Sewage recycling system and method

Abstract

The invention discloses a sewage reuse system and method. The system comprises a sewage collection module, a pretreatment module, an advanced treatment module, a water quality monitoring module, an intelligent regulation and control module, a reuse distribution module, a sludge treatment module and a medicament management module, by arranging the sewage collection module, the pretreatment module, the advanced treatment module and the like, graded purification treatment of sewage is achieved, dynamic optimization of the treatment process is achieved in combination with the water quality monitoring module and the intelligent regulation and control module, and the sewage treatment efficiency and the water quality stability are improved. The reuse distribution module realizes multi-path reasonable utilization of standard sewage, the sludge treatment module realizes resource utilization of sludge, and the agent management module guarantees accurate addition and stable supply of agents.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment and water resource recycling technology, specifically to a wastewater reuse system and method. Background Technology

[0002] Given the current increasing water scarcity, wastewater reuse has become an important way to alleviate water shortages. However, existing wastewater reuse technologies have many shortcomings: on the one hand, the treatment process is fixed and rigid, unable to be dynamically adjusted according to fluctuations in wastewater quality, leading to low treatment efficiency or overtreatment; on the other hand, there is a lack of precise monitoring and intelligent allocation mechanisms for the treated water quality, making it difficult to guarantee the safety of reuse. Furthermore, existing systems generally neglect the resource utilization of sludge and byproducts generated during wastewater treatment, causing secondary pollution and resource waste. Therefore, there is an urgent need for an integrated system and method that can achieve efficient wastewater treatment, intelligent control, safe reuse, and resource recovery. Summary of the Invention

[0003] The purpose of this invention is to provide a wastewater reuse system and method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a wastewater reuse system, comprising a wastewater collection module, a pretreatment module, an advanced treatment module, a water quality monitoring module, an intelligent control module, a reuse distribution module, a sludge treatment module, and a reagent management module;

[0005] The wastewater collection module is responsible for classifying, collecting, and transporting wastewater from different sources.

[0006] The pretreatment module performs preliminary purification treatment on the collected wastewater;

[0007] The advanced treatment module further purifies the pretreated wastewater to improve water quality;

[0008] The water quality monitoring module detects wastewater quality parameters in real time during and after the treatment process.

[0009] The intelligent control module adjusts the operating parameters of each processing module based on water quality monitoring data;

[0010] The reuse and distribution module distributes and transports compliant wastewater according to different uses;

[0011] The sludge treatment module reduces, renders harmless, and recycles the sludge generated during wastewater treatment.

[0012] The reagent management module intelligently adds and manages the inventory of chemical reagents required during the treatment process.

[0013] Preferably, the sewage collection module includes a domestic sewage collection network, an industrial wastewater collection network, and an initial rainwater collection device. Different types of sewage are collected separately through intelligent valve control, and corrosion-resistant pipes are used for transportation. A flow metering device is equipped to record the sewage transport volume in real time.

[0014] Preferably, the pretreatment module includes a bar screen filter, a sedimentation tank, and an equalization tank. The bar screen filter removes large suspended solids and floating matter from the wastewater. The sedimentation tank removes inorganic particles such as silt from the water through gravity settling. The equalization tank equalizes and regulates the quantity and quality of the wastewater.

[0015] Preferably, the advanced treatment module includes a biological treatment unit, a membrane filtration unit, and an advanced oxidation unit. The biological treatment unit utilizes microorganisms to degrade organic pollutants in wastewater, the membrane filtration unit uses a combination of ultrafiltration and reverse osmosis processes to remove fine impurities and dissolved salts from the water, and the advanced oxidation unit removes recalcitrant organic pollutants through the action of oxidants.

[0016] Preferably, the water quality monitoring module includes a pH sensor, a dissolved oxygen sensor, a turbidity sensor, a COD sensor, and an ammonia nitrogen sensor, which collects water quality data from each treatment stage in real time and transmits the data to the intelligent control module wirelessly.

