US 2019/0319288 A1 · PREPARATION OF A NEW TYPE OF COMPOSITE ANODE AND MICROBIAL FUEL CELL BASED ON NITROGEN DOPED BIOLOGICAL CARBON AND POROUS VOLCANIC ROCKS

Abstract

A preparation method for a novel composite anode based on nitrogen-doped charcoal of sludge and porous volcanic, and a microbial fuel cell, relating to the technical field of resource utilization of new materials, new energy and wastewater. Active sludge is prepared into porous nitrogen-doped charcoal by using a nitrogen high-temperature pyrolysis baking method; and then, surface minerals are removed by using an acidification method to improve the electrical conductivity of the charcoal; finally, surface charcoal loading is performed by taking volcanic granules as a carrier to prepare and form nitrogen-doped charcoal granules on a volcanic surface. The novel granules have high porosity, high electrical conductivity and large specific surface area, and fully meet the performance requirement of the anode material of the microbial fuel cell. The anode of the novel nitrogen-doped porous charcoal can increase the loading capacity of electricity-producing bacteria and microorganisms of the anode of the microbial fuel cell, and improve the conversion rate of biomass energy in wastewater; by virtue of low-resistance characteristics, the electron transfer efficiency is also improved, and finally, the power of the microbial fuel cell is enhanced, so that both wastewater treatment and recycling and efficient biological power generation are achieved.

Claims2

Dependent claims

The new preparation method characteristics of the novel composite anode doped nitrogen based on the biological carbon and porous volcanic rocks were as follows:

(1) Activated sludge was dried by vacuum drying at constant temperature;
After drying, the sludge was roasted and calcined for 4-6 hours at 600˜700 C, and then slowly heated up and nitrogen was added without oxygen, dry powder sludge was prepared;
(2) The obtained dry sludge and more than 50% concentration hydrofluoric acid were mixed, the quality ratio was more than 1:2 of the dry sludge powder and hydrofluoric acid, the mixed powder was removed after stirring 1˜3 h, and then washed with deionized water to neutral, porous carbon powder doped nitrogen was made;
(3) After drying at 60° C. for 8-12 hours at constant temperature, the porous carbon powder doped nitrogen was taken out for reserve;
(4) The volcanic rock particles with more than 40% porosity were selected for purge and deionized water cleaning;
(5) Using PVDF as binder, PVDF and dry porous obtained carbon powder doped nitrogen were mixed in DMF, and then volcano rock particles were added, so porous carbon powder doped nitrogen was evenly coated on the outer surface of the volcano rock particles after processing and mixing, biochar particles in the core of volcanic rocks were prefabricated by phase inversion method;
the particles were baked for 4-6 hours at 600-700° C., nitrogen was inputted while isolated oxygen during the period, new porous carbon particles doped nitrogen were inoculated with Shewanella, which was a novel composite anode sludge biological porous carbon doped nitrogen based on volcano rock.

4 more elements

The new MFC using the novel composite anode doped nitrogen based on the biological carbon and porous volcanic rocks were as follows:

The biological carbon doped nitrogen based on porous volcano rock was filled in the anodic chamber of MFC as electrode, the filling rate was 95-100%;
Carbon rods were inserted in the novel composite anode porous biological carbon doped nitrogen, and titanium wire on the top of the carbon rods was connected with data collection system;
A water inlet was set on the top of anodic chamber, hydraulic transmission was performed using gravity flow model;
The gas check valve was arranged at the top end of the anode chamber;
the saturated calomel reference electrode was inserted into the biological carbon, which was connected to external data collection system;
The anode chamber and the cathode chamber are designed from top to bottom, the chambers were separated by nonwoven fabrics;
Activated carbon was used as air cathode catalyst of cathode chamber, PVDF membrane coated on the carbon cloths, connecting with data collection system;
The external resistance was connected between the cathode and the anode.
The invention belongs to the technical field of the utilization of new energy and new materials and water resources. Firstly, activated biological sludge was prepared into porous biological carbon doped nitrogen by nitrogen pyrolysis baking method, and then by acidification method to remove the surface of minerals for enhancing the conductivity of biochar, the biological carbon was loaded on the surface of the volcano rock particles as the carrier at last, so the biological carbon particles doped nitrogen were prepared. These new particles have a lot of advantages, such as high porosity, good conductivity and large surface area, which properties meet the anodic performance requirements of microbial fuel cell. The new biological porous carbon anode doped nitrogen not only can increase attached bacteria and microbial quantity of the anode of microbial fuel cell, but increase biomass conversion rate in wastewater, lower resistance, and improve the electron transfer rate of MFC. The above technical advantages can significantly improve the power of the microbial fuel cell, and realize the waste water treatment resource and the high efficiency biological electricity production at the same time.

6 more elements

Dependencies are inferred from the claim text.

Preparation of a new type of composite anode and microbial fuel cell based on nitrogen doped biological carbon and porous volcanic rocks

Life of this patent

Preparation of a new type of composite anode and microbial fuel cell based on nitrogen doped biological carbon and porous volcanic rocks

Life of this patent

Abstract

Claims2