Integrated device for rural sewage treatment

Abstract

The utility model discloses an integrated device for rural sewage treatment, which comprises a first biological membrane filter tank, a second biological membrane filter tank, a third biological membrane filter tank and an aeration pipe, and the first biological membrane filter tank, the second biological membrane filter tank and the third biological membrane filter tank are sequentially arranged left and right. The first biological membrane filter tank, the second biological membrane filter tank and the third biological membrane filter tank all adopt tower type biological filter tanks, so that stable biological membranes can be formed on filter materials in the filter tanks by utilizing the specific attributes of strains in the filter tanks to adapt to the environmental conditions of the filter tanks, and the sewage treatment efficiency is improved; the tower-type biological filter is adopted, so that the whole structure of the device is more compact, and the whole occupied area is reduced; by adopting the tower-type biological filter, the layout of the aeration pipe can be optimized, and the aeration energy consumption is reduced; the integrated device disclosed by the utility model can be used for automatically treating rural sewage without manual guarding, so that the labor cost and the operation difficulty are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to an integrated device for rural sewage treatment. Background Art

[0002] Rural domestic sewage mainly comes from sewage generated by rural residents' activities, including flushing toilets, washing, bathing and kitchen drainage. It has the characteristics of dispersed discharge, complex sewage composition, relatively high pollutant concentration and large fluctuations in water quality. It is difficult to treat it on a large scale. The treatment process of traditional sewage treatment plants is not suitable. It is urgent to choose a sewage treatment facility suitable for the characteristics of rural domestic sewage. The integrated device for rural sewage treatment has the characteristics of small footprint, short construction period and low operation and maintenance frequency. It is particularly suitable for areas with dispersed rural layout and has become the mainstream method of rural domestic sewage treatment.

[0003] The anaerobic-anoxic-aerobic activated sludge process is a widely used treatment technology for domestic sewage treatment. It removes organic pollutants, nitrogen, phosphorus, etc. in water through various combinations of anaerobic, anoxic and aerobic zones and different sludge return methods. The anaerobic-anoxic-aerobic activated sludge process requires human operation and maintenance to observe abnormal conditions of activated sludge for timely operation and manual intervention. The membrane bioreactor installs ultrafiltration membrane components to replace the activated sludge pool to purify sewage. There is no need for sludge return, which can realize the automatic treatment of rural sewage and reduce the frequency of operation and maintenance. However, the membrane bioreactor has high investment costs and high energy consumption.

[0004] The biofilm filter uses a block filter layer as a component. After the sewage flows through, a biofilm will be formed on the surface. The microorganisms on the biofilm absorb the organic matter in the sewage as nutrition, thereby purifying the sewage. The biofilm filter has the advantages of high organic load, small footprint, low investment, no sludge bulking, high oxygen transfer efficiency, and good effluent quality. However, it has strict requirements on the influent SS (generally SS≤100mg / L, preferably SS≤60mg / L), so the influent needs to be pretreated. The aerated biological filter integrates biological oxidation and interception of suspended solids. It has large volumetric load and hydraulic load, short hydraulic retention time, low infrastructure investment, good effluent quality, low operating energy consumption, and low operating costs. Compared with ordinary activated sludge method and other processes, the biofilm filter is more suitable for rural sewage integrated treatment application scenarios. Utility Model Content

[0005] The purpose of the utility model is to provide an integrated device for rural sewage treatment to solve one or more technical problems existing in the above-mentioned background technology.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] An integrated device for rural sewage treatment comprises a first biofilm filter, a second biofilm filter, a third biofilm filter and an aeration pipe, wherein the first biofilm filter, the second biofilm filter and the third biofilm filter are arranged in sequence on the left and right, an input end of the first biofilm filter is provided with an inlet pipe, the inlet pipe is used to be connected to a sewage lifting pump, an output end of the first biofilm filter is connected to the input end of the second biofilm filter, an output end of the second biofilm filter is connected to the input end of the third biofilm filter, an outlet pipe is provided at the output end of the third biofilm filter, the water flow direction of the first biofilm filter and the third biofilm filter is from top to bottom, and the water flow direction of the second biofilm filter is from bottom to top; the aeration pipe is used to be connected to an aeration blower, and the aeration pipe extends to the bottom of the second biofilm filter; the first biofilm filter, the second biofilm filter and the third biofilm filter are all filled with floating filter materials, and the first biofilm filter, the second biofilm filter and the third biofilm filter are all tower biofilters.

