Efficient wastewater air flotation system

Abstract

The utility model discloses an efficient wastewater air flotation system which comprises a reaction sedimentation tank, an aeration device, a water inlet dosing device and a slag scraping device, a mud bucket is arranged at the bottom of the reaction sedimentation tank; a mud outlet is formed in the bottom of the mud bucket; the aeration device comprises a clean water tank, a dissolved air water pump, a dissolved air tank, a releaser and a pressure reducing valve which are sequentially communicated through a pipeline, the pressure reducing valve is communicated with an air-water outlet of the aeration device, and the releaser and the air-water outlet of the aeration device are located in the mud bucket; the front end of the dissolved air water pump communicates with an ozone generator; the water inlet dosing device comprises a baffling type dosing pipeline, and the dosing pipeline is used for performing dosing coagulation and pH regulation on wastewater to be treated; the dosing pipeline is positioned in the reaction sedimentation tank, an inlet of the dosing pipeline is communicated with the wastewater inlet pipe, and an outlet of the dosing pipeline is arranged in the mud bucket; the slag scraping device is positioned at the top of the reaction sedimentation tank and is used for scraping suspended matters after air floatation out of the reaction sedimentation tank. The efficient wastewater air flotation system is high in air flotation efficiency, small in occupied area and light in overall weight.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a high-efficiency wastewater flotation system. Background Art

[0002] In recent years, flotation technology has been widely used in water supply and drainage and wastewater treatment. It can effectively remove the light floating flocs that are difficult to settle in wastewater. Dissolved air flotation machines are suitable for papermaking wastewater treatment and fiber recovery, printing and dyeing wastewater treatment, electroplating and other wastewater treatment containing various heavy metal ions and oily wastewater. The dissolved air system of the flotation machine produces a large number of micro-nano bubbles in the water, so that the air is attached to the suspended particles in the form of highly dispersed nano bubbles, resulting in a state with a density less than that of water. The buoyancy principle is used to make it float on the water surface, thereby realizing the water treatment equipment of solid-liquid separation.

[0003] Usually the flotation machine includes a water pump, an air compressor, an air dissolving tank, a mixer, a stirring reaction area, a sedimentation area, and a dosing area.

[0004] For example, a Chinese patent document with publication number CN219058741U discloses a flotation filtration device for high-concentration wastewater, which includes a coagulation stirring tank, a flocculation stirring tank, an aeration filter tank and a sludge tank in order according to the wastewater treatment flow direction; the coagulation stirring tank inputs the wastewater to be treated through the wastewater inlet pipe, and is used to perform coagulation, dosing and pH adjustment stirring on the wastewater; the flocculation stirring tank is used to perform flocculation, dosing and stirring on the wastewater; a flotation aerator, a ceramic membrane filter and a scraper are installed in the aeration filter tank, wherein the flotation aerator is used to generate tiny bubbles that combine with the sludge in the wastewater in the aeration filter tank to generate flotation, and the ceramic membrane filter is used to filter and absorb suspended matter in the aeration filter tank; and the effluent filtered by the ceramic membrane filter is pumped out and discharged through an outlet pump arranged outside the aeration filter tank.

[0005] The air flotation machine currently used has a low efficiency in generating bubbles in water, resulting in poor solid-liquid separation of sewage, and the uneven stirring in the stirring zone leads to insignificant mud-water separation, resulting in poor sewage purification effect and poor practicality. In addition, the existence of the stirring zone makes the entire equipment larger in size, and the pump, air compressor and dissolved air tank make the entire system bulky.

[0006] In summary, the current air flotation machines have great inconveniences and defects and need to be improved. Utility Model Content

[0007] The utility model provides a high-efficiency wastewater flotation system, which has high flotation efficiency, small floor space and light overall equipment weight.

[0008] The utility model provides the following technical solutions:

[0009] An efficient wastewater flotation system, comprising a reaction sedimentation tank, an aeration device, a water inlet and dosing device, and a slag scraping device;

[0010] A clean water inlet is provided at the top of the reaction sedimentation tank, a mud hopper is provided at the bottom of the reaction sedimentation tank, and a mud discharge outlet is provided at the bottom of the mud hopper;

[0011] The aeration device comprises a clean water tank, a dissolved air water pump, a dissolved air tank, a releaser, and a pressure reducing valve which are sequentially connected through pipelines. The pressure reducing valve is connected to the air and water outlet of the aeration device. The releaser and the air and water outlet of the aeration device are located in the mud bucket. The front end of the dissolved air water pump is connected to an ozone generator.

[0012] The water inlet dosing device includes a dosing pipeline arranged in a baffled manner, and the dosing pipeline is used to perform dosing coagulation and pH adjustment on the wastewater to be treated; the dosing pipeline is located in the reaction sedimentation tank, the inlet of the dosing pipeline is connected to the wastewater inlet pipe, and the outlet of the dosing pipeline is arranged in the mud hopper;

[0013] The scraping device is located at the top of the reaction sedimentation tank and is used to scrape the suspended matter out of the reaction sedimentation tank after flotation.

