A vertical shaft sewage treatment equipment

Abstract

The present invention relates to a shaft-type sewage treatment equipment, including a shaft-shaped equipment body, the equipment body including a shaft reaction tank and a sedimentation tank, the shaft reaction tank and the sedimentation tank are separated by a middle partition, the shaft reaction tank is connected to a water inlet pipe, wherein the shaft reaction tank is divided into four areas from top to bottom, including a biological filler area, a reaction area, a sludge interception area and a sludge settling area, the depth of the shaft reaction tank is between 5 and 10 meters and the equipment body is set in the land. The shaft form adopted can reach 10m or more vertically, all located underground, and can effectively use the ground temperature as a heat source to increase the temperature of sewage, and can increase the temperature of rural sewage in northern winter without increasing costs.

Description

Technical Field

[0001] The invention belongs to the field of rural sewage treatment, and in particular relates to a vertical shaft type sewage treatment equipment. Background Art

[0002] Rural sewage treatment technology has its own distinct characteristics, and there are great differences between regions. The problem of low temperature and difficult biochemical treatment of rural sewage in winter in northern my country has become a problem and the main reason for the low compliance rate of sewage treatment in many rural areas. The cost of heating by steam, electricity and other methods is very high, and there are safety hazards, which is difficult to achieve. Research on technologies that effectively improve the efficiency of winter sewage treatment has become a key link in solving rural sewage treatment in northern my country. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a vertical shaft type sewage treatment equipment, including a vertical shaft-shaped equipment body, the equipment body including a vertical shaft reaction tank and a sedimentation tank, the vertical shaft reaction tank and the sedimentation tank are separated by a middle partition, the vertical shaft reaction tank is connected to a water inlet pipe, wherein the vertical shaft reaction tank is divided into four areas from top to bottom, including a biological filler area, a reaction area, a sludge retention area and a sludge sedimentation area, the depth of the vertical shaft reaction tank is between 5-10 meters and the equipment body is set in the land.

[0004] Preferably, the water inlet of the water inlet pipe extends into the position of the reaction zone.

[0005] Preferably, a mud discharge pipe is provided in the vertical shaft reaction tank, a mud discharge suction port of the mud discharge pipe is provided in the mud settling area, and a mud discharge ventilation pipe is provided at the upper end of the mud discharge pipe.

[0006] In any of the above schemes, preferably, the biological filler area is provided with biological fillers.

[0007] In any of the above schemes, preferably, an aeration pipe is arranged in the vertical shaft reaction tank, and the perforated aeration pipe of the aeration pipe is located below the biological filler.

[0008] In any of the above solutions, preferably, a connection port is provided on the middle partition.

[0009] In any of the above schemes, it is preferred that inclined plate fillers are provided in the sedimentation tank.

[0010] In any of the above schemes, it is preferred that a perforated water collecting device is provided in the sedimentation tank, and the perforated water collecting device is connected to the water outlet pipe.

[0011] Technical features: The reaction tank adopts a shaft design and is located underground. The ground temperature below the freezing line will gradually increase. Under normal conditions, the temperature is basically 12-17°C at 5-10m below the ground. In winter, the sewage temperature can reach above 10°C through the ground temperature and hydraulic circulation. The actual ground temperature controls the sewage temperature within a smaller fluctuation range; the vertical layout greatly saves space; a diversion baffle is set in the middle, and aeration is performed on one side of the middle and upper parts to form a circulation of water in the reaction tank. Different circulation ratios can be formed according to the aeration intensity, and there are no mechanical facilities in the system; local aeration can naturally form different reaction zones in the reaction tank; braided biological fillers are set in the aeration zone to increase biomass; the mud liquid in the reaction tank will form a concentration gradient vertically, and the activated sludge with a larger specific gravity in the lower part will be used to form a retention layer to retain large particles in the raw water; the bottom of the reaction zone is a sludge tank, and the precipitated sludge can flow into the system by gravity without the need for separate reflux power.

