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A rapid dehydration and drying system for excess sludge

A rapid dehydration technology for excess sludge, applied in sludge detoxification, water/sludge/sewage treatment, sludge treatment, etc., can solve problems such as inability to speed up drying efficiency, high operating cost, and complex equipment structure

Active Publication Date: 2022-05-03
徐丹
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method virtually adds conditioners such as calcium oxide and iron salts to the sludge, which increases the cost and the risk of secondary pollution
[0005] CN108585392A discloses a high-pressure discharge type biochemical sludge conditioning method. The sludge is placed in a closed container, and then the internal pressure of the container is increased by means of pressurization. After the pressure rises to the rated value, within an extreme time Complete pressure relief, relying on the gas expansion and shock shock generated at the moment of pressure relief, the microbial cells in the sludge can be broken and sludge conditioning can be achieved, but this method only achieves pressure relief in an extreme time, making the microbial cells Achieving wall breaking does not speed up its drying efficiency; CN206736061U is a sludge low-temperature continuous flash drying tower, which realizes rapid sludge drying at low temperature, but its equipment structure is complex and its operating cost is high

Method used

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  • A rapid dehydration and drying system for excess sludge
  • A rapid dehydration and drying system for excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Transfer the excess sludge to the high temperature pressure tank for heating;

[0039] 2) When the temperature is ≥ 230 degrees Celsius and the pressure is ≥ 5 bar, the solenoid valve is opened, and the slurry in the high-temperature pressure tank is instantly sprayed into the drying tank, and the slurry is sprayed in the drying tank. And on the outer sieve barrel, the sludge is dispersed on the sieve barrel, the water evaporates, and the sludge is dried;

[0040] 3) When the pressure in the drying tank exceeds the threshold value of 4 bar, the pressure valve opens to discharge the water vapor;

[0041] 4) Turn on the mud scraping device, and the mud scraping component starts to scrape mud;

[0042] 5) After scraping the sludge, the screw conveyor arranged at the bottom of the drying tank transports the dried sludge to the outside of the tank body.

[0043] The moisture content of excess sludge before treatment is 95%, and the moisture content is reduced to 30-35% ...

Embodiment 2

[0045] On the basis of Example 1,

[0046] Before step (1), the excess sludge is firstly transported to the dehydration device 5 for pre-dehydration, and the moisture content of the pre-dehydrated sludge is 80-90%; The water vapor discharge port in the drying tank is connected to the preconditioning tank 4, and the water vapor in the preconditioning tank 4 preheats the excess sludge to 60°C.

[0047] The moisture content of excess sludge before treatment is 95%, and the moisture content is reduced to 25-30% after treatment.

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Abstract

The invention discloses a rapid dehydration and drying system for excess sludge. After the cell structure in the excess sludge undergoes steam modulation, high temperature and high pressure, and pressure relief burst, due to protein denaturation and cell structure rupture, the process of realizing sludge drying At the same time, it can effectively kill such harmful microorganisms or viruses.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a rapid dewatering and drying system for excess sludge. Background technique [0002] The residual sludge has a high moisture content (generally greater than 95%) and a large volume, which is not conducive to storage, transportation and consumption. The reduction is very important. The volume of biological sludge decreases greatly with the decrease of the moisture content. More than 85% of the sludge can be pumped, the sludge with a moisture content of 70-75% is ooze, while the sludge with a moisture content of 60-65% is almost solid, and 35-40% can be discrete. 10-15% sludge is in powder state. [0003] The sludge contains a large number of pathogenic bacteria, parasite eggs and viruses, which can easily cause the spread of diseases. However, the sludge in my country's sewage treatment plants is largely untreated and directly used in agriculture. Even sewage treatme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/131C02F11/00C02F11/121
CPCC02F11/131C02F11/004C02F11/121
Inventor 苏华汤亚勇樊晓瑜
Owner 徐丹