Efficient sewage treatment system

Abstract

The utility model relates to an efficient sewage treatment system. The utility model provides an efficient sewage treatment system aiming at the problems of small water treatment amount and relatively high running cost per ton of water in the current small sewage treatment plant. The efficient sewage treatment system comprises a grating water inlet well, an adjusting tank, a rotational flow grit chamber, an anoxic selection tank, an efficient A2 / O biological tank, a secondary sedimentation tank, a magnetic coagulation sedimentation tank, a filter tank, a contact disinfection tank, an external reflux system, an aeration system and a sludge treatment system, and the anoxic selection tank enables sewage and reflux sludge to be fully mixed and contacted and consumes nitrate in the reflux sludge; an anaerobic environment is created for a subsequent process, and the nitrogen and phosphorus removal effect of the process is enhanced. The efficient A2 / O biological tank has a synchronous nitrification and denitrification function. The system and the process can effectively reduce medicament addition and equipment power consumption, and have remarkable economic benefits.

Description

Technical Field

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

[0002] Small sewage treatment plants play a key role in decentralized sewage treatment, especially in less populated areas and urban suburbs, where they can effectively treat local sewage and reduce environmental pollution and ecological damage. However, small sewage treatment plants often require more complex processes and higher treatment costs to meet discharge standards due to their small water intake, high nitrogen and phosphorus influent, and unstable influent water quality. With the deepening of ecological civilization construction, the water quality requirements of urban water bodies are constantly increasing, and the discharge standards of sewage treatment plants are also increasing. Small sewage treatment plants have relatively high operating costs per ton of water due to their small water treatment volume. Raising standards will significantly increase power consumption and labor costs. At the same time, in order to meet the removal requirements of indicators such as total nitrogen and total phosphorus, it is necessary to increase the dosage of carbon sources and other agents, which greatly increases the operating costs of small domestic sewage treatment plants and increases the difficulty of operation.

[0003] In view of the problems existing in current small-scale sewage treatment plants, this application proposes an efficient sewage treatment system. Summary of the invention

[0004] (I) Purpose of the utility model: To solve the problems of small-scale sewage treatment plants existing in the background technology, the utility model proposes an efficient sewage treatment system, which effectively improves the nitrogen and phosphorus removal rate and realizes efficient and stable operation of small-scale sewage treatment plants.

[0005] (II) The technical scheme is as follows: The high-efficiency sewage treatment system includes a screen water inlet well, a regulating tank, a cyclone sand settling tank, an anoxic selection tank, a high-efficiency A 2 / O biological pool, secondary sedimentation tank, magnetic coagulation sedimentation tank, filter tank, contact disinfection tank, external return system, aeration system, sludge treatment system, the front end of the grille water inlet well is connected to the water inlet pipeline, the rear end of the grille water inlet well is connected to the regulating tank, the rear end of the regulating tank is connected to the cyclone sand settling tank, the rear end of the cyclone sand settling tank is connected in parallel to the anoxic selection tank and the high-efficiency A 2 / O biological pool, the anoxic selection pool is connected to a high-efficiency A 2 / O biological pool, the efficient A 2 The rear end of the / O biological pool is connected to the secondary sedimentation tank, and the rear end of the secondary sedimentation tank is connected to the magnetic coagulation sedimentation tank, the external return system and the sludge treatment system. The effluent from the secondary sedimentation tank enters the magnetic coagulation sedimentation tank, the external return sludge enters the anoxic selection tank through the external return system, and the remaining sludge is discharged through the sludge treatment system. The effluent from the magnetic coagulation sedimentation tank enters the filter tank and the contact disinfection tank in sequence, and the rear end of the magnetic coagulation sedimentation tank is connected to the sludge treatment system.

[0006] Furthermore, the screen water inlet well is divided into two parts, a front part and a rear part. A coarse screen is installed in the first part to intercept and remove coarse suspended matter and impurities in the sewage, and a fine screen is installed in the second part to intercept and remove fine impurities between 4-10mm.

[0007] Furthermore, the hydraulic retention time of the regulating tank is 4h-6h, and a submersible agitator and a lifting pump are installed at the bottom of the tank body. The lifting pump is connected to the cyclone sand settling tank through a sewage pipe to efficiently remove sand and other particulates in the sewage.

[0008] Furthermore, the effluent from the cyclone sedimentation tank enters the anoxic selection tank and the high-efficiency A 2 / O biological pool, the sewage volume entering the anoxic selection pool accounts for 10%-15% of the total water volume, and the sewage volume entering the high-efficiency A 2 / O The wastewater volume of the biological pool accounts for 90%-85% of the total water volume, ensuring that there is a sufficient amount of easily degradable organic matter to enter the subsequent process.

