Method for conditioning and promoting excess sludge to produce methane through sodium ferrous chlorophyllin

A technology for excess sludge and chlorophyll, applied in biological sludge treatment, gas fuel, waste fuel, etc., can solve the problems of cumbersome operation, large amount of reagents, reagent residue, etc., and achieve simple operation, low dosage and low cost low effect

Inactive Publication Date: 2019-06-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of cumbersome operation, large amount of reagents, residual reagents and high energy consumption in the current pretreatment method, the present invention uses a Fenton-like system composed of sodium iron chlorophyllin and hydrogen peroxide to efficiently and quickly promote the disintegration of sludge flocs, Improve the methane production rate of anaerobic digestion, chlorophyll iron salt is used by microorganisms as organic matter in the anaerobic digestion process, and there is no residue of pretreatment reagents

Method used

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  • Method for conditioning and promoting excess sludge to produce methane through sodium ferrous chlorophyllin
  • Method for conditioning and promoting excess sludge to produce methane through sodium ferrous chlorophyllin
  • Method for conditioning and promoting excess sludge to produce methane through sodium ferrous chlorophyllin

Examples

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Embodiment 1

[0027] (I) Condition excess sludge with ferric chlorophyllin sodium salt: take 50mL residual sludge with a moisture content of 96.5% and place it in a beaker, place the beaker on a magnetic stirrer and stir at a speed of 500rpm, weigh 0.0071g of ferric chlorophyllin sodium salt into the beaker, and after stirring for 5 minutes, add 0.09 mL of 30% H 2 o 2 solution, stirred and conditioned for 100 min.

[0028] (II) Anaerobic digestion for methane production: mix the conditioned residual sludge with the mature anaerobic granular sludge in the brewery in step (I), and the inoculum amount of the anaerobic granular sludge is 10% of the total dry matter mass , the fermentation concentration is 5%, and the total volume of the anaerobic digestion reactor is 100mL. The reactor adopts a high boron glass container, and the opening is sealed with a silicone plug and silicone rubber. The anaerobic digestion reactor is placed in a constant temperature shaking incubator, and a water bath ...

Embodiment 2

[0030] (I) Condition excess sludge with ferric chlorophyllin sodium salt: take 100mL residual sludge with a moisture content of 99.5% and place it in a beaker, place the beaker on a magnetic stirrer and stir at a speed of 200rpm, weigh 0.013g of ferric chlorophyllin sodium salt into the beaker, and after stirring for 2 minutes, add 0.065mL of 30% H 2 o 2solution, stirring and conditioning for 140min. After conditioning, the capillary water absorption time of the sludge was 487.7s, compared with 184.4s of the original sludge, the sludge was fully degraded, and the floc cracking effect was good.

[0031] (II) Anaerobic digestion for methane production: mix the conditioned residual sludge with the mature anaerobic granular sludge in the brewery in step (I), and the inoculum amount of the anaerobic granular sludge is 10% of the total dry matter mass , the fermentation concentration is 5%, and the total volume of the anaerobic digestion reactor is 200mL. The reactor adopts a hig...

Embodiment 3

[0033] (I) Condition excess sludge with ferric chlorophyllin sodium salt: take 500mL residual sludge with a moisture content of 98.5% and place it in a beaker, place the beaker on a magnetic stirrer and stir at a speed of 400rpm, weigh 0.013g of ferric chlorophyllin sodium salt into the beaker, and after stirring for 4 minutes, add 0.16mL of 30% H 2 o 2 Solution, stirring and conditioning for 160min. After conditioning, the capillary water absorption time of the sludge was 447.6s, compared with 184.4s of the original sludge, the sludge was fully degraded, and the floc cracking effect was good.

[0034] (II) Anaerobic digestion for methane production: mix the conditioned residual sludge with the mature anaerobic granular sludge in the brewery in step (I), and the inoculation amount of the anaerobic granular sludge is 20% of the total dry matter mass , the fermentation concentration is 5%, and the total volume of the anaerobic digestion reactor is 550mL. The reactor adopts a ...

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Abstract

The invention belongs to the field of sludge treating, handling and recycling, and discloses a method for conditioning and promoting excess sludge to produce methane through sodium ferrous chlorophyllin. The method comprises the following steps: conditioning the excess sludge through the sodium ferrous chlorophyllin; inoculating anaerobion to the conditioned excess sludge; and performing anaerobicdigestion under intermediate temperature condition of 30-45 DEG C to produce methane. The method optimally comprises the following steps: conditioning the excess sludge through the sodium ferrous chlorophyllin, specifically adding the sodium ferrous chlorophyllin to the excess sludge, stirring until the sodium ferrous chlorophyllin is completely dissolved, then continuously adding an H2O2 solution, and continuously stirring for a period of time to achieve conditioning. According to the method, the sludge flocs can be promoted to decompose, and organic substances are released, so that macromolecular organics can be oxidized and degraded into micromolecular organics, and the biodegradability of the excess sludge can be improved; the hydrolysis process of the organics in the anaerobic digestion process is reduced; the organics decomposing rate is increased; the quantity of accumulated intermediate products is increased, so that the process of producing the methane by anaerobic digestionis promoted.

Description

technical field [0001] The invention belongs to the field of sludge treatment and disposal as a resource, and more specifically relates to a method for promoting methane production from excess sludge through conditioning with sodium iron chlorophyllin. Background technique [0002] Anaerobic digestion treatment of excess sludge to produce methane is an effective way to utilize excess sludge as a resource. When excess sludge is used as a biomass energy, due to the structure of bacteria clusters formed by the encapsulation of organic matter in sludge flocs, in The process of anaerobic digestion requires a long time for cell destruction and organic matter hydrolysis; therefore, pretreatment is often required during resource treatment to speed up the cell destruction of sludge flocs, promote the hydrolysis of organic matter in sludge, and improve the efficiency of resource utilization . At present, the residual sludge pretreatment technology includes physical treatment (heat tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C10L3/08
CPCY02E50/30
Inventor 侯慧杰陈硕李珍胡敬平刘冰川杨家宽梁莎肖可可雷龙海胡少刚卜晨鹏
Owner HUAZHONG UNIV OF SCI & TECH
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