A new type of decentralized sewage treatment equipment

Abstract

The present invention discloses a novel decentralized sewage treatment device, comprising a first modified packing area, a biological multiplication area, a second modified packing area, a third modified packing area, a blower, and a reflux pump. Incoming water flows sequentially through the first modified packing area, the biological multiplication area, the second modified packing area, and the third modified packing area. One end of the reflux pump is connected to the outlet of the third modified packing area and is used to reflux some of the outflow water. The other end of the reflux pump is connected to the water inlet of the first modified packing area. The blower is connected to the third modified packing area and is used to aerate the third modified packing area. The first modified packing area is used for denitrification, the second modified packing area is used for denitrification while intercepting suspended matter in the water, and the third modified packing area is used to convert the remaining ammonia nitrogen in the water into nitrate nitrogen. This novel decentralized sewage treatment device aims to solve the problems of existing integrated sewage treatment equipment, which require an external carbon source for denitrification, have high investment and operating costs, and are complex to operate and manage.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a novel decentralized sewage treatment device. Background Art

[0002] At present, a common technology for small-scale sewage treatment equipment on the market is MBR (Membrane Bio-Reactor) technology, but this technology has the following disadvantages:

[0003] 1. High energy consumption. In order to maintain the normal operation of the membrane system, a large amount of aeration is often required, resulting in high operating costs for the entire system;

[0004] 2. Operation and maintenance are complex and require high-quality personnel. The membrane system needs to be maintained and cleaned regularly to ensure the flux of the membrane system. Professional personnel are often required to maintain the membrane system.

[0005] 3. High investment cost. Since the investment cost of membrane system is higher than that of conventional sewage treatment methods, the investment cost of sewage treatment equipment using membrane technology is often higher than that of sewage treatment equipment using other technologies.

[0006] 4. The depreciation cost is high. The longest warranty period for MBR membranes on the market is currently 3 years, while the service life of domestic membranes is often less than 2 years, and some even need to be replaced after 1 year.

[0007] 5. The phosphorus removal effect is poor and the sludge treatment is difficult. It is often necessary to add a large amount of phosphorus removal agents, which will also bring a large amount of sludge;

[0008] 6. The cost of denitrification is high.

[0009] Other commonly used technologies for small-scale sewage treatment equipment on the market are biofilm methods. However, small-scale sewage treatment equipment using these technologies has encountered significant problems in promotion:

[0010] 1. The effluent quality is unstable. The amount of water entering the small sewage treatment system is often uneven. In some periods of time, the water volume is very large, while in other periods of time, the water volume is very small or even non-existent. This has a great impact on the sewage treatment equipment, resulting in unstable treatment effects of these equipment.

[0011] 2. Affected by seasonality, rainfall and temperature vary greatly in different seasons. When the temperature is low, the treatment effect is poor. When the rainfall is heavy, the system's ability to resist shock loads is insufficient. After the impact of rain, the system's ability to treat sewage deteriorates and requires some time to recover.

[0012] 3. It is impossible to accurately determine the time and amount of biological sludge discharge, because the reduction of pollution in sewage mainly depends on the metabolism of microorganisms, so the microorganisms are always in the process of increasing in value. When the amount of microorganisms increases to a certain level, a balance will be formed between the amount of nutrients in the sewage and the number of microorganisms. If the number of microorganisms continues to increase without discharging this part of the sludge, the nutrients in the sewage will not be enough to support their reproduction, and the microorganisms will enter the endogenous digestion stage; the first thing to be digested and absorbed is the flocculent group, and the sedimentation of the biological sludge will deteriorate. Therefore, a lot of biological sludge will flow out of the system with the produced water, causing the water quality of the effluent to deteriorate; conversely, when the amount of biological sludge discharged from the system is too much, some of the pollutants in the sewage will not be consumed, which also causes the water quality of the effluent to deteriorate;

[0013] 4. The effect of removing ammonia nitrogen and total nitrogen is poor. Nitrifying bacteria are autotrophic bacteria and their growth rate is slow. When the system is unstable, it is difficult to form agglomeration of nitrifying bacteria, resulting in poor effect of removing ammonia nitrogen and total nitrogen.

[0014] In view of this, those skilled in the art urgently need to provide a new type of decentralized sewage treatment equipment to solve the above problems. Summary of the Invention

[0015] (1) Technical issues to be solved

[0016] The technical problem solved by the present invention is that the existing integrated sewage treatment equipment requires an external carbon source for denitrification, has high investment and operation costs, and is complex to operate and manage.

