A rice field end water drainage treatment system and treatment process

Abstract

The application provides a rice field tail water discharge treatment system and treatment process, and relates to the technical field of tail water treatment. The system comprises an integrated interception device, a first interception zone, and a mud baffle formed around the first interception zone filled with gravel. A tail water discharge pipe is arranged between the mud baffle and the rice field. The integrated interception device comprises a second interception zone, a third interception zone, a backwashing and discharge device, a floating filter unit one arranged in the second interception zone, a water inlet pipe arranged between the upper part of the floating filter unit one and the first interception zone, a floating filter unit two arranged in the third interception zone, a transfer pipe arranged between the lower part of the floating filter unit two and the floating filter unit one, the lower part of the floating filter unit two being further connected to the backwashing and discharge device, and a water outlet pipe arranged between the upper part of the floating filter unit two and the outside. The application makes full use of the ability of the rice field to utilize and degrade nitrogen and phosphorus, and discharges the tail water of the rice field into the first interception zone and the integrated interception device for three-stage filtration without affecting rice production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tail water treatment, and particularly relates to a rice field end water discharge treatment system and treatment process. BACKGROUND

[0002] In rice fields, after water body fertilization or rain, rainwater hits the ground and forms a mud mixture, and the nitrogen and phosphorus in the surface layer are washed away, which can quickly increase the concentration of nitrogen and phosphorus in the water body, possibly leading to water body eutrophication, which has an adverse impact on the ecological environment and rice growth. There are several general treatment methods as follows:

[0003] Plant belt and wetland filtration: Establishing a plant belt or wetland around the water body, wetland plants usually have good absorption capacity for nitrogen and phosphorus, and these areas can play a filtering role, reducing the concentration of nitrogen and phosphorus through the absorption of plants and the filtering effect of soil.

[0004] Water flow management: Adjusting the flow of the water body can help reduce the concentration of nitrogen and phosphorus in the water body. For example, by changing the flow direction of the water body, increasing the stagnant time of the water body, etc., slowing down the water flow rate helps to precipitate and deposit suspended particles, reducing the flushing of nitrogen and phosphorus.

[0005] Chemical precipitant: Using appropriate chemical precipitants such as ferric hydroxide, ferric sulfate, etc. can help form a precipitate of phosphorus in the water, thereby reducing the concentration of phosphorus in the water body.

[0006] Biological treatment: Introducing some organisms that can adsorb and absorb nitrogen and phosphorus, such as aquatic plants and microorganisms, to promote the biological degradation and absorption of nitrogen and phosphorus.

[0007] The plant belt and wetland filtration method requires a large land area, and the effect may not be fast enough. The use of chemical precipitants may have a negative impact on the water body ecosystem. The biological treatment method is relatively slow and requires a certain period of time to establish and maintain an appropriate ecosystem.

[0008] Compared with the water flow management, the water flow management can slow down the water flow, help the sedimentation and deposition of particles, and reduce the concentration of nitrogen and phosphorus. However, in heavy rain, the concentration of water nitrogen and phosphorus in the paddy field will increase rapidly, and the tail water in the paddy field contains a large amount of nitrogen and phosphorus, which accounts for more than 50-60%. According to the above system, the tail water in the paddy field is directly discharged into the nitrogen and phosphorus filter device and the plant filter layer, and the nitrogen and phosphorus filter device and the plant filter layer are filtered at the same time. The concentration of nitrogen and phosphorus in the filtered water is still high, which leads to the pollution of the discharged water.

[0009] However, in heavy rain, the concentration of water nitrogen and phosphorus in the paddy field will increase rapidly, and the tail water in the paddy field contains a large amount of nitrogen and phosphorus, which accounts for more than 50-60%. According to the above system, the tail water in the paddy field is directly discharged into the nitrogen and phosphorus filter device and the plant filter layer, and the nitrogen and phosphorus filter device and the plant filter layer are filtered at the same time. The concentration of nitrogen and phosphorus in the filtered water is still high, which leads to the pollution of the discharged water.

[0010] Therefore, there is room for improvement, and the present application provides a paddy field end water discharge treatment system and treatment process. SUMMARY

[0011] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a paddy field end water discharge treatment system, and the specific scheme is as follows:

[0012] A paddy field end water discharge treatment system, the discharge treatment system comprises: an integrated interception device detachably installed at the end of the paddy field and a first interception zone arranged between the integrated interception device and the end of the paddy field, wherein,

[0013] The first interception zone is filled with gravel, and plants that can absorb nitrogen and phosphorus are planted on the top of the gravel. A mud retaining ridge higher than the paddy field is formed around the first interception zone, and a tail water outlet pipe is arranged between the mud retaining ridge and the paddy field;

[0014] The integrated interception device is provided with a second interception zone and a third interception zone, and a backwashing and discharge device is arranged on one side of the integrated interception device close to the third interception zone, wherein,

[0015] The second interception zone is provided with a floating filter unit one, and a water inlet pipe is arranged between the upper part of the second interception zone and the first interception zone;

[0016] The tertiary interception zone is provided with a floating filter unit two, a transit pipe is arranged in communication between the lower part of the floating filter unit two and the floating filter unit one, and the lower part is further provided in communication with a backwashing and discharging device, and the upper part is provided in communication with the outside through a drain pipe;

[0017] The tail water guide pipe, the water inlet pipe and the drain pipe are each provided with an opening and closing automatic control member;

[0018] The backwashing and discharging device is used for completing backwashing and discharging operations in the secondary interception zone and the tertiary interception zone respectively.

