Device for removing volatile organic compounds in water

Abstract

The utility model discloses a device for removing volatile organic compounds in water, which can remove the volatile organic compounds in the water to below 1ppm and is lower in operation energy consumption. The device comprises a wastewater circulation pipeline; a nitrogen purging pipeline; an organic matter gathering pipeline; the treated wastewater flows out of the pipeline; and at least one group of volatile organic compound removal membrane contactors, each group of volatile organic compound removal membrane contactors comprising a contactor body, a wastewater inlet, a wastewater outlet, a purge gas inlet and a volatile organic compound outlet, waste water inlets and waste water outlets of all volatile organic compound removal membrane contactors are sequentially connected in series to form a total waste water inlet and a total waste water outlet corresponding to the waste water circulation pipeline; an inlet of the wastewater circulation pipeline is integrated with a lifting pump, and the wastewater circulation pipeline is provided with a water inlet flow meter and a plurality of security filters along the wastewater circulation direction.

Description

Technical Field

[0001] This utility model relates to the technical field of environmental protection equipment, specifically a device for removing volatile organic compounds from water. Background Technology

[0002] Currently, volatile organic compounds in water are generally treated using ozone or ultraviolet disinfection devices. However, these devices consume a lot of energy and are not very effective at removing volatile organic compounds, failing to reduce their concentration to below 50 ppm. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a device for removing volatile organic compounds from water, which can remove volatile organic compounds from water to below 1 ppm, and the device has low operating energy consumption.

[0004] A device for removing volatile organic compounds from water, characterized in that it comprises:

[0005] Wastewater circulation pipelines;

[0006] Nitrogen purging lines;

[0007] Organic matter collection pipeline;

[0008] The treated wastewater flows out of the pipeline;

[0009] And at least one set of volatile organic compound (VOC) removal membrane contactors, each set of VOC removal membrane contactors includes a contactor body, a wastewater inlet, a wastewater outlet, a purge gas inlet, and a VOC outlet. The wastewater inlets and wastewater outlets of all VOC removal membrane contactors are connected in series to form a total wastewater inlet and a total wastewater outlet corresponding to the wastewater flow pipeline.

[0010] The inlet of the wastewater flow pipeline is integrated with a booster pump, and the wastewater flow pipeline is equipped with an inlet flow meter and several security filters along the wastewater flow direction.

[0011] The external wastewater pipeline is connected to the inlet of the booster pump. The outlet of the wastewater flow pipeline is connected to the wastewater inlet of the first volatile organic compound (VOC) removal membrane contactor, i.e., the total wastewater inlet. The wastewater outlet of the last VOC removal membrane contactor, i.e., the total wastewater outlet, is connected to the inlet of the treated wastewater outflow pipeline. Nitrogen purging pipelines are connected in parallel to each of the purging gas inlets. Each VOC outlet is connected in parallel to the inlet of the organic matter collection pipeline. The organic matter collection pipeline integrates a liquid ring vacuum pump. The outlet of the organic matter collection pipeline is connected to an external tail gas treatment device.

[0012] Its further features are:

[0013] The number of volatile organic compound (VOC) removal membrane contactors is two sets, which are arranged vertically in parallel. The wastewater inlet of the VOC removal membrane contactor is located at the bottom and the wastewater outlet is located at the top. The two sets of VOC removal membrane contactors are the first VOC removal membrane contactor and the second VOC removal membrane contactor. The top wastewater outlet of the first VOC removal membrane contactor is connected to the bottom wastewater inlet of the second VOC removal membrane contactor through a bent connecting pipe to form a series mechanism.

[0014] The nitrogen purging pipeline is equipped with a nitrogen inlet pressure gauge and a nitrogen inlet flow meter. The pressure of the nitrogen inlet pressure gauge is controlled to be less than 0.1 MPa by adjusting the valve, and the flow rate of the nitrogen inlet is controlled by the nitrogen inlet flow meter to ensure that the gas-water ratio is greater than 3:1.

