Land-based high-density fish culture and sugarcane intelligent irrigation combined system and method

Abstract

The invention belongs to the technical field of cultivation and discloses a land-based high-density fish culture and sugarcane intelligent irrigation combined system and method, and the system comprises a fish pond, a reservoir, a pre-filtration system, an ultrafiltration system, an oxygen supply system and a biological purification system; according to the method, land-based high-density cultivation and sugarcane irrigation are organically combined according to the characteristic that the water demand in the sugarcane growth process is large, the problems that the yield is low and benefits are low due to the fact that traditional sugarcane planting depends on eating on the sky are solved, the problems that fish culture tail water cannot be directly discharged, and the treatment cost is high are solved, and normal production of land-based fish culture is guaranteed. According to the method, firstly, water originally used for irrigating sugarcane is used for land-based high-density fish culture, and then the sugarcane is irrigated, so that the water cost for irrigating the sugarcane can be reduced, and the average benefit of unit land area is improved; meanwhile, the discharged tail water has a certain organic fertilizer effect, so that the investment of sugarcane planting in the aspect of chemical fertilizer can be reduced, the cost can be reduced, the problem of soil hardening can be relieved, and the soil quality can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aquaculture and planting, and particularly relates to a system and method for combining land-based high-density fish farming with intelligent irrigation of sugarcane. Background Art

[0003] Sugarcane is an annual tropical plant with a large water demand. Its growth process can be divided into a germination period (theoretical time: 14 - 20 days), a seedling period (theoretical time: 20 - 30 days), a tillering period (theoretical time: 30 - 40 days), a stretching period (theoretical time: 60 - 80 days), and a technological maturity period (theoretical time: 90 - 120 days); the harvesting period of sugarcane is from early December of the current year to the end of March of the next year, about 100 - 120 days, and the specific time will vary depending on the daily sugarcane processing capacity of each sugar factory and the total sugarcane output in the sugarcane area it belongs to. The amount of water consumed during the growth process of sugarcane is relatively large. According to records, the average amount of water consumed per ton of raw sugarcane produced is 128.8 - 171.9 tons. The water demand during the growth process of sugarcane is generally less at both ends and more in the middle, that is, the water demand in the early stage (germination period, seedling period, and tillering period) and the later stage (technological maturity period) is less, and the water demand in the middle stage (stretching period) is more. According to the experiments in the South China sugarcane area of China, the water consumption in the germination period and the seedling period accounts for 8.4 - 18.1% of the total water consumption in the whole growth cycle, the tillering period accounts for 15.45 - 21.7%, the stretching period accounts for 51.3 - 57.8%, and the technological maturity period accounts for 2.4 - 19.6% (extracted from "Modern Sugarcane Science" edited by Li Yangrui, published in December 2010). Sugarcane is mainly planted in river valley terraces, hills, and slopes, where the soil is relatively dry, the planting conditions are poor, and it has long been in an extensive planting state of "relying on the weather", and the average yield per unit of sugarcane is severely restricted, and the land output rate is low. Therefore, water is one of the important factors restricting the sugarcane yield and the development of the sugarcane industry.

[0004] With the cancellation of cage fish farming in rivers and reservoirs, land-based high-density fish farming has become one of the important means of fishery aquaculture. At present, recycled water is generally used for land-based fish farming in China. Because of its large aquaculture density and large amount of bait feeding, a large amount of residual bait and feces are produced every day. To ensure the water quality, most of them adopt the methods of increasing the recycled water volume and the water replacement volume to remove the residual bait and feces in the fish pond. The daily tail water discharge is 0.8 - 1.2 times the volume of a single fish pond. The tail water is filtered by a microfilter and then subjected to aerobic treatment, and then purified by a biological floating bed or an artificial wetland, and finally discharged up to standard or recycled back to the fish pond for use. Due to the large amount of discharged tail water, the large capacity of the biological purification facilities, the high construction cost, and the high treatment cost, and the direct discharge does not meet the standards and will cause water resource waste, these problems restrict the development of recycled water fish farming.

[0005] In summary, sugarcane requires a large amount of water during its growth process, while land-based intensive fish farming discharges a large amount of tail water rich in organic matter every day. Therefore, combining sugarcane cultivation with land-based intensive fish farming can not only increase sugarcane yield and reduce the input of chemical fertilizers, but also reduce the treatment cost of land-based fish farming tail water, relieve the environmental protection pressure, and further improve the economic benefits per unit area of sugarcane cultivation, which plays a great role in promoting the development of the sugarcane industry and freshwater fishery.

[0006] An ultrafiltration membrane is a microporous membrane with a pore size between 0.01 - 0.1 μm, which can effectively filter out organic matter, bacteria and particles in aquaculture wastewater, so as to achieve the purpose of purifying wastewater. Since ammonia nitrogen molecules are relatively small, the ultrafiltration membrane cannot completely filter them out. Generally, the removal rate of ammonia nitrogen in aquaculture wastewater by the ultrafiltration membrane is above 60%. In addition, the ultrafiltration membrane can also reduce the volatilization of ammonia gas when treating aquaculture wastewater, thus reducing environmental pollution. Although the ammonia nitrogen removal rate of the ultrafiltration membrane is relatively low, it still plays a very important role in the treatment of aquaculture wastewater, especially for the treatment of aquaculture wastewater from some small-scale farms and with relatively mild pollution.