[0019] Therefore, after the fertilized paddy field is washed by a rainstorm, the tail water is allowed to deposit in the paddy field for 24-36 hours to realize in-situ purification under the condition that the tail water guide pipe is not working, and the tail water at the end of the paddy field enters the primary interception zone, and is deposited while the water is intercepted by the rice roots and the gravel planted in the primary interception zone, and is absorbed and converted by the rice under the condition that the water inlet pipe is not working.

[0020] Then, the opening and closing automatic control member controls the water inlet pipe to be opened, the tail water enters the secondary interception zone of the integrated interception device from the primary interception zone, and the tail water falls from the upper part to be further intercepted by the floating filter unit one to realize filtration.

[0021] Then, the tail water enters the tertiary interception zone from the lower part of the secondary interception zone to be further intercepted by the floating filter unit two to realize filtration.

[0022] After the discharge treatment system is operated for a period of time, the particles, the sludge and the impurities will be deposited to a certain thickness at the bottom of the tertiary interception zone, the particles, the sludge and the impurities with high concentration may cause the transit pipe to be blocked, the backwashing and discharging device can be operated to add water in the secondary interception zone and the tertiary interception zone to drive the floating filter unit one and the floating filter unit two to float and wash the floating filter unit one and the floating filter unit two, expand the movement space of the bottom, and make the particles, the sludge and the impurities in the secondary interception zone and the tertiary interception zone roll, so that the particles, the sludge and the impurities in the movement state can be discharged from the tertiary interception zone by the backwashing and discharging device.

[0023] Further, the primary interception zone is a groove structure independent of the paddy field, the bottom of the groove structure is lower than the bottom of the paddy field, and a tail water guide outlet is formed between the paddy field and the groove structure;

[0024] The groove structure is provided with at least two groups of flexible mesh bags, and the flexible mesh bags are filled with the gravel.

[0025] Thus, the first interception area is convenient to install and has low overall cost, and the gravel and flexible net bag are convenient to replace, and after the tail water in the rice field flows into the first interception area from the tail water outlet, the rice roots and the gravel intercept the particles such as soil rich in nitrogen and phosphorus in the water body, and the rice absorbs and converts them.

[0026] Further, the tail water outlet is arranged in the mud ridge and is connected with the first interception area, and the tail water outlet is fixed with a tail water outlet pipe.

[0027] The bottom of the tail water outlet pipe and the bottom of the rice field are in the same plane.

[0028] Thus, the tail water in the rice field can enter the first interception area gently, preventing overflow too fast and preventing the tail water from being uninterrupted, which leads to the first interception area being saturated too fast.

[0029] Further, the first floating filter unit and the second floating filter unit have the same structure.

[0030] The second floating filter unit comprises an upper compaction layer and a lower floating layer.

[0031] The lower floating layer is filled with floating filler inside and is arranged below the drain pipe or the water inlet pipe and has a deformation capacity to fill each part of the second interception area and the third interception area.

[0032] The upper compaction layer is arranged above the drain pipe or the water inlet pipe, and the lower compaction layer and the bottom of the second interception area and the third interception area are in a close state.

[0033] Thus, the lower floating layer can be arranged at the bottom of the second interception area and the third interception area under the action of the upper compaction layer, thereby realizing the filtration of the water body.

[0034] Further, the number of the lower floating layers is at least two, and the weight of each lower floating layer is less than 20 kg.

[0035] The floating filler has a particle size of 20-30 mm and a density of less than 0.8 kg / L, and has pores on the surface.

[0036] The filling degree of the filter screen is less than or equal to 70%.

[0037] Further, the upper compaction layer is filled with zeolite inside and can slide up and down relative to the inner wall of the second interception area and the third interception area, and one side of the upper compaction layer is detachably locked with the inner wall of the second interception area and the third interception area.

[0038] Thus, the upper compaction layer can be lifted relative to the second interception area and the third interception area to increase the space, and the lower floating layer can float, thereby facilitating the work of the backwashing and discharge device.

[0039] Further, the upper compaction layer is provided with a compaction plate, one side of which is hinged to the inner wall of the secondary interception zone and the tertiary interception zone, and the other side is detachably locked to the inner wall of the secondary interception zone and the tertiary interception zone.

[0040] Thus, the upper compaction layer can be flipped relative to the secondary interception zone and the tertiary interception zone to increase the space, and the lower floating layer can float, thereby facilitating the work of the backwashing and discharging device.

[0041] Further, the backwashing and discharging device comprises a backwashing filter, a particle discharging pipe, a backwashing pump and a control valve.

[0042] The interface at one end of the backwashing filter is horizontally provided through the bottom of the integrated interception device, the interface at the other end of the backwashing filter is in communication with the backwashing pump, and the control valve is installed between the backwashing filter and the backwashing pump.

[0043] The backwashing filter is further provided with the particle discharging pipe in communication, and the control valve is installed on the particle discharging pipe.

[0044] Thus, the backwashing filter can add water to the tertiary interception zone, when the floating filter unit II is no longer at the bottom of the tertiary interception zone, the particles roll over until the particle discharging pipe discharges the particles from the tertiary interception zone. At the same time, since the tertiary interception zone is in communication with the secondary interception zone, the particles at the bottom of the secondary interception zone can also be discharged.

[0045] Further, the integrated interception device is provided with an ecological ditch on the same side of the backwashing and discharging device, and the interception dam is installed in the ecological ditch.

[0046] The ecological ditch is used to collect the water discharged from the backwashing and discharging device and the drain pipe, and is also used to supply water to the paddy field and the backwashing and discharging device.

