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Sludge treatment method based on carbon dioxide emission reduction

A sludge treatment and carbon dioxide technology, applied in sludge treatment, water/sludge/sewage treatment, sludge treatment through temperature control, etc., can solve problems such as high carbon dioxide emissions and inconformity with low-carbon environmental protection concepts, and achieve Effects of reduced discharge and improved dehydration performance

Inactive Publication Date: 2022-04-29
江苏浦晏碳中和科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a sludge treatment method based on carbon dioxide emission reduction, to solve the existing sludge treatment process proposed in the above background technology, most of the sludge is treated by sanitary landfill. The carbon dioxide emissions are relatively high, which does not meet the concept of low-carbon environmental protection

Method used

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  • Sludge treatment method based on carbon dioxide emission reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] S1: adding 1 ton of wet sludge with a water content of 97% and passing through a filter press for preliminary dehydration to obtain sludge with a water content of 85%;

[0033] S2: The sludge obtained in step S1 is subjected to primary freezing, the freezing temperature condition is -10°C, and the freezing time is 8h, and the once frozen sludge is subjected to secondary freezing, the freezing temperature condition is -15°C, and the freezing time is 6h , freeze the sludge after secondary freezing three times, the freezing temperature condition is -20°C, and the freezing time is 3h;

[0034] S3: thawing the sludge after freezing three times, the thawing method is normal temperature thawing or heating thawing, making it reach normal temperature state;

[0035] S4: the sludge after thawing is carried out depth press filtration by filter press, the press filter pressure of filter press 1.2Mpa, press filter time is 60min, obtains the filter cake with moisture content 65%;

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Embodiment 2

[0039] S1: adding 1 ton of wet sludge with a water content of 97% and passing through a filter press for preliminary dehydration to obtain sludge with a water content of 85%;

[0040] S2: The sludge obtained in step S1 is subjected to primary freezing, the freezing temperature condition is -7.5°C, and the freezing time is 10h, and the once frozen sludge is subjected to secondary freezing, the freezing temperature condition is -12.5°C, and the freezing time is 7h , freeze the sludge after secondary freezing three times, the freezing temperature condition is -17.5°C, and the freezing time is 4h;

[0041] S3: thawing the sludge after freezing three times, the thawing method is normal temperature thawing or heating thawing, making it reach normal temperature state;

[0042] S4: the sludge after thawing is carried out depth press filtration by filter press, the press filter pressure of filter press 1.35Mpa, the press filter time is 75min, obtains the filter cake with moisture conte...

Embodiment 3

[0046] S1: adding 1 ton of wet sludge with a water content of 97% and passing through a filter press for preliminary dehydration to obtain sludge with a water content of 85%;

[0047] S2: The sludge obtained in step S1 is subjected to primary freezing, the freezing temperature condition is -5°C, and the freezing time is 12h, and the once frozen sludge is subjected to secondary freezing, the freezing temperature condition is -10°C, and the freezing time is 8h , freeze the sludge after secondary freezing for three times, the freezing temperature condition is -15°C, and the freezing time is 5h;

[0048] S3: thawing the sludge after freezing three times, the thawing method is normal temperature thawing or heating thawing, making it reach normal temperature state;

[0049] S4: the sludge after thawing is carried out depth press filtration by filter press, the press filter pressure of filter press 1.5Mpa, the press filter time is 90min, obtains the filter cake with moisture content 60...

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Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to a sludge treatment method based on carbon dioxide emission reduction, which comprises the following steps: S1, adding wet sludge with the moisture content of 97%-99% into a filter press, and carrying out preliminary dehydration to obtain sludge with the moisture content of 85%-92%; s2, the sludge obtained in the step S1 is subjected to primary freezing, the sludge subjected to primary freezing is subjected to secondary freezing, the sludge subjected to secondary freezing is subjected to tertiary freezing, the sludge is frozen through the primary freezing, the secondary freezing and the tertiary freezing, the freezing temperature is gradually reduced, the binding force of the sludge and water and the stability of colloid are damaged through freezing, and then the sludge is subjected to secondary freezing. The sludge particles are rapidly settled, the dehydration performance is greatly improved, the sludge filter cake is carbonized at low temperature and crushed to obtain carbonized particles, and the carbonized particles are used for cement filling, brick making and road repairing, so that the sludge is effectively utilized, and the emission of carbon dioxide is reduced.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge treatment method based on carbon dioxide emission reduction. Background technique [0002] Sludge treatment is the process of sludge reduction, stabilization and harmless treatment. The higher the degree of wastewater treatment, the more sludge residues are generated that need to be disposed of. Unless land treatment or sewage ponds are used to treat sewage, general sewage treatment plants must be equipped with sludge treatment facilities. For modern sewage treatment plants, the treatment and disposal of sludge has become the most complex and expensive part of the operation of the sewage treatment system. [0003] The characteristics of sludge from municipal sewage plants in my country are: 1. Large sludge output, large scale of sewage plants, and concentrated sludge production; 2. Low organic matter content; 3. Large differences in mud quality in different re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/12C02F11/122C02F11/20C10B53/00
CPCC02F11/122C02F11/12C02F11/20C02F11/10C10B53/00C02F2303/06
Inventor 许志刚
Owner 江苏浦晏碳中和科技有限公司