Heterogeneous ozone catalytic oxidation and membrane separation integrated reactor

Abstract

The present invention relates to a heterogeneous ozone catalytic oxidation and membrane separation integrated reactor, comprising a primary membrane reaction box, the internal cavity of which is divided from bottom to top into a first lower water collection area for mixing wastewater, ozone and reagents and a first upper water collection area for collecting treated wastewater; and a catalyst layer and a tubular microfiltration membrane are arranged between the two water collection areas, wherein the tubular microfiltration membrane is located below the catalyst layer, and one end of the tubular microfiltration membrane is connected to the first lower water collection area. The above-mentioned heterogeneous ozone catalytic oxidation and membrane separation integrated reactor can effectively remove a large amount of suspended particulate matter in raw water by using a tubular microfiltration membrane, ensure that the inlet water quality meets the requirements of heterogeneous ozone catalytic oxidation and separate concentrated waste liquid, and the composite membrane assembly re-concentrates the concentrated liquid from the tubular microfiltration membrane, realizing the combination of high-efficiency separation and pollutant elimination functions, and improving wastewater treatment efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a heterogeneous ozone catalytic oxidation and membrane separation integrated reactor. Background Art

[0002] With the vigorous development of my country's social economy and the continuous development of industrial level, people's environmental awareness has gradually awakened, and environmental pollution has begun to attract attention. Among them, the treatment of domestic sewage and industrial wastewater needs to be solved urgently. The large amount of organic pollutants contained in them is the difficulty and focus of treatment. If they are not treated or treated incompletely, they will cause damage to water bodies and the environment, leading to the continuous deterioration of the ecological environment and ultimately endangering human beings themselves.

[0003] Advanced oxidation technology is regarded as an effective way to treat organic wastewater, and ozone catalytic oxidation as one of them has also received extensive attention and research. The current ozone catalytic oxidation technology can be roughly divided into two categories: homogeneous and heterogeneous ozone catalysis. Compared with heterogeneous catalysis, both have more advantages. Not only is the decomposition rate of ozone faster and the reaction more efficient, but the catalyst is easy to recycle and does not produce secondary pollution. However, heterogeneous ozone catalysis still has problems such as high catalyst cost, easy dissolution of active substances, catalyst poisoning, and shortened life.

[0004] Heterogeneous ozone catalytic oxidation has very high requirements on the quality of the influent water. The suspended particulate matter (SS) must be maintained at a certain level. If the SS concentration in the influent water is too high, SS will be adsorbed on the catalyst surface during the reaction, causing catalyst poisoning and affecting the performance and life of the catalyst. It is particularly important to pretreat the influent water to remove SS. However, traditional solid-liquid separation methods have problems such as low efficiency, inability to operate for a long time, and high cost. Summary of the invention

[0005] Based on this, it is necessary to provide an integrated reactor of heterogeneous ozone catalytic oxidation and membrane separation to address the problem of low efficiency of traditional solid-liquid separation methods.

[0006] A heterogeneous ozone catalytic oxidation and membrane separation integrated reactor, comprising:

[0007] A primary membrane reaction box, wherein the internal cavity is divided from bottom to top into a first lower water collection area for mixing wastewater, ozone and reagents and a first upper water collection area for collecting treated wastewater; and a catalyst layer and a tubular microfiltration membrane are arranged between the two water collection areas, wherein the tubular microfiltration membrane is located below the catalyst layer, and one end of the tubular microfiltration membrane is connected to the first lower water collection area; and

[0008] A secondary membrane reaction box is provided with a composite membrane assembly inside, the other end of the tubular microfiltration membrane is connected to the cavity below the composite membrane assembly, a water production pipe is installed inside the composite membrane assembly, and the water outlet end of the water production pipe is connected to the first lower water collection area.

[0009] Furthermore, the first lower water collection area and the first upper water collection area are connected through a return pipeline.

[0010] Furthermore, the reflux pipeline includes a pipeline connecting the first lower water collection area and the first upper water collection area and a circulation pump arranged on the pipeline, which is used to drive the liquid in the first upper water collection area to flow to the first lower water collection area.

[0011] Furthermore, the internal cavity of the secondary membrane reaction box is divided into a second lower water collection area and a second upper water collection area from bottom to top; one end of the tubular microfiltration membrane is connected to the second lower water collection area, and the composite membrane assembly is installed between the second lower water collection area and the second upper water collection area.