[0047] Another object of the present application is to provide a paddy field end water discharge treatment process, and the specific scheme is as follows:

[0048] A paddy field end water discharge treatment process, the treatment process is:

[0049] First, let the tail water purify in situ in the paddy field for 24-36 hours, at the same time, install the paddy field end water discharge treatment system in claim 9 at the end of the paddy field, and the mud dam plays a blocking role;

[0050] Then, the opening and closing automatic control member controls the tail water guide pipe to open, and the tail water gradually enters the primary interception zone from the tail water guide pipe, and the tail water is filtered once in the primary interception zone.

[0051] After that, the open and close automatic control member controls the water inlet pipe to open, and the tail water in the first interception area (1) enters the second interception area of the integrated interception device, and the tail water is intercepted by the floating filter unit one, to realize secondary filtration;

[0052] After that, the tail water enters the third interception area from the lower part of the second interception area, and the water body is intercepted by the floating filter unit two, to realize tertiary filtration, and the filtered tail water is discharged into the ecological ditch;

[0053] After the discharge treatment system runs for 1-2 months, the backwashing and discharging device is controlled to work, and the locking position of the upper compaction layer is opened, the backwashing and discharging device adds water in the second interception area and the third interception area, drives the floating filter unit one and the floating filter unit two to float and wash the floating filter unit one and the floating filter unit two, and drives the floating filler to tumble, until the water in the second interception area and the third interception area is discharged into the ecological ditch by the backwashing and discharging device;

[0054] When the rice field needs to be irrigated, the water body loaded with nitrogen and phosphorus in the ecological ditch is pumped into the rice field by the water pumping device, to provide nutrients for the rice field.

[0055] Compared with the prior art, the beneficial effects of the present application are as follows:

[0056] (1) The present application sets the first interception area and the integrated interception device, the first interception area is the area of the plant belt and the wetland filtration method, and the integrated interception device is the device adopting the water body flow management method, the first interception area first performs primary filtration, the integrated interception device can automatically control whether to introduce the water body in the first interception area through the cooperation of the water inlet pipe and the open and close automatic control member, and the second interception area and the third interception area in the integrated interception device can respectively realize secondary filtration and tertiary filtration, so that the rice tail water with high water nitrogen and phosphorus concentration can be continuously treated.

[0057] (2) The treatment process of the present application first performs in-situ purification for 24-36 hours, fully utilizes the ability of the rice field to utilize and degrade nitrogen and phosphorus, and then discharges the rice tail water into the first interception area and the integrated interception device to realize tertiary filtration. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 It is a working principle schematic diagram of the embodiment of the present application;

[0059] Figure 2 It is a top view of the first interception area and the integrated interception device of the present application;

[0060] Figure 3 It is an exploded view of the upper and lower positions of the floating filter unit two of the present application;

[0061] Figure 4 Schematic diagram of the upper compacted layer of the floating filter unit two provided with a compacting plate;

[0062] Figure 5 Schematic diagram of the self-cleaning structure;

[0063] Figure 6 Flowchart of the backwashing and discharging device;

[0064] Figure 7 Schematic diagram of the specific position of the ecological ditch.

[0065] The reference signs are as follows: 1, a primary interception zone; 2, an integrated interception device; 21, a tail water outlet; 22, a tail water outlet pipe; 3, a secondary interception zone; 31, a floating filter unit one; 32, a material port; 4, a tertiary interception zone; 41, a floating filter unit two; 411, an upper compacted layer; 412, a lower floating layer; 5, a mud baffle; 51, an interception net part; 6, a self-cleaning structure; 61, an electric sliding table; 62, a sliding block; 63, a cleaning plate; 7, a water inlet pipe; 8, a transfer pipe; 9, a drainage pipe; 10, a backwashing and discharging device; 101, a backwashing filter; 102, a particulate matter discharging pipe; 103, a backwashing pump; 104, a control valve; 11, an ecological ditch; 12, a mud baffle. DETAILED DESCRIPTION

[0066] The application will be further described in conjunction with the embodiments and the drawings, but the embodiments of the application are not limited to this.

[0067] In order to provide nutrients required for the growth of rice, promote the growth and development of plants, it is necessary to fertilize the paddy field according to different growth stages of rice. If it rains after fertilization, the concentration of nitrogen and phosphorus in the water in the paddy field will rapidly increase, causing eutrophication of the water in the paddy field. A part of the nitrogen and phosphorus in the water can be absorbed and utilized by the paddy field, and the excess part needs to be discharged as tail water of the paddy field. In view of this situation, the application provides a paddy field tail water discharge treatment system, which combines plant belts and wetland filtration, water flow management, and control of the treatment process of the discharge treatment system, to solve the problem of direct discharge of tail water of the paddy field.

[0068] As Figure 1 and Figure 2 The discharge treatment system includes an integrated interception device 2 and a primary interception zone 1. Under the action of the integrated interception device 2 and the primary interception zone 1, the discharged water body successively passes through the primary interception zone 1 and the integrated interception device 2, realizes three-stage interception, and thus filters the nitrogen and phosphorus in the water three times.

[0069] The integrated interception device 2 is detachably installed at the end of the rice field, and is a pool body made of prefabricated concrete, which can be integrally transported and placed at the end of the rice field.

[0070] It should be noted that at the end of the rice field, there is usually a facility called "drainage port" or "drainage ditch" for draining excess water in the field to prevent rice roots from being flooded. The position of the integrated interception device 2 can refer to the position of the existing "drainage port" or "drainage ditch". The integrated interception device 2 has a certain depth in order to realize the functions of receiving water and temporarily storing water. Therefore, a pit with a size suitable for the integrated interception device 2 is dug near the rice field to satisfy the difference between the integrated interception device 2 and the rice field.

