An ecological industrial park tail water recycling treatment system

Abstract

This invention discloses a wastewater reuse treatment system for an eco-industrial park, belonging to the field of wastewater reuse treatment technology. It includes a wastewater collection and classification module, a multi-stage classification treatment module, an energy comprehensive recovery and utilization module, an intelligent monitoring and control module, and a precise reuse allocation module. The wastewater collection and classification module collects wastewater generated by various enterprises within the eco-industrial park and performs preliminary classification based on the wastewater's source and composition, then transports different categories of wastewater to corresponding treatment units. Based on the wastewater classification results, the multi-stage classification treatment module employs targeted treatment methods for wastewater with different compositions, such as anaerobic-aerobic combined treatment processes, chemical precipitation-ion exchange combined treatment processes, and reverse osmosis membrane treatment technology. This effectively removes pollutants such as organic matter, heavy metals, and salts from the wastewater, ensuring that the treated reuse water meets the reuse water standards of the enterprises within the park.

Description

Technical Field

[0001] This invention relates to the field of wastewater reuse and treatment technology, and in particular to a wastewater reuse and treatment system for an eco-industrial park. Background Technology

[0002] With the rapid development of global industry, water scarcity has become an increasingly serious problem and a key factor restricting sustainable industrial development. Eco-industrial parks, as a new industrial development model, aim to achieve coordinated economic development and environmental protection through industrial symbiosis and resource recycling. However, in actual operation, eco-industrial parks face severe water use challenges.

[0003] On the one hand, the production activities of numerous enterprises within the industrial park generate enormous demand for water resources, and different enterprises have varying water quality requirements due to differences in their production processes. Traditional water supply models often fail to meet the diverse water needs of these enterprises, forcing some to adopt high-cost, high-quality water sources, thus increasing production costs. On the other hand, enterprises in the park generate a large amount of wastewater during their production processes. If this wastewater is discharged directly without effective treatment, it not only wastes water resources but also causes serious pollution to the surrounding environment. Currently, although some industrial parks have constructed wastewater treatment facilities, the wastewater reuse rate is generally low, and a large amount of pre-treated wastewater is still discharged, failing to maximize the utilization of water resources and further exacerbating the water shortage situation in the parks.

[0004] Moreover, most existing wastewater treatment technologies employ single processes, such as biological, chemical, or physical treatment. While these single processes are effective in treating specific types of pollutants, they often fail to achieve ideal treatment results for wastewater from complex eco-industrial parks. For example, biological treatment processes are effective at removing organic matter, but have limited capacity to remove heavy metals and salts; chemical treatment processes, while effective at removing heavy metals, may cause secondary pollution and are costly; physical treatment processes, such as filtration and sedimentation, are ineffective at removing fine particles and dissolved pollutants. Due to the limitations of these treatment processes, the treated wastewater quality often fails to meet the diverse reuse standards of different enterprises within the park, resulting in low reuse rates.

[0005] Furthermore, most existing effluent treatment systems lack intelligent monitoring and control functions, relying primarily on manual operation and periodic testing to control the operating parameters of the treatment process. This traditional control method has many drawbacks, such as slow response speed and low adjustment accuracy. Because it is impossible to monitor changes in effluent quality and treatment requirements in real time, the operating parameters of the treatment process are difficult to adjust promptly, leading to unstable treatment results.

[0006] Therefore, we provide a wastewater reuse and treatment system for eco-industrial parks. Summary of the Invention

[0007] The purpose of this invention is to solve the problems in the prior art by proposing a wastewater reuse and treatment system for eco-industrial parks.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An eco-industrial park wastewater reuse and treatment system includes a wastewater collection and classification module, a multi-stage classification and treatment module, an energy comprehensive recovery and utilization module, an intelligent monitoring and control module, and a precise reuse and distribution module.

[0010] The wastewater collection and classification module is used to collect wastewater generated by various enterprises in the eco-industrial park, and to perform preliminary classification according to the source and composition of the wastewater, and to transport different categories of wastewater to the corresponding treatment units.

[0011] The multi-level classification and processing module uses different treatment processes to classify and process the effluent based on the effluent classification results.

[0012] The energy integrated recovery and utilization module is set in the multi-level classification and treatment module and is used to recover and utilize the thermal energy and chemical energy in the effluent.

[0013] The intelligent monitoring and control module consists of sensors, a data acquisition module, and an intelligent controller. It is used to monitor the quality and quantity of effluent and the demand for reused water in real time, and to automatically adjust the operating parameters of the treatment process.

