Biopharmaceutical wastewater advanced treatment and resource utilization system

Abstract

The utility model relates to the field of wastewater treatment equipment, in particular to a biological pharmaceutical wastewater advanced treatment and resource utilization system. The advanced treatment and resource utilization system comprises a homogenizing tank, a hardness removal tank, a sedimentation tank, an ultrafiltration membrane tank, a nanofiltration membrane system, a first reverse osmosis membrane system and a second reverse osmosis membrane system which are arranged in sequence.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment equipment, in particular to a system for advanced treatment and resource utilization of biopharmaceutical wastewater. Background Technique

[0002] Pharmaceutical wastewater is characterized by complex composition, high contents of inorganic salts and organic matters, high chroma, and large variations in water quality and quantity. According to the pharmaceutical process, pharmaceutical wastewater can be subdivided into 6 types, namely, mixed preparation type, bioengineering type, traditional Chinese medicine type, extraction type, chemical synthesis type, and fermentation type. Among them, the main pollution indexes of bioengineering pharmaceutical wastewater (abbreviation: biopharmaceutical wastewater) include: pH, chroma, suspended solids, COD, ammonia nitrogen, total nitrogen, and total phosphorus, etc. There are not only gradually increasing requirements for the water quality discharge standard of pharmaceutical wastewater, but also certain restrictions on the water quantity discharge, which poses a challenge to the existing pharmaceutical wastewater treatment process.

[0003] For biopharmaceutical wastewater, the commonly used treatment technologies include: physical method, chemical method, and biological method. First, a combination of physical method and chemical method is adopted to pre-treat the wastewater to improve its biodegradability. Then, the biological method is used as the core process to remove pollutants such as COD, ammonia nitrogen, and total nitrogen in the wastewater. Finally, the physical method or chemical method is used to further treat the wastewater to meet the discharge standard before discharging. At present, people have begun to conduct advanced treatment on biopharmaceutical wastewater, concentrate the wastewater through membrane separation technology, and then use mechanical vapor recompression technology (MVR) or multi-effect evaporation technology to crystallize the inorganic salts in the wastewater and treat them as solid waste.

[0004] Under the dual restrictions of discharge water quality and quantity, the old processes are difficult to meet the requirements, and it is necessary to add advanced treatment processes to further improve the water quality and reduce the discharge water quantity; the existing advanced treatment processes have low resource utilization rate for biopharmaceutical wastewater, and the separation effect of water and inorganic salts is poor; the existing advanced treatment processes are complex, with many devices, and the costs of MVR and multi-effect evaporation technologies are relatively high, resulting in great pressure on operation and maintenance management. Summary of the Invention

[0005] The utility model hopes to provide a system for advanced treatment and resource utilization of biopharmaceutical wastewater, and the specific scheme is as follows:

[0006] A system for advanced treatment and resource utilization of biopharmaceutical wastewater includes a homogenization tank, a hard removal tank, a sedimentation tank, an ultrafiltration membrane tank, a nanofiltration membrane system, a first reverse osmosis membrane system, and a second reverse osmosis membrane system, which are arranged in sequence.

[0007] A softening agent dosing pipeline is provided in front of the hard removal tank.

[0008] An acid / alkali agent dosing pipeline and a flocculant dosing pipeline are provided in front of the sedimentation tank.

[0009] The ultrafiltration membrane tank and the homogenization tank are connected by pipelines, so that the concentrated water treated by the ultrafiltration membrane tank flows into the homogenization tank.

[0010] The nanofiltration membrane system is also connected to an oxidation tank, so that the concentrated water treated by the nanofiltration membrane system can flow into the oxidation tank, and the oxidation tank is connected to the biochemical system through pipelines.

[0011] Compared with the prior art, the present technical solution mainly solves the following problems: 1) For old processes without advanced treatment, the present technology can connect with the original process to deeply treat and resourcefully utilize biopharmaceutical wastewater; 2) The existing advanced treatment technologies have poor separation effects on wastewater and inorganic salts; 3) The process equipment of the existing advanced treatment technologies is complex and the process route is long; 4) The MVR and multi-effect evaporation technologies consume a large amount of electricity, have high operating costs and are not easy to manage.