[0017] Preferably, the intelligent control module is based on a PLC control system and a fuzzy control algorithm. According to the data transmitted by the water quality monitoring module, it automatically adjusts the sludge discharge cycle of the pretreatment module, the aeration rate of the deep treatment module, the operating pressure of the membrane module, and the dosage of chemicals to achieve dynamic optimization of the treatment process.

[0018] Preferably, the reuse distribution module includes a clean water storage tank, a variable frequency water pump, and a reuse pipeline network. Based on the water quality compliance status, the treated water is distributed to different reuse pathways such as domestic miscellaneous uses, greening irrigation, industrial circulating cooling, and landscape water replenishment. An online water quality monitoring terminal is provided to ensure the safety of reuse.

[0019] Preferably, the sludge treatment module includes a sludge thickening tank, a sludge dewatering machine, and a sludge resource utilization device. The sludge thickening tank reduces the water content of the sludge, the sludge dewatering machine further dewaters the sludge through plate and frame filter press or centrifugation, and the sludge resource utilization device composts the dewatered sludge or prepares biomass fuel.

[0020] Preferably, the drug management module includes a drug storage tank, an intelligent metering and dosing pump, and a drug concentration detection device. It accurately adds coagulants, flocculants, and disinfectants according to the instructions of the intelligent control module, monitors the drug storage level in real time, and issues a replenishment warning when the liquid level is low.

[0021] A wastewater reuse system includes the following steps:

[0022] Step 1, System Start-up and Parameter Setting: Operators initialize the system through the intelligent control module, setting the initial operating parameters of each treatment module, water quality compliance thresholds, reagent dosage baselines, and reuse allocation ratio parameters;

[0023] Step 2, Wastewater Collection and Transportation: The wastewater collection module collects domestic sewage, industrial wastewater, and initial runoff from rainwater through various pipe networks and devices, and then transports them to the pretreatment module after flow metering.

[0024] Step 3, Wastewater Pretreatment: The pretreatment module removes large particulate impurities through bar filtration, removes inorganic particulate matter through sedimentation in the sedimentation tank, and then enters the equalization tank for water quantity and quality adjustment.

[0025] Step 4, Advanced Wastewater Treatment: The pretreated wastewater enters the advanced treatment module, where it passes through a biological treatment unit to degrade organic pollutants, a membrane filtration unit to remove fine impurities, and an advanced oxidation unit to remove recalcitrant pollutants.

[0026] Step 5, Water Quality Monitoring: The water quality monitoring module sets up monitoring points at each stage of pretreatment, advanced treatment, and effluent outlet to monitor water quality parameters such as pH, dissolved oxygen, turbidity, COD, and ammonia nitrogen in real time and transmit them to the intelligent control module.

[0027] Step 6, Intelligent Parameter Adjustment: The intelligent control module automatically adjusts the operating parameters of pretreatment sludge discharge frequency, biological treatment aeration volume, membrane filtration pressure, and reagent dosage based on the comparison results of water quality monitoring data and preset thresholds.

[0028] Step 7, Reuse and Distribution: The treated water enters the reuse and distribution module and is transported to reuse points for domestic miscellaneous uses, greening irrigation, and industrial circulation through different pipelines according to the preset reuse ratio. The water quality is monitored at the reuse point terminal.

[0029] Step 8, Sludge Treatment: The sludge generated during the pretreatment and advanced treatment processes is transported to the sludge treatment module, where it is concentrated, dewatered, and then subjected to resource-based treatment such as composting or biomass fuel production.

[0030] Step 9, Drug Management: The drug management module accurately adds drugs according to the instructions of the intelligent control module, monitors the drug inventory in real time, and issues a replenishment prompt when the level is lower than the set value to ensure a stable drug supply.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This invention achieves graded purification of wastewater by incorporating modules for wastewater collection, pretreatment, and advanced treatment. Combined with water quality monitoring and intelligent control modules, it enables dynamic optimization of the treatment process, improving wastewater treatment efficiency and water quality stability. The reuse and distribution module allows for the rational utilization of compliant wastewater through multiple pathways, the sludge treatment module enables the resource utilization of sludge, and the chemical management module ensures precise dosing and stable supply of chemicals. The entire system integrates efficient wastewater treatment, intelligent control, safe reuse, and resource recovery, improving water resource utilization, reducing environmental pollution, and demonstrating significant economic and environmental benefits. Attached Figure Description

