Method of preparing methanol by sewage treatment and carbon dioxide reduction

Abstract

The invention provides a method of preparing methanol by sewage treatment and carbon dioxide reduction by means of a microbial electrolytic tank. The method comprises the following steps: after removing oxygen in organic sewage, injecting the organic sewage into the microbial electrolytic tank as a nutritional source for growing anode electrogenesis microorganisms which disassimilate organic matters in sewage to generate CO2, H+ and electrons; under the effect of an electronic assistant and cathode biocatalyst, reducing the generated H+ and electrons as well as CO2 on the surface of the cathode to methanol. The method provided by the invention is free from expensive catalysts, low in cost and low in energy consumption, and the speed of treating the organic sewage and generating methanol by reducing carbon dioxide is relatively high, so that the problems that conventional organic sewage bio-treatment is high in energy consumption and conventional electrocatalytic reduction of carbon dioxide to prepare methanol is high in energy consumption and low in efficiency of a cathode catalyst are solved, thereby providing a novel path to resourceful utilization of the organic sewage and carbon dioxide. The method is of important meanings to energy conservation and emission reduction and environmental management.

Description

[0001] technical field [0002] The invention belongs to the technical field of organic wastewater treatment and carbon dioxide resource utilization, and in particular relates to a method for realizing sewage treatment and carbon dioxide reduction to methanol by using a microbial electrolytic cell. [0003] Background technique [0004] Energy, environment and water resources are the basis for human survival. In recent years, the rapid growth of the use of fossil fuels, especially oil and natural gas, has triggered a global energy crisis. In addition, large amounts of CO emitted during the use of fossil fuels 2 It will cause the greenhouse effect and cause climate warming. How to convert excess carbon dioxide that does not participate in the carbon cycle into fuels and chemical products, which can not only solve environmental problems but also achieve sustainable development, has become a problem that scientists around the world are trying to explore. Carbon dioxide is c...

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Problems solved by technology

Carbon dioxide is converted into formic acid, methane, ethanol, formaldehyde and other organic compounds through electrochemical hydrogenation reduction reaction (application number CN200810058543.3), and formic acid is prepared by electrochemical catalytic reduction of carbon dioxide (application number CN201110078394.9), methanol (application number CN201010266161.7 ) and other methods can carry out resource utilization of carbon dioxide, but there are disadvantages such as high processing cost, need for noble metal catalysts, high energy consumption, and poor environmental friendliness

However, the activated sludge process consumes a lot of energy to treat sewage. At the same time, the activated sludge process also produces a large amount of sludge, and the treatment of the sludge also requires high costs.

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