[0012] The present invention also provides a vertical shaft rural sewage treatment process, including aeration and oxygenation combined with airlift hydraulic circulation technology, biological treatment technology, unpowered return flow of precipitated sludge technology, winter geothermal heating sewage technology, sludge layer interception technology, and perforated water collection device technology. The aeration and oxygenation technology uses a blower to aerate the system and form an aerobic zone in the aeration area; the combined airlift hydraulic circulation technology uses compressed air to pass into the constrained water body. When the air is released, the density difference of the water body is reduced, causing the water body to flow upward, thereby forming a hydraulic circulation in the system and forming various reaction zones in the vertical shaft area; the biological treatment technology, the water flow is oxygenated during the airlift process, and its dissolved oxygen is relatively high. It passes through the area where the biological filler is set, and is adsorbed and exchanged with the biofilm on the filler. The biofilm degrades the adsorbed pollutants, thereby achieving the purpose of removing pollutants from the water; the unpowered return flow technology of precipitated sludge uses a slope of not less than 60° at the bottom of the sedimentation tank to slide the precipitated sludge to the opening between the reaction tank and then re-enter the reaction system; the geothermal heating Hot sewage technology, the reaction tank (which can be a regulating tank) is partially located underground, and the depth can reach 10m. The underground temperature increases with the depth. The temperature at a depth of 5 to 10m underground in the northern region reaches 12 to 17°C. When the water circulates in the reaction tank, heat is transferred through the box. The ground temperature gradually increases the sewage temperature, which can reach above 10°C. Similarly, the sewage temperature will also decrease in other seasons, and the temperature can be kept within a small fluctuation range all year round; the sludge retention technology, due to gravity, particles with larger specific gravity will accumulate at the bottom of the reaction tank to form a sludge layer, which can intercept larger suspended particles in the raw water; the perforated water collection device is a collection device composed of perforated pipes independently developed by our company, which has the function of isolating scum and improving the difficulty of sedimentation and water collection.

[0013] In the above technology, it is preferred that the biological treatment zone is provided with a braided fixed biological filler, and the inoculated sludge can be used to accelerate the biofilm formation of the filler to form a suitable biological flora.

[0014] In the above technology, it is preferred that the depth of the vertical shaft should reach 5 to 10 meters underground, so that a relatively stable geothermal source can be provided to achieve the water temperature required for treatment.

[0015] In the above technology, it is preferred that the reaction tank should have sufficient circulation heat transfer time so that under normal treatment conditions, the sewage temperature of the sewage system can reach the design requirements.

[0016] Among the above technologies, it is preferred that the gas lift hydraulic cycle uses conventional wind pressure to circulate and oxygenate the water body and form a DO concentration gradient in the reactor, thereby forming different reaction zones and saving energy.

[0017] In the above technology, it is preferred that the precipitated sludge is unpowered to return, and the precipitated sludge can be returned to the reaction system by gravity, which is suitable for small-scale sewage treatment;

[0018] Among the above technologies, the preferred one is the sludge retention technology. Due to gravity, particles with larger specific gravity will accumulate at the bottom of the reaction tank to form a sludge layer, which can intercept larger suspended particles in the raw water, and then undergo hydrolysis and acidification reactions to improve biodegradability.

[0019] In the technology, it is preferred that the reactors can be connected in parallel or in series, and a connecting pipe is provided on the upper part of the reaction tank to form a multi-stage AO process to meet the needs of different processing scales.

[0020] The purpose of the present invention is to provide a vertical shaft rural sewage treatment technology that utilizes natural conditions to increase the temperature of sewage. The technology adopts a vertical shaft form that can reach 10m or higher vertically and is located underground. It can effectively utilize ground temperature as a heat source to increase the temperature of sewage. It can increase the temperature of rural sewage in northern regions in winter without increasing costs (it is also effective in other regions).

