Sludge magnetic dewatering agent and dewatering method thereof

A dehydrating agent and magnetic technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of high energy consumption, difficult to remove, difficult to operate, etc., to improve physical and mechanical properties, solve problems in treatment and disposal, and reduce dehydration time. Effect

Inactive Publication Date: 2014-09-03
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the sludge contains a large amount of organic matter, there is currently a problem that the surface water of the organic matter cells and the water inside the cells are difficult to remove
Generally, the moisture content of the sludge after concentration and dehydration is still above 80%. If further dehydration is required, it generally needs to be treated by heating, resulting in complicated processes and high treatment costs. In addition, the sludge with such a high moisture content is soft and sticky. Perishable and smelly, bulky, poor pressure bearing capacity, there are many problems such as difficult operation, secondary pollution, high energy consumption, etc. in the process of loading, transportation and disposal

Method used

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  • Sludge magnetic dewatering agent and dewatering method thereof

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Effect test

Embodiment 1

[0039] (1) Prepare 50Kg of the magnetic dehydrating agent, wherein the contents of each component of the magnetic dehydrating agent are as follows: acrylamide 4.5Kg, chitin 8.5Kg, ferric chloride 10.5Kg, sodium chloride 7.5Kg, aluminum chloride 7.5 Kg, concentrated sulfuric acid 4Kg, iron powder 7.5Kg, described concentrated sulfuric acid is placed separately, stand-by; Described acrylamide, chitin, ferric chloride, sodium chloride, aluminum chloride, iron powder are mixed by described weight After uniformity, pour into a beaker, add clear water to the beaker, the volume ratio of the added clear water to the mixture is: 1:1. The beaker is then heated in a boiling water bath until all the water has evaporated, the mixture is taken out and ground into powder;

[0040] (2) Take 1 ton of sludge to be treated with a water content of 60%, add the mixed and ground powder described in step (1) to the sludge, stir evenly, and then add the step ( 1) Concentrated sulfuric acid with the ...

Embodiment 2

[0044] (1) Prepare 60Kg of the magnetic dehydrating agent, wherein the contents of each component of the magnetic dehydrating agent are as follows: acrylamide 11.4Kg, chitin 4.2Kg, ferric chloride 8.4Kg, sodium chloride 10.2Kg, aluminum chloride 9Kg , concentrated sulfuric acid 0.6Kg, iron powder 16.2Kg, the concentrated sulfuric acid is placed separately, stand-by; The acrylamide, chitin, ferric chloride, sodium chloride, aluminum chloride, iron powder are mixed according to the stated weight After uniformity, pour into a beaker, add clear water to the beaker, the volume ratio of the added clear water to the mixture is: 1:1. The beaker is then heated in a boiling water bath until all the water has evaporated, the mixture is taken out and ground into powder;

[0045] (2) Take 1 ton of sludge to be treated with a water content of 70%, first add the mixed and ground powder described in step (1) to the sludge, stir evenly, and then add the step ( 1) Concentrated sulfuric acid wi...

Embodiment 3

[0049] (1) Prepare 80Kg of the magnetic dehydrating agent, wherein, the contents of each component of the magnetic dehydrating agent are as follows: 12Kg of acrylamide, 8Kg of chitin, 16Kg of ferric chloride, 12Kg of sodium chloride, 17.6Kg of aluminum chloride, concentrated sulfuric acid 4Kg, iron powder 10.4Kg, place the concentrated sulfuric acid separately, stand-by; Mix the acrylamide, chitin, ferric chloride, sodium chloride, aluminum chloride, iron powder according to the stated weight and then pour into A beaker, adding clear water to the beaker, the volume ratio of the added clear water to the mixture is: 1:1. The beaker is then heated in a boiling water bath until all the water has evaporated, the mixture is taken out and ground into powder;

[0050] (2) Take 1 ton of sludge to be treated with a water content of 80%, add the mixed and ground powder described in step (1) to the sludge, stir evenly, and then add the step ( 1) Concentrated sulfuric acid with the weight...

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Abstract

The invention relates to a sludge magnetic dewatering agent and a dewatering method thereof. The magnetic dewatering agent is composed of the following compositions in percent by weight: 9-19% of acrylamide, 7-17% of chitin, 14-21% of ferric chloride, 10-17% of sodium chloride, 15-22% of aluminum chloride, 1-8% of concentrated sulfuric acid and 15-32% of iron powder. The dewatering agent is wide in raw material source and low in price. Dewatering is performed by employing a magnetic dewatering machine and utilizing the magnetic dewatering agent, the sludge dewatering time is reduced, and also deep dewatering for sludge is realized, 1 ton of sludge with the water content of 60%-99% can be dewatered to have the water content of 25-45% in 45 min, subsequent processing of sludge is substantially facilitated, requirements on subsequent second ploughing and greening are satisfied, and the processing and disposing problems of a large amount of stacked sludge are solved. By employing the magnetic dewatering machine, economy, convenience and good dewatering efficiency are realized.

Description

technical field [0001] The invention relates to a sludge dewatering agent in the technical field of sewage, waste water and sludge treatment, in particular to a magnetic sludge dewatering agent used in the dehydration process of dewatered sludge in a sewage plant. Background technique [0002] The mixed sludge produced by domestic sewage treatment and the biologically treated sludge produced by industrial wastewater are typical organic sludge, which produces a large amount of sludge. The sludge output of a medium-sized sewage plant with a treatment scale of 100,000 tons / day is about 600 tons. Taking Shanghai as an example, the primary sewage treatment capacity is 3.71 million tons / day, and 22,260 tons / day of sludge is generated. The above sludge with high water content needs to be concentrated and dehydrated. At present, there are many sludge dehydrating agents and dehydrating methods: [0003] The patent number is: "ZL200410050738.5" and the invention patent named: "Sludge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 孟庆山王帅秦月雷学文程福周黄明柱
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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