Device and method for desalination of cylindrical bio-cathode microbial desalination fuel cell

[0024] Specific implementation mode one: as figure 1 As shown, a cylindrical biocathode microbial desalination fuel cell desalination device, the device includes an external resistance 1, an external circuit 2, an anolyte outlet 3, a cathode and a cathode biofilm 4, a catholyte 5, and a cation exchange membrane 6 , desalination chamber 7, catholyte water inlet 8, catholyte water outlet 8a, cathode chamber top cover 9, anion exchange membrane 10, anode and anode biofilm 11, anolyte 12, tubular reactor shell 13, anolyte water inlet 14. Aeration head 15, bracket 16 (made of plexiglass material), water inlet 17 of desalination chamber (made of plexiglass material), water outlet 18 of desalination chamber (made of plexiglass material);

[0025] The reactor is a sleeve-shaped structure, the bottom end of the reactor is a closed end, and the top end is an open end. The reactor is made of a cylindrical reactor shell 13 (made of plexiglass, with a thickness of 5 mm), and a cation exchange membrane 6. The inner cover and the outer cover made of the anion exchange membrane 10 are composed, and the inner cover, the outer cover and the cylindrical reactor shell 13 are sequentially set from the inside to the outside, and the inner cover and the outer cover are all connected to the bottom surface of the cylindrical reactor shell 13. The outer shell 13 of the tubular reactor is supported by a bracket 16, and the space between the inner sleeve and the outer sleeve is the desalination chamber 7 (the distance between the inner sleeve and the outer sleeve is 10mm), and NaCl solution is added to the desalination chamber 7, NaCl The concentration of the solution is 5-35 g/L (the higher the concentration, the greater the desalination rate); the lower part of the desalination chamber is provided with a desalination chamber water inlet 17, and the upper part of the desalination chamber is provided with a desalination chamber water outlet 18; the jacket and the cylindrical reaction The space between the reactor shells 13 is the anode chamber (the distance between the outer jacket and the reactor shell 13 is 10 mm), the space of the inner sleeve is the cathode chamber (the radius of the cathode chamber is 30 mm), and the top of the cathode chamber is equipped with a cathode chamber top Cover 9 (the diameter of the top cover 9 of the cathode chamber is 60mm), the cathode and the cathode biofilm 4 (the cathode material can be carbon brush, carbon felt and other materials based on carbon fiber) are arranged in the cathode chamber, and the cathode chamber is filled with catholyte 5 , the bottom of cylindrical reactor shell 13 is provided with the catholyte water inlet 8 that communicates with the cathode chamber, and the catholyte water outlet 8a that communicates with the cathode chamber is provided on the cathode chamber top cover 9, and the aerator head 15 is installed on The bottom of the shell 13 of the cylindrical reactor communicates with the cathode chamber (the lower part of the aeration head is connected to the aeration pump), the anode and the anode biofilm 11 (the material of which can be the same as that of the cathode) are arranged in the anode chamber, and the anode chamber is filled with anolyte 12. An anolyte water outlet 3 and an anolyte water inlet 14 communicated with the anode chamber are provided at the upper end and the lower end of the side wall of the cylindrical reactor shell 13 in turn, and the cathode and the anode are respectively connected to the external circuit 2 with titanium wires. The external resistance 1 is arranged between the cathode and the anode and is connected with the wire of the external circuit 2 .

[0026] Specific implementation mode two: as figure 1 As shown in the specific embodiment 1, the cylindrical biocathode microbial desalination fuel cell desalination device, the resistance value of the external resistance 1 at startup is 500~2000Ω, and the resistance value at the operation stage is 10~200Ω.

[0027] Specific implementation mode three: as figure 1 As shown, the device for desalination of the tubular biocathode microbial desalination fuel cell described in the specific embodiment one or two, the composition and proportioning of the catholyte 5 are NaHCO 3 2 g/L, KH 2 PO 4 4.4 g/L, K 2 HPO 4 •3H 2 O 3.4 g/L, NH4 Cl 1 g/L, MgCl 2 •6H 2 O 0.1 g/L, CaCl 2 • 2H 2 O 0.1 g/L, yeast extract 0.1 g/L and trace metal solution 10 mL; the composition and proportioning of the trace element metal solution are: NiCl 2 ·6H 2 O0.024 g/L; Na 2 WO 4 2H 2 O 0.025 g/L; Na 2 MoO 4 0.025 g/L; FeSO 4 ·7H 2 O 0.1 g/L; CaCl 2 2H 2 O 0.1 g/L; CoCl 2 ·6H 2 O 0.1 g/L; CuSO 4 ·5H 2 O 0.01 g/L; KAl(SO 4 ) 2 12H 2 O 0.01 g/L; Boric acid 0.01 g/L; Zinc chloride 0.13 g/L; Manganese sulfate 0.5 g/L; Nitrilotriacetic acid 2.0 g/L; Magnesium sulfate 3.0 g/L;

[0028] The composition and proportioning ratio of the anolyte are: sodium acetate 1.64 g/L, KH 2 PO 4 4.4g/L, K 2 HPO 4 •3H 2 O3.4 g/L, NH 4 Cl1g/L, MgCl 2 •6H 2 O 0.1g/L, CaCl 2 • 2H 2 0.1 g/L, yeast extract 0.1g/L and trace metal solution 10mL; The composition and proportioning of described trace metal solution are identical with the trace element metal solution of catholyte 5.