227 results about "Microbial electrolysis cell" patented technology

The invention discloses a microbial electrolysis cell integrating functions of CO2 conversion and sewage treatment, which comprises a microbial electrolysis cell shell, the inside of the microbial electrolysis cell shell is provided with an anion / cation exchange membrane for dividing the microbial electrolysis cell shell into an anode chamber and a cathode chamber, the insides of the anode chamber and the cathode chamber for accommodating to-be-treated sewage are respectively provided with an anode and a cathode which are connected with an external power supply, the inside of the cathode chamber is also provided with a reference electrode for controlling the electric potential of the cathode, the upper end of the cathode chamber is provided with a cathode product outlet, and the anode chamber is communicated with the cathode chamber by an air-guide tube. In the invention, sewage is fed into the anode chamber and used as a nutrient source for the growth of various microbes, and at room temperature, the microbes carry out catabolism on organic matters in the sewage so as to achieve a wastewater treatment process. In the CO2 capturing and conversion process, CO2 released by the anode is fed into the cathode chamber by the air-guide tube, then under the catalytic action of bacteria in the cathode chamber, an effect of CO2 capturing and an effect of converting the CO2 into CH4 are achieved.

The invention discloses a device and method for quickly measuring a BOD (biochemical oxygen demand) based on a microbial electrolysis cell technology. The device adopts a microbial electrolysis cell structure and comprises a microbial electrolysis cell, a data acquisition system and a record cell, wherein the microbial electrolysis cell takes conductive inert materials as an anode electrode and a cathode electrode which are connected with each other through a titanium wire, a potentiostat and a resistor; the data acquisition system is connected in parallel with the resistor; the record cell is connected with the data acquisition system. The method comprises the following steps of: adding a BOD contained sample into the microbial electrolysis cell; measuring electrochemical signals generated by the microbial electrolysis cell; and determining the BOD of the sample according to the relation between the BOD concentration and the size of the electrochemical signals (indicating the maximum current and coulomb quantity) generated by the microbial electrolysis cell. The device and the method have the advantages of high sensitivity, wide linearity range, short detection time, and the like, can be used for measuring the BOD of sewage in an on-line or off-line manner.

The invention discloses a method for recovery of elemental cobalt from lithium cobaltate by a microbial fuel cell (MFC) self-driven microbial electrolysis cell (MEC) coupled system. The method is characterized in that an MFC anode is directly connected to an MEC cathode; an MFC cathode is connected to an MEC anode by a resistance; an MFC cathode chamber is filled with a cathode liquid and lithium cobaltate particles; an MFC anode chamber is inoculated with sludge as an electrochemical activity microbe source in a clarification pool of a sewage treatment plant, an MEC cathode chamber is filled with a Co(II)-containing aqueous solution; an MEC anode chamber is inoculated with the sludge as an electrochemical activity microbe source in a clarification pool of a sewage treatment plant; and anode and cathode materials are graphite materials. The method provides an effective approach for in-situ utilization of MFC output electric energy and provides a wide space for extra electric energy input-free and cathode liquid acidity limit-free MEC application.

The invention discloses an enhanced denitrification method and device for a coupled microorganism electrolytic tank of a downstream vertical flow artificial wetland. The enhanced denitrification method comprises the following steps: (A) water is uniformly distributed on the top of a system, and waste water firstly flows into an upper non-conductive filler layer; (B) waste water flows into an anodic conductive filler layer, and unoxidized organic matters are removed in the anodic conductive filler layer; (C) then waste water flows into a non-conductive filler isolating layer which is a separator between a cathodic conductive filler layer and the anodic conductive filler layer; (D) waste water flows into the cathodic conductive filler layer to generate an autotrophic denitrification process; and (E) waste water is drained through a bottom draining pipe. The anodic conductive filler layer is connected with the bottom communication filler layer and the non-conductive filler isolating layer, respectively, the anodic conductive filler layer is connected with the non-conductive filler isolating layer and the upper non-conductive filler layer, respectively, and cathodic and anodic collector electrodes are respectively placed in the cathodic conductive filler layer and the anodic conductive filler layer. The enhanced denitrification method has the beneficial effects that the operation is simple, and the removal efficacy of the downstream vertical flow artificial wetland to low-carbon and high-nitrogen wastewater is substantially improved.

The invention discloses a treatment method for dyeing wastewater. The method is characterized by comprising the following steps: configuring a microbial electrochemical coupling system which couples a microbial fuel cell (MFC) and a microbial electrolysis cell (MEC); and adding dyeing wastewater to be treated into the cathode chamber of the MEC for degradation. According to the method, the MFC and the MEC are connected in series, the MFC supplies the MEC with electric energy used for degrading the dyeing wastewater, supply of extra voltage to the MEC for improvement of degradation efficiency of the dyeing wastewater is not needed, so energy is saved; combination of the MFC and the MEC improves efficiency of the individual MFC in degradation of the dyeing wastewater.

