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

A technology of microbial electrolysis and excess sludge

A technology of microbial electrolysis and excess sludge

CN108751627AInactive Publication Date: 2018-11-06HUAZHONG UNIV OF SCI & TECH
5 Cites 7 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (I) Neutral Fenton conditioning: take 500mL of TS content of 4.5g / L residual sludge and place it in a beaker, add 3.75mL10mM FeCl 3 Immediately after the solution, add 5.6mL 10mM protocatechuic acid solution (of course, other concentrations can also be used as protocatechuic acid solution), stir rapidly for 30s, and then add 0.4mL 30% H 2 o 2 , stirring rapidly for 30s, then stirring slowly for 2h;

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

[0042] (Ⅲ) MEC microbial domestication: The total volume of the double-bottle MEC reactor is 600mL and the effective volume is 500mL. The anode of the MEC reactor is a carbon brush, the cathode is made of stainless steel mesh, and the inoculum is effluent from a...

Embodiment 2

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

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

[0048] (Ⅲ) MEC microbial domestication: The total volume of the double-bottle MEC reactor is 600mL and the effective volume is 500mL. The anode of the MEC reactor is a carbon brush, the cathode is made of stainless steel mesh, and the inocul...

Embodiment 3

[0052] (I) Neutral Fenton conditioning: take 500mL of TS content of 12.5g / L residual sludge and place it in a beaker, add 10mM FeCl 3 Add 32.5mL of 10mM protocatechuic acid solution immediately after 21mL of the solution, stir rapidly for 60s, then add 2.4mL of 30% H 2 o 2 , stirring rapidly for 30s, then stirring slowly for 2h;

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

[0054] (Ⅲ) MEC microbial domestication: The total volume of the double-bottle MEC reactor is 600mL and the effective volume is 500mL. The anode of the MEC reactor is a carbon brush, the cathode is made of stainless steel mesh, and the inoculum is effluent from a stable MEC. 1.5g / L sodium acetate is used as carbon source, 1.0V voltage is applied, and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
06 Nov 2018
Publication
CN108751627A
IPC
C02F11/00; C02F11/04; C02F11/06; C12P3/00
CPC
C02F11/006; C02F11/04; C02F11/06; C02F2303/06; C12P3/00
Inventors
侯慧杰; 李珍