Caprolactam wastewater treatment process system

Abstract

The utility model relates to a caprolactam wastewater treatment process technology, in particular to a caprolactam wastewater treatment process system, which overcomes the problem that more macromolecular organic pollutants which are difficult to degrade still remain after the treatment of a traditional biochemical and MBR (Membrane Bioreactor) membrane process, and can meet the practical demand of wastewater resource utilization. The caprolactam wastewater treatment system comprises a biochemical pretreatment system for carrying out biochemical pretreatment on the caprolactam wastewater, a biochemical treatment system for carrying out biochemical treatment on the caprolactam wastewater and a deep treatment system for carrying out deep treatment on the caprolactam wastewater, the biochemical pretreatment system, the biochemical treatment system and the deep treatment system are sequentially communicated, and the deep treatment system comprises an electron beam irradiation device for performing electron beam radiation ionization on the caprolactam wastewater to degrade macromolecular organic matters and an active coke adsorption tower for adsorbing the caprolactam wastewater to reduce suspended matters and COD (Chemical Oxygen Demand).

Description

Technical Field

[0001] This utility model relates to caprolactam wastewater treatment technology, and in particular to a caprolactam wastewater treatment process system. Background Technology

[0002] Caprolactam is an organic compound with the chemical formula C6H11NO. It is widely used in gears, bearings, pipes, medical devices, and electrical insulation materials. The production of caprolactam generates a large amount of caprolactam wastewater, which needs to be treated.

[0003] Among methods for treating caprolactam wastewater, biological methods are widely used due to their low economic cost and lack of secondary pollution. For example, a biochemical + MBR membrane process is often used to treat caprolactam wastewater. However, caprolactam wastewater contains difficult-to-treat macromolecular organic compounds such as benzene and cyclohexanone. Even after treatment using the traditional biochemical + MBR membrane process, a significant amount of recalcitrant macromolecular organic pollutants remain, failing to meet the practical needs of environmental remediation and wastewater resource utilization. Utility Model Content

[0004] This utility model aims to provide a caprolactam wastewater treatment process system that overcomes the problem that traditional biochemical + MBR membrane processes still leave a large number of difficult-to-degrade macromolecular organic pollutants, thus meeting the practical needs of wastewater resource utilization and further improving the company's economic and social benefits.

[0005] This utility model is achieved through the following technical solution:

[0006] A caprolactam wastewater treatment process system includes a biochemical pretreatment system for biochemical pretreatment of caprolactam wastewater, a biochemical treatment system for biochemical treatment of caprolactam wastewater, and a deep treatment system for advanced treatment of caprolactam wastewater, wherein the biochemical pretreatment system, the biochemical treatment system, and the deep treatment system are connected in sequence.

[0007] The biochemical pretreatment system includes an equalization tank for homogenizing caprolactam wastewater and a hydrolysis acidification tank for initially decomposing organic matter in caprolactam wastewater.

[0008] The deep treatment system includes an electron beam irradiation device for degrading macromolecular organic matter in caprolactam wastewater by electron beam ionization and an activated coke adsorption tower for adsorbing and reducing suspended solids and COD in caprolactam wastewater.

[0009] Furthermore, the biochemical treatment system includes a UBF tank for anaerobic decomposition of organic matter in caprolactam wastewater, an anoxic tank for denitrification to remove nitrogen oxides from caprolactam wastewater, an aerobic tank for removing ammonia nitrogen and COD from caprolactam wastewater, and an MBR membrane tank for removing suspended solids and COD from caprolactam wastewater.

[0010] Furthermore, the anoxic tank is equipped with a methanol pipeline for adding methanol solution as a carbon source to promote the denitrification reaction.

[0011] Furthermore, the aerobic tank is equipped with a sodium hydroxide pipe for adding sodium hydroxide solution to adjust the pH value and a blower for introducing oxygen.

[0012] Furthermore, the UBF tank, anoxic tank, aerobic tank, and MBR membrane tank are connected in sequence via overflow pipes.