[0033] Figure 1 This is a system schematic diagram of the present invention;

[0034] Figure 2 This is a flowchart of the method of the present invention. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figure 1-2 The present invention provides a wastewater reuse system and method, including a wastewater collection module, a pretreatment module, an advanced treatment module, a water quality monitoring module, an intelligent control module, a reuse distribution module, a sludge treatment module, and a reagent management module;

[0037] The sewage collection module adopts a separate pipe network to collect domestic sewage, industrial wastewater and initial runoff of rainwater. The switching of the pipe network is controlled by electromagnetic valves. The pipes are made of HDPE material and equipped with electromagnetic flow meters to record instantaneous flow and cumulative flow.

[0038] The pretreatment module uses an automatic cleaning bar screen with a 5m mesh size, a horizontal flow sedimentation tank with a 2-hour retention time, and an equalization tank with an effective volume of 1 / 3 of the daily treatment capacity, equipped with a stirring device to prevent sedimentation.

[0039] The biological treatment unit of the advanced treatment module adopts the A / O process with a hydraulic retention time of 8 hours. The membrane filtration unit adopts a combination of hollow fiber ultrafiltration membrane and spiral wound reverse osmosis membrane. The pore size of the ultrafiltration membrane is 0.01μm and the reverse osmosis membrane rejection rate is ≥98%. The advanced oxidation unit adopts the UV / H2O2 process.

[0040] The water quality monitoring module is equipped with monitoring sensors at the outlet of the equalization tank, the outlet of the biological treatment unit, the outlet of the membrane filtration unit, and the reuse point. The sampling frequency is 1 time / minute, and the data is transmitted wirelessly to the intelligent control module via LoRa.

[0041] The intelligent control module uses a Siemens S7-1200 PLC controller and adjusts parameters based on a fuzzy PID algorithm. When the COD value is 10% higher than the set threshold, the aeration rate is automatically increased by 15%; when the turbidity exceeds the standard, the amount of coagulant added is increased.

[0042] The effective volume of the clean water storage tank in the reuse and distribution module is 50m³. 3 It is equipped with three variable frequency water pumps respectively for domestic miscellaneous use, greening irrigation and industrial recycling pipeline network. The recycling pipeline network adopts UPVC pipes and the terminal is equipped with an online water quality monitoring instrument, which automatically cuts off the water supply when the standard is exceeded.

[0043] The sludge thickening tank of the sludge treatment module adopts gravity thickening with a thickening time of 24 hours. The sludge dewatering machine adopts plate and frame filter press, and the sludge moisture content after dewatering is ≤80%. The composting device adopts aerobic composting process with a composting cycle of 20 days.

[0044] The reagent management module is equipped with three reagent storage tanks: PAC, PAM, and sodium hypochlorite, each with a volume of 5m3. A metering diaphragm pump is used for dosing, and the dosing accuracy is controlled within ±2%. A reagent concentration sensor monitors the reagent concentration in real time, and an audible and visual alarm prompts replenishment when the liquid level is low.

[0045] The wastewater collection module includes a domestic sewage collection network, an industrial wastewater collection network, and an initial rainwater collection device. It achieves the separate collection of different types of wastewater through intelligent valve control, uses corrosion-resistant pipes for transportation, and is equipped with a flow metering device to record the wastewater transport volume in real time.

[0046] The pretreatment module includes a bar screen filter, a sedimentation tank, and an equalization tank. The bar screen filter removes large suspended solids and floating matter from the wastewater. The sedimentation tank removes inorganic particles such as silt from the water through gravity settling. The equalization tank equalizes and regulates the quantity and quality of the wastewater.

[0047] The advanced treatment module includes a biological treatment unit, a membrane filtration unit, and an advanced oxidation unit. The biological treatment unit uses microorganisms to degrade organic pollutants in wastewater. The membrane filtration unit uses a combination of ultrafiltration and reverse osmosis processes to remove fine impurities and dissolved salts from the water. The advanced oxidation unit removes recalcitrant organic pollutants through the action of oxidants.

