Device for treating a black and odorous water body with a bionic process

Abstract

The present application provides a device for treating a black and odorous water body comprising a pre-treatment unit, a biomimetic intestine tubular purification system which imitates a digestion of small intestine, a microbial fuel cell which imitates a digestion of large intestine, and an inclined tube sedimentation tank which imitates human excretion.

Claims

1. A device for treating a black and odorous water body comprising: (a) a pre-treatment unit for pre-treating the black and odorous water body, wherein the pre-treatment unit comprises a water pump, a water inlet, a water outlet, and barriers with different thicknesses for physically filtering the black and odorous water body, and a biological enzyme is added into the pre-treatment unit; (b) a tubular purification system which has an intestinal-like structure in communication with the pre-treatment unit, wherein the tubular purification system comprises a water pump, a water inlet, a water outlet and one or more tubular structures, each comprising an outer wall and a folded inner wall which imitates the inner wall of small intestine; villus-like structures which imitate small intestine villi are densely disposed on the folded inner wall; the villus-like structures are capable of providing support for intestinal probiotics; and an aeration unit is disposed at the bottom of the tubular structures, and is able to provide oxygen into the tubular structures; (c) a microbial fuel cell in communication with the tubular purification system, wherein the microbial fuel cell has two chambers, one comprising a microbial anode and the other comprising an air cathode; a glass fiber membrane is provided between the anode chamber and the cathode chamber as a proton exchange membrane; an external circuit connects the anode with the cathode through a conducting wire; a mixed microflora is attached to the surface of the anode, and can further degrade the organic materials in the water body treated by the tubular purification system under an anaerobic environment in the anode chamber; and the aeration unit disposed at the bottom of the tubular structure of the tubular purification system is capable of providing oxygen for the cathode chamber; (d) an inclined tube sedimentation tank in communication with the microbial fuel cell, wherein the inclined tube sedimentation tank comprises a water inlet, a honeycomb-like inclined tube sedimentation area, a water collecting tube, a water outlet, a sludge collecting bucket, a perforated sludge discharge tube, and a sludge tank; the water inlet is positioned below the honeycomb-like inclined tube sedimentation area and the water outlet is positioned above the honeycomb-like inclined tube sedimentation area; the honeycomb-like inclined tube sedimentation area comprises a plurality of inclined tube structures; the inclined tube structures are able to accumulate the suspended or solidified materials from the incoming water into a thin sludge layer on the bottom surface of the inclined tube structures; the thin sludge layer slides back to a sludge suspension layer under gravity, and then sinks into the sludge collecting bucket, and is discharged into the sludge tank via the perforated sludge discharge tube; and a supernatant rises to the water collecting tube and is discharged via the water outlet; (e) one or more solar cell panels; wherein the energy to be consumed by the device is from the energy generated by the one or more solar cell panels and the microbial fuel cell.

2. The device according to claim 1, wherein the biological enzyme added into the pre-treatment unit is a redox enzyme.

3. The device according to claim 1, wherein the water inlet of the tubular purification system is provided beneath the tubular structure, the water collecting tube is provided above the tubular structure, and the water outlet is provided on the water collecting tube.

4. The device according to claim 1, wherein the one or more solar cell panels are provided above the tubular purification system.

5. The device according to claim 1, wherein the outer wall of the tubular structures in the tubular purification system is made from a material selected from the group consisting of a polymeric material, and a conducting metal material.

6. The device according to claim 1, wherein the folded inner wall of the tubular structures in the tubular purification system is made from polypropylene or polyethylene, and the villus-like structures are made from positively charged carbon fiber.

7. The device according to claim 1, further comprising intestinal probiotics on the villus-like structures, wherein the intestinal probiotics comprise anaerobic bacteria, facultative bacteria, or aerobic bacteria.

8. The device according to claim 7, wherein at the starting of the tubular purification system, the intestinal probiotics comprise Phascolafctobacterium and Eubacterium eligens; on 12 to 15 days after the starting of the system, the intestinal probiotics comprise Bacteroides and Lachnospiraceae Roseburia; and on 180 days after the starting of the system, the intestinal probiotics comprise an intestinal butyric acid-producing bacteria.

9. The device according to claim 1, wherein the mixed microflora in the microbial fuel cell comprises Bacteroides and Lachnospiraceae Roseburia.

10. The device according to claim 1, wherein the top end of the inclined tube structure is inclined towards the water inlet.

11. The device according to claim 2, wherein the redox enzyme is glucose oxidase, glucose dehydrogenase, or ethanol dehydrogenase.

12. The device according to claim 5, wherein the polymeric material is glass fiber reinforced plastic, polyethylene, or polypropylene.

13. The device according to claim 5, wherein the conducting metal material is stainless steel.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic diagram of the device for treating a black and odorous water body with a bionic process according to the present disclosure. The device consists of the following 4 parts: A. a pre-treatment unit, B. a biomimetic intestine tubular purification system, C. a microbial fuel cell, and D. an inclined tube sedimentation tank.