[0071] Secondly, the first interception area 1 is arranged between the integrated interception device 2 and the end of the rice field, and the first interception area 1 is formed on the dike by utilizing the space between the integrated interception device 2 and the end of the rice field.

[0072] As can be seen from Figure 1 , the first interception area 1 is arranged on the right side of the integrated interception device 2.

[0073] The integrated interception device 2 is provided with independently arranged second interception areas 3 and third interception areas 4. As can be seen from the figure, the second interception areas 3 are arranged on the right side of the integrated interception device 2, and the third interception areas 4 are arranged on the left side of the integrated interception device 2. Each of the second interception areas 3 and the third interception areas 4 is provided with three, and the specific number is not limited. It should be noted that the second interception areas 3 and the third interception areas 4 are arranged one by one.

[0074] Specifically, the first interception area 1 is a groove structure independent of the rice field, which is arranged in the soil near the end of the rice field. The groove structure is actually a square pit with an area of about 1 m2. The bottom of the groove structure is about 20 cm lower than the bottom of the rice field, which is convenient for carrying tail water from the rice field. As Figure 2 , at least two groups of flexible mesh bags are arranged in the groove structure, and the flexible mesh bags contain gravel. When the first interception area 1 is made, the flexible mesh bags containing gravel are laid in the groove structure, and then plants that can absorb nitrogen and phosphorus, such as rice, are planted on the gravel. The rice roots and the gravel can intercept the particles such as soil rich in nitrogen and phosphorus in the water body, and the rice can absorb and convert them. The plants can also be irises, which are not limited.

[0075] Based on the growth conditions of rice, the soil in the rice field needs to be ploughed before planting rice. After ploughing, the rice field is irrigated, and the ploughed land is leveled by a ploughing machine. During ploughing, the soil is turned over and broken, causing the soil particles to mix with water to form mud. During the operation of the ploughing machine, the splashed mud water is easy to spread beyond the dike of the rice field, causing the mud water to easily flow into the first interception area 1. To this end, a mud blocking dike 12 is formed on the periphery of the first interception area 1, which directly utilizes the coagulation ability of the soil to facilitate the fixation of the mud blocking dike 12 on the periphery of the first interception area 1. Figure 1 And Figure 2 A mud blocking dike 12 is formed on the periphery of the first interception area 1, which directly utilizes the coagulation ability of the soil to facilitate the fixation of the mud blocking dike 12 on the periphery of the first interception area 1.

[0076] It should be noted that the mud blocking dike 12 is about 20 cm higher than the rice field, which can effectively block the mud water and prevent it from directly overflowing into the first interception area 1.

[0077] As Figure 1 To facilitate the flow of tail water in the rice field into the first interception area 1, a tail water outlet 21 is provided in the mud blocking dike 12, which connects the rice field and the first interception area 1. A tail water outlet pipe 22 is fixed in the tail water outlet 21, which is used to guide the excess tail water in the rice field into the first interception area 1. The other side of the groove structure away from the tail water outlet 21 is provided with a water inlet pipe 7. The tail water outlet 21 can be temporarily set up, as the soil between the rice field and the groove structure is soil, and the mud blocking dike 12 is also soil, which is easy to punch to form the tail water outlet 21, and then install the tail water outlet pipe 22.

[0078] The bottom of the tail water outlet pipe 22 and the bottom of the rice field are on the same plane, preventing the tail water from overflowing too quickly. In this way, the tail water entering the first interception area 1 through the tail water outlet pipe 22 has a slow speed, and the tail water water rice root system and gravel intercept the particles such as soil rich in nitrogen and phosphorus in the water body, and are absorbed and transformed by the rice.

[0079] As a hydrophyte, the mud blocking dike 12 can block the mud water during ploughing, but the first interception area 1 is the first area to receive the tail water in the rice field, and the tail water has not been filtered at this time. The tail water discharged into the first interception area 1 still contains mud and impurities such as straw and roots.

[0080] The tail water in the tail water outlet pipe 22 has a certain flow rate, and the mud and impurities such as straw and roots will flow with the water body, which may flow from the gravel to the water inlet pipe 7. The mud and impurities such as straw and roots will be washed onto the inner wall of the water inlet pipe 7, and when they accumulate, they will have a certain volume, causing the water inlet pipe 7 to be blocked. As Figure 2In order to block the mud and impurities such as straw and root system, the water inlet pipe 7 is a double-end perforated pipe, i.e. a pipe body structure with a large number of small holes on the surface and closed ends. At this time, the water inlet pipe 7 can block a part of the mud, straw and root system impurities.

[0081] In addition, a mud guard 5 can be detachably installed on the outer wall of the integrated interception device 2 to block the mud and other impurities from entering the water inlet pipe 7 and collect most of the mud and impurities such as straw and root system.

[0082] In combination with Figure 1 and Figure 5 , the mud guard 5 is inclined as a whole, the length of the mud guard 5 is relatively long, and the mud guard 5 and the integrated interception device 2 form an avoiding space, and the inlet end of the water inlet pipe 7 is located in the avoiding space. Due to the avoiding space, the particulate matter, mud and impurities such as straw and root system first contact the mud guard 5.

[0083] The mud guard 5 can be made of a ground glass material with a certain friction on the surface, and a lower interception net part 51 can be made of stainless steel. The mesh of the interception net part 51 is not limited, and can be determined according to the actual situation of the particulate matter, mud, straw and root system. When the particulate matter, mud and impurities such as straw and root system contact the mud guard 5 with tail water, the mud and impurities such as straw and root system can be retained on the surface of the mud guard 5 due to the inclined setting and ground surface of the mud guard 5. Even if part of the mud and impurities slide down along the mud guard 5, the interception net part 51 can also play a blocking role. The initial interception net part 51 may not be able to block all the particulate matter, mud and impurities, but the interception net part 51 has a separation effect, which can separate the mud, block the particulate matter, straw and root system, and the dispersed mud will not block the water inlet pipe 7 even if it enters the water inlet pipe 7.

