Advanced treatment device for Shuanghuanglian production wastewater for upgrading and reconstruction

Abstract

The utility model relates to an advanced treatment device for Shuanghuanglian production wastewater for upgrading and reconstruction, which can effectively solve the problem that secondary effluent of the existing wastewater treatment process of Shuanghuanglian production or pharmaceutical enterprises cannot meet the current sewage treatment comprehensive discharge standard. A water outlet of the MBR membrane tank is communicated with a water inlet of the micro-nano bubble-catalytic ozonation tower through a pipeline, a water outlet of the micro-nano bubble-catalytic ozonation tower is communicated with a water inlet of the buffer tank through a pipeline, and a water outlet of the buffer tank is communicated with a water inlet of the BAF through a pipeline; according to the utility model, the defects of weak oxidation capacity, low reaction rate, poor selectivity and the like of the traditional ozone oxidation technology in wastewater treatment are overcome, and the biodegradability and the effluent standard of wastewater are improved; the advanced treatment device is an innovation of the Shuanghuanglian production wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a deep treatment device for Shuanghuanglian production wastewater used for upgrading and transformation. Background Technology

[0002] Shuanghuanglian (a traditional Chinese medicine) manufacturers primarily use Scutellaria baicalensis for extraction. The resulting wastewater mainly comprises production wastewater and a small amount of domestic and office wastewater. Production wastewater mainly includes wastewater from washing and soaking herbs in the pretreatment workshop, decoction wastewater from the Scutellaria baicalensis extraction workshop, and some extract and rinsing discharge wastewater. The wastewater is acidic, with a pH of approximately 1.0-2.0. It mainly contains residues of active ingredients from traditional Chinese medicine, lignin, cellulose, hemicellulose, aged macroporous resin, organic solvents (ethanol), glycosides, anthraquinones, alkaloids, and their hydrolysis products. It is characterized by complex composition, high organic concentration, high suspended solids, and high sulfide content. Furthermore, the wastewater volume fluctuates significantly over time. The concentration of pollutants is also high, with COD generally exceeding 30,000 mg / L and BOD5 relatively low, generally below 10,000 mg / L.

[0003] Currently, the main treatment process for this type of wastewater typically employs a combination of coagulation sedimentation + ABR (anaerobic baffled reactor) + UBF (upflow sludge bed filter) + aerated sedimentation + A / O (air / water separation) processes, with the COD of the secondary sedimentation tank effluent being approximately 100-120 mg / L. As comprehensive wastewater discharge standards are raised across various regions, with effluent standards now reaching Grade I or the Yellow River Basin discharge standards, wastewater treatment plants in relevant enterprises face upgrades to meet local government-mandated discharge standards. In addition to optimizing existing processes, further advanced treatment processes are needed at the downstream end. There is an urgent need for a technology that can further degrade recalcitrant pollutants, has low investment costs, and is easy to maintain and manage, in order to achieve effluent compliance with discharge standards. Therefore, the invention of a wastewater advanced treatment device is imperative. Summary of the Invention

[0004] In view of the above situation and to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a method for deep treatment of Shuanghuanglian production wastewater, which can effectively solve the problem that the secondary effluent of the existing wastewater treatment process of Shuanghuanglian production or pharmaceutical enterprises cannot meet the current comprehensive sewage discharge standards.

[0005] The technical solution provided by this utility model includes an MBR membrane tank, a micro-nano bubble-ozone catalytic oxidation tower, a buffer tank, a BAF aerated biological filter, and a fiber disc filter. The outlet of the MBR membrane tank is connected to the inlet of the micro-nano bubble-ozone catalytic oxidation tower via a pipe. The outlet of the micro-nano bubble-ozone catalytic oxidation tower is connected to the inlet of the buffer tank via a pipe. The outlet of the buffer tank is connected to the inlet of the BAF aerated biological filter via a pipe. The outlet of the BAF aerated biological filter is connected to the inlet of the fiber disc filter via a pipe.

[0006] This invention uses micro-nano bubble-ozone catalytic oxidation to overcome the shortcomings of traditional ozone oxidation technology in wastewater treatment, such as weak oxidation capacity, low reaction rate, and poor selectivity. It effectively eliminates the biological toxicity in wastewater treatment, improves the biodegradability and effluent standards of wastewater, and is an innovation in the deep treatment device for Shuanghuanglian production wastewater. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structural connection frame of this utility model.

[0008] Figure 2 This is a structural connection diagram of the micro / nano bubble-ozone catalytic oxidation tower of the present invention. Detailed Implementation

[0009] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples.

[0010] Depend on Figure 1 The present invention comprises an MBR membrane tank, a micro-nano bubble-ozone catalytic oxidation tower, a buffer tank, a BAF aerated biological filter, and a fiber disc filter. The outlet of the MBR membrane tank is connected to the inlet of the micro-nano bubble-ozone catalytic oxidation tower via a pipe. The outlet of the micro-nano bubble-ozone catalytic oxidation tower is connected to the inlet of the buffer tank via a pipe. The outlet of the buffer tank is connected to the inlet of the BAF aerated biological filter via a pipe. The outlet of the BAF aerated biological filter is connected to the inlet of the fiber disc filter via a pipe.

