Integrated denitrification device for concentrated salt wastewater

Abstract

The invention relates to the technical field of water treatment, in particular to an integrated denitrification device for concentrated salt wastewater, which is mainly used for treating inorganic nitrogen and ammonia nitrogen in wastewater. The device is divided into an upper layer part and a lower layer part, the upper layer part comprises a coagulation grid, a flocculation grid, a first sedimentation grid and a second sedimentation grid, and the lower layer part is an SBR reaction tank. By adding the coagulant and the flocculant, suspended matters and colloidal substances can be effectively removed from the upper layer part, and good conditions are provided for subsequent denitrification. And the SBR reaction tank at the lower layer has efficient denitrification performance. The device is provided with an automatic control system, operation parameters can be adjusted according to actual requirements, and stable effluent quality is guaranteed. The device is compact in structure, simple and convenient to operate, small in occupied area, low in energy consumption and capable of reducing construction cost and operation cost. And remote management and monitoring can be realized through the remote monitoring system. When the tail water reaches a certain amount, the alarm is triggered automatically, the tail water is prevented from overflowing, and the treatment efficiency is improved.

Description

Technical Field

[0001] The invention relates to an integrated denitrification device for concentrated salt wastewater, belonging to the technical field of water treatment. Background Art

[0002] With the continuous increase in industrial and urban sewage discharge, the nitrogen content in water bodies has also increased, causing serious impacts on the environment and ecosystem. In order to solve this problem, denitrification technology has become the focus of research. Traditional denitrification technologies mainly include physical, chemical and biological methods. Physical methods mainly include precipitation, filtration, etc., which have limited removal effects on high-concentration nitrogen; chemical methods mainly include oxidation-reduction, ion exchange, etc., although they have certain removal effects, they are expensive and may cause secondary pollution; biological methods remove nitrogen through the action of microorganisms, which has the advantages of low cost and good effect, but traditional biological methods require higher reaction conditions and longer reaction time. Therefore, the development of an efficient and economical integrated denitrification device has become an urgent need.

[0003] Traditional denitrification devices are usually divided into three stages: pretreatment, biological reaction and post-treatment. The pretreatment stage mainly removes suspended matter and colloidal substances to provide good conditions for subsequent biological reactions; the biological reaction stage removes nitrogen through the action of microorganisms; the post-treatment stage disinfects or further treats the effluent to meet emission standards. However, traditional denitrification devices usually have problems such as large footprint, complex operation, high energy consumption, and limited removal effect on certain specific pollutants. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an integrated denitrification device for concentrated salt wastewater, which integrates the three stages of pretreatment, biological reaction and post-treatment into one device, has the advantages of compact structure, simple operation, low energy consumption, etc., and adopts a combination of physical, biological and chemical methods for denitrification. The device uses advanced coagulation and flocculation technology to remove suspended matter and colloidal substances, conducts biological reaction through the SBR reaction tank, further removes nitrogen, and finally treats the effluent through disinfection or filtration technology. The device is also equipped with an automatic control system and a monitoring system, which can realize automatic operation and remote monitoring.

[0005] In order to solve the above technical problems, the present invention provides an integrated denitrification device for concentrated salt wastewater, which includes an upper part and a lower part, and adopts a combined denitrification process of physical, biological and chemical methods, occupies a small area, and the wastewater flows by gravity and is energy-saving. The device combines multiple treatment processes such as coagulation, flocculation, and sedimentation, and uses an SBR reaction tank for denitrification. Through careful design and optimization, the device has the advantages of high efficiency, stability, and energy saving, and can be widely used in sewage treatment projects of various scales. By optimizing the structural design and operating parameters, the denitrification efficiency and treatment effect can be improved, the construction and operation costs can be reduced, and automatic operation and remote monitoring can be achieved.

