0015] (2) natural drying or blast drying of the municipal sludge after the above-mentioned low-temperature pyrolysis for 6 hours, and the moisture content of the sludge is reduced from 80% to 10%;

[0016] (3) The dried sludge is evenly mixed with the chemical activator potassium hydroxide 25:1~5, dehydrated at 300°C for 30 minutes, activated at 500°C for 60 minutes, washed and dried to obtain a high-performance adsorption material.

Embodiment 2

[0018] (1) Put municipal sludge with a moisture content of 70% into a sealed reactor, and pyrolyze the sludge at a low temperature of 80°C for 2 hours to destroy the water-holding structure of solid substances such as organic polymers and colloidal flocs, and greatly improve the sludge Dehydration performance;

[0019] (2) Naturally drying or blast drying the urban sludge after the above-mentioned low-temperature pyrolysis for 6 hours, and the moisture content of the sludge is reduced from 70% to below 2%;

[0020] (3) The dried sludge is evenly mixed with the chemical activator zinc chloride 25:1~5, dehydrated at 500°C for 30 minutes, activated at 900°C for 60 minutes, pickled and dried to obtain a high-performance adsorption material.

Embodiment 3

[0022] (1) Put municipal sludge with a water content of 80% into a sealed reactor, and pyrolyze the sludge at a low temperature of 80°C for 1.5 hours to destroy the water-holding structure of solid substances such as organic polymers and colloidal flocs, and greatly improve the sludge Dehydration performance;

[0023] (2) natural drying or blast drying of the municipal sludge after the above-mentioned low-temperature pyrolysis for 6 hours, and the moisture content of the sludge is reduced from 80% to below 7%;

[0024] (3) The dried sludge is evenly mixed with chemical activator phosphoric acid 25:1~5, dehydrated at 400°C for 30 minutes at low temperature, activated at 700°C for 60 minutes at high temperature, washed with water and dried to obtain a high-performance adsorption material.

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Abstract

The invention relates to a method for dehydrating municipal sludge, which comprises the following steps: putting the municipal sludge into a sealed reactor, and pyrolyzing the sludge for 1 to 2 hours at a low temperature of between 60 and 80 DEG C; drying the municipal sludge after the low-temperature pyrolysis naturally or drying the same by blasting for 6 hours so that the moisture content of the municipal sludge is reduced to be less than 10 percent; evenly mixing the dried sludge with a chemical activating agent according to the weight ratio of 25:1-5, dehydrating the sludge for 30 minutes at a lower temperature of between 300 and 500 DEG C, and activating the sludge for 60 minutes at a high temperature of between 500 and 900 DEG C; and performing rinsing or acid cleaning on the sludge, and drying the sludge to prepare a high-performance adsorbing material as an environmental material for controlling sewage. The method is environment-friendly and energy-saving.

Description

technical field [0001] The invention relates to a sludge resource treatment technology, in particular to a municipal sludge dehydration method. technical background [0002] The sludge produced after the treatment of production and domestic wastewater has a high water content. In order to reduce and recycle the sludge, sludge dehydration must be carried out first. At present, the methods of sludge dehydration mainly include natural evaporation method, mechanical dehydration method, evaporation drying method and chemical agent dehydration method. The natural evaporation method is to spread the sludge into a thin layer on the sludge drying field, part of the water contained in the sludge evaporates naturally, and part of it infiltrates into the soil or the water filter layer. This method is simple and easy to manage, but it occupies a large area, takes a long time, is greatly affected by the climate, and has poor sanitation conditions, and is not effective for some sludge tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/10B01J20/00B01J20/30
Inventor 林春涛
Owner 广东奥美特集团有限公司
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