[0014] The precise reuse allocation module accurately allocates the treated reused water to various enterprises within the park based on information from the intelligent monitoring and control module and the reused water allocation model.

[0015] Preferably, in the multi-stage classification and treatment module, an anaerobic-aerobic combined treatment process is adopted for high-concentration organic wastewater. First, the organic matter is decomposed into small molecules in an anaerobic reactor under the action of anaerobic microorganisms. Then, the wastewater after the anaerobic reaction is introduced into an aerobic reactor, where organic matter is further removed under the action of aerobic microorganisms.

[0016] Preferably, in the multi-level classification and treatment module, a chemical precipitation-ion exchange combined treatment process is adopted for heavy metal wastewater. First, the heavy metal wastewater is introduced into a chemical precipitation tank, and a precipitant is added to form heavy metal ions into precipitation. Then, the precipitated wastewater is introduced into an ion exchange column, and residual heavy metal ions are removed by using ion exchange resin.

[0017] Preferably, in the multi-stage classification and treatment module, reverse osmosis membrane treatment technology is used for saline wastewater. The salt and impurities in the wastewater are removed through the selective permeation of the reverse osmosis membrane to obtain reusable freshwater.

[0018] Preferably, the heat recovery device in the energy integrated recovery and utilization module is equipped with heat exchangers in the anaerobic reactor and the aerobic reactor, and the waste heat in the effluent is recovered through the heat exchangers to provide heat for the treatment process.

[0019] Preferably, the chemical energy recovery device in the energy integrated recovery and utilization module includes a microbial fuel cell device in the wastewater treatment unit containing organic matter, which converts the chemical energy in the wastewater into electrical energy to power some of the system equipment.

[0020] Preferably, in the intelligent monitoring and control module, sensors are installed at each processing stage and effluent collection point of the system to monitor the water quality parameters, water quantity, and reclaimed water demand of the effluent in real time. The data acquisition module transmits the data collected by the sensors to the intelligent controller. The intelligent controller analyzes and processes the data according to the preset processing model and algorithm, and automatically adjusts the operating parameters of the treatment process.

[0021] Preferably, the intelligent controller automatically adjusts the aeration rate of the aerobic reactor according to the COD concentration of the effluent, and automatically adjusts the dosage of chemicals in the chemical precipitation tank according to the heavy metal concentration.

[0022] Preferably, the precise reuse allocation module establishes a reuse water allocation model based on the water demand and water quality requirements of each enterprise in the park, taking into account factors such as enterprise production processes, water-using equipment, and water usage time. The module then calculates the optimal reuse water allocation scheme for each enterprise through an optimization algorithm.

[0023] Preferably, the precise reuse distribution module distributes the treated reused water to each enterprise through a distribution control valve and a reused water delivery pipeline, and a metering device is installed on the reused water delivery pipeline to monitor and measure the reused water flow rate in real time.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The wastewater reuse and treatment system in this eco-industrial park employs multi-stage classification and treatment modules. It utilizes targeted treatment methods such as anaerobic-aerobic combined treatment, chemical precipitation-ion exchange combined treatment, and reverse osmosis membrane treatment technology to effectively remove pollutants such as organic matter, heavy metals, and salts from the wastewater, ensuring that the treated reused water meets the reuse standards of all enterprises within the park. The precise reuse allocation module rationally distributes reused water to different enterprises based on their water needs and quality requirements, achieving large-scale wastewater reuse. Actual operation has verified a significant increase in the park's wastewater reuse rate, greatly reducing reliance on fresh water, effectively alleviating the park's water shortage situation, and ensuring stable production and sustainable development for enterprises within the park.

[0026] 2. The comprehensive energy recovery and utilization module plays a crucial role in the system. The heat recovery unit, by installing heat exchangers in the anaerobic and aerobic reactors, successfully recovered waste heat from the effluent, providing some heat for the treatment process and reducing the system's consumption of external energy. The chemical energy recovery unit utilizes microbial fuel cell technology to convert the chemical energy in the effluent containing organic matter into electrical energy, powering some of the system's equipment and further reducing dependence on external power grids. Through comprehensive energy recovery and utilization, the system's energy efficiency is significantly improved, effectively reducing operating costs and enhancing the park's economic and environmental benefits.