[0017] (2) Technical solution

[0018] The present invention provides a novel decentralized sewage treatment equipment, comprising a first modified filler area, a biological multiplication area, a second modified filler area, a third modified filler area, a blower and a reflux pump; incoming water flows through the first modified filler area, the biological multiplication area, the second modified filler area and the third modified filler area in sequence; one end of the reflux pump is connected to the water outlet of the third modified filler area and is used to reflux part of the outflow water, and the other end of the reflux pump is connected to the water inlet of the first modified filler area; the blower is connected to the third modified filler area and is used to aerate the third modified filler area; the first modified filler area is used for denitrification treatment, the biological multiplication area is used for anaerobic ammonia oxidation reaction and phosphorus removal, the second modified filler area is used for denitrification while intercepting suspended matter in the water, and the third modified filler area is used to convert the remaining ammonia nitrogen in the water into nitrate nitrogen.

[0019] Furthermore, the first modified filler area is filled with a first modified filler, the second modified filler area is filled with a second modified filler, and the third modified filler area is filled with a third modified filler. The first modified filler is a suspended filler, and the second and third modified fillers are stacked fillers.

[0020] Furthermore, the first modified filler is a suspended particle with wrinkles on the surface.

[0021] Furthermore, the particle size of the second modified filler is larger than the diameter of the third modified filler.

[0022] Furthermore, the second modified filler is a processed mineral filler.

[0023] Furthermore, the third modified filler is a processed mineral filler.

[0024] Furthermore, the biological multiplication zone is connected to the second modified filler zone through a diversion well, one end of the diversion well is connected to the upper end of the biological multiplication zone, and the other end of the diversion well is connected to the lower end of the second modified filler zone.

[0025] Furthermore, the second modified filler area is connected to the third modified filler area through a connecting pipe, one end of the connecting pipe is connected to the upper end of the second modified filler area, and the other end of the connecting pipe is connected to the lower end of the third modified filler area.

[0026] Furthermore, the water outlet of the third modified filler zone is arranged at its upper end.

[0027] Furthermore, the blower is arranged at the lower end of the third modified filler area.

[0028] (3) Beneficial effects

[0029] The novel decentralized sewage treatment equipment provided by the present invention comprises a first modified packing area, a biological multiplication area, a second modified packing area, a third modified packing area, a blower and a reflux pump; the incoming water flows through the first modified packing area, the biological multiplication area, the second modified packing area and the third modified packing area in sequence; one end of the reflux pump is connected to the water outlet of the third modified packing area and is used to reflux part of the outflow water, the other end of the reflux pump is connected to the water inlet of the first modified packing area, the blower is connected to the third modified packing area and is used to aerate the third modified packing area; the first modified packing area is used for denitrification treatment, the biological multiplication area is used for anaerobic ammonia oxidation reaction and phosphorus removal, the second modified packing area is used for denitrification while intercepting suspended matter in the water, and the third modified packing area is used to convert the remaining ammonia nitrogen in the water into nitrate nitrogen. This sewage treatment equipment features a biomultiplication zone, which maintains a very high sludge concentration inside the equipment and eliminates the need for sludge return to maintain sludge concentration. The anoxic zone maintains an anaerobic ammonium oxidation (ANAMOX) environment, enabling the growth of ANAMOX bacteria and reducing the carbon source required for denitrification. Anoxic modified packing is used for denitrification and simultaneously intercepts suspended solids in the water, ensuring low levels of suspended solids and organic matter entering the aerobic zone, ultimately achieving low sludge growth. The small particles of modified packing accumulated in the aerobic zone intercept growing microbial flocs, ensuring low SS levels in the aerobic zone's effluent. Modified packing is also installed in the aerobic zone to improve COD and ammonia nitrogen removal efficiency. This solves the problems of existing integrated sewage treatment equipment, which require an external carbon source for denitrification, resulting in high investment and operating costs and complex operation and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 It is a structural schematic diagram of a new type of decentralized sewage treatment equipment provided by an embodiment of the present invention.

