Method for coupling rhamnolipid strengthened sludge pre-treatment and microorganism electrolysis to produce hydrogen

Abstract

The invention discloses a method for coupling rhamnolipid strengthened sludge pre-treatment and microorganism electrolysis to produce hydrogen. The method comprises the following steps: (1) adjusting the concentration of residual sludge of a secondary sedimentation tank to be 10g / L to 20g / L for later use; adding 0.04g / g VSS to 0.10g / g VSS of rhamnolipid and refrigerating for later use; (2) carrying out nitrogen aeration on the sludge which is pre-treated by the rhamnolipid to remove oxygen; fermenting the sludge at constant temperature of 30 DEG C to 37 DEG C; after fermenting, taking out the sludge and carrying out solid-liquid separation; taking supernatant as a fermentation solution for later use; (3) inoculating and starting a single-pole-compartment MEC reactor by utilizing the sludge subjected to the solid-liquid separation in step (2); additionally applying voltage of 0.6V to 1.2V and externally connecting a 10ohm resistor, wherein a distance between electrodes is 0.5cm to 2.0cm; after successfully starting the reactor, replacing a culture solution with the fermentation solution in step (2) and starting a rapid hydrogen production process. Compared with traditional sludge fermentation and hydrogen production, the method has the characteristics of short fermentation period and high hydrogen yield of unit sludge.

Description

technical field [0001] The invention relates to a method for intensive pretreatment of sludge by using rhamnolipid coupled with microbial electrolysis hydrogen production. Background technique [0002] As an associated product of sewage treatment, excess sludge has brought serious secondary pollution. Faced with the increasing output of surplus sludge, a single landfill treatment is no longer enough to meet the demand. The current status of water treatment determines that the reasonable disposal of sludge must be carried out in the direction of sludge reduction and resource utilization. Hydrogen production from excess sludge is a new method for sludge reduction and resource utilization, which can effectively degrade organic matter in sludge and generate clean energy hydrogen at the same time. The calorific value of hydrogen combustion is 2.77 times that of gasoline. After combustion, only water is generated without secondary pollution. Therefore, it has broad application p...

AI Technical Summary

Problems solved by technology

The calorific value of hydrogen combustion is 2.77 times that of gasoline. After combustion, only water is generated without secondary pollution. Therefore, it has broad application prospects. However, this method has poor hydrogen production stability and low hydrogen purity. The hydrogen in the sludge system will Rapidly utilized by other microorganisms, resulting in the loss of hydrogen

In addition, the organic matter in the sludge mainly exists in the sludge floc, and the difficulty of breaking the wall of the sludge floc makes the dissolution of organic matter limited.

These have always limited the development of this technology

[0003] At present, the traditional two-phase anaerobic hydrogen production process has been well developed, but there are still problems such as complicated process control, poor stability of hydrogen production, and low hydrogen production rate.

However, based on the difficulty of cracking sludge flocs, it is necessary to adopt effective pretreatment methods. The current process cannot break through these limitations through process control.

Images