Microbial electrochemical bioturntable for sewage treatment

Abstract

The invention relates to the technical field of sewage treatment and provides a microbial electrochemical biological turntable for sewage treatment. It includes a three-dimensional carrier, a rotating shaft and a power device; the three-dimensional carrier is arranged on the rotating shaft, and the rotating shaft is connected to the power device; it is characterized in that: anaerobic electricity-generating microbial film and aerobic microbial film are attached to the three-dimensional carrier, wherein the anaerobic electricity-generating The microbial film grows on the inner layer close to the carrier, while the aerobic microbial film grows on the outer layer to wrap and protect the anaerobic electricity-producing microbial film; the three-dimensional carrier is partly immersed in sewage and partly exposed to the air. The electrons inside the biological turntable can be self-transferred, and can synergistically remove electron donors and electron acceptors in water. The electron donors include organic matter and ammonium nitrogen, and the electron acceptors include nitrate nitrogen, nitrite nitrogen, sulfate and heavy metal ions.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a microbial electrochemical biological turntable for sewage treatment. Background technique [0002] Water is the basis for the survival of all living things and human beings. With the acceleration of urbanization and industrialization in our country, the scope and degree of water pollution are expanding and deepening, which has become the main factor restricting the sustainable development of society, economy and environment. In order to solve the problem of water pollution, sewage treatment technology came into being. [0003] Commonly used municipal and industrial wastewater treatment technologies mainly include two processes: (1) aerobic biological treatment to remove waste organic matter (chemical oxygen demand, COD) in sewage, such as activated sludge method, biofilm method, etc.; (2) Anaerobic denitrification to remove nitrogen and anaerobic digestion to remove ...

AI Technical Summary

Problems solved by technology

However, the use of these METs in actual sewage treatment has been greatly limited, mainly in the following aspects: (1) The performance of METs in treating actual sewage is low, and when municipal sewage is used as fuel, the highest power generation power of MFC Only about 1.5W m -2 ; the main reasons include lower sewage conductivity (approximately 1mS / cm) and lower organic matter concentration, biofouling and salt deposition at the air cathode and proton accumulation at the anode and hydroxide at the cathode

Moreover, when the voltage output of the MFC is increased by series connection, it also faces the problem of voltage inversion.

Lower performance usually results in lower decontamination efficiency

(2) MET devices such as MFC usually contain an anode and a cathode, which need to be separated by a diaphragm due to the difference in the required environment, which will bring higher material and operating costs to METs

(3) The anode of METs requires a relatively strict anaerobic environment to improve the electricity production performance of electrogenic microorganisms, so it is difficult to directly integrate with traditional aerobic microbial treatment systems

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