[0032] In the picture:

[0033] 1-first modified filler area; 101-first modified filler; 2-biological multiplication area; 3-second modified filler area; 301-second modified filler; 4-third modified filler area; 401-third modified filler; 5-blower; 6-reflux pump; 7-diversion well; 8-connecting pipe. DETAILED DESCRIPTION

[0034] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are intended to illustrate the principles of the present invention and are not intended to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments and covers any modifications, replacements, and improvements to the parts, components, and connection methods without departing from the spirit of the present invention.

[0035] According to an embodiment of the present invention, a new decentralized sewage treatment equipment is provided. Figure 1 As shown, it includes a first modified filler area 1, a biological multiplication area 2, a second modified filler area 3, a third modified filler area 4, a blower 5 and a reflux pump 6; the incoming water flows through the first modified filler area 1, the biological multiplication area 2, the second modified filler area 3 and the third modified filler area 4 in sequence; one end of the reflux pump 6 is connected to the water outlet of the third modified filler area 4 and is used to reflux part of the outflow water, and the other end of the reflux pump 6 is connected to the water inlet of the first modified filler area 1, the blower 5 is connected to the third modified filler area 4 and is used to aerate the third modified filler area 4; the first modified filler area 1 is used for denitrification treatment, the biological multiplication area 2 is used for anaerobic ammonia oxidation reaction and phosphorus removal, the second modified filler area 3 is used for denitrification while intercepting suspended matter in the water, and the third modified filler area 4 is used to convert the remaining ammonia nitrogen in the water into nitrate nitrogen.

[0036] In the above embodiment, a biological multiplication zone 2 is set in the sewage treatment equipment, so that the sludge concentration inside the sewage treatment equipment is very high, so that the sludge return can be eliminated to maintain its sludge concentration; an anaerobic ammonia oxidation environment is maintained in the anoxic zone. Because there is no sludge return in the biological multiplication zone 2, the growth environment is stable, which is conducive to the growth of these slow-growing microorganisms (especially bacteria), so that anaerobic ammonia oxidizing bacteria can grow, thereby reducing the carbon source required for denitrification; an anoxic modified filler is set for denitrification, thereby ensuring that the amount of suspended matter and organic matter concentration entering the aerobic zone is very low, and ultimately achieving low sludge growth, thereby ensuring that the effluent SS (Suspended Solid, suspended solids) of the aerobic zone is at a low value; modified fillers are set in the aerobic zone to improve the COD and ammonia nitrogen removal efficiency. This sewage treatment equipment solves the problems of existing integrated sewage treatment equipment requiring external carbon source denitrification, high investment and operating costs, and complex operation and management. At the same time, the sewage treatment equipment eliminates the traditional secondary sedimentation tank and sludge return pump, thus avoiding the traditional sludge leakage problem, sludge pump failure and maintenance difficulties.

[0037] Specifically, sewage and return clean water first enter the first modified filler area 1, where denitrification reaction occurs, and then flow by gravity to the bio-multiplication area 2, where anaerobic ammonia oxidation reaction and phosphorus removal occur. The effluent of the bio-multiplication area 2 flows by gravity to the second modified filler area 3, where further denitrification is carried out while intercepting suspended matter in the water. The effluent flows by gravity to the third modified filler area 4. The modified filler in the third modified filler area 4 can play a role similar to that of a catalyst, efficiently removing COD (Chemical Oxygen Demand) and ammonia nitrogen in the water; in addition, the stacked modified filler can intercept suspended matter in the water, ensuring that the effluent SS (Suspended solid) meets the standard. The modified filler can cut bubbles in the water and improve the oxygen transfer efficiency. Therefore, the third modified filler area 4 does not require microporous aeration, thereby increasing the service life, reducing the failure rate and the difficulty of inspection and maintenance.

[0038] Among them, the structures of the first modified filler area 1, the biological multiplication area 2, the second modified filler area 3 and the third modified filler area 4 are conventional structures in this field and will not be described here. The first modified filler area 1, the biological multiplication area 2 and the second modified filler area 3 are all anaerobic / anoxic areas, and the third modified filler area 4 is an aerobic area.

[0039] In some optional embodiments, such as Figure 1 As shown, the first modified filler area 1 is filled with a first modified filler 101, the second modified filler area 3 is filled with a second modified filler 301, and the third modified filler area 4 is filled with a third modified filler 401. The first modified filler 101 is a suspended filler, and the second modified filler 301 and the third modified filler 401 are stacked fillers.

[0040] In the above embodiment, the first modified filler 101 is mainly used to intercept the sludge (flocculated structure formed by microorganisms) in the sewage in the first modified filler area 1. Since the amount of sludge in this area is relatively high, the first modified filler 101 with large particle size is more likely to intercept the sludge.