[0009] Furthermore, part of the sludge discharged from the secondary sedimentation tank is external return sludge, and part is residual sludge. The external return sludge all enters the anoxic selection tank through the external return system, and the return ratio is 80%-100%, ensuring a high nitrate environment in the anoxic selection tank. Less sewage causes the microorganisms in the return sludge to compete fiercely for nutrients, thereby achieving the purpose of inhibiting the growth of filamentous bacteria and selecting dominant bacterial flocs.

[0010] Furthermore, the hydraulic retention time of the anoxic selection tank is 20 minutes to 30 minutes, and an agitator is installed at the bottom of the tank to allow the sewage and the return sludge to be fully mixed and contacted, consume the nitrate in the return sludge, create an anaerobic environment for subsequent processes, and enhance the nitrogen and phosphorus removal effects of the process.

[0011] Furthermore, the highly efficient A 2 / O biological pool includes anaerobic pool, anoxic pool and high-efficiency aerobic pool. Agitators are installed at the bottom of the anaerobic pool and the anoxic pool. The high-efficiency aerobic pool is provided with an aeration system and suspended filler. The suspended filler is an obliquely suspended porous suspended filler or a suspended ball filler. The addition ratio of the suspended filler is 30%-40% of the volume of the high-efficiency aerobic pool, so that the high-efficiency aerobic pool has the function of simultaneous nitrification and denitrification. An internal reflux pump is installed at the end of the high-efficiency aerobic pool. The internal reflux pump is connected to the anoxic pool through a pipeline to realize denitrification reflux. The internal reflux pump is a variable frequency pump, and the internal reflux ratio can be adjusted according to process requirements.

[0012] Furthermore, the secondary sedimentation tank is a horizontal flow sedimentation tank, and a reagent dosing device is provided at the end of the secondary sedimentation tank, and the reagent dosing device can dosing PAC, FeCl 3 And other phosphorus removal agents react with dissolved phosphate in water to form insoluble phosphate precipitates.

[0013] Furthermore, the filter tank adopts one of a sand filter tank, a filter cloth filter tank, and a fiber rotary filter tank, which is simple to manage and maintain and has low operating costs.

[0014] The above technical scheme of the utility model has the following beneficial technical effects: the process realizes the homogenization and efficient treatment of unstable influent of small sewage treatment plants, the anoxic selection tank utilizes the advantages of bacterial flocs in sludge in a nitrate environment over filamentous bacteria, and achieves the purpose of increasing the proportion of bacterial flocs and inhibiting the growth of filamentous bacteria, while consuming nitrate in the return sludge to provide efficient A 2 / O biological pool provides anaerobic environment, improves the treatment efficiency of subsequent processes, and thus greatly improves the removal efficiency of pollutants. The high-efficiency aerobic pool adopts simultaneous nitrification and denitrification process to reduce the total nitrogen in the effluent and reduce the external carbon source. 2 The / O process can achieve stable operation when the influent water volume and water quality are unstable. Under the same discharge standard, it can effectively reduce the dosage of chemicals and the power consumption of equipment, and has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a process flow chart of the utility model.

[0016] Figure 2 This utility model is highly efficient A 2 / O biological pool process diagram. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiment of the utility model is further described in detail below in combination with the specific implementation mode of the utility model and with reference to the accompanying drawings. It should be understood that the described embodiments are only exemplary and are not intended to limit the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the utility model.

[0018] like Figure 1 As shown, the utility model proposes an efficient sewage treatment system, and the specific steps are as follows:

[0019] 1) Domestic sewage flows through the screen inlet well, and large particles, suspended matter, hair, etc. are removed through the screen;

[0020] 2) The water from the screen inlet well enters the regulating tank, and a submersible agitator is installed in the regulating tank to prevent sludge deposition;

[0021] 3) The effluent from the regulating tank is pumped into the cyclone sand settling tank to remove sand and other particles;

[0022] 4) The effluent from the cyclone grit chamber is divided into two parts: 15% enters the anoxic selection tank to select the dominant bacterial flocs, and 85% enters the high-efficiency A 2 / O biological pool;

[0023] 5) The effluent from the anoxic selection pool enters the high-efficiency A 2 / O biological pool carries out biochemical reaction to remove pollutants such as COD, ammonia nitrogen, phosphorus, etc. in sewage;

[0024] 6) Efficient A 2 / O The effluent from the biological pool enters the secondary sedimentation tank for mud-water separation, and part of the sludge is returned to the anoxic selection tank through the external return system;

[0025] 7) A reagent dosing device is installed at the end of the secondary sedimentation tank to add phosphorus removal reagents to react with dissolved phosphates in the water to form insoluble phosphate precipitates;