[0084] After the mud guard 5 is used for a period of time, the mud and impurities will accumulate on the surface of the mud guard 5 and the interception net part 51. The accumulation on the surface of the mud guard 5 will not be mixed into the water body, and the accumulation on the interception net part 51 will be easily impacted by the water with a flow rate from the tail water outlet 21 and then fall into the water inlet pipe 7. Therefore, the self-cleaning structure 6 is arranged above the interception net part 51 of the mud guard 5, and the self-cleaning structure 6 can reciprocate in the horizontal direction relative to the interception net part 51. The staff can clean the accumulation on the interception net part 51 by controlling the self-cleaning structure 6, and the cleaned accumulation can be collected.

[0085] As Figure 5The self-cleaning structure 6 comprises an electric sliding platform 61, a sliding block 62 and a cleaning plate 63. The electric sliding platform 61 is horizontally arranged and fixed to the upper surface of the mudguard 5, i.e. the surface where the mud and impurities are collected. The electric sliding platform 61 is located away from the mud and impurities, i.e. slightly away from the interception net part 51. The sliding block 62 is slidingly connected to the electric sliding platform 61. The cleaning plate 63 is L-shaped and fixed to one end of the sliding block 62. When the sliding block 62 slides relative to the electric sliding platform 61, the cleaning plate 63 reciprocates horizontally relative to the mudguard 5. In order to clean the collected substances on the interception net part 51, the cleaning plate 63 is arranged in a gap with the interception net part 51 and closely approaches the interception net part 51. During the movement of the cleaning plate 63, the collected substances on the surface of the interception net part 51 can be pushed from one end of the interception net part 51. The collected substances are dropped on the bottom of the primary interception area 1 in real time or gradually gathered at the other end of the interception net part 51 and then dropped on the bottom of the primary interception area 1.

[0086] In this way, the cleaning plate 63 can push the collected substances on the surface of the interception net part 51 and the surface of the mudguard 5 at the same time, and the collected substances at the two places are dropped on one end of the primary interception area 1. Since the primary interception area 1 is located in the soil near the paddy field, a separate collection cavity can be arranged at one end of the primary interception area 1. The collection cavity is formed by fixing a partition plate in the primary interception area 1 and is located below the interception net part 51. Even if the collected substances of the mud and impurities are dropped in the collection cavity, the filtration operation of the wastewater will not be affected, and the staff does not need to work hard to handle them.

[0087] As shown in Figure 1 The secondary interception area 3 is provided with a floating filter unit one 31. The upper part of the secondary interception area 3 is communicated with the water inlet pipe 7 on the primary interception area 1. Figure 1 The tertiary interception area 4 is provided with a floating filter unit two 41. The lower part of the tertiary interception area 4 is communicated with the secondary interception area 3 through the transfer pipe 8.

[0088] The upper part of the tertiary interception area 4 is communicated with the outside through the drainage pipe 9. Through the arrangement of the drainage pipe 9, the tail water filtered for three times can be discharged to the outside from the drainage pipe 9.

[0089] The floating filter unit one 31 and the floating filter unit two 41 are consistent in structure. The floating filter unit two 41 is taken as an example for illustration. As shown in Figure 3 The floating filter unit two 41 comprises an upper compacting layer 411 and a lower floating layer 412. The lower floating layer 412 is a filter screen filled with floating filler inside. The lower floating layer 412 is located below the drainage pipe 9 or the water inlet pipe 7 and has a deformation capacity to fill each part in the secondary interception area 3 and the tertiary interception area 4.

[0090] The number of the lower floating layer 412 is at least two, and the weight of each lower floating layer 412 is less than 20 kg, so as to be easily lifted by the staff for cleaning or installation and replacement. The floating filler is an adsorbing resin composite filler with a particle size of 20-30 mm and a density of less than 0.8 kg / L, so as to realize floating. The entire lower floating layer 412 realizes interception of nitrogen and phosphorus and impurities loaded with nitrogen and phosphorus as a whole granular bed filter. The filter screen is made of flexible glass steel wire, and the upper part of the filter screen is provided with a material port 32, so as to facilitate loading of the floating filler. The mesh size of the filter screen is slightly smaller than 18 mm, so as to avoid running out of the floating filler. The filling degree of the filter screen is less than or equal to 70%, so as to provide a surplus space for subsequent floating of the floating filler.

[0091] It should be noted that the lower floating layer 412 occupies more than 80% of the space of the secondary interception area 3 and the tertiary interception area 4. In this way, the upper compaction layer 411 is above the drain pipe 9 or the water inlet pipe 7, and occupies a small space. After the upper compaction layer 411 is fixed in place, the generated gravity presses the lower floating layer 412 downward. Due to the flexible deformation of the filter screen of the lower floating layer 412, the internal floating filler can also move. Except for the space occupied by the pipeline, the lower floating layer 412 is in a state of adhesion with the bottom of the secondary interception area 3 and the tertiary interception area 4, so as to minimize the generation of empty gaps and avoid the accumulation of mud and other impurities in the empty gaps.

[0092] Secondly, the upper compaction layer 411 is provided with a filter frame filled with zeolite. It should be noted that the filter frame is made of hard material, and the upper part of the filter frame is also provided with a material port 32, so as to facilitate loading of the zeolite. The filter frame is detachably locked with the inner wall of the secondary interception area 3 and the tertiary interception area 4 by setting a lock buckle.