[0008] Preferably, it also includes an inlet pool and a grille filter structure, wherein the inlet pool is arranged above the first biological treatment pool, the inlet pool is connected to the input end of the first biological treatment pool, the grille filter structure is horizontally arranged in the inlet pool, and the inlet pipe is located above the grille filter structure.

[0009] Preferably, the mesh size of the grid filtering structure is 2.5 mm.

[0010] Preferably, it also includes a first water distribution structure and a second water distribution structure, the first water distribution structure is arranged at the bottom of the first biofilm filter and the second biofilm filter, the first water distribution structure is respectively connected to the first biofilm filter and the second biofilm filter, the second water distribution structure is arranged at the bottom of the third biofilm filter, and the second water distribution filter is respectively connected to the third biofilm filter and the outlet pipe.

[0011] Preferably, it also includes a third water distribution structure and a return pipe, the third water distribution structure is arranged above the second biofilm filter, the third water distribution structure is respectively connected with the second biofilm filter, the third biofilm filter and one end of the return pipe, the other end of the return pipe is connected with the water inlet tank, and there is a height difference between the top of the second biofilm filter and the top of the third biofilm filter.

[0012] Preferably, it further comprises a flocculant delivery mechanism, the flocculant delivery mechanism is connected to the output end of the second biofilm filter, and the flocculant delivery mechanism is used for delivering flocculants.

[0013] Preferably, it further comprises a carbon source delivery mechanism, wherein the carbon source delivery mechanism is connected to the output end of the second biofilm filter, and the carbon source delivery mechanism is used for delivering the carbon source.

[0014] The beneficial effects of the utility model are as follows: the first biofilm filter, the second biofilm filter and the third biofilm filter arranged in the utility model all adopt tower-type biofilters, thereby utilizing the fixed specificity of the bacterial species in each filter to form a stable biofilm on the filter material in each filter to adapt to the environmental conditions of each filter and improve the sewage treatment efficiency; the use of the tower-type biofilter also makes the overall structure of the device more compact and reduces the overall footprint; the use of the tower-type biofilter can also optimize the layout of the aeration pipe and reduce aeration energy consumption; the integrated device of the utility model can realize automatic treatment of rural sewage without manual supervision, which greatly reduces labor costs and operating difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings further illustrate the present invention, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0016] Figure 1 It is a schematic diagram of the overall structure of one embodiment of the utility model.

[0017] Among them: the first biofilm filter 1, the second biofilm filter 2, the third biofilm filter 3, the aeration pipe 4, the water inlet pipe 5, the sewage lifting pump 6, the aeration blower 7, the floating filter material 8, the water inlet tank 9, the grid filter structure 10, the first water distribution structure 11, the second water distribution structure 12, the water outlet pipe 13, the third water distribution structure 14, the return pipe 15, the flocculant delivery mechanism 16, and the carbon source delivery mechanism 17. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0019] An integrated device for rural sewage treatment in this embodiment is shown in the attached Figure 1, comprising a first biofilm filter 1, a second biofilm filter 2, a third biofilm filter 3 and an aeration pipe 4, wherein the first biofilm filter 1, the second biofilm filter 2 and the third biofilm filter 3 are arranged left and right in sequence, an input end of the first biofilm filter 1 is provided with an inlet pipe 5, the inlet pipe 5 is used to be connected to a sewage lifting pump 6, an output end of the first biofilm filter 1 is connected to an input end of the second biofilm filter 2, an output end of the second biofilm filter 2 is connected to an input end of the third biofilm filter 3, and the third biofilm filter 3 is connected to an outlet end of the second biofilm filter 2. An outlet pipe 13 is provided at the output end, the water flow direction of the first biofilm filter 1 and the third biofilm filter 3 is from top to bottom, and the water flow direction of the second biofilm filter 2 is from bottom to top; the aeration pipe 4 is used to be connected to the aeration blower 7, and the aeration pipe 4 extends to the bottom of the second biofilm filter 2; the first biofilm filter 1, the second biofilm filter 2 and the third biofilm filter 3 are all filled with floating filter materials 8, and the first biofilm filter 1, the second biofilm filter 2 and the third biofilm filter 3 are all tower biofilters.

