Sequencing batch type electro-fenton device used for acrylonitrile wastewater advanced treatment and method thereof

Abstract

The invention relates to a sequencing batch type electro-fenton device used for acrylonitrile wastewater advanced treatment. The electro-fenton device comprises an electrolytic cell, wherein a stirrer, an anode and a cathode are arranged in the electrolytic cell; the anode and the cathode are respectively connected with a positive electrode and a negative electrode of a direct-current stabilized power supply. The electro-fenton further comprises an acid liquor storage slot, an alkali liquor storage slot, a H2O2 storage slot and a wastewater storage slot, wherein the acid liquor storage slot is connected with the electrolytic cell and used for adding the acid liquor; the alkali liquor storage slot is used for adding the alkali liquor; and the H2O2 storage slot is used for adding H2O2 liquor and the wastewater storage slot is used for adding acrylonitrile wastewater. The electro-fenton device further comprises a pH probe and a pH controller, wherein the pH probe is arranged in the electrolytic cell; the pH controller is connected with the pH probe; the pH controller is used for controlling a first liquid inlet pump and a second liquid inlet pump to regulate pH value in the electrolytic cell; and a water outlet tube and a solenoid valve are connected to control water discharging from the electrolytic cell. The invention further provides a corresponding acrylonitrile wastewater advanced treatment method. According to the invention, by externally applying current, pH is regulated to realize recycling Fe<2+>, so that reaction efficiency is improved and operation cost is lowered.

Description

Technical field [0001] The present invention relates to the technical field of environmental engineering, and more specifically to a sequencing batch electric Fenton device and method for advanced treatment of acrylonitrile wastewater. Background technique [0002] Acrylonitrile wastewater is a kind of refractory organic wastewater in the petrochemical industry. It contains many toxic and harmful substances such as acrylonitrile, acetonitrile, ammonium sulfate, hydrocyanic acid, etc., and its biodegradability is poor. Using traditional biochemical processes, such as activated sludge method, it is difficult to completely remove these poisons. The biochemical effluent still contains a certain amount of nitrile compounds and ammonia nitrogen, which are harmful to the environment and health. Therefore, it is necessary to carry out advanced treatment of wastewater. [0003] The Fenton method is a new type of electrochemical advanced oxidation technology developed on the basis of the Fe...

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Problems solved by technology

[0004] The electro-Fenton devices in the prior art mostly use various electrodes to generate H 2 o 2 and Fe 2+ , less attention is paid to the operation control of the device, the pertinence of the treated wastewater is not strong, and the catalyst Fe is not considered 2+ recovery and reuse, there may be a large amount of iron sludge or the reaction of Fe in water 3+ high content

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