A combined ecological pond process and system for treating rural domestic sewage

Abstract

The invention discloses a combined ecological pond system for treating rural domestic sewage, comprising: a filter dam, which is connected to a sequencing batch reactor through an inlet channel and is arranged at the inlet of the ecological pond; an enhanced phosphorus removal filler, which is laid at the boundary of the water surface of the ecological pond; and a lake purifier, a flow-pushing device using a flow-pushing pump and aquatic plants are arranged in the ecological pond. The process of the invention is relatively short, and the pollutant buffering and reduction effects of the enhanced natural ecological pond are fully utilized to achieve the effect of adapting measures to local conditions and having outstanding functions; after the enhanced ecological pond is built, the infrastructure measures are effective for a long time, the requirements for daily maintenance are low, and the effluent water quality is stable; the adopted system can form a landscape sketch while completing the sewage purification, and the built ecological pond constitutes a set of micro-ecological environment.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a combined ecological pond process and system for treating rural domestic sewage. Background Art

[0002] In recent years, my country has increased its investment in rural areas, including improvement of living environment, environmental restoration and governance, and beautiful countryside construction. In particular, in the field of rural water environment governance, new water environment governance projects represented by decentralized sewage treatment plants and toilet renovation projects have been gradually built.

[0003] However, at present, most of the treatment projects in rural areas still use the technology of urban sewage treatment, which is complex in design, difficult to operate and maintain, and has the problem of acclimatization. Many environmental protection enterprises and scientific research institutions also attach great importance to the problem of sewage treatment in rural areas, and have put forward many constructive treatment ideas. Invention CN 101948214B provides a treatment technology and system combining artificial wetlands and shallow ecological ponds for rural sewage treatment. Although rural areas have the basic conditions for building artificial wetlands, the construction cost of artificial wetlands is high, the operation and maintenance requirements are high, and the amount of domestic sewage in rural areas fluctuates greatly seasonally and cyclically. Therefore, it is difficult to achieve long-term stable operation of artificial wetlands in rural areas;

[0004] The advantages of water environment management and restoration in rural areas are: there are more optional management sites, including many naturally existing ponds; the daily sewage generation is low, and the treatment load of facilities and equipment does not need to be too high.

[0005] There are also inherent deficiencies in water environment management and restoration in rural areas: lack of sewage treatment professionals and maintenance personnel;

[0006] Based on the basic situation in rural areas, the sewage treatment needs are summarized as follows: (1) simple facility management and low operation and maintenance costs; (2) adapting to the characteristics of rural domestic sewage with small water volume and large seasonal changes; (3) taking appropriate measures to fully utilize and strengthen the existing ecological ponds, ecological channels and other natural terrains in rural areas to absorb pollutants in sewage. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of high construction cost and high operation and maintenance requirements of artificial wetlands in rural areas, large seasonal and periodic fluctuations in the amount of domestic sewage in rural areas, and difficulty in achieving long-term stable operation of artificial wetlands, and to propose a combined ecological pond process and system for treating rural domestic sewage.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A combined ecological pond system for treating rural domestic sewage, comprising:

[0010] The filter dam is connected to the sequencing batch reactor tank through an inlet channel and is arranged at the inlet of the ecological pond;

[0011] Enhanced phosphorus removal filler, laid at the boundary of the ecological pond water surface;

[0012] In addition, a lake purifier, a flow-pushing device using a flow-pushing pump, and aquatic plants are arranged in the ecological pond.

[0013] As a further solution of the present invention: the filter dam is a porous brick-like structure filled with ecological materials; the filter dam is arranged at a height higher than the horizontal liquid level of the ecological pond.

[0014] As a further solution of the present invention: the enhanced phosphorus removal filler is mainly made of cement, quicklime, fly ash sand and aluminum powder to make a porous lightweight concrete material.

[0015] As a further solution of the present invention: the compressive strength of the reinforced phosphorus removal filler is greater than 10 MPa, the porosity is 20-25%, and the pH value of the pore water environment of the material is less than 10.

