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Sludge substance deep dehydrating method based on thermal conditioning coupling filter pressing

A technology of deep dehydration and filter press dehydration, which is applied in pyrolysis treatment of sludge, dehydration/drying/thickened sludge treatment, etc., can solve the problem of high energy consumption in thermal drying and dehydration, and achieve avoiding a large amount of decomposition, reducing difficulty and saving energy The effect of consuming input

Active Publication Date: 2014-01-15
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] Both mechanical dehydration and thermal drying dehydration widely used at present have certain limitations. For example, mechanical dehydration is usually difficult to reduce the moisture content of sludge to below 75%, while thermal energy drying and dehydration consumes very high energy consumption, so it is very useful. It is necessary to find a high-efficiency and low-energy sludge dewatering method

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  • Sludge substance deep dehydrating method based on thermal conditioning coupling filter pressing

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Embodiment Construction

[0028] As shown in the figure, the method for deep dehydration of sludge based on thermal conditioning coupled with filter press proposed in the present invention includes the following steps:

[0029] (1) Add the sludge to the sludge pre-heat treatment unit through the sludge pump.

[0030] (2) The sludge stays in the preheat treatment unit for 30-60 minutes, and the preheated sludge is pumped into the heat conditioning treatment unit through a pump.

[0031] (3) The sludge is heated to 120-250°C in the thermal conditioning treatment unit, and stays at this temperature for 10 to 90 minutes.

[0032] (4) Before the heat conditioning treatment is completed, the filter press dehydration treatment unit is filled with air and other gases to make the air pressure higher than the saturated vapor pressure of the moisture at the corresponding temperature.

[0033] (5) Immediately transfer the sludge after the thermal conditioning reaction to the press filter dehydration treatment unit, press an...

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Abstract

The invention relates to a sludge substance deep dehydrating method based on thermal conditioning coupling filter pressing, belongs to the field of sludge treatment, is suitable for dehydration of various kinds of sludge, and particularly suitable for dehydration of surplus sludge. The method comprises the following steps: firstly carrying out heat exchange to a high temperature filtrate and the sludge, injecting the sludge with the raised temperature in a thermal conditioning processing unit, and performing a sufficient hydrothermal reaction at 120-250 DEG C; then immediately performing filter processing and dehydrating under the pressure to remove the moisture in a liquid state; at last, decompressing the high temperature sludge filter cake with pressure, further steaming and dehydrating with the sludge own high temperature and heat, so as to improve the dehydrating efficiency. The dehydrating method can improve sludge structure, physicochemical property and moisture distribution, save and fully utilize the heat, realize high-dryness and low-energy consumption dehydration of sludge, and improve the recycling value of the sludge.

Description

Technical field [0001] The invention relates to a method for deep dehydration of sludge substances based on thermal conditioning coupled pressure filtration, which is suitable for the dehydration treatment of various types of sludge, and is particularly suitable for the dehydration treatment of excess sludge, belonging to the field of sludge treatment. Background technique [0002] In view of the implementation of the Environmental Protection Regulations of the People’s Republic of China "Emission Standard of Pollutants for Urban Sewage Treatment Plants" (GB18918-2002), the amount of sewage treated by the sewage treatment plant is increasing year by year, resulting in an increase in the amount of surplus sludge produced by the sewage treatment plant , And the number is huge. According to the sewage discharge data in the "State of the Environment Bulletin of China," and considering the solid content of domestic sewage in my country at 0.015% and the average treatment efficiency of...

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Application Information

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IPC IPC(8): C02F11/12C02F11/10
Inventor 李爱民王利平
Owner DALIAN UNIV OF TECH
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