System and method by utilizing fuel cell to treat organic wastewater and synchronously repair soil heavy metal

Abstract

The invention discloses a system and a method by utilizing a fuel cell to treat organic wastewater and synchronously repair heavy metal in soil. The system comprises a microbiological fuel cell, a data acquisition regulation and control device and a soil electrodynamic remediation device. One end of the data acquisition regulation and control device is connected with an anode unit and a cathode unit through lead wires correspondingly; the other end of the data acquisition regulation and control device is connected with a negative electron and a positive electrode through lead wires correspondingly; and the data acquisition regulation and control device is used for acquiring a voltage signal generated by the microbiological fuel cell and for regulating and controlling the magnitude of electric current received by the soil electrodynamic remediation device. By utilizing the microbiological fuel cell to treat organic wastewater, wastewater is treated, and electric energy is generated to remove the heavy metal in the soil; the system and the method do not damage a soil structure and the organic content in the soil is not affected; and at the same time, the data acquisition regulation and control device is adopted, so that the electric energy utilization efficiency of the microbiological fuel cell is improved effectively and the removal rate of the heavy metal in the soil is reduced.

Description

technical field [0001] The invention belongs to the field of microbial electrochemistry, and in particular relates to a system and a method for synchronously repairing heavy metals in soil with a fuel cell for treating organic wastewater. Background technique [0002] At present, my country's soil environment is generally not optimistic, and soil pollution in some areas is relatively serious, which has seriously affected people's production and life. In recent years, the incidents of "blood lead", "cadmium rice" and "arsenic poisoning" have made soil heavy metal pollution attract widespread attention. According to the "National Soil Pollution Survey Bulletin" (2014), the total excess rate of soil in the country is 16.1%, and the pollution type is mainly heavy metals. The over-standard rates of mercury, arsenic, copper, lead, chromium, zinc, and nickel were 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%, 0.9%, and 4.8%, respectively. Therefore, it is of great significance to develop an...

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Problems solved by technology

Its disadvantage is that after the organic matter in the soil is degraded at the anode, it is easy to cause a decrease in soil fertility, which is not conducive to the subsequent cultivation of the soil. The difference in the composition and content of organic matter in the soil environment will also have a significant impact on the power generation performance of MFC. The presence of heavy metals can also have a toxic effect on electrogenic bacteria

In addition, the strict anaerobic environment of the anode needs to be maintained during the power generation process, and the operation and maintenance are cumbersome

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