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) Existing technologies cannot increase the temperature of rural sewage in winter at low cost;

[0023] (2) Vertical shaft design technology can greatly save space for treatment facilities;

[0024] (3) The shaft reactor can be manufactured in sections in the depth direction and then connected with flanges on site, which can effectively solve the problems of equipment transportation and equipment installation;

[0025] (4) Vertical shaft reactors can be connected in parallel or in series to meet different processing scale requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a preferred embodiment of a vertical shaft type sewage treatment equipment according to the present invention;

[0027] Explanations in the figure: 1 water inlet pipe; 2 mud discharge ventilation pipe; 3 biological filler; 4 mud discharge pipe; 5 water inlet; 6 mud discharge suction port; 7 aeration pipe; 8 perforated water collecting device; 9 water outlet pipe; 10 inclined plate filler; 11 perforated aeration pipe; 12 connection port; 13 upper and lower connecting flanges; 14 middle partition; 15 sludge retention area; 16 sludge settling area; 17 vertical shaft reaction tank; 18 sedimentation tank. DETAILED DESCRIPTION

[0028] In order to further understand the content of the present invention, the present invention will be described in detail below in conjunction with specific embodiments.

[0029] like Figure 1 As shown, the present invention provides a vertical shaft type sewage treatment equipment, including a vertical shaft-shaped equipment body, the equipment body including a vertical shaft reaction tank 17 and a sedimentation tank 18, the vertical shaft reaction tank 17 and the sedimentation tank 18 are separated by a middle partition 14, the vertical shaft reaction tank 17 is connected to the water inlet pipe 1, wherein the vertical shaft reaction tank 17 is divided into four areas from top to bottom, including a biological filler area, a reaction area, a sludge retention area and a sludge settling area 16, the depth of the vertical shaft reaction tank 17 is between 5-10 meters and the equipment body is set in the ground, the water inlet 5 of the water inlet pipe 1 extends into the position of the reaction area, the vertical shaft A mud discharge pipe 4 is arranged in the reaction tank 17, and a mud discharge suction port 6 of the mud discharge pipe 4 is arranged in the mud settling area 16. A mud discharge ventilation pipe 2 is arranged at the upper end of the mud discharge pipe 4. A biological filler 3 is arranged in the biological filler area. An aeration pipe 7 is arranged in the vertical shaft reaction tank 17. The perforated aeration pipe 11 of the aeration pipe 7 is located below the biological filler. A connecting port 12 is arranged on the middle partition 14. The upper and lower parts of the vertical shaft reaction tank 17 are connected by upper and lower connecting flanges 13. An inclined plate filler 10 is arranged in the sedimentation tank 18. A perforated water collecting device 8 is arranged in the sedimentation tank 18, and the perforated water collecting device 8 is connected to the outlet pipe 9.

[0030] When this embodiment is used, raw water enters the reactor through the water inlet pipe 01, and is transported to the perforated aeration pipe 11 through the pipe 07 by using the compressed air (wind pressure 3.5-5m) provided by the conventional fan. The released air is the oxygen source for the system on the one hand, and on the other hand, the water body can form a hydraulic circulation in the reaction tank 17 with the help of the middle partition 14. At the same time, since the tank body is located underground and the depth reaches 10m, the water in the reaction tank 17 exchanges heat with the surrounding soil, so that the sewage temperature is increased to above 10°C (related to the incoming water temperature, ground temperature and reaction time). A filler area is set above the perforated aeration pipe, and biological filler 03 is installed. Due to aeration and oxygenation, this area is aerobic. Zone, as the circulation DO gradually decreases, it transitions to the anoxic zone; due to the hydraulic circulation and gravity, a sludge layer will be formed in the sludge retention area 15 at the bottom of the reaction tank 17, which is conducive to retaining large suspended particles, and a certain hydrolysis will occur in this area; the muddy water in the reaction tank 17 enters the sedimentation tank 18 from the reaction tank / sedimentation tank connection port 12, and is separated from the mud by the inclined plate filler 10. The supernatant is collected by the perforated water collection device 08 and discharged from the system by the outlet pipe 09, while the sludge slides back into the reaction tank 17 through the lower inclined plate of the sedimentation tank 18; the remaining sludge is stored in the sludge area 16 at the bottom of the reaction tank 17, and is discharged externally after being lifted by a pump through the sludge discharge pipe 04 or discharged by an external pump.