[0013] The beneficial effects achieved by this utility model compared with the prior art are as follows:

[0014] 1. The caprolactam wastewater treatment process system described in this utility model adopts a wastewater treatment process that combines biochemical treatment, MBR membrane treatment, and advanced treatment to treat caprolactam production wastewater. The caprolactam wastewater is treated by electron beam irradiation to degrade macromolecular organic matter through electron beam radiation ionization. The caprolactam wastewater is adsorbed by activated coke adsorption tower to reduce suspended solids and COD, thereby meeting the practical needs of wastewater resource utilization and further improving the company's economic and social benefits.

[0015] 2. After treatment by a biochemical system + MBR membrane system, caprolactam production wastewater undergoes further treatment via electron beam irradiation and activated carbon adsorption. In the high-energy electron beam, the caprolactam wastewater undergoes an oxidation-reduction reaction, causing pollutants in the water to decompose, decolorize, and polymerize, improving biodegradability and sterilizing the water. Activated carbon is a mesoporous adsorbent material with numerous functional groups, used to remove COD and turbidity from wastewater.

[0016] 3. The effluent parameters of the MBR membrane tank are: COD content ≤ 120 mg / L, NH3-N ≤ 10 mg / L. If the effluent parameters of the MBR membrane are too high, the COD removal rate can reach about 70% through electron beam irradiation, which will shorten the subsequent activated carbon adsorption and regeneration cycle, thereby appropriately extending the biological treatment time, and finally reducing the effluent parameters to: COD content ≤ 40 mg / L, NH3-N ≤ 2 mg / L. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the caprolactam wastewater treatment process system described in this utility model;

[0018] In the diagram: 1. Equalization tank, 2. Hydrolysis acidification tank, 3. UBF tank, 4. Anoxic tank, 5. Aerobic tank, 6. Anaerobic tank, 7. MBR membrane tank, 8. Disinfection effluent tank, 9. Electron beam irradiation device, 10. Activated coke adsorption tower. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0021] This embodiment provides a caprolactam wastewater treatment process system, such as Figure 1 As shown, it mainly includes a biochemical pretreatment system, a biochemical treatment system, and an advanced treatment system. The biochemical pretreatment system, biochemical treatment system, and advanced treatment system are connected sequentially through pipelines. The biochemical pretreatment system is mainly used for the biochemical pretreatment of caprolactam wastewater, the biochemical treatment system is mainly used for the biochemical treatment of caprolactam wastewater, and the advanced treatment system is mainly used for the advanced treatment of caprolactam wastewater.

[0022] The biological pretreatment system includes an equalization tank 1 and a hydrolysis acidification tank 2. The biological treatment system includes a UBF tank 3, an anoxic tank 4, an aerobic tank 5, an anaerobic tank 6, and an MBR membrane tank 7. The deep treatment system includes an electron beam irradiation device 9 and an activated carbon adsorption tower 10. The equalization tank 1, hydrolysis acidification tank 2, UBF tank 3, anoxic tank 4, aerobic tank 5, MBR membrane tank 7, electron beam irradiation device 9, and activated carbon adsorption tower 10 are sequentially connected by pipelines to form a treatment system. The UBF tank 3, anoxic tank 4, aerobic tank 5, anaerobic tank 6, and MBR membrane tank 7 are connected by overflow pipes.

[0023] Anoxic tank 4 is equipped with a methanol pipeline, through which methanol solution is added as a carbon source to promote the denitrification reaction. Aerobic tank 5 is equipped with a sodium hydroxide pipeline and a blower. Sodium hydroxide solution is added through the sodium hydroxide pipeline to adjust the pH value, and oxygen is introduced through the blower.

