Supersonic dewatering method for mud

An ultrasonic and sludge technology, applied in the direction of dewatering/drying/concentrating sludge treatment, can solve the problems of high cost, high cost and complicated process, and achieve the effect of reducing cost, good effect and low price

Inactive Publication Date: 2006-08-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gravity settling can increase the weight ratio of solid content in sludge from 2% to 5%. Usually, it is adjusted by anaerobic, aerobic, lime, heating and cold solution methods. The process is complicated and the cost is high. Some sewage treatment plants not adopted
Mechanical dehydration is a must for sewage treatment plants. Common methods include ordinary filtration, pressure filtration, vacuum filtration, and centrifugation. Mechanical dehydration is limited by the structure of the sludge itself, and the dehydration effect is very limited.
In addition, Shanghai Shidongkou Urban Wastewater Treatment Plant adopts the sludge drying and incineration project, and uses thermal methods to dry and dehydrate the sludge, which requires a lot of heat, so the cost is very expensive

Method used

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  • Supersonic dewatering method for mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An urban sewage treatment plant in Qinhuangdao adopts the activated sludge method for treatment, and the properties of the dewatered sludge are shown in Table 2:

[0020] moisture content

(%)

Volatile content

(%)

Ash content

(%)

fixed carbon

(%)

lower calorific value

(kcal / g)

84.20

40.95

56.66

2.39

457

[0021] The moisture content of the treated sludge is shown in Table 3:

[0022]

Embodiment 2

[0024] An urban sewage treatment plant in Nanshan District, Shenzhen, adopts the oxidation ditch process to treat sewage. The properties of dewatered sludge are shown in Table 4:

[0025] moisture content

[0026] The moisture content of the treated sludge is shown in Table 5:

[0027]

[0028] From the above examples, it can be concluded that after the sludge is treated with ultrasonic waves, the water content drops from 80-85% to 60-70%, which lays a good foundation for the later recycling of sludge. The energy consumption of the present invention mainly comes from the energy consumption of the ultrasonic generator and other supporting facilities, all of which are mechanical equipment with low power and low energy consumption. Compared with other dehydration technologies, the cost and energy consumption will be greatly reduced, so there is a comparative advantage. Good market prospect.

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Abstract

The present invention relates to supersonic mud dewatering method and belongs to the field of solid waste treating technology. The supersonic mud dewatering method includes: the first treatment of dewatered mud from sewage treating yard in a stirrer and a press to form cake, treating in a supersonic treating unit, further dewatering in a dewatering unit to obtain dewatered mud as resource, and draining the separated water back to sewage treating yard. The treated mud has water content lowered from 80-85 % to 60-70 % and is suitable for use as resource. Compared with available technology, the present invention has low power consumption, low cost and excellent application foreground.

Description

technical field [0001] The invention relates to a method for modifying and dehydrating the sludge of a sewage treatment plant by using the ultrasonic principle, and belongs to the technical field of solid waste treatment. Background technique [0002] Along with the increasingly serious problem of environmental protection, more and more cities have built urban sewage treatment plants to deal with residents' domestic sewage, thus producing a by-product—sludge. Sludge is composed of organic debris, bacterial cells, colloids, various microorganisms, and organic and inorganic particles. It contains 90% to 99% of water and 1% to 10% of solid content. At present, the discharge of urban sludge in my country has reached tens of millions of tons, and it is increasing at a rate of 10% every year, which has brought enormous pressure to the environment. The sludge production in foreign countries is also very large. For example, the annual output of sludge produced by sewage treatment i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 蒋建国张群芳郭权
Owner TSINGHUA UNIV
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