Municipal sludge drying method

A technology for municipal sludge and sludge drying, which is applied in the direction of dewatering/drying/concentrating sludge treatment to reduce pollution, eliminate secondary pollution, and eliminate bacteria and viruses.

Active Publication Date: 2012-02-15
NANJING GUONENG ENVIRONMENTAL PROTECTION ENG
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  • Abstract
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Problems solved by technology

[0005] In order to solve the problem of sludge treatment and disposal, the present invention provides a new sludge dry

Method used

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  • Municipal sludge drying method

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] The wet sludge is dumped into the wet sludge storage bin through the sludge transport vehicle. The upper part of the wet sludge storage bin is a half-closed half-open device. After dumping, the bin cover is automatically closed. A sieve plate is set above the wet sludge bin to prevent large pieces of foreign matter from entering the bin. At the same time, a sealed door is installed above the bin body to prevent odor from escaping, and a gas detection, collection and odor treatment system is also equipped.

[0014] Two double-screw pre-pressing conveyors are installed at the bottom of the sludge bin to output wet sludge. The outlet of each double-screw conveyor is connected to a sludge pump. After the wet sludge is pressurized by the sludge pump, it is transported to the The flow regulating valve continuously, at an even speed and with a cons...

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Abstract

The invention discloses a municipal sludge drying method, which is applicable to the treatment disposal of municipal dewatered sludge of municipal sewage treatment plants in combined use with electric plants. The method comprises the following flow processes of: (1) wet sludge drying flow process: pouring wet sludge to a wet sludge storage cabin through a sludge conveying vehicle, installing two double-spiral pre-pressing conveyors at the bottom of the sludge cabin and connecting a sludge pump under a material outlet of each double-spiral conveyor; (2) drying gas load flow process: sucking waste gas (steam) generated through the drying into a condenser, pumping and pressuring waste liquid after condensing, temperature reduction and dehumidification by a water pump, conveying the waste liquid to a sewage treatment system, simultaneously conveying defogged uncondensed gas and odor in the cabin into a boiler and carrying out burning decomposition at a high temperature; and (3) drying medium flow process: using the steam introduced from a low-pressure steam system of the electric plant as a heat source of a sludge drying system after the temperature reduction and pressure reduction.

Description

technical field [0001] The invention relates to a novel sludge drying method, in particular to a novel municipal sludge drying method used in conjunction with a power plant. Background technique [0002] With the development of cities, the status of environmental protection will become increasingly important. With the increase of urban sewage treatment rate, the sludge production has increased significantly, which also makes the problem of sludge treatment more prominent. [0003] Sludge contains concentrated inorganic and organic pollutants, as well as a large number of pathogens and various heavy metal elements. Therefore, sludge must be properly treated. Sludge treatment is to carry out deep and harmless treatment of sludge to completely solve the pollution of sludge to the environment and the harm to human beings. Through the sludge treatment and disposal method, the sewage sludge can be reduced, harmless and resourced. [0004] It is particularly important to develop...

Claims

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Application Information

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IPC IPC(8): C02F11/12
Inventor 朱士圣吴朋刘政艳
Owner NANJING GUONENG ENVIRONMENTAL PROTECTION ENG
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