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Low-energy drying treatment method for discharged sludge

A treatment method and sludge technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc.

Inactive Publication Date: 2011-11-23
唐菊香 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the situation at home and abroad, there is currently no practical method to reduce the sludge dehydration to below 60%.

Method used

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Embodiment Construction

[0027] Such as figure 1 As shown, the sludge treatment method of the present invention reduces the water content of 80% of the factory sludge to 20-30% in four steps, and makes mud cakes.

[0028] The first step: the physical cracking process is realized through the following scheme:

[0029] Mix the sludge and water in the first reaction tank with a weight ratio of 1:0.6 to 1.2 for 6 to 20 minutes, and the rotation speed is 120 rpm. Stir in the middle spiral for 6 minutes, or in the first reaction tank at a weight ratio of 1:1 for 10 minutes, or in the reaction tank at a weight ratio of 1:1.2 for 20 minutes, the amount of water to be added is mainly determined according to the composition of the sludge Specific gravity and stirring time;

[0030] The second step: chemical conditioning and modification process, the sludge that has undergone physical cracking in the first step is sent to the second reaction tank to add the following chemicals:

[0031] (a) PH value adjustmen...

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Abstract

The invention discloses a low-energy drying treatment method for discharged sludge. The method comprises the following steps: after adding water into discharged sludge in a first reaction tank so as to carry out physical degradation on the discharged sludge and then uniformly stirring the obtained mixture completely, conveying the obtained discharged sludge with water content of 80% to a second reaction tank; adding a chemical reagent into the second reaction tank so as to carry out chemical conditioning and modification on the discharged sludge, then carrying out mechanical filter pressing on the sludge so as to reduce the water content of the sludge to 40-45%, and preparing the sludge into mud cakes; and ventilating and drying the mud cakes in a greenhouse shed so as to reduce the content content of the sludge to 20-30%. The method disclosed by the invention is suitable to be applied to the reclamation and reduction treatment of discharged sludge of municipal wastewater treatment plants, and the volume of the treated sludge is reduced by more than 70%, thereby effectively saving landfill land resources; the sludge treatment method is simple in operation, low in cost and low in energy consumption; by using the method disclosed by the invention, harmful substances in the sludge can be degraded completely, thereby avoiding the secondary pollution to the environment; meanwhile, the mud cakes can be directly used as boiler fuel so as to recycle heat energy.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a low-energy drying treatment method for discharged sludge in a municipal sewage treatment plant. Background technique [0002] With people's increasing emphasis on environmental protection, sewage treatment plants have been built in various places, and the sewage treatment capacity and sludge production have increased dramatically. Sludge contains many harmful substances, such as: refractory organic matter, carcinogenic, carcinogenic Teratogenic and mutagenic dangerous compounds, heavy metal ions, pathogenic microorganisms, etc. The high contamination of sludge leads to high environmental risks, and at the same time, its refractory and high water content make the actual sludge treatment difficult and expensive. The treatment and disposal of sludge has become an increasingly urgent and serious problem in environmental protection. With the acceleration of urbanization in my country t...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 唐菊香雷婵
Owner 唐菊香
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