[0016] As a further solution of the present invention: the lake purifier includes a mounted soft filler, and the filler mounting area accounts for 1 / 40-1 / 60 of the ecological pond.

[0017] As a further solution of the present invention: in the initial stage of the ecological pond construction, the aeration time of the lake purifier filling area is not less than 16 hours per day.

[0018] As a further solution of the present invention: after the biofilm is formed, the aeration time of the lake purifier is 6-8 hours per day.

[0019] As a further solution of the present invention: the flow-pushing device further comprises:

[0020] The buoyancy box is connected to the lifting frame through a lead screw;

[0021] A flow-pushing assembly, the array of which is arranged on a lifting frame, and includes flow-pushing blades connected to a flow-pushing motor;

[0022] The telescopic member comprises a movable rod and a telescopic rod, the flow-pushing motor is connected to the lifting frame via the telescopic rod, one end of the movable rod is connected to the flow-pushing motor, and the other end is connected to the buoyancy box.

[0023] As a further solution of the present invention: the flow-pushing assembly includes a housing:

[0024] A first frame is provided in the shell, and a flow-pushing motor is provided on the first frame, wherein an output end on one side of the flow-pushing motor is connected to a flow-pushing blade, and an output end on the other side of the flow-pushing motor is connected to a worm gear;

[0025] The second frame is provided with a first gear and a second gear, which are meshed and connected. A worm wheel is connected to the bottom of the first gear, which is meshed and connected to the worm. The second frame is connected to the top seat through a connecting rod.

[0026] A combined ecological pond process for treating rural domestic sewage mainly comprises a sewage biochemical treatment step and an enhanced ecological pond treatment step, and specifically comprises the following steps:

[0027] Step 1: The steps of sewage biochemical treatment are as follows: domestic sewage is collected through the pipe network and enters the collection tank, flows by gravity into the grid well to intercept suspended solids, and then flows by gravity into the regulating tank. The sewage in the regulating tank is lifted by a pump and enters the sequencing batch reactor for anaerobic hydrolysis treatment;

[0028] Step 2: The enhanced ecological pond treatment steps are as follows: the sewage after batch treatment is precipitated and adsorbed in the area surrounded by the filter dam; and enters the enhanced ecological pond for treatment; by enhancing the biofilm microorganisms, photosynthesis and metabolism of aquatic plants, and feeding of aquatic animals in the ecological pond, the migration and transformation of substances in the food chain are completed, and finally the degradation and transformation of organic matter and nutrients in the water are completed; phosphorus is removed by strengthening the laying of phosphorus removal fillers along the coast and the circulating hydrodynamic measures of the flow-pushing device.

[0029] Beneficial effects of the present invention:

[0030] The process flow of the present invention is relatively short, and the pollutant buffering and reduction effect of the natural ecological pond after strengthening is fully utilized to achieve the effect of adapting measures to local conditions and outstanding functions; after the strengthening ecological pond is built, the infrastructure measures are effective for a long time, the requirements for daily maintenance are low, and the effluent water quality is stable; the system used can form a landscape while completing the sewage purification, and the ecological pond after construction constitutes a set of micro-ecological environment;

[0031] And through the improved flow-pushing device, the flow-pushing blades can complete continuous reciprocating rotation in the X-axis, Y-axis and Z-axis directions, which will greatly increase the flow-pushing area, make the water area have good fluidity, and thus improve its sewage treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Figure 1 It is a schematic diagram of the structure of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the flow pushing device of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the connection relationship between the floating box and the lifting frame of the present invention;

[0036] Figure 4It is a structural schematic diagram of the connection relationship between the lifting frame and the telescopic rod of the present invention;

[0037] Figure 5 It is a structural schematic diagram of the flow-pushing component of the present invention.