[0006] An integrated denitrification device for concentrated salt wastewater, the denitrification device includes an upper layer and a lower layer, the upper layer is divided into four grids, namely a coagulation grid, a flocculation grid, a first sedimentation grid and a second sedimentation grid. A coagulant is added to the coagulation grid, and the concentration of the coagulant is 0.2-10.0 mg / L. A flocculant is added to the flocculation grid, and the dosage of the flocculant is 0.1-1.0 mg / L. The first sedimentation grid and the second sedimentation grid are used for solid-liquid separation, and the height of the precipitate does not exceed 10 cm. Among them, the lower layer is an SBR reaction tank, and the volume of the reaction tank is 40-300m 3 The denitrification process combines physical, biological and chemical methods, which has high denitrification efficiency, small footprint, gravity-flowing wastewater and energy saving.

[0007] Among them, the four grids in the upper part are connected by pipes, and the diameter of the pipes is 100-500mm.

[0008] Among them, the dissolved oxygen concentration in the SBR reaction tank is 2-6 mg / L.

[0009] Among them, the sludge age of the SBR reaction tank is 7-21 days.

[0010] The four cells in the upper layer and the SBR reaction tank in the lower layer are connected through an electric valve, and the opening of the electric valve is adjustable.

[0011] Among them, the scheme is equipped with an automatic control system, which can adjust the operating parameters of each part, including but not limited to the concentration of coagulant, the dosage of flocculant, the flow rate of the pipeline, the dissolved oxygen concentration of the SBR reaction tank and the sludge age.

[0012] The SBR reaction tank is also equipped with sensors that monitor water quality and equipment operation status and transmit data to the controller. The sensors include turbidity sensors, pH sensors, ammonia nitrogen sensors and total nitrogen sensors.

[0013] A turbidity sensor is a sensor specifically used to measure the concentration of suspended matter in a liquid. The turbidity sensor mainly determines the turbidity of the liquid, i.e., turbidity, by measuring the amount of light penetrating or scattered in the liquid. Turbidity is caused by suspended particles in the water, which diffusely reflect or scatter the incident light. Turbidity sensors use this principle to quantitatively or qualitatively evaluate the turbidity of a liquid by measuring the intensity of scattered light or transmitted light in a specific direction.

[0014] A pH sensor is a sensor used to detect the concentration of hydrogen ions in a measured object and convert it into a corresponding usable output signal. A pH sensor usually consists of two main parts: a glass electrode and a reference electrode. The glass electrode is usually a glass ball with a special glass membrane coated on its surface that can chemically react with hydrogen ions in the solution. The reference electrode is usually a silver-silver chloride electrode, which provides a stable reference voltage for calibrating the measurement.

[0015] Ammonia nitrogen sensor is a water quality monitoring instrument specially used to monitor the concentration of ammonia nitrogen in water. The working principle of ammonia nitrogen sensor is mainly based on electrochemical reaction and changes in electrode potential. Ammonia nitrogen can be decomposed into ammonia and nitrogen in water, where ammonia is oxidized into chloride ions under the action of ammonia oxidase, and then an electrochemical reaction occurs. The electrode in the sensor is a material based on redox reaction. By measuring the change in electrode potential, the concentration of ammonia nitrogen in the water can be indirectly reflected.

[0016] The total nitrogen sensor is a water quality monitoring device specially used to detect the total nitrogen concentration in water. The total nitrogen sensor monitors the concentration of total nitrogen in water in real time through a series of precise sensors and analysis systems. Total nitrogen includes organic nitrogen, ammonia nitrogen, nitrate nitrogen and nitrite nitrogen, etc., which is an important parameter in water quality monitoring. The working principle of the total nitrogen sensor is mainly based on chemical analysis and sensing technology. By detecting the nitrogen element in the sample, the concentration of total nitrogen is calculated. It usually consists of an electrode, an ammonia nitrogen detector and a signal amplifier, which can accurately reflect the total nitrogen content in the water.

[0017] The sensors are mainly set in the SBR pool, which can understand various indicators in the SBR pool in real time.

[0018] A sludge discharge system is set at the bottom or near the bottom of the sludge zone in the SBR reaction tank.

[0019] The sludge discharge system discharges the settled sludge when necessary. These sludges may include excess sludge and aged sludge, and their discharge helps maintain the sludge concentration and activity in the reaction tank, thereby ensuring the sewage treatment effect.

