Novel ultrasonic wave and catalytic oxidation combined wastewater treatment integrated device

Abstract

The utility model relates to a novel ultrasonic and catalytic oxidation combined wastewater treatment integrated device which comprises an ultrasonic treatment unit and a catalytic oxidation unit, the catalytic oxidation unit is arranged above the ultrasonic treatment unit, and the ultrasonic treatment unit comprises an ultrasonic treatment shell and an ultrasonic vibration head. The lower part of the ultrasonic treatment shell is provided with a water inlet, the ultrasonic vibration head is arranged on the ultrasonic treatment shell, the catalytic oxidation unit comprises a catalytic oxidation shell, the upper part of the catalytic oxidation shell is provided with a water outlet, the bottom in the catalytic oxidation shell is filled with a catalyst, and the ultrasonic treatment shell is communicated with the catalytic oxidation shell. The equipment disclosed by the utility model is high in integration level, does not need biochemical treatment, and is high in process treatment efficiency and simple to operate.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a novel integrated wastewater treatment device that combines ultrasonic waves and catalytic oxidation. Background Technology

[0002] With the rapid development of my country's chemical industry and the increasing number of chemical enterprises, chemical production consumes a lot of water and generates more and more wastewater of various types, which poses a great threat to the environment.

[0003] Wastewater is characterized by large fluctuations in water quality, high pollutant concentrations, complex composition, and strong toxicity. Current wastewater treatment methods include micro-electrolysis, catalytic oxidation, and Fenton treatment, but a single method is rarely sufficient to meet treatment standards.

[0004] To enhance treatment effectiveness, multiple methods are often used in combination. When multiple methods are used in combination, they either heavily rely on biochemical treatment or require catalytic oxidation to achieve a strong effect. Therefore, current technology lacks a practically effective physicochemical combination method. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model provides a novel integrated wastewater treatment device that combines ultrasonic and catalytic oxidation. The device has a high degree of integration, does not require biochemical treatment, and offers high process efficiency and simple operation.

[0006] The technical solution of this utility model is as follows: This utility model is a novel integrated wastewater treatment device combining ultrasound and catalytic oxidation. Its special feature is that the novel integrated wastewater treatment device combining ultrasound and catalytic oxidation includes an ultrasonic treatment unit and a catalytic oxidation unit. The catalytic oxidation unit is located above the ultrasonic treatment unit. The ultrasonic treatment unit includes an ultrasonic treatment housing and an ultrasonic transducer. An inlet is provided at the lower part of the ultrasonic treatment housing, and the ultrasonic transducer is located on the ultrasonic treatment housing. The catalytic oxidation unit includes a catalytic oxidation housing. An outlet is provided at the upper part of the catalytic oxidation housing. A catalyst is filled in the lower part of the catalytic oxidation housing. The ultrasonic treatment housing and the catalytic oxidation housing are connected.

[0007] Furthermore, there are four ultrasonic transducers, evenly distributed on the ultrasonic processing housing.

[0008] Furthermore, the ultrasonic treatment shell is rectangular, while the catalytic oxidation shell is cylindrical.

[0009] Furthermore, a circular opening is provided on the top of the ultrasonic treatment housing, the catalytic oxidation housing is disposed on the circular opening, and the bottom of the catalytic oxidation housing is an opening.

[0010] Furthermore, a support sieve plate is provided inside the catalytic oxidation shell, and the catalyst is placed on the support sieve plate.

[0011] Furthermore, the catalyst is preferably a supported rare earth metal salt catalyst, the support is preferably one of sepiolite, alumina or silica, and the rare earth metal salt is preferably at least one of lanthanum nitrate, cerium nitrate, gadolinium nitrate or scandium nitrate.

[0012] Furthermore, the ultrasonic treatment housing and the catalytic oxidation housing are made of stainless steel.

[0013] Furthermore, the frequency of the ultrasonic transducer is 100–500 kHz.

[0014] This invention provides a novel integrated wastewater treatment device combining ultrasonic treatment and catalytic oxidation. The treatment takes place within an integrated unit comprising a bottom ultrasonic treatment unit and an upper catalytic oxidation unit. Wastewater first enters the bottom ultrasonic treatment unit, where large organic molecules are broken down into smaller ones. The ultrasonically treated wastewater then enters the upper catalytic oxidation unit, where short-chain organic compounds are completely oxidized and decomposed under the action of a catalyst. Therefore, compared with existing technologies, this invention has the following advantages:

[0015] 1) This invention does not involve long-cycle biochemical treatment; it achieves excellent treatment results solely through a combination of physicochemical methods. This invention cleverly utilizes ultrasonic treatment; improvements to the ultrasonic device better lay the foundation for subsequent catalytic oxidation. The optimized process combination of this invention demonstrates strong comprehensive technological value; the integrated application of these two specific methods enables highly efficient wastewater treatment.

