Floating-bed plant coupling sediment microbiological fuel cell water purification method

A fuel cell and water purification technology, applied in biochemical fuel cells, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of many influencing factors, lack of continuity and stability, low power generation efficiency, etc., to achieve The effect of reducing pollution

Inactive Publication Date: 2016-01-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that there are many influencing factors, high development cost, low power production efficiency, lack of continuity and stability, and there is still a certain distance from practical application.
The power generation capacity and pollutant removal efficiency of SMFC are still very limited, mainly because: (1) the electrode spacing is large, resulting in a large internal resistance of SMFC; (2) the solubility of oxygen in the overlying water suspended by the cathode is low; (3) Over time, microorganisms and chemicals are deposited on the surface of the cathode; (4) The an

Method used

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  • Floating-bed plant coupling sediment microbiological fuel cell water purification method
  • Floating-bed plant coupling sediment microbiological fuel cell water purification method
  • Floating-bed plant coupling sediment microbiological fuel cell water purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The electricity generation performance of embodiment 1P-SMFC

[0040] Three types of plant-sediment microbial fuel cells (MFC-C.a), canna-sediment microbial fuel cell (MFC-C.i), and sediment microbial fuel cell (MFC-0) were constructed respectively. Purification system, after the system is successfully started, continue to add artificial wastewater to maintain power production. The voltage value can be regarded as a complete cycle after going through three stages of rising, steady and falling until it drops below 50mV. as follows figure 2 It is the change of voltage with time in one cycle and 24 hours after the three types of systems are successfully started. It can be seen from the figure that MFC-0, MFC-C.i and MFC-C.a can all present three stages of rising, stable and falling in a general trend within a power generation cycle, and the power generation performance of MFC-C.a is slightly higher than that of MFC-C.i and MFC-0.

Embodiment 2

[0041] Embodiment 2P-SMFC electricity production consumes organic matter in the substrate

[0042] Sediment and biogas residues contain abundant microorganisms, which play an important role in the transformation of organic matter. They mainly decompose organic matter through oxidation, reduction, and hydrolysis, and then degrade organic matter through the extracellular enzymes secreted by them, or absorb organic matter into cells and degrade them by intracellular enzymes. In the MFC-0, MFC-C.i and MFC-C.a systems, the removal of organic matter mainly depends on the action of these microorganisms and the release to the overlying water; in addition to these two methods, the addition of electrodes will promote the decomposition of organic matter.

[0043] Such as image 3 , the change of organic matter content in the sediment of each system. It can be seen from the figure that after one month, the organic matter content of MFC-0, MFC-C.i and MFC-C.a decreased significantly, exc...

Embodiment 3

[0045] The variation of substrate ammonium nitrogen content in embodiment 3P-SMFC

[0046] Figure 5 It is the change diagram of ammonium nitrogen in the sediment of each treatment group. It can be seen that the ammonium nitrogen content in each treatment group was significantly lower than that of the sediment (P0.05), but the ammonium nitrogen content decreased The amount is slightly lower than that of MFC-0. Among the five treatment groups, the reduction of ammonium nitrogen in the pure plant system C.i and C.a was significantly higher than that of MFC-0, MFC-C.i and MFC-C.a (P0.05), the reductions of the five were 42.03±3.28%, 47.07±2.58%, 22.22±0.42%, 13.33±2.21% and 14.76±6.30%. There was no significant difference in the change of ammonium nitrogen content between the treatment group based on windmill grass and the treatment group based on canna under the conditions of electrode and no electrode (P>0.05).

[0047] In the P-SMFC system, the removal of organic matter and...

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Abstract

The present invention relates to a microbial fuel cell water purification method, particularly to coupling of ecological floating islands and microbial fuel cells, wherein the method can be used for ecological restoration of contaminated river courses, lakes and parks, residential districts and other landscape water bodies, and belongs to the water body pollution remediation in environmental projects. According to the present invention, the black and odor river sediment or city sludge is adopted as the bottom matter, the carbon felt is adopted as the anode, and the graphite disc is adopted as the cathode to construct SMFC; floating-bed plants are introduced, and are planted on the overlying water body by using the floating body to form the floating-bed plant-sediment microbiological fuel cell (P-SMFC); with the combination of the floating-bed plant root system secretion characteristics, the root system secretions provide nutrients for the rhizospheric microorganisms; and the root system radially secretes oxygen to make the rhizospheric zone form a lot of aerobic zones, and the oxygen secreted by the plant root zone can spread to the SMFC cathode, such that the cathode region dissolved oxygen concentration is increased, and the restoration performance of the SMFC on the sediment pollution and the overlying water pollution are improved.

Description

Technical field: [0001] The invention relates to the field of fuel cell water purification, in particular to a water purification method for floating bed plants coupled with sediment microbial fuel cells. Background technique: [0002] The use of organic matter in seabed sediments to generate electricity is called "unattended submarine generator", and water pollution remediation technology based on sediment microbial fuel cells (SMFC) has gradually developed. In SMFC, the anode is usually placed in the anoxic bottom sediment, while the cathode is suspended in the oxygen-containing water above the anode. The cathode and anode are connected by wires and connected to a resistor to form a closed loop. Under the catalysis of anaerobic microorganisms, the organic matter in the sediment is oxidized in the anode area, and the generated electrons pass through the cell membrane to the anode, and then transfer to the cathode through an external circuit. On the other hand, the hydrogen...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34H01M8/16C02F101/16
CPCY02A20/402Y02E60/50
Inventor 张太平陈满英扈华庚王健朱娟平黄永芳
Owner SOUTH CHINA UNIV OF TECH
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