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

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...

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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 pretreatment and MEC can accelerate the process of anaerobic digestion of excess sludge, efficiently destroy the structure of extracellular polymers and macromolecular organic matter in sludge flocs, and improve the utilization rate of organic matter in excess sludge , to promote the recovery of high value-added substances and energy; and, the present invention also further optimizes the parameter conditions (comprising the type and proportioning of reactants, the temperature, time and pH value environment, etc.) of the neutral Fenton conditioning process, which can Reduce raw material H 2 o 2 Consumption, and reduce the amount of acid, reduce sludge subsequent treatment steps

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