[0041] After being intercepted by the first modified filler area 1, the amount of sludge entering the second modified filler area 3 is significantly reduced. Therefore, in order to intercept microorganisms in sewage, the small-particle second modified filler 301 and the third modified filler 401 are more likely to adsorb microorganisms.

[0042] In some optional embodiments, a sludge drain hole is provided at the bottom of the biomultiplication zone 2, and a removable plug is provided over the drain hole. The drain hole is used to drain sludge generated by internal competition between high concentrations of microorganisms in the zone. The plug normally blocks the drain hole, and when a high sludge production is detected in the zone, the sludge is promptly drained.

[0043] In some optional embodiments, the first modified filler 101 is composed of suspended particles with a wrinkled surface. The large surface area of the wrinkled suspended particles facilitates microbial attachment and growth, thereby increasing the concentration of activated sludge entering the biomultiplication zone 2. Specifically, the particle size is not specifically limited, but preferably is 20-30 mm.

[0044] In some optional embodiments, the particle size of the second modified filler 301 is larger than the diameter of the third modified filler 401. There is no specific limitation on the particle size, but preferably the particle size of the second modified filler 301 is 8-10 mm, and the particle size of the third modified filler 401 is 1-5 mm.

[0045] In some optional embodiments, the second modified filler 301 is a processed mineral filler, wherein the second modified filler 301 is stacked in the second modified filler area 3 .

[0046] In some optional embodiments, the third modified filler 401 is a processed mineral filler, wherein the third modified filler 401 is stacked and disposed in the third modified filler area 4 .

[0047] In some optional embodiments, such as Figure 1 As shown, the biomultiplication zone 2 and the second modified filler zone 3 are connected via a diversion well 7. One end of the diversion well 7 is connected to the upper end of the biomultiplication zone 2, and the other end of the diversion well 7 is connected to the lower end of the second modified filler zone 3. This diversion well connection allows the sewage level entering the second modified filler zone 3 to rise slowly within the second modified filler zone 3, allowing for sufficient contact between the sewage and the modified filler, thereby improving sludge retention. Furthermore, the filler acts as a catalyst, accelerating the reaction rate between nitrate nitrogen and COD, thereby removing large amounts of COD.

[0048] In some optional embodiments, such as Figure 1 As shown, the second modified filler area 3 and the third modified filler area 4 are connected by a connecting pipe 8. One end of the connecting pipe 8 is connected to the upper end of the second modified filler area 3, and the other end of the connecting pipe 8 is connected to the lower end of the third modified filler area 4. The connecting pipe 8 increases the water level of the sewage entering the third modified filler area 4 and allows it to rise slowly within the third modified filler area 4, allowing the sewage to fully contact the modified filler and improving the retention of microorganisms in the sludge. At the same time, the microorganisms retained on the modified filler react with the ammonia nitrogen in the sewage to convert it into nitrate nitrogen, thereby removing the ammonia nitrogen in the sewage.

[0049] In some optional embodiments, such as Figure 1 As shown, the outlet of the third modified filler area 4 is located at its upper end. This arrangement of the outlet is more conducive to full contact between sewage and modified filler, thereby improving various indicators of effluent.

[0050] In some optional embodiments, such as Figure 1 As shown, the blower 5 is provided at the lower end of the third modified filler area 4. The blower 5 is provided in this manner because the density of gas is less than that of water. Therefore, the air entering the third modified filler area 4 will flow upward from the bottom of the area, which is conducive to the growth of microorganisms attached to the modified filler and further improves the removal of ammonia nitrogen.

[0051] This example is the Beijing Baishuiwa sewage treatment plant, with a treatment capacity of 20 tons / day. The specific treatment process is as follows:

[0052] After filling the third modified filler area 4, the second modified filler area 3, the biological multiplication area 2 and the first modified filler 1 in sequence, stop the water intake;

[0053] Start the blower 5 to aerate the third modified filler area 4, convert the remaining ammonia nitrogen in the water into nitrate nitrogen, and oxidize the remaining COD into carbon dioxide;

[0054] Start the reflux pump 6 to return the effluent from the third modified filler area 4 to the first modified filler 1 for denitrification treatment;

[0055] After 7 days of continuous operation, the effluent from the third modified filler area 4 is directly discharged;

[0056] After continuous water inflow for 15 hours, stop water inflow and outflow and drain directly;

[0057] Continuous operation for 7 days;

[0058] Continuous water inflow and outflow for direct discharge.