DESCRIPTION OF REFERENCE NUMBERS FOR MAIN COMPONENTS IN THE DRAWINGS

(2) A. pre-treatment unit 1water pump; 2thin barrier; 3thick barrier; 4water inlet; 5biological enzyme; 6water outlet; B. biomimetic intestine tubular purification system 7water pump; 8tubular outer wall; 9tube inner cavity; 10folded small intestine inner wall; 11tiny villi; 12aerator; 13water inlet; 14water collecting multihole tube; 15solar cell panel; 16water outlet; C. microbial fuel cell 17water pump; 18water inlet; 19water outlet; 20anode, to the surface of which a mixed microflora or a special flora is adhered; 21anode chamber; 22proton exchange membrane; 23cathode; 24cathode chamber; 25oxygen inlet; 26electric appliance; D. inclined tube sedimentation tank 27water pump; 28water inlet; 29perforated sludge discharge tube; 30sludge bucket; 31inclided tube; 32water collecting multihole tube; 33water outlet; 34sludge tank; E. enlarged view of the biomimetic intestine tubular purification system F. sectional view of the inclined tube sedimentation tank

DETAILED DESCRIPTION

(3) The device of the present disclosure is placed in a black and odorous river channel and a river water is first pumped into the pre-treatment unit A from the bottom water inlet 4 by the water pump 1, physically filtered via the thick barrier 3 and the thin barrier 2 in the pre-treatment unit, adjusted to a certain pH, degraded by the biological enzyme 5, and pumped into the tube inner cavity 9 via the water inlet 13 from the water inlet 6 by the water pump 7. The river water moves upward along the inner cavity, and the organic materials are contacted with the folded small intestine inner wall 10, oxidized, degraded, and metabolized. At the same time, the bubbles produced by the aerator 12 are cut by the tiny villi 11 into small bubbles, which provide high concentration active oxidant for the small intestine tubular purification system B, enhancing the oxidation and degradation reaction. The treated river water is pumped into the microbial fuel cell C via the water outlet 16 and the water inlet 18 from the water collecting multihole tube 14 by the water pump 17. A metabolized intermediate product is degraded with a mixed microflora or a special flora adhered to the anode 20 in the anode chamber 21. The protons are transported to the cathode chamber 24 through the proton exchange membrane 22. The oxygen is introduced into the cell via the oxygen inlet 25 from the outside, and accepts the protons at the cathode 23. The cell is externally connected with the electrical appliance 26. A efficient power generation of the microbial fuel cell and an advanced treatment of river water are achieved.

(4) The aerator 12 is dually controlled in terms of the redox potential and dissolved oxygen. When the redox potential is more than 200 mv or the dissolved oxygen is more than 3 mg/L, the aeration is stopped. And when the redox potential is less than 0 mv or the dissolved oxygen is less than 1 mg/L, the aeration starts.

(5) At a beginning of starting of the biomimetic intestine tubular purification system B, microorganisms are added in an amount of 100 g/m.sup.3 river water, and the microorganisms are anaerobic bacteria and facultative bacteria, predominantly Phascolafctobacterium and Eubacterium eligens. On 12 to 15 days after the starting of the system, Bacteroides and Lachnospiraceae Roseburia are added in an amount of 120-150 g/m.sup.3 river water; and on 180 days after the starting of the system, an intestinal butyric acid-producing bacteria is added in an amount of 200-300 g/L.

(6) In the microbial fuel cell C, Bacteroides and Lachnospiraceae Roseburia are mainly added in an amount of 500 g/m.sup.3 river water. When the current density of the microbial fuel cell is less than 10 mA.Math.cm.sup.2, Bacteroides and Lachnospiraceae Roseburia are added in an amount of 200 g/m.sup.3 river water per addition.

(7) The treated river water is pumped into the inclined tube sedimentation tank D via the water inlet 28 from the water outlet 19 by the water pump 27. The bottom sludge is sedimented at the inclined tube 31, and then discharged into the sludge tank 34 via the sludge collecting bucket 30 and the perforated sludge discharge tube 29. Clean water is collected by the water collecting multihole tube 32 above, and discharged into the river channel via the water outlet 33.

(8) The energy generated by the microbial fuel cell C and the solar cell panel 15 is supplied to aeration and water body introduction systems, thereby achieving the energy self-supply of the device.

(9) The quality of the outgoing water treated by the device complies with grade IV water quality requirement of Environmental quality standards for surface water (GB 3838-2002). According to one embodiment of the present disclosure, after treating the incoming water from a black and odorous water body with a chemical oxygen demand (COD) of 85 mg/L, an ammonia nitrogen amount of 3.0 mg/L, and a total phosphorus amount of 0.6 mg/L according to the present disclosure, the chemical oxygen demand (COD) is reduced to 20 mg/L, the ammonia nitrogen amount is reduced to 1.1 mg/L, and the total phosphorus amount is reduced to 0.18 mg/L. The energy recovery rate is up to 40%.