[0020] The sludge discharge system includes a scraper, a sludge suction machine and a sludge discharge pump. The scraper is installed at the bottom of the sedimentation tank or clarification tank. It scrapes the precipitated sludge to the sludge collection pit or sludge discharge port through the movement of a mechanical scraper or chain, and then discharges it through a pipeline. The scraper can be a central drive type or a peripheral drive type. The appropriate type is selected according to the shape and size of the tank body. The sludge suction machine uses a vacuum pump or other suction device to generate negative pressure to suck the precipitated sludge into the pipeline and discharge it. It can be moved at different positions in the sedimentation tank to ensure comprehensive sludge discharge. The sludge discharge pump is used to transport sludge from the sedimentation tank or other treatment unit to subsequent treatment equipment or disposal sites. According to the characteristics and transportation requirements of the sludge, different types of sludge discharge pumps such as centrifugal pumps and screw pumps can be selected. Modern sludge discharge systems are usually equipped with automatic control systems to realize automatic control of the sludge discharge process. These systems can automatically start and stop the sludge discharge equipment according to preset time intervals, sludge levels or other parameters to improve operating efficiency and stability. At the same time, the automatic control system can also monitor and adjust the sludge discharge process in real time to ensure that the sludge discharge effect is optimal. The flow rate of the sludge discharge pump is 1-5m 3 / h, the processing capacity of the sludge discharge system is 50-500m 3 / h.

[0021] Among them, an alarm module is provided in the automatic control system, and when the water quality or equipment operation status is abnormal, the alarm module will sound an alarm.

[0022] Among them, the material of the equipment is stainless steel or fiberglass.

[0023] Among them, the energy consumption of the equipment shall not exceed 5kWh / m 3 .

[0024] The equipment is equipped with a backup power supply or energy storage device, and the capacity of the backup power supply or energy storage device is 10-80kWh.

[0025] Among them, the equipment can be remotely controlled and monitored, and the distance of remote control and monitoring does not exceed 30km.

[0026] The device is provided with a filter, and the filtering accuracy of the filter is 1-10 μm.

[0027] The mud discharge system is equipped with a mud discharge pump and a mud discharge valve. The flow rate of the mud discharge pump is 1-5m 3 / h.

[0028] The processing capacity of the equipment is 50-500m 3 / h, the equipment floor area shall not exceed 100m 2 , the device is expandable and can increase processing power by adding modules or components.

[0029] The scheme adopts a combination of physical, biological and chemical denitrification processes, which has the advantages of high denitrification efficiency, small footprint, gravity-flow of wastewater and energy saving.

[0030] The positive and progressive effects achieved by the present invention are:

[0031] (1) The integrated denitrification device of the present invention has a compact structure, is easy to operate, can realize continuous or intermittent operation, adopts an upper and lower configuration, occupies a small area, and the wastewater flows by gravity, which is energy-saving.

[0032] (2) The coagulation, flocculation and sedimentation of the upper layer can effectively remove suspended matter and colloidal substances in the water, providing good conditions for subsequent biological denitrification.

[0033] (3) The SBR reaction tank in the lower layer can efficiently remove ammonia nitrogen and has a high denitrification efficiency.

[0034] (4) Through the automatic control system, the operating parameters of each part can be adjusted according to actual needs. The automatic control system can automatically adjust the operating parameters, reduce manual intervention and operating costs, and ensure stable effluent water quality.

[0035] (5) The denitrification device of the present invention can realize automatic operation, reduce manual intervention, reduce operating costs, and does not need to use different equipment for operation, thereby reducing the operating intensity of workers.

[0036] (6) Compact structure, small footprint, can reduce construction costs,

[0037] (7) Low energy consumption, energy saving and environmental protection, efficient energy utilization design, reducing operating energy consumption, in line with the concept of green environmental protection,

[0038] (8) The denitrification process is combined with physical, biological and chemical methods, which has high denitrification efficiency and good treatment effect, and can effectively remove pollutants such as inorganic nitrogen and ammonia nitrogen; the internal structure of the device is reasonable, which effectively improves the denitrification efficiency and has good treatment effect.

[0039] (9) Simple design, low failure rate, easy to disassemble, install and repair.

[0040] (10) Convenient remote monitoring: Equipped with a remote monitoring system to facilitate remote management and monitoring.