[0015] The wastewater flow pipeline is connected to an inlet TOC detector, and the treated wastewater outflow pipeline is also connected to an outlet TOC detector. The inlet TOC detector 10 detects the organic matter content of the inlet water, and the outlet TOC detector 11 detects the organic matter content of the treated water. These two instruments are used to monitor the performance of the volatile organic compound removal membrane contactor.

[0016] The wastewater flow pipeline includes a first lifting section, a first horizontal section, a second descending section, and a second horizontal section. A lifting pump is installed at the bottom inlet of the first lifting section, and an inlet flow meter is integrated on the first lifting section. Several security filters are installed on the second descending section, and the outlet of the second horizontal section is connected to the wastewater inlet of the first volatile organic compound removal membrane contactor through a vertical connecting pipe.

[0017] It also includes a control cabinet containing electrical equipment and automatic control programs to ensure that the entire device can operate fully automatically.

[0018] The working principle of the volatile organic compound removal membrane contactor after adopting this utility model is as follows: Figure 2The gas transport membrane material used is a selectively permeable material. The volatile organic compound (VOC) removal membrane contactor contains a large number of hollow fibers with tiny pores on the fiber walls. Only gas molecules can pass through these micropores, allowing gas to permeate bidirectionally while liquids cannot. Gas-liquid contact is established on both sides of the material, and the gas flow from the liquid is carried by the airflow, thus reducing the gas content in the liquid. During operation, wastewater containing VOCs is pressurized to 0.4 MPa by a booster pump, then filtered through a security filter to remove impurities, reducing the turbidity of the wastewater to less than 0.1 NTU before entering the VOC removal process. The volatile organic compound (VOC) membrane contactor uses nitrogen to purge the wastewater. By controlling the flow rate of the purging nitrogen, the gas-to-water ratio must be greater than 3:1. The VOC membrane contactor removes dissolved VOCs from the wastewater. A vacuum pump creates a negative pressure, and due to the negative pressure and nitrogen purging, the dissolved VOCs in the water enter the membrane contactor. They are then carried out by the negative pressure pump and discharged from the outlet of the organic matter collection pipeline, entering the downstream tail gas treatment device for further treatment. The water with VOCs removed flows out from the treated wastewater outlet pipeline. This system can remove VOCs from the water to below 1 ppm, and the operating energy consumption of the device is low. Attached Figure Description

[0019] Figure 1 This is a schematic block diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the volatile organic compound removal membrane contactor used in this utility model;

[0021] The names corresponding to the serial numbers in the diagram are as follows:

[0022] 1. Contactor body; 2. Wastewater inlet; 3. Wastewater outlet; 4. Purge gas inlet; 5. Volatile organic compound outlet;

[0023] Wastewater flow pipe 10, first lifting section 101, first horizontal section 102, second descending section 103, second horizontal section 104, vertical connecting pipe 105, lifting pump 11, inlet flow meter 12, several security filters 13, nitrogen purging pipe 20, nitrogen inlet pressure gauge 21, nitrogen inlet flow meter 22, organic matter collection pipe 30, outlet 31, treated wastewater outflow pipe 40, first volatile organic compound removal membrane contactor 50, second volatile organic compound removal membrane contactor 60, riser pipe 61, bent connecting pipe 70, liquid ring vacuum pump 80, inlet TOC detector 90, outlet TOC detector 100, control cabinet 110. Detailed Implementation

[0024] A device for removing volatile organic compounds from water, see Figure 1 and Figure 2 It includes a wastewater flow pipeline 10, a nitrogen purging pipeline 20, an organic matter collection pipeline 30, a treated wastewater outflow pipeline 40, and two sets of volatile organic compound removal membrane contactors.

[0025] Each group of VOCs removal membrane contactors includes a contactor body 1, a wastewater inlet 2, a wastewater outlet 3, a purge gas inlet 4, and a VOCs outlet 5. The wastewater inlets 2 and wastewater outlets 3 of all the VOCs removal membrane contactors are connected in series to form a total wastewater inlet and a total wastewater outlet corresponding to the wastewater flow pipe 10.