[0014] The wastewater to be treated enters the dosing pipeline and undergoes dosing coagulation and pH adjustment, and then enters the reaction sedimentation tank from the outlet located in the mud hopper. After passing through the air dissolving pump, air dissolving tank, releaser, and pressure reducing valve, the gas-water forms micro-nano bubbles and enters the mud hopper. Under the action of the micro-nano bubbles, the mud water forms a flotation phenomenon, and the suspended particles and grease rise to the liquid surface and are scraped out of the reaction sedimentation tank by the scraping device. The sludge sinks into the mud hopper and is discharged from the mud discharge port. The clean water after flotation is discharged from the clean water port at the top of the reaction sedimentation tank.

[0015] The pump head of the air dissolving water pump is made of at least one of 316L stainless steel, polytetrafluoroethylene and glass fiber reinforced plastic. The material of the air dissolving tank is at least one of 304, 316 and 316L stainless steel; and a vent valve is arranged on the top of the air dissolving tank.

[0016] The ozone generator is an air source and has a gas tank for storing ozone; the ozone generator is made of aluminum-magnesium-titanium alloy material; the power supply voltage of the ozone generator is 220V and the current is 10A.

[0017] Preferably, the reaction sedimentation tank is provided with inclined tubes and / or baffles which are arranged obliquely. The inclined tubes and / or baffles which are arranged obliquely can improve the sedimentation effect of mud and water.

[0018] The material of the inclined tube or the partition is polytetrafluoroethylene plastic.

[0019] Preferably, a dosing pump and a pH meter are provided at the inlet of the dosing pipeline; the dosing pump is linked with the pH meter, and the pH meter is used to monitor the pH value of the wastewater to be treated in real time. When the value measured by the pH meter exceeds a threshold value, the dosing pump automatically adjusts the dosing.

[0020] The dosing pump is an electromagnetic diaphragm metering pump that can effectively control the amount of dosing. The linkage between the dosing pump and the pH meter allows dosing to be automatic without the need for personnel on duty.

[0021] The scraping device has a scraping plate, on which a brush is arranged, which can scrape off the adhesive substances in the waste water.

[0022] Preferably, the high-efficiency wastewater flotation system also includes a PLC controller, which is used to monitor the inlet and outlet flow rates, pH value, dosage, gas flow rate and gas flow of the high-efficiency wastewater flotation system in real time, and to alarm when the monitoring value exceeds the threshold.

[0023] Further preferably, the PLC controller monitors the operating status of each component in the high-efficiency wastewater flotation system in real time and controls the start and stop of each component, and issues an alarm and shuts down the system when the operating status of a component is abnormal.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] (1) Adding ozone to the aeration gas can improve the removal of organic matter on the basis of flotation grease removal, and also play a role in sterilization and disinfection;

[0026] (2) The utility model adopts a dissolved air water pump, a dissolved air tank, a releaser and a pressure reducing valve connected to each other, which not only saves the floor space of the entire equipment, but also reduces the weight of the equipment. The releaser and the pressure reducing valve are used at the same time to increase the number of micro-nano bubbles and improve the flotation efficiency;

[0027] (3) The water inlet dosing device uses the water flow velocity to make the reagents mix evenly. The dosing pipeline is designed as a baffle type to increase the contact area between the reagents and the wastewater, reduce the stirring reaction area, and save floor space and cost;

[0028] (4) The gas-water outlet and the dosing pipe outlet are located in the mud hopper. The mud and water are more easily separated from the solid and liquid under the action of micro-nano bubbles, thereby improving the efficiency of solid-liquid separation and scum removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of a high-efficiency wastewater flotation system. DETAILED DESCRIPTION

[0030] In order to further illustrate the technical means and effects adopted by the utility model, the high-efficiency wastewater flotation system of the utility model is further described in detail below in conjunction with the preferred embodiments and the accompanying drawings.

[0031] like Figure 1As shown, the whole high-efficiency wastewater flotation system includes the main equipment such as ozone generator 1, PLC system 2, dissolved air water pump 3, dissolved air tank 4, reaction sedimentation tank 5, mixing dosing pipe 6, dosing pump 7, scraper 8, slag hopper 9, water inlet pump 10, etc.