[0031] Test Example 1

[0032] Based on the above working principle, we conducted a small test study, using a 0.8m×0.8m×1.2m water tank, controlling the internal water temperature at 15℃, and using two 2m long DN150 transparent plastic pipes, connecting them up and down, arranged vertically, that is, about 1 / 2 of the pipes are immersed in water, and the leaking part is in the atmosphere. The small test was carried out at the natural temperature indoors in winter. By setting up a small aeration facility in the single-side tank body, the raw water uses refrigerator refrigerated water, about 4℃. The test proves that under the condition of continuous water inflow, the water temperature in the reactor can be raised to 10-12℃ through hydraulic circulation.

[0033] Experiments have shown that under reasonable flow control conditions, the water temperature in the reactor can be raised to a temperature slightly lower than or close to the corresponding ambient temperature by using a suitable relatively constant external ambient temperature.

[0034] Test Example 2

[0035] Based on the above working principle, we conducted a technical application study and used a 0.8m×0.8m×8.5m reaction pool to conduct a simulated production test with a processing capacity of 5 to 12m 3 / d, the test was started in October, using the activated sludge of the sewage treatment plant to cultivate the test biochemical system, and the test was officially started in December. The test water inlet temperature is 1-5℃ (the raw water after filtration enters the test system after being stored outdoors), the water in the biochemical reaction pool of the sewage plant (the water temperature in winter is 12-15℃) is used as the heat source, the pool body is immersed in 5m, and the depth above the water surface is 3.5m (the reaction pool and sedimentation pool above the water surface are insulated), the supporting fan power N=0.75kW, and the air-water ratio is adjustable from 8 to 30:1.

[0036] After the system operation parameters were adjusted, the sewage temperature in the reaction tank could reach 10-12°C, and the COD and NH 3 -N and TN indicators have achieved good treatment effects.

[0037] It is not difficult for those skilled in the art to understand that the vertical shaft sewage treatment equipment of the present invention includes any combination of the invention content and specific implementation methods of the above-mentioned invention specification and the various parts shown in the drawings. Due to the limited space and to make the specification concise, the various schemes composed of these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vertical shaft sewage treatment equipment, comprising a shaft-shaped equipment body, the equipment body comprising a vertical shaft reaction tank and a sedimentation tank, the vertical shaft reaction tank and the sedimentation tank are separated by a middle partition, the vertical shaft reaction tank is connected to a water inlet pipe, characterized in that: The vertical shaft reaction tank is divided into four areas from top to bottom, including a biological filler area, a reaction area, a sludge interception area and a sludge settling area, the depth of the vertical shaft reaction tank is between 5-10 meters and the equipment body is set in the land; The water inlet of the water inlet pipe extends into the position of the reaction zone; A mud discharge pipe is arranged in the vertical shaft reaction tank, a mud discharge suction port of the mud discharge pipe is arranged in the mud settling area, and a mud discharge ventilation pipe is arranged at the upper end of the mud discharge pipe; The biological filler area is provided with biological fillers; An aeration pipe is arranged in the vertical shaft reaction tank, and the perforated aeration pipe of the aeration pipe is located below the biological filler; The middle partition is provided with a connection port; An inclined plate filler is arranged in the sedimentation tank; A perforated water collecting device is arranged in the sedimentation tank, and the perforated water collecting device is connected with the water outlet pipe.

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