[0011] To ensure optimal performance, the MBR membrane module is a hollow fiber membrane or a flat sheet membrane.

[0012] The aforementioned micro-nano bubble-ozone catalytic oxidation tower consists of a cylindrical tower body, an ozone generator, and a micro-nano bubble generator. The ozone outlet of the ozone generator is connected to the air inlet of the micro-nano bubble generator via a pipe. The micro-nano bubble generator is connected to an ozone delivery pipe located at the bottom of the tower body. The ozone delivery pipe is equipped with a flow control valve. The tower body is filled with a catalyst. A water inlet pipe is located at the top of the tower body, and a water outlet pipe is located at the bottom. The water inlet pipe is connected to a nozzle inside the tower body, which can spray wastewater into the tower in the form of a spray, increasing the contact area between the wastewater and the ozone micro-nano bubbles.

[0013] The catalyst loading amount (volume) of the micro-nano bubble-ozone catalytic oxidation tower accounts for 1 / 5 to 1 / 3 of the oxidation tower.

[0014] The filtration accuracy of the fiber disc filter is 10-20 μm.

[0015] The application of this invention is as follows: The wastewater from the production of Shuanghuanglian (a traditional Chinese medicine) contains lignocellulose, a recalcitrant high-molecular-weight organic compound, as well as polysaccharides, flavonoids, and other substances with bioinhibitory properties. Conventional physicochemical and biochemical treatments are insufficient to meet the Class I wastewater discharge standards. This invention utilizes a modified micro-nano bubble-ozone catalytic oxidation process. The ozone catalytic oxidation technology involves ozone adsorbing onto the catalytically active centers of a catalyst and decomposing to generate highly oxidizing hydroxyl radicals (•OH) and superoxide anion radicals (•O2). − Active substances such as microbubbles and nanobubbles trigger free radical chain reactions on the catalyst surface and in the solution, decomposing organic matter. The introduction of microbubbles and nanobubbles further accelerates the reaction process because, compared with ordinary microporous aeration, it can improve the mass transfer efficiency of ozone, reduce ineffective ozone decomposition, increase ozone concentration, and further enhance the efficiency of ozone catalytic oxidation. This utility model of MBR and BAF combined process is an extension of traditional processes to achieve emission standards. The effluent from the secondary sedimentation tank passes through the MBR, which can both intercept suspended solids and maintain a high sludge concentration in the membrane tank, degrading undegraded organic matter as much as possible. Before entering the microbubble-ozone catalytic oxidation, COD is reduced to 70-90 mg / L. Microbubble-ozone catalysis has the characteristics of strong oxidation capacity, small footprint, and no secondary pollution. It can directly degrade or transform undegraded large molecular organic matter in the biochemical part into easily degradable small molecular organic matter. Then, through biological (BAF) and filtration treatment, pollutants are removed, ensuring that the effluent COD is stable at 30-40 mg / L, which has been proven by field practice.

[0016] Example 1: A Shuanghuanglian (a traditional Chinese medicine) production enterprise generates a peak wastewater volume of 120 m³ / day. The main raw material is Astragalus membranaceus. The existing wastewater treatment process adopts the method of "coagulation sedimentation + ABR (anaerobic baffled reactor) + UBF (upflow sludge bed filter) + A / O + filtration + secondary sedimentation tank". The current effluent indicators are: COD: 133.9 mg / L, NH3-N: 20.76 mg / L, TN: 50.89 mg / L, TP: 0.85 mg / L.

[0017] The effluent from the secondary sedimentation tank enters the MBR tank. In the MBR membrane tank, the sludge retention time is controlled at 3.5 hours, dissolved oxygen at 4 mg / L, and the sludge concentration is maintained at 10,000 mg / L, resulting in an MBR effluent COD of 85 mg / L. The MBR effluent is then pumped into a micro-nano bubble-ozone catalytic oxidation tower. This tower contains a precious metal ozone catalyst, with the packing material occupying 1 / 5 of the tower's volume, packed in two layers. The ozone concentration is controlled at 50%, and the reaction time is 120 minutes, resulting in an effluent COD of 45 mg / L. The effluent from the oxidation tower enters an intermediate buffer tank, where ozone further oxidizes and decomposes organic matter, preventing harm to the microorganisms in the subsequent internal circulation BAF (Biological Aeration Filter). The buffer tank water is then pumped into the BAF aerated biological filter, where dissolved oxygen is controlled at 2 mg / L, resulting in an effluent COD of 37 mg / L. The BAF effluent then enters a 10 μm fiber disc filter to remove suspended solids before being discharged in compliance with standards.