[0038] In the figure: 1. Inlet channel; 2. Filter dam; 3. Eco-pond water surface boundary; 4. Enhanced phosphorus removal filler; 5. Lake purifier; 6. Outlet channel; 7. Flow-pushing device; 8. Aquatic plants;

[0039] 71. buoyancy box; 72. column; 73. base; 74. lifting frame; 75. limit frame; 76. screw rod; 77. sleeve; 78. movable rod; 79. telescopic rod; 710. mounting seat; 711. flow-pushing assembly; 7111. top seat; 7112. first frame; 7113. flow-pushing motor; 7114. connecting shaft; 7115. worm; 7116. worm wheel; 7117. second frame; 7118. connecting rod; 7119. first gear; 71110. second gear. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] See also Figure 1 As shown, the present invention is a combined ecological pond system for treating rural domestic sewage, comprising an inlet channel 1, a filter dam 2, an ecological pond water surface boundary 3, an enhanced phosphorus removal filler 4, a lake purifier 5, an outlet channel 6, a flow-pushing device 7, and aquatic plants 8;

[0043] The filter dam 2 is connected to the sequencing batch reactor through the water inlet channel 1. The filter dam 2 is set at the water inlet of the ecological pond. An enhanced phosphorus removal filler 4 is set at the water surface boundary 3 of the ecological pond. A lake purifier 5, a flow-pushing device 7 and aquatic plants 8 are set in the ecological pond; the aquatic plants 8 are planted in the ecological pond and along the coast, and aquatic animals are also placed in the ecological pond; the flow-pushing device 7 can use a flow-pushing pump; the flow-pushing pump is installed at the water outlet channel 6 of the ecological pond, and the flow-pushing direction is toward the water inlet channel 1 of the ecological pond; the depth of the ecological pond is 1.5-2 meters; the water flow residence time of the treated domestic sewage in the ecological pond is controlled to be 4-20 days;

[0044] The filter dam 2 is a brick-like structure filled with porous ecological materials, which settles and adsorbs the suspended organic matter in the water of the ecological pond; the filter dam 2 is set at a height higher than the horizontal liquid level of the ecological pond, and multiple filter dams 2 are set, and the horizontal distance between two filter dams 2 is 1 / 100-1 / 150 of the daily water treatment volume (tons / day);

[0045] Lake purifier 5, adds a sewage treatment system characterized by biological contact oxidation process in the ecological pond, increases the aeration volume of the ecological pond, and further degrades the dissolved organic matter under the joint action of biofilm and aquatic plants and animals; the lake purifier 5 includes mounted soft fillers and bottom aeration devices, and the filler mounting area accounts for 1 / 40-1 / 60 of the ecological pond; in the early stage of the ecological pond, the aeration time of the filler area of ​​the lake purifier 5 is not less than 16 hours per day; after the biofilm is formed, the aeration time is adjusted to 18:00-6:00 the next day, and the aeration time can be shortened to 6-8 hours per day;

[0046] Water ecological vegetation and aquatic animals are formed by planting aquatic crops and adding aquatic animals in ecological ponds to form a complete micro-ecological system; the micro-ecological system uses the mutual restraint between organisms to modify water quality, and uses the food chain relationship to effectively recycle and utilize resources to achieve water purification and resource utilization;

[0047] Aquatic plants 8 include emergent plants and submerged plants. The emergent plants are local native plants such as canna, iris, and lily, and the submerged plants are black algae, elodea, and foxtail algae.

[0048] Aquatic animals include benthic mollusks such as copper-rust ring shells and pear-shaped ring shells, and feeding fish such as grass carp and silver carp.

[0049] Enhanced phosphorus removal filler 4, a filter dam filled with ecological phosphorus removal materials prepared with calcium-aluminum ore as the core, settles and intercepts the total phosphorus and suspended organic matter in the ecological pond inlet; the enhanced phosphorus removal filler 4 is made of cement, quicklime, fly ash sand, aluminum powder and other materials according to a specific processing method to make a porous lightweight concrete material with a compressive strength greater than 10MPa, a porosity of 20-25%, and a material pore water environment pH less than 10;

[0050] The flow-pushing device 7 is a device for increasing the water circulation in the pond, thereby improving the treatment efficiency including the lake purifier 5 and the enhanced phosphorus removal filler 4.