[0026] Two sets of VOCs removal membrane contactors are arranged vertically in parallel. The wastewater inlet of the VOCs removal membrane contactor is located at the bottom and the wastewater outlet is located at the top. The two sets of VOCs removal membrane contactors are the first VOCs removal membrane contactor 50 and the second VOCs removal membrane contactor 60. The top wastewater outlet 3 of the first VOCs removal membrane contactor 50 is connected to the bottom wastewater inlet 2 of the second VOCs removal membrane contactor 60 through a bent connecting pipe 70, forming a series mechanism.

[0027] The inlet of the wastewater flow pipe 10 is integrated with a booster pump 11, and the wastewater flow pipe 10 is equipped with an inlet flow meter 12 and several security filters 13 along the wastewater flow direction.

[0028] The external wastewater pipeline is connected to the inlet of the booster pump 11. The outlet of the wastewater flow pipeline 10 is connected to the wastewater inlet 2 of the first volatile organic compound removal membrane contactor 50, i.e., the total wastewater inlet. The wastewater outlet 3 of the second volatile organic compound removal membrane contactor 60, i.e., the total wastewater outlet, is connected to the inlet of the treated wastewater outflow pipeline 40 through the riser pipe 61. The nitrogen purging pipeline 20 is connected in parallel to each purging gas inlet 4. Each volatile organic compound outlet 2 is connected in parallel to the inlet of the organic matter collection pipeline 30. The organic matter collection pipeline 30 is equipped with a liquid ring vacuum pump 80. The outlet 31 of the organic matter collection pipeline 30 is connected to an external tail gas treatment device.

[0029] In practice, the nitrogen purging pipeline 20 is equipped with a nitrogen inlet pressure gauge 21 and a nitrogen inlet flow meter 22. The pressure of the nitrogen inlet pressure gauge 21 is controlled to be less than 0.1 MPa by adjusting the valve, and the flow rate of the nitrogen inlet is controlled by the nitrogen inlet flow meter 22, so that the gas-water ratio is greater than 3:1.

[0030] Wastewater flow pipe 10 is connected to an inlet TOC detector 90, and the treated wastewater outflow pipe 40 is also connected to an outlet TOC detector 100. The inlet TOC detector 90 detects the organic matter content of the inlet water, and the outlet TOC detector 100 detects the organic matter content of the treated water. These two instruments are used to monitor the performance of the volatile organic compound removal membrane contactor.

[0031] The wastewater flow pipeline 10 includes a first lifting section 101, a first horizontal section 102, a second descending section 103, and a second horizontal section 104. A lifting pump 11 is installed at the bottom inlet of the first lifting section 101. An inlet flow meter 12 is integrated on the first lifting section 101. Several security filters 13 are installed on the second descending section 103. The outlet of the second horizontal section 104 is connected to the wastewater inlet 2 of the first volatile organic compound removal membrane contactor 50 through a vertical connecting pipe 105.

[0032] In a specific embodiment, a control cabinet 110 is also included, which contains electrical equipment and automatic control programs to ensure that the entire device can operate fully automatically.