[0018] Comparative Example 1 (different from Example 1, without the addition of a precious metal ozone catalyst):

[0019] The effluent from the secondary sedimentation tank enters the MBR tank. In the MBR membrane tank, the sludge retention time is controlled at 3.5 hours, dissolved oxygen at 4 mg / L, and the sludge concentration is maintained at 10,000 mg / L, resulting in an MBR effluent COD of 85 mg / L. The MBR effluent is then pumped into a micro-nano bubble-ozone catalytic oxidation tower (empty tower), where the ozone concentration is controlled at 50% and the reaction time at 120 minutes, resulting in an effluent COD of 68 mg / L. The oxidation tower effluent enters an intermediate buffer tank, where ozone further oxidizes and decomposes organic matter, preventing harm to the microorganisms in the subsequent internal circulation BAF (Biological Aeration Filter). The buffer tank water is then pumped into the BAF aerated biological filter, where dissolved oxygen is controlled at 2 mg / L, resulting in an effluent COD of 61 mg / L. The BAF effluent then enters a 10 μm fiber disc filter, but even after removing suspended solids, the COD still does not meet the standards.

[0020] Comparative Example 2 (different from Example 1, without the addition of a precious metal ozone catalyst, and with the ozone oxidation time extended to 4 hours):

[0021] The effluent from the secondary sedimentation tank enters the MBR tank. In the MBR membrane tank, the sludge retention time is controlled at 3.5 hours, dissolved oxygen at 4 mg / L, and the sludge concentration is maintained at 10,000 mg / L, resulting in an MBR effluent COD of 85 mg / L. The MBR effluent is then pumped into a micro-nano bubble-ozone catalytic oxidation tower (empty tower), where the ozone concentration is controlled at 50% and the reaction time at 240 minutes, resulting in an effluent COD of 90.3 mg / L. The oxidation tower effluent enters an intermediate buffer tank, where ozone further oxidizes and decomposes organic matter, preventing harm to the microorganisms in the subsequent internal circulation BAF (Biological Aeration Filter). The buffer tank water is then pumped into the BAF aerated biological filter, where dissolved oxygen is controlled at 2 mg / L, resulting in an effluent COD of 80 mg / L. The BAF effluent then enters a 10 μm fiber disc filter, but even after removing suspended solids, the standards are still not met.

[0022] The above experiments verified the single-factor effects of catalyst and catalytic oxidation reaction time on the secondary sedimentation tank effluent of Shuanghuanglian production wastewater treated by micro-nano bubble-ozone catalytic treatment. The optimal solution of this invention for treating this type of wastewater was obtained. The micro-nano bubble-ozone catalytic oxidation, MBR and BAF combined process proposed in this invention adapts to the new standards and requirements of the environmental protection industry and is suitable for promotion and application in the deep treatment of wastewater from pharmaceutical companies. It is an innovation in the deep treatment device for Shuanghuanglian production wastewater and has good economic and social benefits.

[0023] It should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any person skilled in the art who can make modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution shall fall within the protection scope of the present utility model.

Claims

1. A deep treatment device for Shuanghuanglian production wastewater used in upgrading and renovation, characterized in that, It includes an MBR membrane tank, a micro-nano bubble-ozone catalytic oxidation tower, a buffer tank, a BAF aerated biological filter, and a fiber disc filter. The outlet of the MBR membrane tank is connected to the inlet of the micro-nano bubble-ozone catalytic oxidation tower via a pipe. The outlet of the micro-nano bubble-ozone catalytic oxidation tower is connected to the inlet of the buffer tank via a pipe. The outlet of the buffer tank is connected to the inlet of the BAF aerated biological filter via a pipe. The outlet of the BAF aerated biological filter is connected to the inlet of the fiber disc filter via a pipe.

2. The advanced treatment device for Shuanghuanglian production wastewater for upgrading and transformation according to claim 1, characterized in that, The MBR membrane module is in the form of a hollow fiber membrane or a flat sheet membrane.

3. The advanced treatment device for Shuanghuanglian production wastewater for upgrading and transformation according to claim 1, characterized in that, The micro-nano bubble-ozone catalytic oxidation tower consists of a cylindrical tower body, an ozone generator, and a micro-nano bubble generator. The ozone outlet of the ozone generator is connected to the air inlet of the micro-nano bubble generator via a pipe. The micro-nano bubble generator is connected to an ozone delivery pipe located at the bottom of the tower body. The ozone delivery pipe is equipped with a flow control valve. The tower body is filled with a catalyst. A water inlet pipe is located at the top of the tower body, and a water outlet pipe is located at the bottom. The water inlet pipe is connected to a nozzle inside the tower body.

4. The advanced treatment device for Shuanghuanglian production wastewater for upgrading and transformation according to claim 1, characterized in that, The catalyst loading of the micro-nano bubble-ozone catalytic oxidation tower accounts for 1 / 5 to 1 / 3 of the oxidation tower.

5. The advanced treatment device for Shuanghuanglian production wastewater for upgrading and transformation according to claim 1, characterized in that, The filtration accuracy of the fiber disc filter is 10-20 μm.

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