[0048] The water quality monitoring module includes a pH sensor, a dissolved oxygen sensor, a turbidity sensor, a COD sensor, and an ammonia nitrogen sensor. It collects water quality data from each treatment stage in real time and transmits the data to the intelligent control module wirelessly.

[0049] The intelligent control module is based on a PLC control system and a fuzzy control algorithm. According to the data transmitted by the water quality monitoring module, it automatically adjusts parameters such as the sludge discharge cycle of the pretreatment module, the aeration rate of the deep treatment module, the operating pressure of the membrane module, and the dosage of chemicals, so as to achieve dynamic optimization of the treatment process.

[0050] The reuse and distribution module includes a clean water storage tank, a variable frequency water pump, and a reuse pipeline network. Based on the water quality compliance status, the treated water is distributed to different reuse pathways such as domestic miscellaneous uses, greening irrigation, industrial circulating cooling, and landscape water replenishment. It is equipped with an online water quality monitoring terminal to ensure the safety of reuse.

[0051] The sludge treatment module includes a sludge thickening tank, a sludge dewatering machine, and a sludge resource utilization device. The sludge thickening tank reduces the water content of the sludge, the sludge dewatering machine further dewaters the sludge through plate and frame filter press or centrifugation, and the sludge resource utilization device composts the dewatered sludge or prepares biomass fuel.

[0052] The pharmaceutical management module includes a pharmaceutical storage tank, an intelligent metering and dosing pump, and a pharmaceutical concentration detection device. It accurately adds coagulants, flocculants, disinfectants, and other pharmaceuticals according to the instructions of the intelligent control module, monitors the amount of pharmaceuticals stored in real time, and issues a replenishment warning when the liquid level is low.

[0053] A wastewater reuse system includes the following steps:

[0054] Step 1, System Start-up and Parameter Setting: The operator initializes the system through the touch screen of the intelligent control module, sets the bar screen operation cycle to 2 hours / time, the sedimentation tank sludge discharge cycle to 8 hours / time, the biological treatment unit DO to be controlled at 2-3 mg / L, the reverse osmosis membrane operating pressure to 1.2 MPa, the domestic miscellaneous waste reuse ratio to 40%, greening irrigation to 30%, and industrial circulation to 30%, and the reagent dosage benchmark is set according to the initial water quality test value;

[0055] Step 2, Sewage Collection and Transportation: Domestic sewage is collected through the community pipe network, industrial wastewater is pre-treated in the factory pipe network, and rainwater is collected in the early stage and connected to the sewage collection module. The intelligent valve automatically switches the pipe network according to the water quality test, and the electromagnetic flow meter displays the instantaneous flow in real time. The data is uploaded to the control system.

[0056] Step 3, Wastewater Pretreatment: Wastewater first enters the bar screen filter to automatically remove the trapped screenings, and then enters the horizontal flow sedimentation tank. The silt and other particles settle under gravity. The bottom sludge of the sedimentation tank is periodically discharged by the sludge pump, and the supernatant enters the equalization tank. The stirring device runs continuously to homogenize the water quality and quantity.

[0057] Step 4, Advanced Wastewater Treatment: The effluent from the equalization tank enters the A / O biological treatment unit. In the aerobic section, aeration enables microorganisms to degrade organic pollutants. In the anoxic section, denitrification is carried out. Then, it enters the ultrafiltration membrane module to remove colloidal and macromolecular organic matter. Next, it passes through the reverse osmosis membrane to remove dissolved salts and small molecule pollutants. Finally, it enters the advanced oxidation unit, where UV catalysis of H2O2 generates hydroxyl radicals to remove recalcitrant organic matter.

[0058] Step 5, Water quality monitoring: pH sensor, dissolved oxygen sensor, turbidity sensor, COD sensor, and ammonia nitrogen sensor are used for real-time monitoring at the outlet of the equalization tank, the outlet of the biological treatment unit, the outlet of the membrane filtration unit, and the reuse terminal, respectively. The data is updated every minute and transmitted to the intelligent control module via a wireless module.