[0016] 2) The specific sequence of processes in this utility model not only embodies high comprehensive value, but also matches corresponding integrated equipment, significantly reducing land occupation, increasing efficiency, simplifying operation, saving manpower, and lowering processing costs. Using the method of this utility model, whether treating primary wastewater or effluent from advanced wastewater treatment plants, excellent treatment results can be achieved, meeting or even exceeding industrial wastewater discharge standards. Furthermore, the method of this utility model exhibits good stability and operability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] The annotations in the attached figures are explained as follows:

[0019] 1. Ultrasonic treatment shell; 2. Catalytic oxidation shell; 3. Ultrasonic transducer; 4. Catalyst; 5. Inlet; 6. Outlet; 7. Supporting screen plate. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] See Figure 1 The specific embodiment of this utility model adopts an integrated device structure, with an ultrasonic treatment unit at the bottom and a catalytic oxidation unit at the top. The ultrasonic treatment unit includes an ultrasonic treatment housing 1 and ultrasonic transducers 3. An inlet 5 is provided at the bottom of the ultrasonic treatment housing 1, and four ultrasonic transducers 3 are evenly distributed around the ultrasonic treatment housing 1. The catalytic oxidation unit includes a catalytic oxidation housing 2, with catalyst 4 filled in the lower part and an outlet 6 at the top. The ultrasonic treatment housing 1 and the catalytic oxidation housing 2 are connected. In a preferred embodiment of this utility model, the ultrasonic treatment housing 1 is rectangular, and the catalytic oxidation housing 2 is cylindrical. A circular opening is provided at the top of the ultrasonic treatment housing 1, and the catalytic oxidation housing 2 is positioned on the circular opening, with an opening at the bottom. A supporting sieve plate 7 is also provided inside the catalytic oxidation housing 2, and the catalyst 4 is placed on the supporting sieve plate 7. The supporting sieve plate 7 has multiple sieve holes arranged to allow wastewater to pass through. The sieve hole diameter is smaller than the particle size of the catalyst 4 to prevent the catalyst 4 from falling off the supporting sieve plate 7.

[0022] The ultrasonic treatment unit employs an ultrasonic device with four ultrasonic transducers evenly distributed around its perimeter. Compared to conventional ultrasonic devices with a single transducer in the center, this invention features four evenly dispersed ultrasonic transducers. When wastewater enters the ultrasonic treatment unit, the ultrasonic cavitation effect is significantly enhanced under the specific structure of this invention, achieving the goal of degrading organic matter. Each cavitation bubble can be considered a miniature reactor; the significantly increased ultrasonic cavitation effect is equivalent to more miniature reactors working simultaneously. At the moment the cavitation bubbles collapse, extremely unique physical conditions such as localized high temperature and high pressure are generated, releasing ·OH free radicals. Simultaneously, the central space is more ample, which is more conducive to the reaction. The preferred ultrasonic frequency is 100–500 kHz.

[0023] The ultrasonic treatment unit can significantly enhance thermal decomposition and ·OH radical oxidation, thereby promoting the degradation of organic matter in wastewater. More specifically, because the ultrasonic device with the specific structure of this invention can significantly enhance ultrasonic cavitation, that is, generate significantly more cavitation bubbles, thermal decomposition occurs within the cavitation bubbles, which can vaporize liquid molecules or water-soluble organic matter entering the cavitation bubbles. The energy accumulated within the cavitation bubbles is sufficient to break difficult-to-break chemical bonds. At the same time, highly reactive H· and ·OH radicals are generated within the cavitation bubbles. These radicals enter the aqueous solution, contact with the organic matter in the water, and oxidize the organic matter. Furthermore, because of the specific structure of the ultrasonic device, while enhancing ultrasonic cavitation, it also provides more space for the oxidation reaction, thereby significantly enhancing both the thermal decomposition within the cavitation bubbles and the free radical oxidation reaction outside the cavitation bubbles.

[0024] Furthermore, plasma chemistry and advanced oxidation reactions occur on the inner surface of the cavitation bubble. When the temperature and pressure exceed the critical conditions (647 K, 22.1 MPa), the supercritical fluid exhibits good gas-like fluidity while having a density much greater than that of a gas, thus possessing many unique physicochemical properties. Under critical conditions, the organic matter contained in wastewater is decomposed into water, carbon dioxide, short-chain small molecules, etc.

[0025] In the catalytic oxidation unit, under the action of a supported rare earth metal salt catalyst, the ·OH free radicals generated by the ultrasonic treatment unit continue to react with the organic matter in the wastewater to achieve the purpose of completely removing the organic matter. This can effectively solve the problem of incomplete degradation of organic matter. Moreover, the catalyst exists in a solid state, which is easy to separate from water and results in less secondary pollution.