[0059] The following test methods are used to test various indicators in the effluent:

[0060] Total nitrogen is tested using the national standard method;

[0061] Ammonia nitrogen is tested using the national standard method;

[0062] Total phosphorus was tested using the national standard method;

[0063] COD is tested using the Hach instrument method and the national standard method. The national standard is compared with the Hach instrument in the early stage. After finding the correlation, the Hach instrument is used for analysis.

[0064] The novel decentralized sewage treatment equipment provided by the embodiments of the present invention has the following advantages:

[0065] Low operating cost, eliminating the cost of carbon source; less air demand, which means lower aeration fan performance; can form phosphine, reducing the dosage of phosphorus removal agents;

[0066] The mud discharge operation is simple, and the mud discharge pump only needs to be started once every three months, and each time it is fixed for a certain period of time (related to the specific conditions of the project construction site);

[0067] The treatment effect is good and can stably meet the national Class A emission standard. When running at low load, the effluent quality is close to the fourth category of surface water (TN is about 5mg / L);

[0068] The system is simple, without additional secondary sedimentation tanks and carbon source dosing systems;

[0069] Aeration does not require microporous aeration, and the aeration system will be maintenance-free;

[0070] The operation and maintenance are simple and can be operated by local villagers. The present invention only requires regular cleaning of the front screen, and the rest are automatically operated.

[0071] It should be noted that the various embodiments in this specification are described in a progressive manner. References to the same or similar parts between the various embodiments are sufficient. Each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and technologies are omitted here.

[0072] The above are merely embodiments of the present application and are not intended to limit the present application. Various modifications and variations are possible for those skilled in the art without departing from the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A decentralized sewage treatment equipment, characterized in that: The invention comprises a first modified filler area (1), a biological multiplication area (2), a second modified filler area (3), a third modified filler area (4), a blower (5) and a reflux pump (6); the incoming water flows through the first modified filler area (1), the biological multiplication area (2), the second modified filler area (3) and the third modified filler area (4) in sequence; one end of the reflux pump (6) is connected to the water outlet of the third modified filler area (4) and is used to reflux part of the outflow water, and the other end of the reflux pump (6) is connected to the water inlet of the first modified filler area (1); the blower (5) is connected to the third modified filler area (4) and is used to aerate the third modified filler area (4); the first modified filler area (1) is used for denitrification treatment, and the biological multiplication area (2) is used for anaerobic ammonia oxidation reaction. The invention relates to a method for removing phosphorus, wherein the second modified filler area (3) is used for removing nitrogen and intercepting suspended matter in water at the same time, and the third modified filler area (4) is used for converting the remaining ammonia nitrogen in water into nitrate nitrogen; the first modified filler area (1) is filled with a first modified filler (101), the second modified filler area (3) is filled with a second modified filler (301), and the third modified filler area (4) is filled with a third modified filler (401); the first modified filler (101) is a suspended filler, and the second modified filler (301) and the third modified filler (401) are stacked fillers; the particle size of the second modified filler (301) is larger than the diameter of the third modified filler (401); the second modified filler is a treated mineral filler, and the third modified filler is a treated mineral filler; The biomultiplication zone (2) has no sludge return and is used for the growth of anaerobic ammonia-oxidizing bacteria to reduce the carbon source required for denitrification; a sludge discharge hole is provided at the bottom of the biomultiplication zone 2, and a detachable hole plug is provided at the sludge discharge hole; The first modified filler (101) is a suspended particle with wrinkles on the surface; The biological multiplication zone (2) and the second modified filler zone (3) are connected via a diversion well (7), one end of the diversion well (7) is connected to the upper end of the biological multiplication zone (2), and the other end of the diversion well (7) is connected to the lower end of the second modified filler zone (3); The second modified filler area (3) is connected to the third modified filler area (4) via a connecting pipe (8), one end of the connecting pipe (8) is connected to the upper end of the second modified filler area (3), and the other end of the connecting pipe (8) is connected to the lower end of the third modified filler area (4); The water outlet of the third modified filler area (4) is arranged at its upper end.

2. The decentralized sewage treatment equipment according to claim 1, characterized in that: The blower (5) is arranged at the lower end of the third modified filler zone (4).

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