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Method for treating polluted river water by utilizing plant-sediment microbial fuel cell

A technology of fuel cells and microorganisms, applied in biological water/sewage treatment, electrochemical water/sewage treatment, chemical instruments and methods, etc., which can solve the problems of inability to remove pollutants from the root, short chemical restoration period, and environmental condition requirements Relatively high-level problems, to achieve the effect of improving oxidation-reduction potential, increasing aesthetics, and improving repair performance

Inactive Publication Date: 2019-05-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical restoration has a short cycle and fast speed, but it requires a large amount of chemical agents, which cannot remove pollutants from the root cause, resulting in huge capital investment and may cause secondary pollution; physical restoration is not effective when used alone, and has a negative impact on environmental conditions, etc. The requirements are relatively high, generally used as pre-treatment measures

Method used

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  • Method for treating polluted river water by utilizing plant-sediment microbial fuel cell
  • Method for treating polluted river water by utilizing plant-sediment microbial fuel cell
  • Method for treating polluted river water by utilizing plant-sediment microbial fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Put 12cm thick bottom mud into the bottom of a transparent plastic cuboid container (length 60, width 30, height 40cm) with a total volume of 45L, and add 18cm deep artificial simulated sewage above the bottom mud to simulate polluted river water. Drill a small hole with a diameter of 0.2 cm at a distance of 5 cm from the bottom of the container to pass through the wire connected to the anode. Place a high-density polyethylene floating bed on the surface of the overlying water, and equip a planting basket. The planting basket is filled with a sediment matrix mixed with quartz sand with a particle size of 2-3mm in a ratio of 1:1, and plant emergent plants in the planting basket. An anode is set at 5cm of the bottom mud of the polluted water body, so that the concentration of sulfur ions in the upper and middle bottom mud where most of the pollutants are concentrated is improved, and it is also beneficial for plants to take root in the bottom mud. The anode structure is a...

Embodiment 2

[0051] A device for in-situ restoration of polluted river water by using plant-sediment microbial fuel cells, the device is from top to bottom: cathode plate 1, floating bed floating plate 2, emergent plants 3, planting basket 4, matrix 5, polluted water Layer 6, wire 7, resistor 8, submerged plant 9, sediment layer 10, anode 11. The cathode plate 1 is covered on the floating plate 2 of the floating bed, and the planting basket 4 and the substrate 5 are arranged on the floating plate of the floating bed, and the emergent plants 3 are planted on the floating bed 2 of the floating plate through the substrate 5 . The anode 11 is a three-dimensional spherical network structure, located 5-8cm below the bottom mud layer 9, the roots of the submerged plants 9 are rooted in the bottom mud layer 10 through the anode 11, one end of the external wire 7 is connected to the cathode plate 1, and the other end is connected to the external wire 7. Resistor 8 is connected to anode 11, forming ...

Embodiment 3

[0062] Run the P-SMFC device in embodiment 2, connect DC probe and data collector on the two poles of P-SMFC and carry out real-time collection with the frequency of 3min / time, automatically record in the computer by USB interface, generate to system with this The voltage is automatically collected. At the same time, set the SMFC system without adding aquatic plants, and connect the data collector with the P-SMFC system to automatically collect the output voltage at a frequency of 3min / time.

[0063] Figure 4 , Figure 5 It reflects the change of output voltage of P-SMFC and MFC system after 40 days of operation. The output voltage of the two systems is relatively stable in the early stage of operation. With the extension of operation time, the range of output voltage change becomes larger.

[0064] During the operation of the system, the output voltage of P-SMFC fluctuates in the range of 0.34-0.47V in the whole operation stage, the output voltage of SMFC fluctuates in the...

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Abstract

The invention provides a method for treating polluted river water by utilizing a plant-sediment microbial fuel cell, and belongs to the technical field of ecological restoration. The method comprisesthe following steps: sediment in the position of 3-5 cm depth of a shoal of a polluted river is taken, grinding is performed, sieving is performed, and the sieved material and quartz sand are mixed according to a ratio of 1:1 as a substrate; anode plates are arranged in the position of 5-8 cm below the sediment of the polluted river, and submerged plants are rooted in the sediment through anodes;floating bed floating plates suspended on a water surface are arranged at a water-air interface, and each cathode plate with a same size and shape as one corresponding floating plate covers the upperpart of the floating plate; each planting basket is arranged on one corresponding floating bed floating plate, the substrate is added into the baskets, and emergent plants are planted on the floatingbeds through the substrate; and finally, the anode and cathode plates are connected by using an external conductor and external resistors to form a current loop. According to the method provided by the invention, oxygen in the air can be continuously supplemented to the cathode, and oxygen loss of the emergent plants on the floating beds diffuses to the cathode, so that stability of system power output and repair performance of the plant-sediment microbial cell to a polluted water body are improved.

Description

technical field [0001] The invention relates to the technical field of ecological restoration, in particular to a method for treating polluted river water with a plant-sediment microbial fuel cell. Background technique [0002] With the development of water body restoration technology in recent years, the pollution status of river water sediments has become one of the important factors to measure water quality. When the water body environment changes, the pollutants in the sediment will be released into the water body, which will aggravate the water body pollution. The sulfide content of the sediment is one of the important indicators to measure the pollution status of the sediment. Most of the river sediment is in a reduced state, and there are a large number of anaerobic microorganisms such as sulfate-reducing bacteria. These microorganisms reduce sulfate to sulfide, resulting in the release of phosphate, resulting in endogenous pollution. High concentrations of sulfide a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/32C02F1/46
Inventor 林海董颖博李冰贺银海薛宇航
Owner UNIV OF SCI & TECH BEIJING
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