[0027] 3. The intelligent monitoring and control module monitors the water quality parameters, quantity, and reclaimed water demand of the effluent in real time by installing sensors at each treatment stage and effluent collection point, and transmits the data to the intelligent controller. The intelligent controller analyzes and processes the data according to a preset treatment model and algorithm, automatically adjusting the operating parameters of the treatment process, such as the aeration rate of the aerobic reactor and the dosage of chemicals in the chemical sedimentation tank. This intelligent monitoring and control method can respond promptly to changes in effluent quality and treatment needs, ensuring that the treatment process is always in optimal operating condition, and that the treated reclaimed water quality consistently meets standards. Simultaneously, the precise reclaimed water allocation module, based on the information provided by the intelligent monitoring and control module and combined with the reclaimed water allocation model, calculates the optimal reclaimed water allocation scheme for each enterprise through optimization algorithms. It then achieves precise allocation and real-time monitoring of reclaimed water through allocation control valves and metering devices, further ensuring the rational utilization of reclaimed water and water quality safety. Attached Figure Description

[0028] Figure 1 This is a system block diagram of an eco-industrial park wastewater reuse and treatment system proposed in this invention. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] The wastewater reuse and treatment system of this eco-industrial park consists of a wastewater collection and classification module, a multi-stage classification and treatment module, an energy comprehensive recovery and utilization module, an intelligent monitoring and control module, and a precise reuse and distribution module.

[0031] The wastewater collection and sorting module strategically places wastewater collection points in the production areas of various enterprises within the park, collecting wastewater generated by each enterprise through a pipeline network. The wastewater is initially sorted based on its source and composition. The sorted wastewater is then precisely transported via dedicated pipelines to the corresponding treatment units within the multi-stage sorting and treatment module.

[0032] The multi-level classification and treatment module applies different treatment processes to classify and treat effluent according to its classification results. An energy recovery and utilization module is embedded within the multi-level classification and treatment module to recover and utilize the thermal and chemical energy in the effluent. The intelligent monitoring and control module consists of sensors, a data acquisition module, and an intelligent controller. Sensors are distributed at each treatment stage and effluent collection point to monitor effluent quality parameters, water quantity, and reclaimed water demand in real time. The data acquisition module transmits the data collected by the sensors to the intelligent controller. The precise reuse and allocation module, based on the information provided by the intelligent monitoring and control module and the reclaimed water allocation model, precisely allocates the treated reclaimed water to various enterprises within the park through allocation control valves and reclaimed water delivery pipelines. After treatment by this system, the effluent reuse rate in the park has significantly increased, reaching over [X]%, effectively reducing the park's dependence on fresh water and wastewater discharge.

[0033] In the multi-stage wastewater treatment module, an anaerobic-aerobic combined treatment process is used for high-concentration organic wastewater. First, the high-concentration organic wastewater is introduced into an anaerobic reactor, where anaerobic microorganisms decompose large organic molecules into smaller molecules. The organic matter removal efficiency of the anaerobic reactor can be estimated using the following formula:

[0034]

[0035] in This indicates the organic matter removal rate of the anaerobic reactor. The initial concentration of organic matter entering the anaerobic reactor. This represents the concentration of organic matter in the effluent from the anaerobic reactor.

[0036] Subsequently, the wastewater from the anaerobic reaction is introduced into an aerobic reactor, where small-molecule organic matter is continuously oxidized and decomposed by aerobic microorganisms. The formula for estimating the organic matter removal efficiency of the aerobic reactor is:

[0037]

[0038] in This indicates the organic matter removal rate of an aerobic reactor. The concentration of organic matter entering the aerobic reactor (i.e., the concentration of organic matter in the effluent from the anaerobic reactor). This refers to the concentration of organic matter in the effluent from the aerobic reactor.

[0039] In the multi-stage classification and treatment module, a combined chemical precipitation-ion exchange process is used for heavy metal wastewater. First, the heavy metal wastewater is introduced into a chemical precipitation tank, and an appropriate amount of precipitant (such as sodium hydroxide, sodium sulfide, etc.) is added to the tank. This allows the heavy metal ions to react chemically with the precipitant, forming insoluble precipitates. The removal efficiency of the chemical precipitation tank for heavy metal ions can be calculated using the following formula:

[0040]

[0041] in This indicates the heavy metal ion removal rate of the chemical precipitation tank. The initial mass of heavy metal ions entering the chemical precipitation tank. This refers to the mass of heavy metal ions in the effluent from the chemical precipitation tank.

[0042] The precipitated wastewater is then introduced into an ion exchange column, where exchangeable ions on the ion exchange resin exchange with residual heavy metal ions in the wastewater, thereby removing the residual heavy metal ions. After this combined chemical precipitation and ion exchange treatment, the concentration of heavy metal ions in the wastewater is significantly reduced.