[0012] Furthermore, an overflow collection area is provided on the side of the second upper water collection area, and the second upper water collection area is connected with the overflow collection area through an overflow port.

[0013] Furthermore, a sewage outlet is provided at the lower end of the overflow collection area for discharging the scum in the overflow collection area.

[0014] Furthermore, vents are provided at the tops of the first upper water collection area and the second upper water collection area to maintain pressure balance inside and outside the membrane reactor box.

[0015] Furthermore, flushing ports are provided at the tops of the first upper water collection area and the second upper water collection area for providing compressed air and cleaning water to flush the inside of the box.

[0016] The above-mentioned heterogeneous ozone catalytic oxidation and membrane separation integrated reactor can effectively remove a large amount of suspended particulate matter in the raw water by using a tubular microfiltration membrane, ensuring that the inlet water quality meets the requirements of heterogeneous ozone catalytic oxidation and separating the concentrated waste liquid. The composite membrane component re-concentrates the concentrated liquid from the tubular microfiltration membrane, realizing the combination of high-efficiency separation and pollutant elimination functions, and improving the wastewater treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a primary membrane reaction box;

[0018] Figure 2 It is a schematic diagram of the structure of the two-stage membrane reaction box.

[0019] In the figure: 100, primary membrane reaction box; 110, first lower water collection area; 120, first upper water collection area; 130, tubular microfiltration membrane; 140, catalyst layer; 150, reflux pipeline; 200, secondary membrane reaction box; 210, second lower water collection area; 220, composite membrane assembly; 230, water production pipe; 240, second upper water collection area; 250, overflow collection area. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1 and Figure 2 As shown, in one embodiment, a heterogeneous ozone catalytic oxidation and membrane separation integrated reactor comprises: a primary membrane reaction box 100, the internal cavity of which is divided from bottom to top into a first lower water collection area 110 for mixing wastewater, ozone and reagents and a first upper water collection area 120 for collecting treated wastewater; the first lower water collection area 110 and the first upper water collection area 120 are connected through a reflux pipeline 150; and a catalyst layer 140 and a tubular microfiltration membrane 130 are arranged between the two water collection areas, wherein the tubular microfiltration membrane 130 is located below the catalyst layer 140, and one end of the tubular microfiltration membrane 130 is connected to the first lower water collection area 110. A secondary membrane reaction box 200, a composite membrane assembly 220 is installed inside, the other end of the tubular microfiltration membrane 130 is connected to the cavity below the composite membrane assembly 220, a water production pipe 230 is installed in the composite membrane assembly 220, and the water outlet end of the water production pipe 230 is connected to the first lower water collection area 110.

[0022] When in use, raw water enters the first lower water collection area 110, and after being mixed with chemicals and ozone, it enters the tubular microfiltration membrane 130 for filtration. The clear wastewater filtered by the tubular microfiltration membrane 130 enters the catalyst layer 140 and is finally collected in the first upper water collection area 120. The reflux pipeline 150 can transport the clear wastewater in the first upper water collection area 120 to the first lower water collection area 110; the wastewater concentrate that is not filtered by the tubular microfiltration membrane 130 will flow into the cavity below the composite membrane assembly 220 in the secondary membrane reaction box 200, and the wastewater concentrate flows upward through the composite membrane assembly 220. The wastewater concentrate filtered by the composite membrane assembly 220 flows back to the first lower water collection area 110 through the water production pipe 230.

[0023] The above-mentioned heterogeneous ozone catalytic oxidation and membrane separation integrated reactor can effectively remove a large amount of suspended particulate matter in the raw water by using the tubular microfiltration membrane 130, thereby ensuring that the inlet water quality meets the requirements of heterogeneous ozone catalytic oxidation and separating the concentrated waste liquid. The composite membrane assembly 220 further concentrates the concentrated liquid from the tubular microfiltration membrane 130, thereby realizing the combination of high-efficiency separation and pollutant elimination functions and improving the wastewater treatment efficiency.