[0020] The first biofilm filter 1, the second biofilm filter 2 and the third biofilm filter 3 arranged in this embodiment all adopt tower-type biofilters, thereby utilizing the fixed specificity of the bacterial species in each filter to form a stable biofilm on the filter material in each filter to adapt to the environmental conditions of each filter and improve the sewage treatment efficiency; the use of tower-type biofilters also makes the overall structure of the device more compact and reduces the overall footprint; the use of tower-type biofilters can also optimize the layout of the aeration pipe 4 and reduce aeration energy consumption; by arranging the water inlet pipe 5 connected to the sewage lifting pump 6 for introducing sewage, and arranging the aeration pipe 4 connected to the aeration blower 7, the second biofilm filter 2 is in an aerobic state, thereby the operation of the sewage treatment pump and the aeration blower 7 enables the integrated device of this embodiment to realize automatic treatment of rural sewage without manual supervision, which greatly reduces labor costs and operating difficulty.

[0021] The water flow direction of the first biofilm filter 1 is from top to bottom, and it is used for pre-filtering and pre-treatment of sewage, denitrification, denitrification and dephosphorization, and removal of organic matter. The floating filter material 8 in the first biofilm filter 1 has a high removal rate of suspended solids, and the pre-treatment effect is reliable; the organic matter in the sewage is fully utilized as a carbon source, which promotes the growth of heterotrophic bacteria and reduces the amount of sludge discharged from the filter; the denitrifying biofilm grows well under anoxic conditions, achieving efficient denitrification of sewage; at the same time, heterotrophic bacteria can also effectively absorb phosphorus; the floating ceramsite used has a density similar to that of water, which is easy to flush and fluidize, avoiding the problem of filter material compaction.

[0022] The water flow direction of the second biofilm filter 2 is from bottom to top, which is used to nitrify ammonia nitrogen in sewage. The use of floating ceramsite as floating filter material 8 improves oxygen utilization and reduces aeration energy consumption. The end of the aeration pipe 4 extends to the bottom of the second biofilm filter 2 so that the flow directions of oxygen and sewage are the same, so that the floating ceramsite has good self-cleaning conditions and the biofilm is updated quickly. Under low BOD5 conditions, the nitrification efficiency is high, which is conducive to the growth of nitrifying bacteria; compared with the activated sludge method, the conditions are better and the nitrification process of ammonia nitrogen can be completed in just a few minutes. And because the autotrophic bacteria multiply slowly, basically no residual sludge is produced. The second biofilm filter 2 also uses special floating ceramsite, which has a small filtration head loss, further improving the filtration efficiency.

[0023] The third-stage downflow water flow direction of the third biofilm filter 3 is from bottom to top, which is used to filter suspended particles and deeply remove phosphorus and nitrogen. By further removing suspended particles, the effluent water quality is stabilized to meet the standard; if it is necessary to further remove total phosphorus and total nitrogen to improve the discharge standard, it is only necessary to add a flocculant mechanism and a carbon source delivery mechanism 17 to deliver flocculants and carbon sources to the output end of the second biofilm filter 2 to achieve the removal of total phosphorus and total nitrogen.

[0024] Preferably, it also includes an inlet tank 9 and a grid filter structure 10. The inlet tank 9 is arranged above the first biological treatment tank. The inlet tank 9 is connected to the input end of the first biological treatment tank. The grid filter structure 10 is horizontally arranged in the inlet tank 9, and the inlet pipe 5 is located above the grid filter structure 10. By arranging the inlet tank 9 above the first biological treatment tank, the sewage can be temporarily stored and adjusted in the inlet tank 9 before entering the first biological treatment tank, so as to stabilize the flow rate of sewage entering and ensure the efficient operation of the sewage treatment process. The grid filter structure 10 is arranged in the inlet tank 9, so that the sewage is first intercepted by the grid filter structure 10 before entering the first biological treatment tank, effectively removing larger suspended matter and impurities in the sewage, preventing impurities from clogging and damaging the biofilm filter, and the self-purification of the grid filter structure 10 can be maintained when the treated sewage in the first biological treatment tank is backwashed.

