Method for oxidative degradation of organic wastewater through low-grade thermal energy

Abstract

The invention discloses a method for oxidative degradation of organic wastewater through low-grade thermal energy and belongs to the field of advanced oxidative degradation of organic wastewater. Themethod comprises converting low-grade thermal energy into chemical potential energy of a working solution through a separator, and converting chemical potential energy of the solution into organic wastewater oxidative degradation energy through the oxidizing reaction at an anode and the reducing reaction at a cathode in a reverse electrodialysis RED cell stack and outputting the electric energy, wherein after the solution chemical potential energy is converted into the organic wastewater oxidative degradation energy and electrical energy, the concentration of the concentrated solution is decreased and the concentration of the diluted solution is increased, the two solutions flowing out of the RED cell stack and are mixed into a solution with an intermediate concentration, and the solutionwith an intermediate concentration is preheated and heated, then enters a separator and then is heated and separated through low-grade heat so that one cycle is finished. The low-grade heat can be fully, continuously and stepwisely used. The system is simple and reliable, has flexible volume configuration, is safe in operation and can effectively degrade various high-concentration organic wastewater that are difficult to biochemically degrade.

Description

technical field [0001] The invention belongs to the field of advanced oxidative degradation of organic wastewater, and relates to a novel organic wastewater oxidative degradation method driven by low-grade heat energy. Background technique [0002] The existing organic wastewater treatment methods include biochemical degradation and advanced oxidative degradation. Biochemical degradation methods, including anaerobic and aerobic methods, rely on the coordination and cooperation of various microorganisms and their own metabolic processes to decompose organic matter into environmentally harmless substances in an anaerobic or aerobic environment. This method has been widely used to treat low-concentration organic wastewater and achieved good results. However, it is difficult to effectively treat the organic wastewater discharged from production processes including pharmaceuticals, pesticides, printing and dyeing, refining, coking, etc. by using biochemical degradation methods. ...

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Problems solved by technology

However, these organic wastewater treatment methods need to consume a lot of electricity or chemical reagents, resulting in higher organic wastewater treatment costs

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