[0041] (11) When the tail water reaches a certain amount, the alarm will be automatically triggered to prevent the tail water from overflowing, which indirectly improves the treatment efficiency.

[0042] Structural improvements to the entire solution can be considered from multiple aspects to improve its treatment efficiency, stability and economy. From the perspective of optimizing the structural reactor, it is possible to ensure that the reaction zone and the sedimentation zone are clearly separated to reduce mixing and resuspension and improve sedimentation efficiency. At the same time, an efficient mixing device, such as an agitator or an aeration device, is set up in the reaction zone to ensure that the wastewater and the denitrification agent are fully mixed and the reaction rate is increased. In the biological reaction zone, efficient biological fillers, such as fluffy ball fillers, are used to increase the biofilm attachment area and increase the biomass, thereby enhancing the denitrification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the integrated denitrification device for concentrated salt wastewater of the present invention. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0045] See also Figure 1 , the embodiment of the present invention includes:

[0046] Embodiment 1:

[0047] An integrated denitrification device includes an upper part and a lower part. The upper part is divided into four compartments, namely, a coagulation compartment, a flocculation compartment, a first sedimentation compartment, and a second sedimentation compartment. A coagulant is added to the coagulation compartment, and the concentration of the coagulant is 2.0 mg / L. A flocculant is added to the flocculation compartment, and the dosage of the flocculant is 0.5 mg / L. The first sedimentation compartment and the second sedimentation compartment are used for solid-liquid separation, and the height of the precipitate does not exceed 8 cm. The lower part is an SBR reaction tank, and the volume of the reaction tank is 200m 3 .

[0048] The four compartments of the upper part of the device are connected by a pipe with a diameter of 300mm. The inner wall of the pipe is smooth and not easy to be blocked. The dissolved oxygen concentration in the SBR reaction tank of the lower part is maintained at about 4.0mg / L to ensure a good denitrification effect. At the same time, the device is equipped with an automatic control system, which can adjust the operating parameters of each part, including the concentration of coagulant, the dosage of flocculant, the flow rate of the pipeline, etc. The sensors in the automatic control system monitor the water quality and the operating status of the equipment, and transmit the data to the controller to realize real-time monitoring and adjustment of the device.

[0049] In addition, the device is made of stainless steel, which has high corrosion resistance and strength. The energy consumption of the equipment does not exceed 3kWh / m 3, reducing operating costs. The equipment is equipped with a backup power supply or energy storage device with a capacity of 50kWh to ensure stable operation in abnormal situations such as power outages. The processing capacity of the equipment is 200m 3 / h, covers an area of ​​about 80m 2 , which can meet the needs of medium and large-scale sewage treatment.

[0050] Embodiment 2:

[0051] An integrated denitrification device and process, the device includes an upper layer and a lower layer, the upper layer is divided into four compartments, namely, a coagulation compartment, a flocculation compartment, a first sedimentation compartment, and a second sedimentation compartment. A coagulant is added to the coagulation compartment, and the concentration of the coagulant is 0.5 mg / L. A flocculant is added to the flocculation compartment, and the dosage of the flocculant is 0.2 mg / L. The first sedimentation compartment and the second sedimentation compartment are used for solid-liquid separation, and the height of the sediment does not exceed 6 cm. The lower layer is an SBR reaction tank, and the volume of the reaction tank is 120m 3 .

[0052] The four compartments of the upper part of the device are connected by a pipe with a diameter of 200mm. The pipe is lined with glass fiber reinforced plastic and has good corrosion resistance. The dissolved oxygen concentration in the SBR reaction tank of the lower part is maintained at about 3.0mg / L. The automatic control system can adjust the operating parameters of each part, including the concentration of coagulant, the dosage of flocculant, etc. The sensors in the automatic control system include turbidity sensor, pH sensor and ammonia nitrogen sensor, which can realize real-time monitoring of water quality.

[0053] The device is made of fiberglass, which is lightweight and corrosion-resistant. The energy consumption of the device does not exceed 3.5kWh / m 3 , reducing operating costs. The equipment is equipped with a backup power supply or energy storage device with a capacity of 40kWh. The processing capacity of the equipment is 150m 3 / h, covers an area of ​​about 60m 2 , suitable for small and medium-sized sewage treatment projects.