[0025] Furthermore, the mesh size of the grid filter structure 10 is 2.5 mm. Therefore, the grid filter structure 10 with a mesh size of 2.5 mm can not only intercept large suspended solids and impurities in the sewage, but also intercept the floating filter material 8 in the first biofilm treatment tank during backwashing of the first biofilm treatment tank, thereby maintaining the self-cleaning of the grid filter structure 10 through backwashing.

[0026] Preferably, it further comprises a first water distribution structure 11 and a second water distribution structure 12, wherein the first water distribution structure 11 is arranged at the bottom of the first biofilm filter 1 and the second biofilm filter 2, and the first water distribution structure 11 is respectively connected to the first biofilm filter 1 and the second biofilm filter 2, and the second water distribution structure 12 is arranged at the bottom of the third biofilm filter 3, and the second water distribution filter is respectively connected to the third biofilm filter and the outlet pipe 13. Thus, by arranging the first water distribution structure 11 and the second water distribution structure 12, the output end of the first biofilm filter 1 is connected to the input end of the second biofilm filter 2, and the output end of the third biofilm filter 3 is connected to the outlet pipe 13.

[0027] Preferably, it also includes a third water distribution structure 14 and a return pipe 15. The third water distribution structure 14 is arranged above the second biofilm filter 2. The third water distribution structure 14 is respectively connected to the second biofilm filter 2, the third biofilm filter 3 and one end of the return pipe 15. The other end of the return pipe 15 is connected to the inlet pool 9. There is a height difference between the top of the second biofilm filter 2 and the top of the third biofilm filter 3. Thus, by setting the third water distribution structure 14, the output end of the second biofilm filter 2 is connected to the input end of the third biofilm filter 3. The return pipe 15 is set to connect the input end of the second biofilm filter 2 with the inlet pool 9. When the inlet flow rate of the second biofilm filter 2 is greater than the outlet flow rate, the overflowed sewage enters the inlet pool 9 again through the return pipe 15, which plays a buffering role and ensures the stability of the device operation. By setting the top of the second biofilm filter 2 higher than the top of the third biofilm filter 3, there is a height difference between the top of the second biofilm filter 2 and the top of the third biofilm filter 3, thereby utilizing the effect of gravity to ensure that the water flow direction of the third biofilm filter 3 is from top to bottom. The first water distribution structure 11, the second water distribution structure 12 and the third water distribution structure 14 can all use water distributors or water distribution tanks.

[0028] Preferably, the system further comprises a flocculant delivery mechanism 16, which is connected to the output end of the second biofilm filter 2 and is used to deliver flocculants. By delivering flocculants through the flocculant delivery mechanism 16, the sewage is first subjected to micro-flocculation filtration after being filtered through the second biofilm filter 2 before entering the third biofilm filter 3, and total phosphorus can be further removed to achieve higher discharge standards.

[0029] Preferably, a carbon source delivery mechanism 17 is further included, and the carbon source delivery mechanism 17 is connected to the output end of the second biofilm filter 2, and the carbon source delivery mechanism 17 is used to deliver the carbon source. Through the delivery of the carbon source by the carbon source delivery mechanism 17, the sewage is filtered through the second biofilm filter 2 and before entering the third biofilm filter 3, the sewage is first subjected to further anoxic denitrification by the delivered carbon source to remove total nitrogen, so as to achieve a higher discharge standard.

[0030] The working principle of the integrated device for rural sewage treatment of this embodiment is as follows: First, the sewage to be treated is introduced into the water inlet pool 9 through the water inlet pipe 5 under the action of the sewage lifting pump 6. The water inlet pool 9 plays a role in buffering and temporarily storing the sewage, ensuring the stable operation of the subsequent treatment process. Subsequently, under the combined action of the sewage lifting pump 6 and gravity, the sewage flows from top to bottom through the first biofilm filter 1. The sewage undergoes primary filtration pretreatment in the first biofilm filter 1 to remove most of the suspended solids and organic matter. At the same time, the first biofilm filter 1 also utilizes the action of denitrifying bacteria in an anaerobic environment to achieve the effects of denitrification, denitrification, dephosphorization and removal of organic matter.