[0033] The working principle of the volatile organic compound removal membrane contactor is as follows: Figure 2 The gas transfer membrane material used is a selectively permeable material. The volatile organic compound (VOC) removal membrane contactor contains a large number of hollow fibers with tiny pores on the fiber walls. Only gas molecules can pass through these micropores, allowing gas to permeate bidirectionally while liquids cannot. Gas-liquid contact is established on both sides of the material. Gas flow carries gas from the liquid into the liquid, reducing the gas content in the liquid. During operation, wastewater containing VOCs is pressurized to 0.4 MPa by a booster pump, then filtered through a security filter to remove impurities, reducing the turbidity to less than 0.1 NTU before entering the VOC removal membrane contactor. Nitrogen gas enters the nitrogen purging pipeline. The pressure of the purging nitrogen inlet pressure gauge 21 is controlled to be less than 0.1 MPa by adjusting the valve, and the flow rate of the purging nitrogen is controlled by the purging nitrogen inlet flow meter 22, so that the gas-to-water ratio is greater than 3:1. A vacuum is created by the liquid ring vacuum pump to form a negative pressure. Due to the negative pressure and nitrogen purging, the volatile organic compounds dissolved in the water enter the membrane contactor and are carried out by the negative pressure drawn by the liquid ring vacuum pump. They are discharged from the outlet of the organic matter collection pipeline and enter the downstream tail gas treatment device for treatment. The water with volatile organic compounds removed flows out of the treated wastewater outlet pipeline. It can remove volatile organic compounds in water to below 1 ppm, and the operating energy consumption of the device is low.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An apparatus for removing volatile organic compounds from water, comprising: It comprises: a wastewater flow pipeline; a nitrogen purge pipeline; an organic matter collection pipeline; a treated wastewater outflow pipeline; and at least one group of devolatilization organic matter membrane contactors, each group of devolatilization organic matter membrane contactors comprising a contactor body, a wastewater inlet, a wastewater outlet, a purge gas inlet, a volatile organic matter outlet, the wastewater inlets and the wastewater outlets of all the devolatilization organic matter membrane contactors being sequentially connected in series to form a total wastewater inlet and a total wastewater outlet corresponding to the wastewater flow pipeline; the inlet of the wastewater flow pipeline is integrated with a booster pump, and the wastewater flow pipeline is provided with a water inflow flowmeter and a plurality of safety filters along the wastewater flow direction; an external wastewater pipeline is connected to the inlet of the booster pump, the outlet of the wastewater flow pipeline is connected to the wastewater inlet of the first devolatilization organic matter membrane contactor, i.e. the total wastewater inlet, the wastewater outlet of the last devolatilization organic matter membrane contactor, i.e. the total wastewater outlet, is externally connected to the inlet of the treated wastewater outflow pipeline, the nitrogen purge pipeline is connected in parallel to each purge gas inlet, and each volatile organic matter outlet is connected in parallel to the inlet of the organic matter collection pipeline, which is integrated with a liquid ring vacuum pump, and the outlet of the organic matter collection pipeline is externally connected to a tail gas treatment device.

2. The apparatus for removing volatile organic compounds in water according to claim 1, wherein: The number of devolatilization organic matter membrane contactors is two groups, and the two groups of devolatilization organic matter membrane contactors are arranged vertically in parallel, with the wastewater inlets located below and the wastewater outlets located above, and the two groups of devolatilization organic matter membrane contactors are respectively a first devolatilization organic matter membrane contactor and a second devolatilization organic matter membrane contactor, and the top wastewater outlet of the first devolatilization organic matter membrane contactor is connected to the bottom wastewater inlet of the second devolatilization organic matter membrane contactor through a bent connecting pipeline to form a series mechanism.

3. The apparatus for removing volatile organic compounds in water according to claim 1, wherein: The nitrogen purge pipeline is integrated with a nitrogen inlet pressure gauge and a nitrogen inlet flowmeter.

4. The apparatus for removing volatile organic compounds in water according to claim 1, wherein: The wastewater flow pipeline is connected with a water inlet TOC detector, and the treated wastewater outflow pipeline is also externally connected with a water outlet TOC detector.

5. The apparatus for removing volatile organic compounds in water according to claim 2, wherein: The wastewater flow pipeline comprises a first lifting section, a first horizontal section, a second descending section, and a second horizontal section, the bottom inlet of the first lifting section is provided with a booster pump, the first lifting section is integrated with a water inflow flowmeter, the second descending section is provided with a plurality of safety filters, and the outlet of the second horizontal section is connected to the wastewater inlet of the first devolatilization organic matter membrane contactor through a vertical connecting pipeline.

6. The apparatus for removing volatile organic compounds in water according to claim 1, wherein: It further comprises a control electric cabinet containing electrical equipment and automatic control programs.

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