[0093] The upper compaction layer 411 is provided with a filter frame, and the filter frame is matched with the tertiary interception area 4. The outer wall of the filter frame is fixedly connected with a sliding strip. The tertiary interception area 4 is provided with a sliding groove corresponding to the sliding strip. The upper compaction layer 411 can slide up and down relative to the inner wall of the tertiary interception area 4 under the cooperation of the sliding strip and the sliding groove. Under normal circumstances, the lower floating layer 412 is pressed on the bottom of the tertiary interception area 4 by the upper compaction layer 411 due to the weight of the upper compaction layer 411. Under special circumstances, the upper compaction layer 411 can be lifted relative to the tertiary interception area 4 to increase the space, so that the floating filler with a density less than water has buoyancy, and the lower floating layer 412 floats.

[0094] Optimization, such as Figure 4 The upper compaction layer 411 can also be provided with a compaction plate. One side of the compaction plate is hinged with the inner wall of the secondary interception area 3 and the tertiary interception area 4 by setting a hinge shaft, and the other side is detachably locked with the inner wall of the secondary interception area 3 and the tertiary interception area 4 by setting a lock buckle.

[0095] The difference is that when the compacted layer 411 adopts the compacted plate, the upper compacted layer 411 is normally arranged horizontally and in a locked state, and the lower floating layer 412 is blocked by the upper compacted layer 411, thereby being pressed on the bottom of the third interception area 4. In special cases, the upper compacted layer 411 can be flipped relative to the second interception area 3 and the third interception area 4, and no longer blocks the lower floating layer 412. The buoyant filler with a density less than water can have buoyancy, so that the lower floating layer 412 floats.

[0096] The tail water in the first interception area 1 enters the second interception area 3 from the water inlet pipe 7, and is filtered twice by the zeolite and the filler in the upper compacted layer 411 and the floating layer 412 from top to bottom. The tail water in the second interception area 3 enters the third interception area 4 through the transfer pipe 8, and is further filtered three times by the filler and the zeolite in the lower floating layer 412 and the upper compacted layer 411 from bottom to top.

[0097] It should be noted that after the fertilized paddy field is washed by heavy rain, the paddy field can utilize and degrade nitrogen and phosphorus by itself. Before the tail water enters the first interception area 1, the tail water is allowed to deposit in the paddy field for 24-36 hours to achieve in-situ purification.

[0098] After the in-situ purification is completed, in order to facilitate the automatic control of the tail water entering the first interception area 1 and the tail water being discharged from the third interception area 4, the tail water outlet pipe 22, the water inlet pipe 7 and the drain pipe 9 are each provided with an opening and closing automatic control member. The opening and closing automatic control member can be an electromagnetic valve or other valve that can achieve fluid control, so as to facilitate remote control by the staff.

[0099] Although the mud guard 5, the interception net part 51 and the self-cleaning structure 6 can intercept most of the mud and impurities in the first interception area 1, some mud and impurities will enter the second interception area 3. After the muddy water mixed with the water body is filtered by the buoyant filtering unit one 31 and the buoyant filtering unit two 41, some particles, mud and impurities will also settle at the bottom of the second interception area 3 and the third interception area 4, because the flow direction of the water body is as shown by the arrow in Figure 1 Therefore, the integrated interception device 2 is provided with a backwashing and discharging device 10 on the side close to the third interception area 4, which washes the second interception area 3 and the third interception area 4 based on the reverse flow of water to remove the accumulated particles, impurities and the like.

[0100] As shown in FIGS. 1 and 2, Figure 6The backwashing and discharging device 10 is located at the lower part, and is used for backwashing and discharging the secondary interception area 3 and the tertiary interception area 4. The backwashing and discharging device 10 comprises a backwashing filter 101, a particle discharging pipe 102, a backwashing pump 103 and a control valve 104. The backwashing filter 101 is connected to the bottom of the integrated interception device 2, and the other end of the backwashing filter 101 is connected to the backwashing pump 103. The control valve 104 is arranged between the backwashing filter 101 and the backwashing pump 103. The particle discharging pipe 102 is connected to the backwashing filter 101, and the control valve 104 is arranged on the particle discharging pipe 102.

[0101] When the backwashing and discharging device 10 is used, the upper compacted layer 411 in the secondary interception area 3 and the tertiary interception area 4 is lifted or turned over. The backwashing pump 103 is connected to the external water source, and water is added to the tertiary interception area 4 through the backwashing filter 101. The water in the tertiary interception area 4 flows into the secondary interception area 3 through the transfer pipe 8, and drives the floating filter unit one 31 and the floating filter unit two 41 to float and wash the floating filter unit one 31 and the floating filter unit two 41. The floating filter unit two 41 is not located at the bottom of the secondary interception area 3 and the tertiary interception area 4, so that the floating filler and the particles can be rolled until the particles are discharged from the tertiary interception area 4 by the backwashing and discharging device. At the same time, the particles at the bottom of the secondary interception area 3 can also be discharged because the tertiary interception area 4 is connected to the secondary interception area 3.

[0102] As Figure 7 It should be noted that, in order to reduce the dependence of the backwashing pump 103 on the external water source, the integrated interception device 2 is located on the same side of the backwashing and discharging device 10, and the ecological ditch 11 is formed on the same side. The interception dam is arranged in the ecological ditch 11, and the interception dam can refer to the prior art.

[0103] The ecological ditch 11 is used for collecting the water discharged from the backwashing and discharging device 10 and the drainage pipe 9. Because the water contains nitrogen and phosphorus, the ecological ditch 11 can reduce the influence on other organisms near the rice field.