[0059] Step 6, Intelligent Parameter Adjustment: When the COD value at the outlet of the biological treatment unit is higher than 50 mg / L, the intelligent control module automatically increases the aeration rate by 10%; when the turbidity at the outlet of the membrane filtration unit exceeds 1 NTU, the PAC dosage is increased by 5%; when the pH value is lower than 6.5, the alkali solution dosing device is automatically turned on to adjust the pH to 7-8.

[0060] Step 7, Reuse and Distribution: The treated water enters the clean water storage tank. The variable frequency water pump automatically adjusts the flow rate according to the water demand of the reuse points. The domestic miscellaneous pipeline network delivers the water to the community toilet flushing and cleaning water points. The greening irrigation pipeline network is connected to the greening sprinkler irrigation system. The industrial circulation pipeline network delivers the water to the factory cooling system. The terminal monitoring instrument at each reuse point displays the water quality in real time. When the water quality exceeds the standard, the valve will be automatically closed and an alarm will be triggered.

[0061] Step 8, Sludge Treatment: The sludge generated in the sedimentation tank and equalization tank is transported to the sludge thickening tank through pipelines. After standing for 24 hours, the supernatant is returned to the pretreatment module. The thickened sludge is pumped into a plate and frame filter press for dewatering. The dewatered sludge cake is transported to the sludge resource utilization device for aerobic composting. The compost product is used as fertilizer for greening.

[0062] Step 9, Chemical Management: PAC, PAM, and sodium hypochlorite in the chemical storage tank are added to the pretreatment stage, membrane filtration stage, and deep treatment stage respectively via metering diaphragm pumps. The chemical concentration detection device monitors the added concentration in real time. When the liquid level in the storage tank is lower than 10%, the control system issues an audible and visual alarm and displays the chemical name, prompting the operator to replenish the chemical in time.

[0063] This invention achieves graded treatment and intelligent control of wastewater through modular design, improving wastewater treatment efficiency and water quality stability. It also enables efficient utilization of water resources through multiple reuse pathways, and reduces secondary pollution and resource waste through sludge resource utilization and precise chemical management. This provides an efficient and feasible technical solution for wastewater reuse projects.

[0064] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater reuse system, characterized in that: It includes a wastewater collection module, a pretreatment module, an advanced treatment module, a water quality monitoring module, an intelligent control module, a reuse and distribution module, a sludge treatment module, and a reagent management module; The wastewater collection module is responsible for classifying, collecting, and transporting wastewater from different sources. The pretreatment module performs preliminary purification treatment on the collected wastewater; The advanced treatment module further purifies the pretreated wastewater to improve water quality; The water quality monitoring module detects wastewater quality parameters in real time during and after the treatment process. The intelligent control module adjusts the operating parameters of each processing module based on water quality monitoring data; The reuse and distribution module distributes and transports compliant wastewater according to different uses; The sludge treatment module reduces, renders harmless, and recycles the sludge generated during wastewater treatment. The reagent management module intelligently adds and manages the inventory of chemical reagents required during the treatment process.

2. The wastewater reuse system according to claim 1, characterized in that: The wastewater collection module includes a domestic wastewater collection network, an industrial wastewater collection network, and an initial rainwater collection device. It achieves the separate collection of different types of wastewater through intelligent valve control, uses corrosion-resistant pipes for transportation, and is equipped with a flow metering device to record the wastewater transport volume in real time.

3. A wastewater reuse system according to claim 1, characterized in that: The pretreatment module includes a bar screen filter, a sedimentation tank, and an equalization tank. The bar screen filter removes large suspended solids and floating matter from the wastewater. The sedimentation tank removes inorganic particles such as silt from the water through gravity settling. The equalization tank equalizes and regulates the quantity and quality of the wastewater.

4. A wastewater reuse system according to claim 1, characterized in that: The advanced treatment module includes a biological treatment unit, a membrane filtration unit, and an advanced oxidation unit. The biological treatment unit utilizes microorganisms to degrade organic pollutants in wastewater. The membrane filtration unit uses a combination of ultrafiltration and reverse osmosis processes to remove fine impurities and dissolved salts from the water. The advanced oxidation unit removes recalcitrant organic pollutants through the action of oxidants.