[0054] Embodiment 3:

[0055] An integrated denitrification device includes an upper part and a lower part. The upper part is divided into four compartments, namely, a coagulation compartment, a flocculation compartment, a first sedimentation compartment, and a second sedimentation compartment. A coagulant is added to the coagulation compartment, and the concentration of the coagulant is 1.0 mg / L. A flocculant is added to the flocculation compartment, and the dosage of the flocculant is 0.3 mg / L. The first sedimentation compartment and the second sedimentation compartment are used for solid-liquid separation, and the height of the sediment does not exceed 10 cm. The lower part is an SBR reaction tank, and the volume of the reaction tank is 150 m 3 .

[0056] The four compartments of the upper part of the device are connected by a pipe with a diameter of 250mm. The pipe is lined with rubber material and has good wear resistance. The dissolved oxygen concentration in the SBR reaction tank of the lower part is maintained at about 4.5mg / L to ensure a good denitrification effect. The automatic control system can adjust the operating parameters of each part, including the concentration of coagulant, the dosage of flocculant, etc. The sensors in the automatic control system include turbidity sensors, pH sensors and total nitrogen sensors, which can realize real-time monitoring of water quality and control of total nitrogen.

[0057] The device is made of carbon steel sprayed with plastic, which has high corrosion resistance and strength. The energy consumption of the equipment does not exceed 4.5kWh / m 3

[0058] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integrated denitrification device for concentrated salt wastewater, characterized in that: The denitrification device comprises an upper layer and a lower layer. The upper layer is divided into four compartments, namely a coagulation compartment, a flocculation compartment, a first sedimentation compartment and a second sedimentation compartment. The lower layer is an SBR reaction tank with a volume of 40-300m 3 .

2. The integrated denitrification device for concentrated salt wastewater according to claim 1, characterized in that: A coagulant is added to the coagulation grid, and the concentration of the coagulant is 0.2-10.0 mg / L. A flocculant is added to the flocculation grid, and the dosage of the flocculant is 0.1-1.0 mg / L. The first sedimentation grid and the second sedimentation grid are used for solid-liquid separation, and the height of the sediment does not exceed 10 cm.

3. The integrated denitrification device for concentrated salt wastewater according to claim 1, characterized in that: The four grids of the upper part are connected by pipes with a diameter of 100-500 mm.

4. The integrated denitrification device for concentrated salt wastewater according to claim 1, characterized in that: The dissolved oxygen concentration in the SBR reaction tank is 2-6 mg / L.

5. The integrated denitrification device for concentrated salt wastewater according to claim 1, characterized in that: The sludge age of the SBR reaction tank is 7-21 days.

6. The integrated denitrification device for concentrated salt wastewater according to claim 1, characterized in that: The four cells of the upper part and the SBR reaction tank of the lower part are connected through an electric valve, and the opening of the electric valve is adjustable.

7. The integrated denitrification device for concentrated salt wastewater according to claim 1, characterized in that: The SBR reaction tank is also provided with sensors, including a turbidity sensor, a pH sensor, an ammonia nitrogen sensor and a total nitrogen sensor.

8. The integrated denitrification device for concentrated salt wastewater according to claim 1, characterized in that: A sludge discharge system is set at the bottom or near the bottom of the sludge area in the SBR reaction tank. The sludge discharge system includes a scraper, a sludge suction machine and a sludge pump. The scraper is installed at the bottom of the sedimentation tank or clarification tank. It scrapes the precipitated sludge to the sludge collection pit or sludge discharge port through the movement of a mechanical scraper or chain, and then discharges it through a pipe. The scraper is a central drive type or a peripheral drive type. The appropriate type is selected according to the shape and size of the tank body. The sludge suction machine uses a vacuum pump or other suction device to generate negative pressure, sucks the precipitated sludge into the pipe and discharges it, and moves at different positions in the sedimentation tank to ensure comprehensive discharge. The sludge pump is used to transport the sludge from the sedimentation tank or other treatment units to subsequent treatment equipment or disposal sites.

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