[0024] In this embodiment, the first lower water collection area 110 and the first upper water collection area 120 are connected through a reflux pipeline 150. By using the reflux pipeline 150 to reflux the liquid in the first upper water collection area 120 to the first lower water collection area 110, the reaction time of the wastewater is prolonged. The specific reflux pipeline 150 includes a pipeline connecting the first lower water collection area 110 and the first upper water collection area 120 and a circulation pump arranged on the pipeline, which is used to drive the liquid in the first upper water collection area 120 to flow to the first lower water collection area 110.

[0025] In this embodiment, the internal cavity of the secondary membrane reactor box 200 is divided into a second lower water collection area 210 and a second upper water collection area 240 from bottom to top; one end of the tubular microfiltration membrane 130 is connected to the second lower water collection area 210, and the composite membrane assembly 220 is installed between the second lower water collection area 210 and the second upper water collection area 240.

[0026] In this embodiment, an overflow collection area 250 is provided on the side of the second upper water collection area 240, and the second upper water collection area 240 is connected to the overflow collection area 250 through an overflow port. The concentrated liquid passing through the composite membrane module 220 will enter the second upper water collection area 240, and when the liquid level is higher than the overflow port, the liquid above the overflow port and the foam on the surface will overflow into the overflow collection area 250, wherein the liquid will return to the second upper water collection area 240 through the overflow collection area 250.

[0027] In this embodiment, a drain port is provided at the lower end of the overflow collection area 250 for discharging the scum in the overflow collection area 250. The scum flowing into the overflow collection area 250 will be gathered in the overflow collection area 250 and can be discharged through the drain port.

[0028] In this embodiment, vents are provided at the tops of the first upper water collection area 120 and the second upper water collection area 240 to maintain pressure balance inside and outside the membrane reactor.

[0029] In this embodiment, flushing ports are provided at the tops of the first upper water collection area 120 and the second upper water collection area 240 to provide compressed air and cleaning water for regular flushing of the box. The above-mentioned primary membrane reaction box 100 is at normal pressure during normal operation. When the tubular microfiltration membrane 130 needs backwashing, the pressure inside the container can rise to 0.5-0.7 MPa. The water with strong oxidizing properties in the primary membrane reaction box 100 is used as flushing water to clean the pollutants on the membrane surface, simplifying the design of the membrane backwashing system; because the tubular microfiltration membrane 130 is in a strong oxidizing environment, organic pollutants are not easy to adhere to the membrane surface, which can increase the membrane flux and reduce the membrane backwashing frequency.

[0030] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A heterogeneous ozone catalytic oxidation and membrane separation integrated reactor, characterized in that: include: The first-stage membrane reaction box has an internal cavity which is divided from bottom to top into a first lower water collection area for mixing wastewater, ozone and reagents and a first upper water collection area for collecting treated wastewater; and a catalyst layer and a tubular microfiltration membrane are arranged between the two water collection areas, wherein the tubular microfiltration membrane is located below the catalyst layer, and one end of the tubular microfiltration membrane is connected to the first lower water collection area; and The secondary membrane reaction box has an internal cavity which is divided into a second lower water collection area, a composite membrane assembly and a second upper water collection area from bottom to top; the other end of the tubular microfiltration membrane is connected to the second lower water collection area below the composite membrane assembly, a water production pipe is installed in the composite membrane assembly, and the water outlet end of the water production pipe is connected to the first lower water collection area; an overflow collection area is arranged on the side of the second upper water collection area, and the second upper water collection area is connected to the overflow collection area through an overflow port; Vents are provided at the top of the first upper water collection area and the second upper water collection area to maintain the pressure balance inside and outside the membrane reaction box; flushing ports are provided at the top of the first upper water collection area and the second upper water collection area to provide compressed air and cleaning water for flushing the box.

2. The heterogeneous ozone catalytic oxidation and membrane separation integrated reactor according to claim 1, characterized in that: The first lower water collection area and the first upper water collection area are communicated with each other through a return pipeline.

3. The heterogeneous ozone catalytic oxidation and membrane separation integrated reactor according to claim 2, characterized in that: The reflux pipeline includes a pipeline connecting the first lower water collection area and the first upper water collection area and a circulation pump arranged on the pipeline, which is used to drive the liquid in the first upper water collection area to flow to the first lower water collection area.

4. The heterogeneous ozone catalytic oxidation and membrane separation integrated reactor according to claim 1, characterized in that: A sewage outlet is arranged at the lower end of the overflow collection area for discharging the scum in the overflow collection area.

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