[0012] The present utility model specifically has the following advantages: 1. The biochemical effluent is pretreated by a hard removal tank and a high-density sedimentation tank to reduce the hardness and suspended solids in the wastewater. The high-density sedimentation tank integrates coagulation and sedimentation, has a high equipment integration degree, good sedimentation effect and small equipment floor area. 2. The ultrafiltration membrane tank (HMF membrane tank) is used to replace the traditional sand filter and security filter, which can further reduce the number of equipment and shorten the process flow while meeting the influent water quality requirements of the subsequent membrane process. The produced water of the ultrafiltration membrane tank enters the subsequent nanofiltration membrane treatment process, and the concentrated water is recycled to the pretreatment process section. 3. The multi-stage membrane integration technology of "nanofiltration + reverse osmosis" is adopted to effectively separate water and inorganic salts. The nanofiltration membrane is used to separate divalent salt ions from COD and monovalent salt ions. The reverse osmosis membrane is used to concentrate the produced water of the nanofiltration membrane. 4. The inorganic salts separated by the reverse osmosis membrane are directly recycled in the form of concentrated brine, eliminating the MVR and multi-effect evaporation process units, reducing the power consumption of the equipment and lowering the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a system for deep treatment and resource utilization of biopharmaceutical wastewater of the present utility model; wherein the reference numerals: 1. Homogenization tank; 2. Hard removal tank; 3. Sedimentation tank; 4. Ultrafiltration membrane tank; 5. Nanofiltration membrane system; 6. First reverse osmosis membrane system; 7. Second reverse osmosis membrane system; 8. Oxidation tank; 9. Biochemical system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following is further described in conjunction with Figure 1 for further illustration:

[0015] A system for deep treatment and resource utilization of biopharmaceutical wastewater includes a homogenization tank 1, a hard removal tank 2, a sedimentation tank 3, an ultrafiltration membrane tank 4, a nanofiltration membrane system 5, a first reverse osmosis membrane system 6 and a second reverse osmosis membrane system 7 arranged in sequence.

[0016] A softening agent dosing pipeline is provided in front of the hard removal tank 2.

[0017] Before the sedimentation tank 3, there are acid / alkali reagent dosing pipelines and flocculant dosing pipelines.

[0018] The ultrafiltration membrane tank 4 and the homogenization tank 1 are connected by pipelines, so that the concentrated water treated by the ultrafiltration membrane tank can flow into the homogenization tank.

[0019] The nanofiltration membrane system 5 is also connected to the oxidation tank 8, so that the concentrated water treated by the nanofiltration membrane system can flow into the oxidation tank, and the oxidation tank 8 is connected to the biochemical system 9 through pipelines.

[0020] The usage method of this system is as follows:

[0021] Step 1: The biochemical effluent from the original treatment process enters the equalization tank 1 of this technical solution. The equalization tank 1 adjusts the water quality and quantity of the biochemical effluent to reduce the impact on the subsequent treatment process caused by fluctuations in water quality and quantity. Step 2: The effluent from the equalization tank 1 enters the hardness removal tank 2. By adding softening agents, reactions occur with calcium, magnesium and other ions in the wastewater to form precipitates, thereby removing calcium, magnesium and other ions in the water and reducing the hardness of the biopharmaceutical wastewater. The softening agents added are one or more of lime, sodium hydroxide, calcium oxide, etc. Step 3: The effluent from the hardness removal tank 2 enters the sedimentation tank 3. This sedimentation tank 3 adopts a high-density sedimentation tank. First, acid / alkali agents are added for pH adjustment, and then a flocculant is added for flocculation reaction. The acid / alkali agents added are sulfuric acid, hydrochloric acid, sodium hydroxide, sodium carbonate, etc. The flocculants added are polyaluminum chloride (PAC), polyacrylamide (PAM), etc. The high-density sedimentation tank integrates coagulation and sedimentation. The wastewater and the flocculant enter the reaction zone of the high-density sedimentation tank together. Through mechanical stirring, the colloidal substances in the wastewater are destabilized and aggregated under the action of the flocculant to form flocs, which adsorb impurities such as suspended solids in the water and reduce the suspended solid concentration in the wastewater. Subsequently, the wastewater enters the sedimentation zone of the high-density sedimentation tank. The upper part of the sedimentation zone is a water collection trough, the middle part is inclined plate sedimentation, and the bottom part is a sludge collection zone. The effluent from the reaction zone enters the sedimentation zone from the bottom, and efficient sedimentation is carried out using the inclined plates in the sedimentation zone. The supernatant is collected through the water collection trough above the inclined plates and flows into the ultrafiltration membrane tank. Step 4: The ultrafiltration membrane tank 4 adopts HMF technology. HMF is ultra-low pressure filtration. When operating, the water production pressure is -0.005 to -0.05 Mpa. The ultra-low pressure filtration system not only ensures the safety and stability of the membrane system but also enables the system to maintain a low operating power consumption. The reflux ratio of the HMF system is 20% - 30% of the water production volume. The lower reflux ratio increases the water production volume. The water produced by the HMF system enters the subsequent nanofiltration membrane treatment unit, while the concentrated water is refluxed to the equalization tank. Step 5: A nanofiltration membrane system 5 is used to separate divalent salt ions, COD, and monovalent salt ions. Utilizing the selective permeability of the nanofiltration membrane, divalent salt ions and COD in the wastewater are intercepted, while monovalent salt ions pass through the nanofiltration membrane and flow into the subsequent membrane treatment unit. Step 6: The concentrated water from the nanofiltration membrane system 5 enters the oxidation tank 8. The oxidation tank 8 adopts an advanced oxidation technology of ozone oxidation. Using the strong oxidizing property of ozone, COD is decomposed into small molecular organic substances that can be utilized by activated sludge. The wastewater after ozone oxidation is refluxed to the biochemical system 9 of the original treatment process and used as a supplementary carbon source for the microorganisms in the activated sludge. Step 7: The water produced by the nanofiltration membrane system 5 enters the first reverse osmosis membrane system 6 and the second reverse osmosis membrane system to further separate and concentrate water and monovalent salt ions. The water produced by the reverse osmosis membrane system is reused. The concentrated water contains high-concentration monovalent salt ions and can be reused as industrial salt. The monovalent salt ions are mainly sodium chloride. The above are the specific operation steps of this embodiment. Through these steps, the biopharmaceutical wastewater can be deeply treated, and the wastewater and salt resources can be effectively separated and utilized resourcefully.

[0022] The beneficial effects of this solution are as follows: 1. Shorten the process flow. This technical solution uses a high-density sedimentation tank, HMF technology, etc. to shorten the process flow, reducing the number of equipment and the floor area at the same time. 2. Improve the separation effect of water and inorganic salts. Through the multi-stage membrane integration technology and optimized operating parameters, the effective separation of inorganic salts in biopharmaceutical wastewater is achieved. 3. Reduce the operating energy consumption. The MVR and multi-effect evaporation technologies are eliminated, reducing the power consumption of the equipment. 4. Convenient operation and management. The entire treatment system has relatively few and mature equipment, can realize automatic operation control, and reduces the operation and maintenance pressure.

[0023] The influent of this technology comes from the biochemical system of the original treatment process, which can be maximally compatible with the original treatment process and is applicable to the quality improvement and transformation of the original biopharmaceutical wastewater. Secondly, this technical solution uses multi-stage membrane integration technologies such as HMF, nanofiltration, and reverse osmosis. By optimizing the operating parameters, it has a good separation effect on water and inorganic salts, and the separated inorganic salts are directly recycled in the form of concentrated brine. Finally, this technical solution is highly integrated, with a small equipment floor area, a short process flow, a low equipment operating cost, can realize automatic operation, and is convenient for operation and maintenance management.

[0024] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A biopharmaceutical wastewater deep treatment and resource utilization system, characterized by: The invention comprises a homogenizing tank, a hardness removal tank, a sedimentation tank, an ultrafiltration membrane tank, a nanofiltration membrane system, a first reverse osmosis membrane system and a second reverse osmosis membrane system which are arranged in sequence.

2. A biopharmaceutical wastewater deep treatment and resource utilization system as claimed in claim 1, characterized in that: A softening agent dosing pipeline is arranged in front of the hardness removal tank.

3. A biopharmaceutical wastewater deep treatment and resource utilization system as claimed in claim 1, characterized in that: An acid / alkali agent dosing pipeline and a flocculant dosing pipeline are arranged in front of the sedimentation tank.

4. A biopharmaceutical wastewater deep treatment and resource utilization system as claimed in claim 1, characterized in that: The ultrafiltration membrane pool and the homogenization pool are connected via a pipeline.

5. A biopharmaceutical wastewater deep treatment and resource utilization system as claimed in claim 1, characterized in that: The nanofiltration membrane system is also connected to an oxidation pool, and the oxidation pool is connected to the biochemical system through a pipeline.

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