[0051] Example 2

[0052] Based on the above-mentioned embodiment 1, a combined ecological pond process for treating rural domestic sewage mainly consists of a sewage biochemical treatment step and an enhanced ecological pond treatment step, and specifically includes the following steps:

[0053] Step 1: The steps of sewage biochemical treatment are as follows: domestic sewage is collected through the pipe network and enters the collection tank, flows by gravity into the grille well to intercept large pieces of suspended solids, and then flows by gravity into the regulating tank. The sewage in the regulating tank is lifted by a pump and enters the sequencing batch reactor. After anaerobic hydrolysis treatment, the macromolecular long-chain or cyclic organic matter is degraded into small molecular compounds by the action of anaerobic bacteria or facultative bacteria. After the anaerobic hydrolysis treatment is completed, aeration is performed, and the small molecular compounds are further metabolized, synthesized or degraded by aerobic bacteria. The effluent after the reaction is treated in the next step;

[0054] Step 2: The enhanced ecological pond treatment step is as follows: the sewage after batch treatment uses the area surrounded by the filter dam 2, and the sewage flows through the pores of the filter dam filled with porous filter materials, and is precipitated and adsorbed in the filter dam area; the interception in the filter dam area further settles other insoluble suspended matter in the water, improves the water quality transparency, and the sewage passing through the filter dam 2 enters the enhanced ecological pond for treatment;

[0055] The infiltrate treated by the filter dam 2 is further treated by an enhanced ecological pond, which includes biological biofilm fillers and aeration devices, a complete aquatic plant and animal system, enhanced phosphorus removal fillers 4, and a flow-pushing device 7. By enhancing the biofilm microorganisms, photosynthesis and metabolism of aquatic plants 8, and feeding of aquatic animals in the ecological pond, the migration and transformation of substances in the food chain are completed, and finally the degradation and transformation of organic matter and nutrients in the water are completed. By laying the enhanced phosphorus removal fillers 4 along the coast and the circulating hydrodynamic measures of the flow-pushing device 7, phosphorus is further removed and water quality indicators are stabilized.

[0056] Example 3

[0057] See also Figure 2-5 As shown, based on the above embodiment 1, a flow-pushing pump is used to act on the ecological pond to improve the fluidity of the water in the ecological pond. However, the flow-pushing pump has a small action area and a limited action depth, which will lead to poor fluidity of the ecological pond. Therefore, improvements are made to the flow-pushing device 7.

[0058] The flow-pushing device 7 comprises a buoyancy box 71; four columns 72 are arranged in a rectangular array on the bottom surface of the buoyancy box 71, and a lifting frame 74 is sleeved on the column 72. The lifting frame 74 is connected to a screw mechanism installed on the buoyancy box 71, and the bottom end of the column 72 is installed on a base 73. Flow-pushing components 711 are arranged at the four corners of the lifting frame 74;

[0059] The buoyancy box 71 enables the flow-pushing device 7 to float on the water surface. The screw mechanism includes a drive motor and a screw rod 76. The drive motor is arranged on the buoyancy box 71, and the output end of the drive motor is connected to the screw rod 76. The screw rod 76 is sleeved with a sleeve 77, and the sleeve 77 is connected to the lifting frame 74.

[0060] Limiting frames 75 are respectively arranged on the upper and lower sides of the lifting frame 74. The limiting frames 75 move up and down along the pillars 72. Limiting wheels are arranged inside the limiting frames 75. The setting of the limiting frames 75 plays a role in limiting and stabilizing the movement of the lifting frame 74.

[0061] The flow-pushing assembly 711 includes a top seat 7111, which is mounted on a lifting frame 74. A shell is rotatably mounted on the bottom of the top seat 7111. A first frame 7112 is disposed in the shell. A flow-pushing motor 7113 is disposed on the first frame 7112. An output end on one side of the flow-pushing motor 7113 is connected to a flow-pushing blade, which is located outside the shell. An output end on the other side of the flow-pushing motor 7113 is connected to a worm 7115.