[0026] Catalyst 4 is preferably a supported rare earth metal salt catalyst. The support is preferably one of sepiolite, alumina, or silica. The rare earth metal salt is preferably at least one of lanthanum nitrate, cerium nitrate, gadolinium nitrate, and scandium nitrate, more preferably two of lanthanum nitrate, cerium nitrate, gadolinium nitrate, and scandium nitrate. The loading of rare earth metal is preferably 10-30 wt%. The supported rare earth metal salt catalyst not only exhibits good catalytic effect in the process of this invention, but is also easy to fill and reuse multiple times. It also facilitates the recovery and regeneration of deactivated catalyst, which is beneficial to practical operation and cost savings.

[0027] The specific processing method of this utility model is as follows:

[0028] Wastewater first enters through the inlet 5 at the bottom of the ultrasonic treatment shell 1. The ultrasonic transducer 3 decomposes large organic molecules into small organic molecules. Then, the wastewater enters the upper catalytic oxidation shell 2, which is filled with a supported rare earth metal salt catalyst. The short-chain organic molecules in the wastewater are completely decomposed by oxidation under the action of the catalyst, and the decomposed water is discharged from the outlet 6.

[0029] The following two specific embodiments further illustrate the processing effect of this utility model.

[0030] Example 1

[0031] A pharmaceutical intermediate wastewater, with a COD of 5600 mg / L and an ammonia nitrogen of 145 mg / L, was treated using the integrated wastewater treatment device combining ultrasonic waves and catalytic oxidation as described in this invention. The ultrasonic frequency was 400 kHz, and the catalyst in the catalytic oxidation unit was a supported rare earth metal salt catalyst (alumina as the support, with 10 wt% each of cerium nitrate and gadolinium nitrate). The wastewater treatment effect is shown in the table below:

[0032] Serial Number index unit Influent water quality effluent water quality Removal rate 1 <![CDATA[COD cr ]]> mg / L 5600 425 92.4％ 2 ammonia nitrogen mg / L 145 32 77.9％

[0033] Example 2

[0034] A company's wastewater treatment plant effluent underwent advanced treatment using the integrated wastewater treatment device combining ultrasonic waves and catalytic oxidation, as described in this invention. The ultrasonic frequency was 400 kHz, and the catalyst in the catalytic oxidation unit was a supported rare earth metal salt catalyst (alumina as the support, with 10 wt% each of cerium nitrate and gadolinium nitrate). The treatment results are as follows:

[0035] Serial Number index unit Influent water quality effluent water quality Removal rate 1 <![CDATA[COD cr ]]> mg / L 322 46 85.7％ 2 ammonia nitrogen mg / L 73 6.3 91.4％

[0036] The content of this utility model and the technical content not specifically described in the above embodiments are the same as the prior art.

[0037] The above are merely specific embodiments disclosed in this utility model, but the scope of protection disclosed in this utility model is not limited thereto. The scope of protection disclosed in this utility model shall be determined by the scope of protection of the claims.

Claims

1. A novel integrated wastewater treatment device combining ultrasonic waves and catalytic oxidation, characterized in that: The novel integrated wastewater treatment device combining ultrasound and catalytic oxidation includes an ultrasonic treatment unit and a catalytic oxidation unit. The catalytic oxidation unit is positioned above the ultrasonic treatment unit. The ultrasonic treatment unit includes an ultrasonic treatment housing and an ultrasonic transducer. An inlet is provided at the lower part of the ultrasonic treatment housing, and the ultrasonic transducer is mounted on the ultrasonic treatment housing. The catalytic oxidation unit includes a catalytic oxidation housing, with an outlet at the upper part. The lower part of the catalytic oxidation housing is filled with a catalyst, and the ultrasonic treatment housing is connected to the catalytic oxidation housing.

2. The novel integrated wastewater treatment device combining ultrasonic and catalytic oxidation according to claim 1, characterized in that: There are four ultrasonic transducers, which are evenly distributed on the ultrasonic processing housing.

3. The novel integrated wastewater treatment device combining ultrasonic and catalytic oxidation according to claim 2, characterized in that: The ultrasonic treatment housing is rectangular, and the catalytic oxidation housing is cylindrical.

4. The novel integrated wastewater treatment device combining ultrasonic and catalytic oxidation according to claim 3, characterized in that: The ultrasonic treatment housing has a circular opening at the top, the catalytic oxidation housing is disposed on the circular opening, and the bottom of the catalytic oxidation housing is an opening.

5. The novel integrated wastewater treatment device combining ultrasonic and catalytic oxidation according to claim 4, characterized in that: The catalytic oxidation shell is provided with a support sieve plate, and the catalyst is placed on the support sieve plate.

6. The novel integrated wastewater treatment device combining ultrasonic and catalytic oxidation according to any one of claims 1 to 5, characterized in that: The catalyst is a supported rare earth metal salt catalyst, and the support is sepiolite, alumina or silica.

7. The novel integrated wastewater treatment device combining ultrasonic and catalytic oxidation according to claim 6, characterized in that: The ultrasonic treatment housing and the catalytic oxidation housing are made of stainless steel.

8. The novel integrated wastewater treatment device combining ultrasonic and catalytic oxidation according to claim 7, characterized in that: The frequency of the ultrasonic transducer is 100–500 kHz.

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