[0032] The air outlet of the ozone generator 1 is connected to a gas flow meter and an air inlet valve; the water inlet of the dissolved air pump 3 is connected to the bottom of the clean water tank, and is also connected to a regulating valve and a flow meter, and the air inlet of the dissolved air pump 3 is connected to the outlet of the air inlet valve; the outlet of the dissolved air pump 3 is directly connected to the upper end of the dissolved air tank 4, and a pressure gauge and an air release valve are provided on the upper end of the dissolved air tank 4; the outlet of the dissolved air tank 4 is connected to a releaser 11 and a pressure reducing valve 12, and is also connected to the air and water inlet of the reaction sedimentation tank 5, and the air and water inlet is designed at the upper end of the mud bucket 51. The ozone generator 1 is added to improve the efficiency of flotation to remove organic matter. Only the dissolved air pump 3 and the dissolved air tank 4 are connected to reduce the weight and floor space of the flotation machine. The releaser 11 and the pressure reducing valve 12 are used at the same time to increase the number of flotation bubbles, reduce the particle size of the bubbles, and improve the flotation effect. The air-water inlet and the outlet of the mixed dosing pipe are arranged on the mud bucket. Under the action of micro-nano bubbles, the mud water improves the solid-liquid separation of sewage, improves the removal rate of scum, and improves practicality.

[0033] An inlet valve is arranged at the front end of the inlet pump 10, and the outlet of the inlet pump 10 is connected to the right end inlet of the mixing and dosing tube 6. The dosing port of the dosing pump 7 and the insertion port of the pH meter 13 are designed on the mixing and dosing tube 6. The dosing pump 7 is linked to the pH meter 13. When the pH of the water quality exceeds the set value, the dosing pump 7 will automatically dosing, which is convenient for dosing. The mixing and dosing tube 6 is designed as a baffle type, which can make the wastewater and the agent fully contact and react, improve the reaction efficiency of the agent, and also reduce the stirring area and the mixer to avoid the problem of uneven stirring.

[0034] An inclined pipe 14 is arranged in the reaction sedimentation tank 5, a scraper 8 is arranged at the upper end of the reaction sedimentation tank 5, and a scraper plate is arranged on the scraper. The inclined pipe 14 can fully separate the mud and water, and the scraper plate removes the floating oil residue, thereby improving practicality.

[0035] The whole device is designed with a PLC system 2. The PLC system 2 is designed to start and stop the ozone generator 1, the dissolved air pump 3, the water inlet pump 10, the dosing pump 7 and the pH meter 13 respectively, and monitor them at all times. An alarm button is also designed to link the main equipment. When any equipment is short-circuited or idling, the whole equipment will alarm and stop operating to avoid major dangers when the equipment is idling and protect the normal operation of the equipment.

[0036] The above description is only an example of a preferred implementation of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency wastewater flotation system, characterized in that: It includes reaction sedimentation tank, aeration device, water inlet and dosing device, and scraping device; A clean water inlet is provided at the top of the reaction sedimentation tank, a mud hopper is provided at the bottom of the reaction sedimentation tank, and a mud discharge outlet is provided at the bottom of the mud hopper; The aeration device comprises a clean water tank, a dissolved air water pump, a dissolved air tank, a releaser, and a pressure reducing valve which are sequentially connected through pipelines. The pressure reducing valve is connected to the air and water outlet of the aeration device. The releaser and the air and water outlet of the aeration device are located in the mud bucket. The front end of the dissolved air water pump is connected to an ozone generator. The water inlet dosing device includes a dosing pipeline arranged in a baffled manner, and the dosing pipeline is used to perform dosing coagulation and pH adjustment on the wastewater to be treated; the dosing pipeline is located in the reaction sedimentation tank, the inlet of the dosing pipeline is connected to the wastewater inlet pipe, and the outlet of the dosing pipeline is arranged in the mud hopper; The scraping device is located at the top of the reaction sedimentation tank and is used to scrape the suspended matter out of the reaction sedimentation tank after flotation.

2. The high-efficiency wastewater flotation system according to claim 1 is characterized in that: The pump head of the air-dissolving water pump is made of 316L stainless steel, polytetrafluoroethylene or glass fiber reinforced plastic; the material of the air-dissolving tank is one of 304, 316 and 316L stainless steel.

3. The high-efficiency wastewater flotation system according to claim 1 is characterized in that: The reaction sedimentation tank is provided with inclined tubes and / or partitions which are arranged obliquely.

4. The high-efficiency wastewater flotation system according to claim 3 is characterized in that: The material of the inclined tube or the partition is polytetrafluoroethylene plastic.

5. The high-efficiency wastewater flotation system according to claim 1 is characterized in that: A dosing pump and a pH meter are provided at the inlet of the dosing pipeline; the dosing pump is linked with the pH meter, and the pH meter is used to monitor the pH value of the wastewater to be treated in real time. When the measured value of the pH meter exceeds the threshold, the dosing pump automatically adjusts the dosing.

6. The high-efficiency wastewater flotation system according to claim 1, characterized in that: The high-efficiency wastewater flotation system also includes a PLC controller, which is used to monitor the inlet and outlet flow rates, pH value, dosage, gas flow rate and gas flow of the high-efficiency wastewater flotation system in real time, and to alarm when the monitoring value exceeds the threshold.

7. The high-efficiency wastewater flotation system according to claim 6, characterized in that: The PLC controller monitors the operating status of each component in the high-efficiency wastewater flotation system in real time and controls the start and stop of each component. When the operating status of a component is abnormal, an alarm is issued and the system is shut down.

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