[0104] The ecological ditch 11 is also used for supplying water to the rice field and the backwashing and discharging device 10. The water discharged from the drainage pipe 9 and the particle discharging pipe 102 and the rainwater are collected and used by the backwashing pump 103.

[0105] When the rice field needs to be irrigated, the water containing nitrogen and phosphorus in the ecological ditch 11 is pumped into the rice field by the water pumping device, so as to provide nutrients for the rice field.

[0106] According to the above, the application further provides a rice field end water discharge treatment process, which is specifically as follows.

[0107] First, let the tail water in-situ purification in rice field for 24-36 hours, while, at the end of the rice field installation of the above-mentioned end of the rice field water discharge treatment system, the fender 12 plays a blocking role;

[0108] After that, the opening and closing automatic control member controls the tail water guide pipe 22 to open, and the tail water enters the first interception area 1 from the tail water guide pipe 22, and the tail water is deposited in the first interception area 1 for 24-36 hours, which can also achieve similar to in-situ purification of one-time filtration, while the rice planted in the first interception area 1 intercepts the particles such as soil rich in nitrogen and phosphorus in the water body through the rice root system and gravel, and converts through the rice absorption;

[0109] After that, the opening and closing automatic control member controls the water inlet pipe 7 to open, and the tail water is intercepted by the fender 5 after the fender 5 intercepts part of the mud and impurities, and then enters the second interception area 3 of the integrated interception device 2 from the first interception area 1, and is further intercepted by the floating filter unit one 31 to achieve secondary filtration;

[0110] After that, the tail water enters the third interception area 4 from the middle transfer pipe 8 at the lower part of the second interception area 3, and is further intercepted by the floating filter unit two 41 to achieve tertiary filtration;

[0111] After the discharge treatment system runs for 1-2 years, the self-cleaning structure 6 and the backwashing and discharge device 10 are controlled to work, the self-cleaning structure 6 reciprocates relative to the fender 5, the mud and impurities on the fender 5 are gathered to one end by the cleaning plate 63 and fall to the bottom of the first interception area 1, the backwashing and discharge device 10 adds water to the second interception area 3 and the third interception area 4, drives the floating filter unit one 31 and the floating filter unit two 41 to float and wash the floating filter unit one 31 and the floating filter unit two 41, and drives the floating filler to tumble until the particles and impurities are discharged from the second interception area 3 and the third interception area 4 by the backwashing and discharge device.

[0112] In summary, in the present application, unlike the existing method which can only filter the nitrogen and phosphorus in the tail water to the qualified standard before discharging, the present application is to set the first interception area 1, the integrated interception device 2, the backwashing and discharge device 10 and the ecological ditch 11, so that the tail water flowing out from the end of the rice field is first intercepted by the first interception area 1 to intercept part of the nitrogen and phosphorus, and then the tail water is intercepted by the integrated interception device 2 to intercept part of the nitrogen and phosphorus, and finally the tail water with most of the nitrogen and phosphorus removed is discharged from the drain pipe 9 to the ecological ditch 11. The water discharged to the ecological ditch 11 is not required to reach a certain qualified standard as in the prior art, nor is it directly discharged to the outside.

[0113] In the whole process of the operation of the discharge treatment system, it is not only for treating tail water of rice field, removing nitrogen and phosphorus in the tail water to achieve the purpose of safe discharge, but actually, the present application is for recycling nitrogen and phosphorus in the tail water of rice field, so that the first interception area 1 and the integrated interception device 2 which can intercept nitrogen and phosphorus are arranged, based on the principle of interception, nitrogen and phosphorus which cannot be absorbed and utilized by the rice field are intercepted in the first interception area 1 and the integrated interception device 2 through the medium of tail water, after the rice in the rice field absorbs and utilizes the original nitrogen and phosphorus for a period of time, part of nitrogen and phosphorus attached to the filler in the second interception area 3 and the third interception area 4 is recovered through the backwashing and discharge device 10, the part of recovered water and tail water with low concentration of nitrogen and phosphorus in the ecological ditch 11 can be re-injected into the rice field to provide nitrogen and phosphorus for the rice.

[0114] Since the first interception area 1 is arranged in the soil near the rice field, the first interception area 1 can gradually transfer the part of nitrogen and phosphorus to the rice field for the rice to absorb and utilize.

[0115] Since the second interception area 3 and the third interception area 4 are both provided with the lower floating layer 412 which can float up, the upper part of the second interception area 3 is provided with the upper compaction layer 411 which can move up or overturn, after the lower floating layer 412 and the upper compaction layer 411 are used in combination, not only the interception of nitrogen and phosphorus, particulate matter and other impurities is realized, but also the separation of the intercepted nitrogen and phosphorus, particulate matter and other impurities is realized for repeated use.

[0116] The above is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical solution which belongs to the idea of the present application is within the protection scope of the present application. It should be pointed out that, for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application should be considered as the protection scope of the present application.

