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Method for deeply dehydrating sludge by utilizing modified waste filter bag

A deep dehydration and sludge technology, applied in dehydration/drying/concentrated sludge treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of increasing the cost of filter cake disposal, difficult mechanical crushing, and low economic efficiency and other problems, to achieve the effect of improving dehydration efficiency, improving viscoelasticity and low energy consumption

Active Publication Date: 2021-01-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of organic materials can increase the calorific value of the sludge filter cake, but the cost is high, it is not easy to be mechanically crushed, and the economy is low; although the inorganic components are relatively economical, they increase the disposal cost of the filter cake

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Wash the discarded filter bag and break it into rod-shaped fibers less than 0.5cm in length, then crystallize the rod-shaped glass fiber, magnesium aluminum hydrotalcite solution and excess urea at 110°C for 24 hours, filter and wash, and then put the obtained crystals at 350°C Calcined for 4 hours to obtain basic crystalline glass fiber.

[0024] In terms of mass fraction, 100 parts of pesticide sludge with a water content of 80% preheated by the filtrate obtained after mechanical pressure filtration, 10 parts of alkaline crystal glass fiber, and 100 parts of filtrate obtained after mechanical pressure filtration were added to hot water Heat up to 60°C and react for 90 minutes. After the reaction, mechanically filter the mud-water mixture to obtain the filter cake and filtrate of pesticide sludge.

[0025] The water content of the filter cake is 55%, and the filtrate can be used to preheat the untreated sludge, and after cooling, circulate to the sludge treatment tank ...

Embodiment 2

[0027] Wash the discarded filter bag and break it into rod-shaped fibers with a length less than 0.5cm, then crystallize the rod-shaped glass fiber, magnesium aluminum hydrotalcite solution and excess urea at 130°C for 18h, filter and wash, and then put the obtained crystals at 350°C Calcined for 4 hours to obtain basic crystalline glass fiber.

[0028] In terms of mass fraction, 100 parts of municipal sludge with a water content of 80% preheated by the filtrate obtained after mechanical pressure filtration, 5 parts of alkaline crystal glass fiber, and 100 parts of filtrate obtained after mechanical pressure filtration were added to hot water Heat up to 80°C and react for 60 minutes. After the reaction, mechanically filter the mud-water mixture to obtain the filter cake and filtrate of pesticide sludge.

[0029] The water content of the filter cake is 53%, and the filtrate can be used to preheat the untreated sludge, and after cooling, circulate to the sludge treatment tank fo...

Embodiment 3

[0031] Wash the discarded filter bag and break it into rod-shaped fibers with a length less than 0.5cm, then crystallize the rod-shaped glass fiber, magnesium aluminum hydrotalcite solution and excess urea at 150°C for 12h, filter and wash, and then put the obtained crystals at 350°C Calcined for 4 hours to obtain basic crystalline glass fiber.

[0032] In terms of mass fraction, 100 parts of municipal sludge with a water content of 80% preheated by the filtrate obtained after mechanical pressure filtration, 20 parts of alkaline crystal glass fiber, and 100 parts of filtrate obtained after mechanical pressure filtration were added to hot water Heat up to 100°C and react for 45 minutes. After the reaction, filter the mud-water mixture mechanically to obtain the filter cake and filtrate of pesticide sludge.

[0033] The water content of the filter cake is 51%, and the filtrate can be used to preheat the untreated sludge, and after cooling, circulate to the sludge treatment tank ...

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Abstract

The invention provides a method for deeply dehydrating sludge by utilizing a modified waste filter bag, and belongs to the technical field of environmental engineering and sludge treatment. Accordingto the method, the waste filter bag is crushed and then modified, and the modified product and the sludge are subjected to hydrothermal reaction together so that the purpose of deep dehydration of thesludge is achieved; according to the method, the advantages of a framework material and alkaline catalytic sludge hydrolysis are fully utilized, the hydrolysis capacity of organic matters is improved, the viscoelasticity of the sludge is improved during dehydration, the dehydration efficiency is improved, the energy consumption is reduced, meanwhile, redundant filtrate can preheat the sludge, andcooled filtrate returns to a sewage treatment tank to be further treated; and the waste filter bags are recycled so that the cost of the framework material is reduced, and the wastes are recycled.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and sludge treatment, and in particular relates to a method for deep dewatering sludge by using modified waste filter bags. Background technique [0002] Sludge is a semi-solid product with high moisture content, high organic content and may contain a large amount of toxic and harmful substances, such as organic matter, heavy metals, pathogenic bacteria, etc. If it is not disposed of properly, it will cause serious harm to the environment. At present, the water content of the sludge in the project after mechanical pressure filtration is 80%~85%. The high water content is not only not conducive to the subsequent treatment of the sludge, but also increases the cost of sludge transportation. [0003] Commonly used sludge dewatering methods include drying method, skeleton material method, hydrothermal method and so on. The hydrothermal method heats the sludge under airtight conditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/13C02F11/122
CPCC02F11/00C02F11/13C02F11/122
Inventor 徐志祥马雪芹
Owner JIANGSU UNIV
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