A method and equipment for sludge dewatering

A sludge dewatering and sludge technology, applied in dewatering/drying/concentrating sludge treatment and other directions, can solve the problems of complex device structure and operation, large floor space, large economic cost, etc., and achieve convenient operation, short time, The effect of improving dewatering performance

Inactive Publication Date: 2015-10-28
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patented device is aimed at sludge with a solid content of about 8%, and its scope of application is too small, and the structure and operation of the device are relatively complicated, occupying a large area, and difficult to maintain
In addition, this method requires pre-dehydration at the beginning, and strong dehydration at the end. The specific role of conditioning in the middle link on the dehydration effect needs further research, and the economic consumption is large and the cost is high.

Method used

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  • A method and equipment for sludge dewatering
  • A method and equipment for sludge dewatering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The sludge to be dewatered is collected from a sewage treatment plant in Beijing, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 6.87g / L, the moisture content was 99.29%, and the pH value was 7.34.

[0034] 1) Place the activated sludge in a horizontal pressurized electric field reactor;

[0035] 2) Accurately weigh the magnetic material of 300g / kg of dry sludge, quickly put the magnetic material into the sludge at a stirring intensity of 750 rpm / min, stir for 30 seconds, and then stir for 25 minutes at 50 rpm / min;

[0036] 3) Connect the negative and positive poles of the reactor to the negative and positive poles of the power supply, and adjust the voltage to a constant 40V. Connect the pressure control device and set the pressure value to 100kPa. Turn on the p...

Embodiment 2

[0039] The sludge to be dewatered is collected from a sewage treatment plant in Beijing, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 6.20g / L, the moisture content was 99.36%, and the pH value was 7.44.

[0040] 1) Place the activated sludge in a horizontal pressurized electric field reactor;

[0041] 2) Accurately weigh the magnetic material of 300g / kg of dry sludge, quickly put the magnetic material into the sludge at a stirring intensity of 900rpm / min, stir for 30s, and then stir for 25min at 50rpm / min;

[0042] 3) Connect the negative and positive poles of the reactor to the negative and positive poles of the power supply, and adjust the voltage to a constant 40V. Connect the pressure control device and set the pressure value to 300kPa. Turn on the power switch ...

Embodiment 3

[0045] The sludge to be dewatered is collected from a sewage treatment plant in Beijing, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 6.37g / L, the moisture content was 99.42%, and the pH value was 7.38.

[0046] 1) Place the activated sludge in a horizontal pressurized electric field reactor;

[0047] 2) Accurately weigh the magnetic material of 150g / kg of dry sludge, quickly put the magnetic material into the sludge at a stirring intensity of 900rpm / min, stir for 30s, and then stir for 25min at 100rpm / min;

[0048] 3) Connect the negative and positive poles of the reactor to the negative and positive poles of the power supply, and adjust the voltage to a constant 50V. Connect the pressure control device and set the pressure value to 300kPa. Turn on the power switch...

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Abstract

A sludge dehydrating method and a device therefor are provided. The method includes steps of: adding sludge into a reacting device, stirring, adding a magnetic material at the same time, reacting, switching an electric field power supply on for the reacting device, and applying a horizontal pressure to dehydrate the sludge. The addition of the magnetic material can increase the sludge floc size and destroy structures of sludge extracellular polymers, thus improving the dehydrating property of the sludge. In addition, the micro magnetic field, electric conduction, and other properties of the magnetic material assist dehydration of the electric field. Free water and a part of bound water in the sludge are finally removed. The device for the method comprises the reacting device, a stirrer, the power supply, a pressurizing device, and the like, and has characteristics of simple operation processes and stable performance. The method effectively reduces the water content of the sludge, reduces the volume of the sludge and improves the sludge reclamation potential. Applications show that: the sludge dehydrating method and the device therefor can allow the water content of the sludge to be 10-50%.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and disposal, and in particular relates to a method for dehydrating and reducing sludge. Background technique [0002] Municipal sludge is solid waste produced by sewage treatment units in urban sewage treatment plants. According to the prediction of relevant departments, the amount of urban sewage in my country will increase significantly in the next 20 years (the sewage discharge will reach 54 billion tons in 2020 / year), and the resulting sludge volume will also increase (5.4~2.16 billion t / year). Therefore, the disposal of sludge has become an important issue faced by municipal industries in various countries. The moisture content of activated sludge produced in the sewage treatment unit can reach more than 99%, and the moisture content of digested sludge can reach more than 96%. At present, the main problems in sludge treatment are the poor dehydration effect and high water content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12C02F11/14
Inventor 王毅力钱旭
Owner BEIJING FORESTRY UNIVERSITY
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