[0062] The second frame 7117 is provided with a first gear 7119 and a second gear 71110, which are meshed and connected. A worm wheel 7116 is connected to the bottom of the first gear 7119, which is meshed and connected to the worm 7115. The second frame 7117 is connected to the top seat 7111 via a connecting rod 7118.

[0063] When working, the flow-pushing motor 7113 is started to drive the flow-pushing blades and the worm 7115 to rotate. The worm 7115 drives the housing to rotate back and forth along the top seat 7111 through the worm wheel 7116, the first gear 7119, the second gear 71110 and the connecting rod 7118, so that the flow-pushing blades will also rotate back and forth while rotating, and then the flow-pushing effect area will be greatly increased, so that the water area has a good flow-pushing effect on the horizontal plane;

[0064] At the same time, the driving motor drives the screw rod 76 to rotate, so that the lifting frame 74 moves up and down along the screw rod 76, so that the flow-pushing component 711 on the lifting frame 74 also moves up and down, so that the flow-pushing blades rotate back and forth continuously during the up and down movement, which will further improve its flow-pushing effect;

[0065] Preferably, the flow-pushing assembly 711 is connected to the bottom surface of the buoyancy box 71 through a telescopic member, and the telescopic member includes a movable rod 78, a telescopic rod 79, and a mounting seat 710. One end of the telescopic rod 79 is connected to the lifting frame 74, and the other end of the telescopic rod 79 is connected to the mounting seat 710. The mounting seat 710 is connected to the top seat 7111, and the top of the mounting seat 710 is connected to one end of the movable rod 78, and the other end of the movable rod 78 is connected to the bottom surface of the buoyancy box 71.

[0066] During operation, when the lifting frame 74 moves up and down, the cooperation between the movable rod 78 and the telescopic rod 79 causes the flow-pushing assembly 711 on the mounting seat 710 to continuously move back and forth along the telescopic rod 79, thereby further increasing the effective area of ​​the flow-pushing blades in the above-mentioned working process;

[0067] Therefore, the specific working process of the flow-pushing device 7 is as follows:

[0068] The driving motor drives the screw rod 76 to rotate, so that the lifting frame 74 moves up and down along the screw rod 76, so that the flow-pushing assembly 711 on the lifting frame 74 also moves up and down;

[0069] At the same time, the flow-pushing motor 7113 drives the flow-pushing blades and the worm 7115 to rotate, and the worm 7115 drives the housing to rotate back and forth along the top seat 7111 continuously through the worm wheel 7116, the first gear 7119, the second gear 71110 and the connecting rod 7118;

[0070] Furthermore, through the cooperation between the movable rod 78 and the telescopic rod 79, the flow-pushing assembly 711 on the mounting seat 710 will continuously move back and forth along the telescopic rod 79;

[0071] In summary, the flow-pushing device 7 will enable the flow-pushing blades to rotate back and forth continuously in the directions of the X-axis, Y-axis and Z-axis, which will greatly increase the flow-pushing area, make the water area have good fluidity, and thus improve its sewage treatment efficiency.

[0072] Working principle of the present invention: The process flow of this process is relatively short, and the pollutant buffering and reduction effect of the natural ecological pond after strengthening is fully utilized to achieve the effect of adapting measures to local conditions and outstanding functions; after the strengthening ecological pond is built, the infrastructure measures are effective for a long time, the requirements for daily maintenance are low, and the effluent water quality is stable; the system used can form a landscape while completing the sewage purification, and the ecological pond after completion constitutes a set of micro-ecological environment;

[0073] And through the improved flow-pushing device 7, the flow-pushing blades can complete continuous reciprocating rotation in the X-axis, Y-axis and Z-axis directions, which will greatly increase the flow-pushing area, make the water area have good fluidity, and thus improve its sewage treatment efficiency.

