Microbial electrochemical biological rotating disk for sewage treatment

Abstract

The invention relates to the technical field of sewage treatment, and provides a microbial electrochemical biological rotating disk for sewage treatment. The rotating disk comprises 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 with the power device; the rotating disk is characterized in that an anaerobic electrogenesis microbial film and an aerobiotic microbial film are adhered on the three-dimensional carrier, wherein the anaerobic electrogenesis microbial film grows on aninner layer which clings to the carrier, wherein the aerobiotic microbial film grows on an outer layer to wrap and protect the anaerobic electrogenesis microbial film; the three-dimensional carrier is partially immersed in sewage and partially exposed in the air. Electrons inside the biological rotating disk can be freely transmitted and can be used for synergistically removing electron donors and electron acceptors in water, the electron donors are prepared from organic matter and ammonia-N, and the electron acceptors are prepared from nitrate nitrogen, nitrous acid nitrogen, sulfate radicaland 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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