Systems and methods for microbial processes of generating products such as electrical power, hydrogen gas and methane, are provided according to aspects of the present invention which include a reaction chamber having a wall defining an interior of the reaction chamber and an exterior of the reaction chamber; an anode at least partially contained within an anode compartment of the reaction chamber; a plurality of exoelectrogenic microorganisms disposed in the anode compartment; a cathode at least partially contained within a cathode compartment of the reaction chamber; a conductive conduit for electrons in electrical communication with the anode and the cathode; and a reverse electrodialysis stack comprising a plurality of plurality of alternating anion selective barriers and cation selective barriers disposed between the anode and the cathode defining one or more saline material compartments and one or more lower-saline material compartments.

The invention provides a method for realizing methanogenesis with surplus sludge by utilizing a microbial electrolytic tank, relates to a method for methanogenesis, and aims at solving the problems that a conventional fermentation method cannot completely utilize surplus sludge and is longer in time. The method comprises the following steps: firstly, taking surplus sludge as a substrate for acclimatization of anode functional microorganism and starting a microbial electrolytic tank reactor; and secondly, under the condition that the electrolytic tank is stable, taking the surplus sludge as the substrate for methanogenesis. The method completely utilizes the surplus sludge, and is short in reaction time; the methanogenesis rate is 0.10-0.25m<3>H2 / m<3>.d; and the protein removal rate is as high as 38%-58%, and the COD (chemical oxygen demand) removal rate is up to 38%-55%. Due to the higher removal rates of the protein and COD, the method for treating surplus sludge through the microbial electrolytic tank technology and recycling the energy product methane with higher economic value has the characteristic of combining productivity with reduction of environmental pollution.

The invention belongs to the technical field of composite materials, and particularly relates to an Mo / Ni / Co / P / C composite material as well as a preparation method and an application thereof. The material is prepared with the following method: in a three-electrode system, a carbon-based substrate taken as a working electrode, a platinum net taken as an auxiliary electrode and Ag / AgCl taken as a reference electrode are connected with an electrochemical workstation, potentiostatic deposition is conducted in a mixed solution of nickel sulfate with concentration of 30-70 g / L, sodium hypophosphitewith concentration of 20-40 g / L, nickel chloride with concentration of 10-20 g / L, boric acid with concentration of 30-35 g / L, cobalt chloride with concentration of 30-50 g / L and sodium molybdate withconcentration of 40-50 g / L, magnetic stirring is conducted throughout the deposition process, initial potential set on the working electrode during electroplating is (-1.5)V-(-1)V, electroplating timeis 5-30 min, electroplating temperature is set to be 25-35 DEG C, a power supply is turned off finally, and the Mo / Ni / Co / P / C composite material is prepared. The Mo / Ni / Co / P / C composite material is taken as a cathode material of a microbial electrolytic cell to treat coking wastewater and produce hydrogen synchronously, waste is changed into treasure, and a new idea and a new perspective are provided for impending coking wastewater treatment.

The invention discloses a method and apparatus for intensifying denitrification in a coupling microorganism electrolytic tank of an upstream vertical flow artificial wetland. The method comprises the following steps: A, uniformly distributing water at the bottom of a system, raising waste water in a pushing flow manner along a bottom non-conducting filler layer firstly; B, enabling the waste water to flow in an anode conducting filler layer; C, then enabling the waste water to flow in a non-conducting filler isolated layer which is a separator between a cathode conducting filler layer and the anode conducting filler layer; D, enabling the waste water to flow in the cathode conducting filler layer, and carrying out autotrophic denitrification removal on nitrate nitrogen; and E, enabling the waste water to flow out of a drain pipe in the upper non-conducting filler layer. The anode conducting filler layer is connected with the non-conducting filler isolated layer and the bottom non-conducting filler layer respectively, the cathode conducting filler layer is connected with the upper non-conducting filler layer and the non-conducting filler isolated layer respectively, and a cathode collector and an anode collector are placed in the cathode conducting filler layer and the anode conducting filler layer respectively. The operation is simple, and the removal capability of the upstream vertical flow artificial wetland for the waste water containing low carbon and high nitrate nitrogen is greatly improved.

The invention relates to the field of microorganism electrolytic tank cathode materials, in particular to a preparation method of an ordered mesopore cathode composite of MEC. P123 is adopted as a template agent, tetraethoxysilane (TEOS) is adopted as a silicone source, and a mesoporous molecular sieve SBA-15 is obtained through synthesis. Mesoporous silica SBA-15 is adopted as a hard template, the hard template is filled with a precursor nickel source and a cobalt source different in molar ratio through the nanometer casting technology, after roasting at different temperatures, a catalyst isput in alkali liquor to be stirred to remove the template, and metal oxide with an ordered mesopore structure is prepared. The preparation method is simple, operation is easy, cost is low, dependencyon precious metal Pt is greatly reduced, and wide application prospects are achieved in the field such as microorganism electrolytic tank waste water treatment. The mesopore metal oxide NiCo2O4 is adopted as a cathode catalyst of the MEC, the specific surface area of an electrode is increased, an ordered mesopore channel is formed, the chemocatalysis function can be achieved synchronously, and electron transfer can be accelerated.