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Method for strengthening anaerobic digestion based on sludge solid-liquid interface updating

An anaerobic digestion and liquid interface technology, applied in the field of sludge recycling, can solve the problem of low efficiency of sludge anaerobic digestion, and achieve the effect of improving electron utilization efficiency, changing water distribution, and increasing surface energy.

Active Publication Date: 2020-12-08
TONGJI UNIV
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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 method for strengthening anaerobic digestion based on sludge solid-liquid interface renewal in order to solve the problem of low sludge anaerobic digestion efficiency

Method used

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  • Method for strengthening anaerobic digestion based on sludge solid-liquid interface updating

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Effect test

Embodiment 1

[0032] 1. Take 1000mL of sewage plant sludge and centrifuge for 20min at a centrifugal force of 2000g for solid-liquid separation, and collect residual sludge;

[0033] 2. Put the residual sludge in 1 into an oven at 80°C, and use dry hot air to treat it at a constant temperature for 120 minutes;

[0034] 3. Use 500mL of demineralized water to redissolve the sludge treated with dry hot air at constant temperature in 2, and stir at 200r / min for 2h;

[0035] 4. Move the sludge in 3 into the anaerobic reactor as a whole, and use hydrochloric acid or lye to adjust the pH to 6.0-8.0, and carry out anaerobic digestion at 37°C for 15 days at an inoculation ratio of 1:2 (VS). methane. The biochemical methane potential tester (BMP, AMPTSⅡ) was used to automatically record data and calculate the methane production per unit of organic matter (mL CH 4 / g VS) The results show that the sludge treated by this method has a unit organic matter methane yield (mL CH 4 / g VS) increased by 80%....

Embodiment 2

[0037] 1. Take 1000mL of sewage plant sludge and centrifuge at 4000g for 10 minutes to separate solid and liquid, and collect residual sludge;

[0038] 2. Put the residual sludge in 1 into an oven at 105°C, and use dry hot air to treat it at a constant temperature for 90 minutes;

[0039] 3. Use 500mL of demineralized water to redissolve the sludge that has been treated with dry hot air at a constant temperature in 2, and stir at a speed of 300r / min for 2h;

[0040] 4. Move the sludge in 3 into the anaerobic reactor as a whole, and use hydrochloric acid or lye to adjust the pH to 6.0-8.0, and carry out anaerobic digestion at 37°C for 15 days at an inoculum ratio of 1:1 (VS). methane. The biochemical methane potential tester (BMP, AMPTSⅡ) was used to automatically record data and calculate the methane production per unit of organic matter (mL CH 4 / g VS).

[0041] The results show that the sludge treated by this method has a unit organic matter methane yield (mL CH 4 / g VS)...

Embodiment 3

[0043] 1. Take 1000mL of sewage plant sludge and centrifuge at 6000g for 10 minutes to separate solid and liquid, and collect residual sludge;

[0044] 2. Put the residual sludge in 1 into a 95°C oven, and use dry hot air to treat it at a constant temperature for 90 minutes;

[0045] 3. Use 500mL of demineralized water to redissolve the sludge that has been treated with dry hot air at a constant temperature in 2, and stir at a speed of 400r / min for 0.5h;

[0046] 4. Move the sludge in 3 into the anaerobic reactor as a whole, and use hydrochloric acid or lye to adjust the pH to 6.0-8.0, and carry out anaerobic digestion at 37°C for 15 days at an inoculation ratio of 1:2 (VS). methane. The biochemical methane potential tester (BMP, AMPTSⅡ) was used to automatically record data and calculate the methane production per unit of organic matter (mL CH 4 / g VS).

[0047] The results show that the sludge treated by this method has a unit organic matter methane yield (mL CH 4 / g VS)...

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Abstract

The invention relates to a method for strengthening anaerobic digestion based on sludge solid-liquid interface updating. The method comprises the following steps: sequentially carrying out centrifugaltreatment, heat drying treatment and softened water redissolution treatment on sludge to update a solid-liquid interface in the sludge, and then carrying out anaerobic digestion to increase the anaerobic biotransformation methane production amount of sludge organic matters. Compared with the prior art, the anaerobic digestion unit organic matter methane yield of the sludge treated through the method is increased by 50%-200%, and the anaerobic digestion efficiency of the sludge is greatly improved; the method is remarkable in effect; and the method for strengthening anaerobic digestion based on sludge solid-liquid interface updating has important significance for improving the application of a sludge anaerobic digestion technology.

Description

technical field [0001] The invention belongs to the technical field of sludge resource utilization, and in particular relates to a method for strengthening anaerobic digestion based on sludge solid-liquid interface renewal. Background technique [0002] With the widespread application of activated sludge method in urban sewage treatment plants, a large amount of waste sludge will be produced. According to incomplete statistics, the annual output of sewage plant sludge has exceeded 65 million tons (calculated at a moisture content of 80%), and is increasing at a rate of 10% per year. Sludge is rich in perishable organic matter and toxic and harmful substances. If it is not properly treated, it will cause serious secondary pollution. Anaerobic digestion can recover energy from sludge while reducing environmental pollution of sludge, such as methane-rich biogas (the proportion of methane is about 65%), and has become a favored sludge treatment technology in the world. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/13
CPCC02F11/04C02F11/13C02F11/127C02F1/66C02F9/00C02F2209/02C02F2209/44C02F2209/10Y02E50/30
Inventor 许颖戴晓虎
Owner TONGJI UNIV
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