Fenton-like oxidation device for waste resin and oxidation method of device

Abstract

The invention provides a Fenton-like oxidation method for waste resin. The method comprises the following steps: 1) mixing the radioactive waste resin having water generated in nuclear industry and acomposite catalyst, adding a certain amount of Na2SO4, and performing full stirring; and 2) controlling the reaction temperature and pH, introducing oxygen or performing aeration, adding H2O2 with a certain concentration by mass through valve control, and performing rapid degradation on the waste resin under the energization condition to make the organic components of the waste resin inorganic, wherein the catalyst is a mixture of Fe<2+> and Mn<2+> or Co<2+>. By using the oxidation method and device provided by the invention, the oxidative degradation efficiency of the waste resin can be improved in a shorter reaction time, the use amount of H2O2 during the treatment can be reduced, and the generation rate of an oxidant during the treatment can be improved; and the method has the advantages of a simple process, high efficiency and low production costs.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant waste treatment and devices thereof, in particular to a waste resin Fenton oxidation device and an oxidation method thereof. Background technique [0002] One use of ion exchange resins (IERs) is the removal of radioactive contaminants (neutron activation and fission products leaked from fuel elements) from the purge water of nuclear facilities. As important low-level radioactive waste (LLW), used IERs are used to absorb 90 Sr, 137 Cs, 235 U, 238 U and other elements. Technologies used to treat and dispose of radioactive waste resins include immobilization (e.g. cementation, asphalt and plastic curing), advanced oxidation processes (e.g. incineration, pyrolysis, acid digestion, Fenton or Fenton-like reactions, supercritical water), plasma techniques and super compact. There are also some other methods such as pickling, microbial conversion treatment and high integrity container m...

AI Technical Summary

Problems solved by technology

The method waste resin and catalyst Fe 2+ with Mn 2+ or Co 2+ The mixed solution is stirred in the reaction vessel at the same time, the pH of the solution is adjusted, oxygen or aeration is introduced, and the reaction is carried out under the condition of electrification, and H is added dropwise to the reactor according to the reaction rate of the reaction system. 2 o 2 solution, waste resin is oxidatively degraded, the operating conditions are mild, and the waste resin does not need to be pretreated before the reaction, the waste resin is completely decomposed without secondary pollution, and the decomposition residue is filtered through the nanofiltration membrane, which is economically feasible and the nuclides contained in the resin It is almost completely enriched in the decomposition residue and residue and does not contain any radioactive nuclides in the gas phase. The whole reaction system has a good treatment effect on waste resin, high reactivity, high oxidation efficiency, mild reaction conditions, low catalyst price, and oxidant Environmentally friendly, low reaction temperature, high safety, good application prospects, solve the problem of secondary pollutants treatment to a certain extent, in order to achieve this purpose, the present invention provides a waste resin Fenton oxidation device, including Reactor shell, cathode plate, anode plate, aeration device, constant current power supply device, stirring device, reaction rate test device, filtration module, temperature indicator and controller, water outlet 1 and water outlet 2, water body detection port 1 and water body detection port 2, waste material export, waste resin import, pH adjustment port, catalyst addition port and H 2 o 2 Inlet, the cathode plate and the anode plate are alternately discharged in the reactor shell, and the reaction compartment is formed between the adjacent cathode plate and the anode plate, and the cathode plate and the anode plate are connected to the constant current power supply device through the connection line, The reactor shell is connected to a temperature indicator and a controller through a connection line, and there is a row of stirring devices at the bottom of the reactor shell, and the stirring device is magnetic stirring, and the top of the reactor shell has a pH adjustment port, Catalyst addition port and H 2 o 2 import, the H 2 o 2 Import to H 2 o 2 Inlet and reaction rate test feedback system, one end of the reaction rate test device extends into the reactor shell, the aeration part of the aeration device extends below the cathode plate and the anode plate in the reactor shell, and the reactor shell There is a waste resin inlet on one side of the bottom of the reactor shell. There are two filter compartments on one side of the reaction compartment of the reactor shell. The two filter chambers respectively have a water body detection port 1 and a water body detection port 2. The water body detection port 1 There is a filter module between the water body detection port 2, there is a water outlet 1 below the water body detection port 1, there is a water outlet 2 below the water body detection port 2, and there is a residue outlet at the bottom of the reactor shell

Images