5. A wastewater reuse system according to claim 1, characterized in that: The water quality monitoring module includes a pH sensor, a dissolved oxygen sensor, a turbidity sensor, a COD sensor, and an ammonia nitrogen sensor. It collects water quality data from each treatment stage in real time and transmits the data to the intelligent control module wirelessly.

6. A wastewater reuse system according to claim 1, characterized in that: The intelligent control module is based on a PLC control system and a fuzzy control algorithm. According to the data transmitted by the water quality monitoring module, it automatically adjusts the sludge discharge cycle of the pretreatment module, the aeration rate of the deep treatment module, the operating pressure of the membrane module, and the dosage of chemicals to achieve dynamic optimization of the treatment process.

7. A wastewater reuse system according to claim 1, characterized in that: The reuse and distribution module includes a clean water storage tank, a variable frequency water pump, and a reuse pipeline network. Based on the water quality compliance status, the treated water is distributed to different reuse pathways such as domestic miscellaneous uses, greening irrigation, industrial circulating cooling, and landscape water replenishment. An online water quality monitoring terminal is provided to ensure the safety of reuse.

8. A wastewater reuse system according to claim 1, characterized in that: The sludge treatment module includes a sludge thickening tank, a sludge dewatering machine, and a sludge resource utilization device. The sludge thickening tank reduces the water content of the sludge, the sludge dewatering machine further dewaters the sludge through plate and frame filter press or centrifugation, and the sludge resource utilization device composts the dewatered sludge or prepares biomass fuel.

9. A wastewater reuse system according to claim 1, characterized in that: The pharmaceutical management module includes a pharmaceutical storage tank, an intelligent metering and dosing pump, and a pharmaceutical concentration detection device. It accurately adds coagulants, flocculants, and disinfectants according to the instructions of the intelligent control module, monitors the pharmaceutical storage level in real time, and issues a replenishment warning when the liquid level is low.

10. A wastewater reuse method according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1, System Start-up and Parameter Setting: Operators initialize the system through the intelligent control module, setting the initial operating parameters of each treatment module, water quality compliance thresholds, reagent dosage baselines, and reuse allocation ratio parameters; Step 2, Wastewater Collection and Transportation: The wastewater collection module collects domestic sewage, industrial wastewater, and initial runoff from rainwater through various pipe networks and devices, and then transports them to the pretreatment module after flow metering. Step 3, Wastewater Pretreatment: The pretreatment module removes large particulate impurities through bar filtration, removes inorganic particulate matter through sedimentation in the sedimentation tank, and then enters the equalization tank for water quantity and quality adjustment. Step 4, Advanced Wastewater Treatment: The pretreated wastewater enters the advanced treatment module, where it passes through a biological treatment unit to degrade organic pollutants, a membrane filtration unit to remove fine impurities, and an advanced oxidation unit to remove recalcitrant pollutants. Step 5, Water quality monitoring: The water quality monitoring module sets up monitoring points after pretreatment, at each stage of advanced treatment and at the effluent outlet to monitor water quality parameters such as pH, dissolved oxygen, turbidity, COD and ammonia nitrogen in real time and transmit them to the intelligent control module. Step 6, Intelligent Parameter Adjustment: The intelligent control module automatically adjusts the operating parameters of pretreatment sludge discharge frequency, biological treatment aeration volume, membrane filtration pressure, and reagent dosage based on the comparison results of water quality monitoring data and preset thresholds. Step 7, Reuse and Distribution: The treated water enters the reuse and distribution module and is transported to reuse points for domestic miscellaneous uses, greening irrigation, and industrial circulation through different pipelines according to the preset reuse ratio. The water quality is monitored at the reuse point terminal. Step 8, Sludge Treatment: The sludge generated during the pretreatment and advanced treatment processes is transported to the sludge treatment module, where it is concentrated, dewatered, and then subjected to resource-based treatment such as composting or biomass fuel production. Step 9, Drug Management: The drug management module accurately adds drugs according to the instructions of the intelligent control module, monitors the drug inventory in real time, and issues a replenishment prompt when the level is lower than the set value to ensure a stable drug supply.

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