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Recycling technology for sludge generated after sewage treatment

A sludge recycling and sewage treatment technology, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc. Low mud disposal cost and good economic benefits

Inactive Publication Date: 2016-01-20
李文锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These pollutions will eventually affect water bodies and soils, damage plant roots, easily accumulate toxicity in crops, animals and humans, and pollute the environment, etc.

Method used

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  • Recycling technology for sludge generated after sewage treatment

Examples

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Effect test

Embodiment 1

[0020] A sludge recycling technology after sewage treatment, which specifically includes the following steps: Concentration: use centrifugal concentration to reduce the water content of the sludge from 99.2% to 99.5% to 94%, add diatomaceous earth, microbial flocculant (MBF), The compound mass ratio of diatomite to MBF is 50:1, and then a certain proportion of quicklime is added to make a modified diatomite containing 35% calcium carbonate. After conditioning, mechanical dehydration is used to force the sludge water to pass through the filter medium , to form a filtrate, and then the solid particles are trapped on the medium to form a filter cake; add 25mg / gTS protease and 0.2g / gTS concentration of EDTA-2Na salt at 100°C to destroy the cell and colloidal structure of the sludge and reduce Combining the water capacity and compressibility of the sludge, deep dehydration is carried out to make the moisture content of the sludge below 30%; the sludge is subjected to thermal hydroly...

Embodiment 2

[0022] A sludge recycling technology after sewage treatment, which specifically includes the following steps: Concentration: use centrifugal concentration to reduce the water content of the sludge from 99.2% to 99.5% to 94%, add diatomaceous earth, microbial flocculant (MBF), The compounding mass ratio of diatomite to MBF is 30:1, and then a certain proportion of quicklime is added to make a modified diatomite containing 25% calcium carbonate. After conditioning, mechanical dehydration is used to force the sludge water to pass through the filter medium , to form a filtrate, and then the solid particles are trapped on the medium to form a filter cake; add 25mg / gTS protease and 0.2g / gTS concentration of EDTA-2Na salt at 110 ° C to destroy the cell and colloidal structure of the sludge and reduce Combining the water capacity and compressibility of the sludge, deep dehydration is carried out to make the moisture content of the sludge below 30%; the sludge is subjected to thermal hy...

Embodiment 3

[0024] A sludge recycling technology after sewage treatment, which specifically includes the following steps: Concentration: use centrifugal concentration to reduce the water content of the sludge from 99.2% to 99.5% to 94%, add diatomaceous earth, microbial flocculant (MBF), The compound mass ratio of diatomite to MBF is 5:1, and then put in a certain proportion of quicklime to prepare a modified diatomite containing 25% calcium carbonate. After conditioning, use mechanical dehydration to force the sludge water to pass through the filter medium , to form a filtrate, and then the solid particles are trapped on the medium to form a filter cake; add 25mg / gTS protease and 0.2g / gTS concentration of EDTA-2Na salt at 120°C to destroy the cell and colloidal structure of the sludge and reduce Combining the water capacity and compressibility of the sludge, deep dehydration is carried out to make the moisture content of the sludge below 20%; the sludge is subjected to thermal hydrolysis ...

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Abstract

The invention relates to a recycling technology for sludge generated after sewage treatment. The recycling technology includes the concrete steps of concentration, flocculation treatment, mechanical dehydration, deep dehydration, anaerobic digestion, marsh gas collection, purification and depuration, sludge heat drying, land utilization, building material utilization, other aspects of utilization and the like. Sludge stabilization, reduction and harmlessness are achieved, and finally the resource recycling effect is achieved.

Description

technical field [0001] The invention relates to a sewage comprehensive treatment technology, in particular to a sludge recycling technology after sewage treatment. Background technique [0002] According to statistics, my country's current urban sewage treatment plants discharge about 300,000 tons of dry sludge every year, and it is increasing at a rate of about 10%. The composition of sludge is very complex. It is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. In addition to a large amount of water, there are also refractory organic matter, heavy metals, and salts. And pathogenic microorganisms and parasites, eggs, etc. If the sludge is not effectively disposed of, it may cause the following hazards: pathogen pollution, excessive salt pollution, excessive nitrogen and phosphorus pollution, organic polymer pollution and heavy metal pollution. These pollutions will eventually affect water bodies and s...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/14C02F11/02
Inventor 李文锋邓丽蓉顾华章艾新龙
Owner 李文锋
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