[0043] In the multi-stage wastewater treatment module, reverse osmosis membrane technology is used to treat saline wastewater. The saline wastewater is pressurized and introduced into the reverse osmosis membrane module. Under pressure, water molecules pass through the reverse osmosis membrane, while salt and impurities in the wastewater are retained. The desalination rate of the reverse osmosis membrane is a key indicator of its performance and can be calculated using the following formula:

[0044]

[0045] in This indicates the desalination rate of the reverse osmosis membrane. This refers to the salt concentration of the feed water to the reverse osmosis membrane. The salt concentration of the permeate from the reverse osmosis membrane.

[0046] The heat recovery device in the energy comprehensive recovery and utilization module includes heat exchangers installed in both the anaerobic and aerobic reactors. As the effluent flows through the reactors, it carries a certain amount of heat. The heat exchangers transfer this residual heat to the medium required for the treatment process (such as circulating water) via heat conduction. The heat recovery efficiency of the heat exchangers can be estimated using the following formula:

[0047]

[0048] in This indicates the heat recovery efficiency of the heat exchanger. For the recovered heat, This represents the total usable heat in the tailwater.

[0049] The chemical energy recovery device in the energy comprehensive recovery and utilization module incorporates a microbial fuel cell unit within the wastewater treatment unit containing organic matter. Under the action of microorganisms, the organic matter in the wastewater undergoes an oxidation-reduction reaction, releasing electrons and protons. The electrons are transferred through an external circuit to form an electric current, thus converting the chemical energy in the wastewater into electrical energy. The output power of the microbial fuel cell can be calculated using the following formula:

[0050]

[0051] in This indicates the output power of the microbial fuel cell. For output voltage, This is the output current.

[0052] In the intelligent monitoring and control module, sensors are installed at each treatment stage and effluent collection point of the system, enabling real-time and accurate monitoring of effluent water quality parameters (such as COD, heavy metal concentration, salinity, etc.), water volume, and reclaimed water demand. The data acquisition module converts the analog signals collected by the sensors into digital signals and transmits them to the intelligent controller via wired or wireless communication. The intelligent controller analyzes and processes the received data according to a preset processing model and algorithm, determines the current effluent water quality and the operating status of the treatment process, and automatically adjusts the operating parameters of the treatment process, such as aeration rate and chemical dosage, to ensure stable and compliant treatment results.

[0053] The intelligent controller automatically adjusts the aeration rate of the aerobic reactor based on the real-time monitored COD concentration of the effluent. When the COD concentration increases, the intelligent controller increases the aeration rate according to a preset algorithm to meet the oxygen requirements of aerobic microorganisms and improve the removal efficiency of organic matter; when the COD concentration decreases, the aeration rate is appropriately reduced to save energy. The adjustment of the aeration rate can be referenced to the following relationship. ( For aeration volume, This is the proportionality coefficient. (This refers to the COD concentration in the effluent).

[0054] Meanwhile, the intelligent controller automatically adjusts the dosage of chemicals in the chemical precipitation tank based on the monitored heavy metal concentration. When the heavy metal concentration increases, the dosage of precipitant is increased to ensure sufficient precipitation of heavy metal ions; when the heavy metal concentration decreases, the dosage is reduced to lower treatment costs. Dosage adjustments can also be made based on a similar relationship. ( To increase the dosage, This is the proportionality coefficient. (This refers to the concentration of heavy metals in the effluent). Through this precise control, the treatment process is always kept in optimal operating condition.

[0055] The precise reuse allocation module establishes a reuse water allocation model based on the water demand and quality requirements of each enterprise within the park, comprehensively considering factors such as enterprise production processes, water-using equipment, and water usage time. This model aims to maximize the satisfaction of enterprises' water needs while minimizing reuse water transportation costs, using optimization algorithms (such as linear programming) to calculate the reuse water allocation for each enterprise. Through continuous iteration and optimization, the optimal reuse water allocation scheme for each enterprise is derived, ensuring the rational and efficient utilization of reused water.