[0026] 8) The effluent from the secondary sedimentation tank enters the magnetic coagulation sedimentation tank to effectively remove the residual SS and some insoluble organic matter in the wastewater;

[0027] 9) The effluent from the magnetic coagulation sedimentation tank enters the sand filter tank to intercept tiny suspended solids in the water to ensure that the effluent is stable and meets the standards;

[0028] 10) The effluent from the sand filter tank enters the contact disinfection tank for disinfection to kill harmful pathogenic microorganisms;

[0029] 11) The effluent from the contact disinfection tank meets the discharge standards;

[0030] 12) The residual sludge from the secondary sedimentation tank and magnetic coagulation sedimentation tank is discharged into the sludge treatment system for harmless treatment.

[0031] like Figure 2 As shown, efficient A 2 / O biological pool includes anaerobic pool, anoxic pool and high-efficiency aerobic pool. Agitators are provided in the anaerobic pool and the anoxic pool. Aeration device and suspended ball filler are provided in the high-efficiency aerobic pool. The mud-water mixture in the high-efficiency aerobic pool is returned to the anoxic pool for denitrification and nitrogen removal. The internal reflow ratio can be adjusted according to the actual operation conditions.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] The above is only a preferred specific implementation of the utility model, which is only used to illustrate or explain the principle of the utility model, and does not limit the application form of the utility model. Any modification, equivalent replacement, improvement, etc. made according to the technical solution of the utility model shall be included in the protection scope of the utility model.

Claims

1. An efficient sewage treatment system, characterized in that: Including screen water well, regulating tank, cyclone sand settling tank, anoxic selection tank, high efficiency A 2 / O biological pool, secondary sedimentation tank, magnetic coagulation sedimentation tank, filter tank, contact disinfection tank, external return system, aeration system, sludge treatment system, the front end of the grille water inlet well is connected to the water inlet pipeline, the rear end of the grille water inlet well is connected to the regulating tank, the rear end of the regulating tank is connected to the cyclone sand settling tank, the rear end of the cyclone sand settling tank is connected in parallel to the anoxic selection tank and the high-efficiency A through a sewage pipe 2 / O biological pool, the anoxic selection pool is connected to a high-efficiency A 2 / O biological pool, the efficient A 2 The rear end of the / O biological pool is connected to the secondary sedimentation tank, and the rear end of the secondary sedimentation tank is connected to the magnetic coagulation sedimentation tank, the external return system and the sludge treatment system. The effluent enters the magnetic coagulation sedimentation tank, the external return sludge enters the anoxic selection tank through the external return system, and the remaining sludge is discharged through the sludge treatment system. The effluent from the magnetic coagulation sedimentation tank enters the filter tank and the contact disinfection tank in sequence, and the rear end of the magnetic coagulation sedimentation tank is connected to the sludge treatment system.

2. A high-efficiency sewage treatment system according to claim 1, characterized in that: The highly efficient A 2 / O biological pool includes anaerobic pool, anoxic pool and high-efficiency aerobic pool. Agitators are installed at the bottom of the anaerobic pool and the anoxic pool. The high-efficiency aerobic pool is provided with an aeration system and suspended filler. The suspended filler is an obliquely suspended porous suspended filler or a suspended ball filler. The addition ratio of the suspended filler is 30%-40% of the volume of the high-efficiency aerobic pool. An internal reflux pump is installed at the end of the high-efficiency aerobic pool. The internal reflux pump is connected to the anoxic pool through a pipeline. The internal reflux pump is a variable frequency pump, and the internal reflux ratio can be adjusted according to process requirements.

3. The high-efficiency sewage treatment system according to claim 1 is characterized in that: The screen water inlet well is divided into two parts, front and back. A coarse screen is installed in the first part to intercept and remove coarse suspended matter and impurities in sewage, and a fine screen is installed in the second part to intercept and remove fine impurities between 4 and 10 mm.

4. The high-efficiency sewage treatment system according to claim 1 is characterized in that: The effluent from the cyclone grit chamber enters the anoxic selection tank and the high-efficiency A 2 / O biological pool, the sewage volume entering the anoxic selection pool accounts for 10%-15% of the total water volume, and the sewage volume entering the high-efficiency A 2 / O The sewage volume of the biological pool accounts for 90%-85% of the total water volume.

5. The high-efficiency sewage treatment system according to claim 1 is characterized in that: The secondary sedimentation tank is a horizontal flow sedimentation tank, and a reagent dosing device is arranged at the end of the secondary sedimentation tank. The reagent dosing device can add PAC, FeCl3 and other phosphorus removal agents to react with dissolved phosphate radicals in water to generate insoluble phosphate precipitates.

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