Method for producing hydrogen and recycling phosphorus through electrolysis of neutral Fenton regulated residual sludge microorganism

A technology of microbial electrolysis and excess sludge

Inactive Publication Date: 2018-11-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for reclaiming phosphorus by microbial electrolysis of neutral Fenton conditioning residual sludge, wherein through the overall process design of the treatment method, and each Key process steps (such as neutral Fenton conditioning, anaerobic digestion pretreatment, etc.) are improved and further optimized. Compared with the prior art, the problems of residual sludge treatment difficulty, poor effect and high cost can be effectively solved. The present invention utilizes The coordinated treatment of neutral Fenton conditioning, anaerobic digestion

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  • Method for producing hydrogen and recycling phosphorus through electrolysis of neutral Fenton regulated residual sludge microorganism
  • Method for producing hydrogen and recycling phosphorus through electrolysis of neutral Fenton regulated residual sludge microorganism
  • Method for producing hydrogen and recycling phosphorus through electrolysis of neutral Fenton regulated residual sludge microorganism

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Example Embodiment

[0039] Example 1

[0040] (I) Neutral Fenton conditioning: Take 500 mL of excess sludge with a TS content of 4.5 g / L and place it in a beaker, add 3.75 mL of 10 mM FeCl 3 Immediately after the solution, add 5.6mL of 10mM protocatechuic acid solution (of course, other concentrations of protocatechuic acid solution can also be used), stir quickly for 30s, and then add 0.4mL of 30% H 2 O 2 , stir quickly for 30s, and then stir slowly for 2h;

[0041] (II) Anaerobic digestion pretreatment: 400 mL of pretreated sludge in the step was added to 100 mL of anaerobic granular sludge to mix evenly, the fermentation concentration was 5%, the fermentation liquid was filled with high-purity nitrogen for 15 minutes, and anaerobic digestion was performed at 35°C 3d;

[0042] (III) MEC microbial acclimation: The total volume of the double-bottle MEC reactor is 600 mL and the effective volume is 500 mL. The anode of the MEC reactor is carbon brush, the cathode adopts stainless steel mesh, an...

Example Embodiment

[0045] Example 2

[0046] (I) Neutral Fenton conditioning: take 500 mL of excess sludge with a TS content of 5.7 g / L and place it in a beaker, add 10 mM FeCl 3 Immediately after 4.75 mL of the solution, add 7.1 mL of 10 mM nitrilotriacetic acid solution (of course, other concentrations of nitrilotriacetic acid solution can also be used), stir rapidly for 30 s, and then add 0.5 mL of 30% H 2 O 2 , stir quickly for 30s, and then stir slowly for 2h;

[0047] (II) Anaerobic digestion pretreatment: 400 mL of pretreated sludge in the step was added to 100 mL of anaerobic granular sludge to mix evenly, the fermentation concentration was 7%, the fermentation liquid was filled with high-purity nitrogen for 15 minutes, and anaerobic digestion was carried out at 35°C 3d;

[0048] (III) MEC microbial acclimation: The total volume of the double-bottle MEC reactor is 600 mL and the effective volume is 500 mL. The anode of the MEC reactor is carbon brush, the cathode adopts stainless stee...

Example Embodiment

[0051] Example 3

[0052] (I) Neutral Fenton conditioning: Take 500 mL of excess sludge with a TS content of 12.5 g / L and place it in a beaker, add 10 mM FeCl 3 Immediately after 21 mL of the solution, 32.5 mL of 10 mM protocatechuic acid solution was added, stirred rapidly for 60 s, and then 2.4 mL of 30% H was added. 2 O 2 , stir quickly for 30s, and then stir slowly for 2h;

[0053] (II) Anaerobic digestion pretreatment: add 350 mL of pretreated sludge in the step to 150 mL of anaerobic granular sludge and mix evenly, the fermentation concentration is 9%, the fermentation liquid is filled with high-purity nitrogen for 30 minutes, and anaerobic digestion is carried out at 35°C 5d;

[0054] (III) MEC microbial acclimation: The total volume of the double-bottle MEC reactor is 600 mL and the effective volume is 500 mL. The anode of the MEC reactor is carbon brush, the cathode adopts stainless steel mesh, and the inoculum adopts the stable running MEC effluent. 1.5g / L sodium...

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Abstract

The invention discloses a method for producing hydrogen and recycling phosphorus through electrolysis of neutral Fenton regulated residual sludge microorganism. The method comprises the following steps: firstly, performing neutral Fenton regulation on residual sludge, then performing anaerobic digestion on the regulated residual sludge, and controlling the anaerobic digestion process of the residual sludge, so as to obtain residual sludge supernatant at an acid production stage; then adding the residual sludge supernatant into an MEC reactor subjected to microbial acclimation, applying external micro voltage to the MEC reactor, and performing MEC hydrogen production; adding a magnesium source into catholyte of the MEC reactor after MEC hydrogen production is completed, adding the residualsludge supernatant at the anaerobic digestion methane production stage into the MEC reactor, and adjusting the pH value of a cathode chamber, so as to separate out struvite precipitate. Through improvement and further optimization to the technical process design of the whole treatment method and all key technical steps, compared with the prior art, the method has the advantages that the problems of high difficulty, poor effect and high cost in residual sludge treatment are solved, and phosphorus can be recycled in a struvite mode.

Description

technical field [0001] The invention belongs to the field of microbial electrochemistry, and more specifically relates to a method for neutralizing Fenton-conditioned excess sludge to produce hydrogen and recover phosphorus by microbial electrolysis. The method recovers phosphorus in the excess sludge in the form of struvite precipitation. Background technique [0002] Surplus sludge is a residual product of sewage treatment plants. It has the characteristics of large output, high moisture content, and complex composition. The subsequent treatment is difficult, ineffective, and expensive. The remaining sludge contains a large amount of organic matter and phosphorus. Dehydration incineration, pyrolysis, drying and other processes need to invest a lot of energy, which is not in line with the development trend of low energy consumption in the treatment process. Microbial Electrolysis Cell (MEC) degrades the organic components in the remaining sludge to produce protons and elec...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/04C02F11/06C12P3/00
CPCC02F11/006C02F11/04C02F11/06C02F2303/06C12P3/00
Inventor 侯慧杰李珍胡敬平刘冰川徐继坤潘可亮王安琪任天成
Owner HUAZHONG UNIV OF SCI & TECH
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