[0056] The precise reuse and distribution module allocates treated reused water to various enterprises within the industrial park according to a calculated optimal distribution plan via distribution control valves and reused water delivery pipelines. Metering devices, such as electromagnetic flow meters, are installed on the reused water delivery pipelines to monitor and measure the reused water flow in real time. These metering devices transmit the collected flow data to the intelligent monitoring and control module for real-time monitoring and adjustment of the reused water distribution, ensuring accuracy and stability and meeting the production water needs of each enterprise.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wastewater reuse and treatment system for an eco-industrial park, characterized in that, It includes a tailwater collection and classification module, a multi-stage classification and treatment module, an energy comprehensive recovery and utilization module, an intelligent monitoring and control module, and a precise reuse and distribution module; The wastewater collection and classification module is used to collect wastewater generated by various enterprises in the eco-industrial park, and to perform preliminary classification according to the source and composition of the wastewater, and to transport different categories of wastewater to the corresponding treatment units. The multi-level classification and processing module uses different treatment processes to classify and process the effluent based on the effluent classification results. The energy integrated recovery and utilization module is set in the multi-level classification and treatment module and is used to recover and utilize the thermal energy and chemical energy in the effluent. The intelligent monitoring and control module consists of sensors, a data acquisition module, and an intelligent controller. It is used to monitor the quality and quantity of effluent and the demand for reused water in real time, and to automatically adjust the operating parameters of the treatment process. The precise reuse allocation module accurately allocates the treated reused water to various enterprises within the park based on information from the intelligent monitoring and control module and the reused water allocation model.

2. The wastewater reuse treatment system for the eco-industrial park according to claim 1, characterized in that, In the multi-level classification and treatment module, an anaerobic-aerobic combined treatment process is adopted for high-concentration organic wastewater. First, the organic matter is decomposed into small molecules in an anaerobic reactor under the action of anaerobic microorganisms. Then, the wastewater after the anaerobic reaction is introduced into an aerobic reactor, where organic matter is further removed under the action of aerobic microorganisms.

3. The wastewater reuse and treatment system for the eco-industrial park according to claim 1, characterized in that, In the multi-level classification and treatment module, a chemical precipitation-ion exchange combined treatment process is adopted for heavy metal wastewater. First, the heavy metal wastewater is introduced into a chemical precipitation tank, and a precipitant is added to form heavy metal ions into precipitation. Then, the precipitated wastewater is introduced into an ion exchange column, and residual heavy metal ions are removed by using ion exchange resin.

4. The wastewater reuse treatment system for the eco-industrial park according to claim 1, characterized in that, In the multi-level classification and treatment module, reverse osmosis membrane technology is used to treat saline wastewater. The salt and impurities in the wastewater are removed through the selective permeation of the reverse osmosis membrane to obtain reusable freshwater.

5. The wastewater reuse treatment system for the eco-industrial park according to claim 1, characterized in that, The heat recovery device in the energy integrated recovery and utilization module is equipped with heat exchangers in the anaerobic reactor and the aerobic reactor. The heat exchangers recover the residual heat in the effluent and provide heat for the treatment process.

6. The wastewater reuse and treatment system for the eco-industrial park according to claim 1, characterized in that, The chemical energy recovery device in the energy integrated recovery and utilization module is equipped with a microbial fuel cell device in the wastewater treatment unit containing organic matter, which converts the chemical energy in the wastewater into electrical energy to power some of the system equipment.

7. The wastewater reuse treatment system for the eco-industrial park according to claim 1, characterized in that, In the intelligent monitoring and control module, sensors are installed at each processing stage and effluent collection point of the system to monitor the water quality parameters, water quantity, and reclaimed water demand of the effluent in real time. The data acquisition module transmits the data collected by the sensors to the intelligent controller. The intelligent controller analyzes and processes the data according to the preset processing model and algorithm, and automatically adjusts the operating parameters of the treatment process.

8. The wastewater reuse treatment system for the eco-industrial park according to claim 7, characterized in that, The intelligent controller automatically adjusts the aeration rate of the aerobic reactor based on the COD concentration of the effluent, and automatically adjusts the dosage of chemicals in the chemical precipitation tank based on the heavy metal concentration.

9. The wastewater reuse treatment system for the eco-industrial park according to claim 1, characterized in that, The precise reuse allocation module establishes a reuse water allocation model based on the water demand and water quality requirements of each enterprise in the park, taking into account factors such as enterprise production processes, water-using equipment, and water usage time. It then uses an optimization algorithm to calculate the optimal reuse water allocation scheme for each enterprise.

10. The wastewater reuse treatment system for the eco-industrial park according to claim 9, characterized in that, The precise reuse distribution module distributes the treated reused water to various enterprises through distribution control valves and reused water delivery pipelines. Metering devices are installed on the reused water delivery pipelines to monitor and measure the reused water flow rate in real time.

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