Claims

1. A rice field end-of-ditch water disposal treatment system characterized by, The discharge treatment system comprises an integrated interception device (2) detachably installed at the end of a rice field and a first interception zone (1) arranged between the integrated interception device (2) and the end of the rice field, wherein The first interception zone (1) is filled with gravel, the top of the gravel is planted with plants capable of absorbing nitrogen and phosphorus, and a mud berm (12) higher than the rice field is formed on the periphery of the first interception zone (1), and a tail water outlet pipe (22) is arranged between the mud berm (12) and the rice field; The integrated interception device (2) is provided with a second interception zone (3) and a third interception zone (4) arranged independently, and a backwashing and discharge device (10) is arranged on one side of the integrated interception device (2) close to the third interception zone (4), wherein The second interception zone (3) is provided with a floating filter unit one (31), and a water inlet pipe (7) is arranged between the upper part of the second interception zone (3) and the first interception zone (1); The third interception zone (4) is provided with a floating filter unit two (41), a transfer pipe (8) is arranged between the lower part of the third interception zone (4) and the floating filter unit one (31), the lower part of the third interception zone (4) is also arranged in communication with the backwashing and discharge device (10), and a drainage pipe (9) is arranged in communication with the outside at the upper part of the third interception zone (4); The tail water outlet pipe (22), the water inlet pipe (7) and the drainage pipe (9) are all provided with automatic opening and closing control members; The backwashing and discharge device (10) is used for completing backwashing and discharge of the second interception zone (3) and the third interception zone (4) respectively; The first interception zone (1) is a groove structure independent of the rice field, the bottom of the groove structure is lower than the bottom of the rice field, and at least two groups of flexible mesh bags are arranged in the groove structure, and the flexible mesh bags contain the gravel; The mud berm (12) is provided with a tail water outlet (21) for communicating the rice field and the first interception zone (1), and the tail water outlet pipe (22) is fixed in the tail water outlet (21); The bottom of the tail water outlet pipe (22) and the bottom of the rice field are on the same plane; The floating filter unit one (31) and the floating filter unit two (41) are identical in structure; The floating filter unit two (41) comprises an upper compacted layer (411) and a lower floating layer (412); The lower floating layer (412) is a filter screen filled with floating filler, and is arranged below the drainage pipe (9) or the water inlet pipe (7) and has a deformation capacity to fill each part of the second interception zone (3) and the third interception zone (4); The upper compacted layer (411) is arranged above the drainage pipe (9) or the water inlet pipe (7), and the lower compacted layer (412) is in a state of adhesion with the bottom of the second interception zone (3) and the third interception zone (4).

2. The rice field end-of-ditch water disposal treatment system of claim 1, wherein, The number of the lower floating layer (412) is at least two, and the weight of each lower floating layer (412) is less than 20 kg; The floating filler has a particle size of 20-30 mm and a density of less than 0.8 kg / L, and has pores on the surface; The filling degree of the filter screen is less than or equal to 70%.

3. The rice field end-of-ditch water disposal treatment system of claim 2, wherein, The upper compaction layer (411) is provided with a filter frame filled with zeolite, and can slide up and down relative to the inner wall of the secondary interception area (3) and the tertiary interception area (4), and is detachably locked with the inner wall of the secondary interception area (3) and the tertiary interception area (4) on one side.

4. The rice field end-of-ditch water disposal treatment system of claim 2, wherein, The upper compaction layer (411) is provided with a compaction plate, and is hinged with the inner wall of the secondary interception area (3) and the tertiary interception area (4) on one side, and is detachably locked with the inner wall of the secondary interception area (3) and the tertiary interception area (4) on the other side.

5. The rice field end-of-ditch water disposal treatment system of claim 3 or 4, wherein, The backwashing and discharging device (10) comprises a backwashing filter (101), a particulate matter discharging pipe (102), a backwashing pump (103) and a control valve (104); The interface at one end of the backwashing filter (101) is horizontally arranged through the bottom of the integrated interception device (2), the interface at the other end of the backwashing filter (101) is in communication with the backwashing pump (103), and the control valve (104) is arranged between the backwashing filter (101) and the backwashing pump (103). The backwashing filter (101) is further provided with the particulate matter discharging pipe (102) in communication, and the control valve (104) is arranged on the particulate matter discharging pipe (102).

6. The rice field end-of-ditch water disposal treatment system of claim 5, wherein, The integrated interception device (2) is located on the same side of the backwashing and discharging device (10) and is provided with an ecological ditch (11), and the interception dam is arranged in the ecological ditch (11). The ecological ditch (11) is used for collecting water discharged from the backwashing and discharging device (10) and the drain pipe (9), and is also used for supplying water to the paddy field and the backwashing and discharging device (10).

7. A rice field end-of-pipe water discharge treatment process, characterized by, The treatment process is as follows: Firstly, the tail water is purified in situ in the paddy field for 24-36 hours, and the paddy field end water discharge treatment system in claim 6 is installed at the end of the paddy field, and the mud barrier plays a blocking role; Then, the automatic opening and closing control member controls the tail water guide pipe to open, and the tail water gradually enters the primary interception area (1) from the tail water guide pipe, and the tail water is filtered once in the primary interception area (1); Then, the automatic opening and closing control member controls the water inlet pipe (7) to open, and the tail water in the primary interception area (1) enters the secondary interception area (3) of the integrated interception device (2), and the tail water is intercepted by the floating filter unit one (31) to realize secondary filtration; Then, the tail water enters the tertiary interception area (4) from the lower part of the secondary interception area (3), and the water is intercepted by the floating filter unit two (41) to realize tertiary filtration, and the filtered tail water is discharged into the ecological ditch (11); After the discharge treatment system is operated for 1-2 months, the backwashing and discharging device (10) is controlled to work, and the locking position of the upper compaction layer (411) is opened, the backwashing and discharging device (10) adds water to the secondary interception area (3) and the tertiary interception area (4), drives the lower floating layer (412) in the floating filter unit one (31) and the floating filter unit two (41) to float and flush the lower floating layer (412), and drives the floating filler to tumble until the water in the secondary interception area (3) and the tertiary interception area (4) is discharged into the ecological ditch (11) by the backwashing and discharging device (10). When the paddy field needs to be irrigated, the water body loaded with nitrogen and phosphorus in the ecological ditch (11) is pumped into the paddy field through the water pumping device, so as to provide nutrients for the paddy field.

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