[0024] Based on the above-described caprolactam wastewater treatment process system, this embodiment also discloses a caprolactam wastewater treatment process, which mainly includes the following steps:

[0025] Biochemical pretreatment: Caprolactam wastewater enters equalization tank 1 for homogenization and then is sent to hydrolysis acidification tank 2 to decompose and remove some organic matter;

[0026] Biological treatment: Wastewater that has undergone biological pretreatment overflows into UBF tank 3 for anaerobic decomposition of organic matter; the anaerobic effluent flows into anoxic tank 4, where denitrification is the main process. Methanol solution is added as a carbon source to promote the denitrification reaction, thereby removing nitrogen oxides, etc. The water from anoxic tank 4 enters aerobic tank 5 to remove ammonia nitrogen, COD, etc. The pH value of wastewater in UBF tank 3, anoxic tank 4, and aerobic tank 5 must be strictly controlled; after the wastewater enters MBR membrane tank 7, suspended solids and COD are further removed through the high-efficiency interception of the membrane.

[0027] Advanced treatment: The effluent from the MBR membrane tank 7 first enters the disinfection effluent tank 8 for disinfection, and then enters the electron beam irradiation device 9. After the electron beam irradiation ionization effect, it can further degrade macromolecular organic matter. After passing through the electron beam, it enters the activated carbon adsorption tower 10 for further adsorption and reduction of suspended solids and COD in the water. Sodium hypochlorite is added to the activated carbon to prevent biofilm formation on the activated carbon surface.

[0028] In this embodiment, the composition of the caprolactam wastewater before treatment is as follows:

[0029]

[0030] After undergoing the caprolactam wastewater treatment process described in this embodiment, the effluent composition is analyzed as follows:

[0031]

[0032] Traditional biological treatment combined with MBR membrane processing results in effluent from the MBR membrane tank with COD ≤ 120 mg / L and NH3-N ≤ 10 mg / L, which are excessively high. However, the process described in this embodiment achieves a COD removal rate of approximately 70% through electron beam irradiation. This shortens the subsequent activated carbon adsorption and regeneration cycle, allowing for a more appropriate extension of the biological treatment time. Ultimately, the effluent quality is reduced to COD ≤ 40 mg / L and NH3-N ≤ 2 mg / L.

[0033] The caprolactam wastewater treatment system described in this embodiment employs a combined biochemical + MBR membrane + advanced treatment process to treat caprolactam production wastewater. An electron beam irradiation device is used to ionize and degrade macromolecular organic matter in the caprolactam wastewater. An activated carbon adsorption tower is used to adsorb and reduce suspended solids and COD, thus meeting the practical need for wastewater resource utilization and further improving the company's economic and social benefits.

Claims

1. A caprolactam wastewater treatment process system, characterized in that, It includes a biochemical pretreatment system for biochemical pretreatment of caprolactam wastewater, a biochemical treatment system for biochemical treatment of caprolactam wastewater, and an advanced treatment system for advanced treatment of caprolactam wastewater, wherein the biochemical pretreatment system, the biochemical treatment system, and the advanced treatment system are connected in sequence. The biochemical pretreatment system includes an equalization tank for homogenizing caprolactam wastewater and a hydrolysis acidification tank for initially decomposing organic matter in caprolactam wastewater. The advanced treatment system includes an electron beam irradiation device for degrading macromolecular organic matter in caprolactam wastewater by electron beam ionization and an activated coke adsorption tower for adsorbing and reducing suspended solids and COD in caprolactam wastewater.

2. The caprolactam wastewater treatment process system according to claim 1, characterized in that, The biochemical treatment system includes an UBF tank for anaerobic decomposition of organic matter in caprolactam wastewater, an anoxic tank for denitrification to remove nitrogen oxides from caprolactam wastewater, an aerobic tank for removing ammonia nitrogen and COD from caprolactam wastewater, and an MBR membrane tank for removing suspended solids and COD from caprolactam wastewater.

3. The caprolactam wastewater treatment process system according to claim 2, characterized in that, The anoxic tank is equipped with a methanol pipeline for adding methanol solution as a carbon source to promote the denitrification reaction.

4. The caprolactam wastewater treatment process system according to claim 3, characterized in that, The aerobic tank is equipped with a sodium hydroxide pipeline for adding sodium hydroxide solution to adjust the pH value and a blower for introducing oxygen.

5. The caprolactam wastewater treatment process system according to any one of claims 2-4, characterized in that, The UBF tank, anoxic tank, aerobic tank, and MBR membrane tank are connected in sequence via an overflow pipe.

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