[0074] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A combined ecological pond system for treating rural domestic sewage, It is characterized in that include: The filter dam (2) is connected to the sequencing batch reactor through the water inlet channel (1) and is arranged at the water inlet of the ecological pond; Enhanced phosphorus removal filler (4) is laid at the boundary (3) of the ecological pond water surface; Furthermore, a lake purifier (5), a flow-pushing device (7) using a flow-pushing pump, and aquatic plants (8) are arranged in the ecological pond; The lake purifier (5) includes a mounted soft filler, and the mounting area of ​​the soft filler accounts for 1 / 40-1 / 60 of the area of ​​the ecological pond; The flow-pushing device (7) further comprises: The floating box (71) is connected to the lifting frame (74) via a lead screw; The flow-pushing assembly (711) is arranged in an array on the lifting frame (74), and includes flow-pushing blades connected to the flow-pushing motor (7113); The telescopic member comprises a movable rod (78) and a telescopic rod (79), the flow-pushing motor (7113) is connected to the lifting frame (74) via the telescopic rod (79), one end of the movable rod (78) is connected to the flow-pushing motor (7113), and the other end is connected to the buoyancy box (71); The flow-pushing assembly (711) comprises a housing: A first frame (7112) is arranged in the shell, and a flow-pushing motor (7113) is arranged on the first frame (7112); an output end on one side of the flow-pushing motor (7113) is connected to a flow-pushing blade, and an output end on the other side is connected to a worm (7115); The second frame (7117) is provided with a first gear (7119) and a second gear (71110), the first gear (7119) and the second gear (71110) are meshingly connected, the bottom of the first gear (7119) is connected with a worm wheel (7116), the worm wheel (7116) is meshingly connected with the worm (7115), and the second frame (7117) is connected to the top seat (7111) through a connecting rod (7118).

2. A combined ecological pond system for treating rural domestic sewage according to claim 1, It is characterized in that The filter dam (2) is a porous brick-like structure filled with ecological materials; the height of the filter dam (2) is higher than the liquid level of the ecological pond.

3. A combined ecological pond system for treating rural domestic sewage according to claim 1, It is characterized in that The enhanced phosphorus removal filler (4) is a porous lightweight concrete material mainly made of cement, quicklime, fly ash sand and aluminum powder.

4. A combined ecological pond system for treating rural domestic sewage according to claim 3, It is characterized in that The compressive strength of the enhanced phosphorus removal filler (4) is greater than 10 MPa, the porosity is 20-25%, and the pH value of the pore water environment of the material is less than 10.

5. A combined ecological pond system for treating rural domestic sewage according to claim 1, It is characterized in that In the initial stage of the ecological pond construction, the aeration time of the fill area of ​​the lake purifier (5) shall not be less than 16 hours per day.

6. A combined ecological pond system for treating rural domestic sewage according to claim 5, It is characterized in that After the biofilm is formed, the aeration time of the lake purifier (5) is 6-8 hours per day.

7. A combined ecological pond process for treating rural domestic sewage according to the combined ecological pond system for treating rural domestic sewage according to any one of claims 1 to 6, It is characterized in that It mainly consists of sewage biochemical treatment steps and enhanced ecological pond treatment steps, specifically including the following steps: Step 1: The steps of sewage biochemical treatment are as follows: domestic sewage is collected through the pipe network and enters the collection tank, flows by gravity into the grid well to intercept suspended solids, and then flows by gravity into the regulating tank. The sewage in the regulating tank is lifted by a pump and enters the sequencing batch reactor for anaerobic hydrolysis treatment; Step 2: The enhanced ecological pond treatment steps are as follows: the sewage after batch treatment is precipitated and adsorbed in the area surrounded by the filter dam (2); and enters the enhanced ecological pond for treatment; by enhancing the biofilm microorganisms, photosynthesis and metabolism of aquatic plants (8), and feeding of aquatic animals in the ecological pond, the migration and transformation of substances in the food chain are completed, and finally the degradation and transformation of organic matter and nutrients in the water are completed; phosphorus is removed by strengthening the phosphorus removal filler (4) laid along the coast and the circulating water power of the flow-pushing device (7).

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