[0031] After being treated by the first biofilm filter 1, the sewage continues to enter the second biofilm filter 2 from bottom to top. Since the second biofilm filter 2 is supplied with oxygen through the aeration pipe 4, the second biofilm filter 2 has an aerobic environment, and the nitrifying bacteria in the second biofilm filter 2 nitrify the ammonia nitrogen in the sewage into nitrate, further reducing the nitrogen content in the sewage. If it is necessary to further remove the total phosphorus and total nitrogen in the sewage so that the water quality reaches a higher discharge standard, the flocculant can be added at the output end of the second biofilm filter 2 through the flocculant delivery mechanism 16 and the carbon source delivery mechanism 17, so that the sewage is filtered through micro-flocculation to further remove phosphorus, and the carbon source is added to further remove the total nitrogen by anoxic denitrification.

[0032] Finally, the sewage flows from top to bottom through the third biofilm filter 3, and the remaining suspended solids and phosphorus in the sewage are further removed by the third biofilm filter 3, ensuring that the water quality of the filtered water discharged from the outlet pipe 13 meets the discharge standard.

[0033] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. An integrated device for rural sewage treatment, characterized in that: The invention comprises a first biofilm filter, a second biofilm filter, a third biofilm filter and an aeration pipe, wherein the first biofilm filter, the second biofilm filter and the third biofilm filter are arranged in sequence on the left and right, an input end of the first biofilm filter is provided with an inlet pipe, and the inlet pipe is used to be connected to a sewage lifting pump, an output end of the first biofilm filter is connected to the input end of the second biofilm filter, an output end of the second biofilm filter is connected to the input end of the third biofilm filter, an outlet pipe is provided at the output end of the third biofilm filter, water flow directions of the first biofilm filter and the third biofilm filter are both from top to bottom, and water flow direction of the second biofilm filter is from bottom to top; the aeration pipe is used to be connected to an aeration blower, and the aeration pipe extends to the bottom of the second biofilm filter; the first biofilm filter, the second biofilm filter and the third biofilm filter are all filled with floating filter materials, and the first biofilm filter, the second biofilm filter and the third biofilm filter are all tower biofilters.

2. The integrated device for rural sewage treatment according to claim 1, characterized in that: It also includes a water inlet pool and a grid filter structure. The water inlet pool is arranged above the first biofilm filter, the water inlet pool is connected to the input end of the first biofilm filter, the grid filter structure is horizontally arranged in the water inlet pool, and the water inlet pipe is located above the grid filter structure.

3. The integrated device for rural sewage treatment according to claim 2, characterized in that: The mesh size of the grid filter structure is 2.5 mm.

4. The integrated device for rural sewage treatment according to claim 1, characterized in that: It also includes a first water distribution structure and a second water distribution structure. The first water distribution structure is arranged at the bottom of the first biofilm filter and the second biofilm filter, and the first water distribution structure is respectively connected to the first biofilm filter and the second biofilm filter. The second water distribution structure is arranged at the bottom of the third biofilm filter, and the second water distribution structure is respectively connected to the third biofilm filter and the outlet pipe.

5. The integrated device for rural sewage treatment according to claim 2, characterized in that: It also includes a third water distribution structure and a return water pipe. The third water distribution structure is arranged above the second biofilm filter. The third water distribution structure is respectively connected with the second biofilm filter, the third biofilm filter and one end of the return water pipe. The other end of the return water pipe is connected with the water inlet tank. There is a height difference between the top of the second biofilm filter and the top of the third biofilm filter.

6. The integrated device for rural sewage treatment according to claim 1, characterized in that: It also includes a flocculant delivery mechanism, which is connected to the output end of the second biofilm filter and is used for delivering flocculants.

7. The integrated device for rural sewage treatment according to claim 1, characterized in that: It also includes a carbon source delivery mechanism, which is connected to the output end of the second biofilm filter and is used for delivering the carbon source.

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