[0007] In the existing aquaculture tail water treatment technologies, most of the combinations with planting are fish-vegetable and fish-rice models. The main disadvantages are that they require a large planting area of matching vegetables and rice, have poor adaptability to weather changes (such as extreme weather like drought and heavy rain), and the growth cycles of vegetables and rice are relatively short, which have certain limitations for aquaculture.

[0008] Through the above analysis, the problems and defects existing in the prior art are as follows:

[0009] Currently, there is no mature technology or case that combines ultrafiltration technology, biological purification technology and sugarcane irrigation to treat aquaculture tail water according to the different water requirements of sugarcane at different growth stages. Summary of the Invention

[0010] In view of the problems existing in the prior art, the present invention provides a system combining land-based intensive fish farming and intelligent irrigation of sugarcane.

[0011] The present invention is implemented as follows. A system combining land-based intensive fish farming and intelligent irrigation of sugarcane includes:

[0012] Fish ponds, water storage ponds, pre-filtration systems, ultrafiltration systems, oxygen supply systems and biological purification systems;

[0013] An oxygenation loop pipe is provided in the fishpond, and the oxygenation loop pipe is connected to an oxygen supply system through a pipeline provided with an air inlet valve; a bottom discharge valve is provided at the bottom of the fishpond and is connected to the inlet of a microfilter of a pre-filtering system through a main drainage pipe; an overflow tank for defining the maximum liquid level is provided outside the fishpond, and an overflow plate is provided in the middle of the overflow tank to isolate the inlet and the outlet into two independent areas, which are respectively connected to the bottom of the fishpond and the main drainage pipe through pipelines; a liquid level sensor, an on-line dissolved oxygen monitor and an on-line ammonia nitrogen content monitor are provided in the fishpond;

[0014] 2 to 3 rows of uniformly distributed air holes are provided along the axial direction at the bottom of the oxygenation loop pipe, the diameter of the air holes is 1 to 3 mm, and the total opening area of all the air holes is smaller than the cross-sectional area of the inner hole of the oxygenation loop pipe;

[0015] There may be one or more fishponds, and the bottom discharge valves of multiple fishponds are all connected to the main drainage pipe;

[0016] A clean water inlet valve is provided in the reservoir, a liquid level sensor is provided in the reservoir, and the bottom of the reservoir is connected to the fishpond through a pipeline provided with a water inlet valve;

[0017] The pre-filtering system includes: a microfilter, a solid-state fermentation tank, a filtrate tank and a filtrate pump; the filtrate outlet of the microfilter is connected to the filtrate tank, and the filter residue outlet of the microfilter is connected to the solid-state fermentation tank; a liquid level sensor is provided in the filtrate tank, and the bottom of the filtrate tank is connected to the inlet of the filtrate pump; the outlet of the filtrate pump is connected to an ultrafiltration system through a filtrate pipe A provided with an ultrafiltration inlet valve, and the outlet of the filtrate pump is also connected to a fertilizer mixing tank of an irrigation system through a filtrate pipe B provided with a fertilizer mixing tank inlet valve. A branch pipeline connected to a sedimentation tank is also provided on the filtrate pipe B, and a sedimentation tank inlet valve is provided on the branch pipeline;

[0018] The aperture of the microfilter screen is 100 to 250 meshes, and preferably 150 to 200 meshes;

[0019] The solid-state fermentation tank adopts existing technologies and equipment;

[0020] The clear liquid side of the ultrafiltration system is connected to a purification water tank of a biological purification system through a pipeline provided with an ultrafiltration clear water valve, and the concentrated liquid side of the ultrafiltration system is connected to the inlet of a sedimentation tank through a pipeline provided with an ultrafiltration concentrated water valve;

[0021] The ultrafiltration system can adopt an inorganic membrane or an organic membrane, and the cut-off aperture is 0.02 to 0.1 μm;

[0022] The oxygen supply system can provide compressed air by an air compressor or provide oxygen by an oxygen generator, and either one can be selected or both can be combined;

[0023] The biological purification system includes a sedimentation tank, a biological filter, a biological floating bed, a purification water tank, a purification water pump, and a pipeline type ultraviolet disinfection device; a liquid level sensor is provided in the sedimentation tank, the upper clear water outlet at the top of the sedimentation tank is connected to the inlet of the biological filter, and the sludge discharge port at the bottom of the sedimentation tank is connected to a fertilizer mixing tank through a pipeline provided with a sludge discharge valve; the purified water outlet of the biological filter is connected to the inlet of the biological floating bed; the purified water outlet of the biological floating bed is connected to the purification water tank; a liquid level sensor is provided in the purification water tank, and the bottom of the purification water tank is connected to the inlet of the purification water pump; the outlet of the purification water pump is connected to a water storage tank through a pipeline; the pipeline type ultraviolet disinfection device is arranged on the pipeline connecting the purification water pump and the water storage tank.

[0024] Furthermore, in addition to including a fish pond, a water storage tank, a pre-filtration system, an ultrafiltration system, an oxygen supply system, and a biological purification system, it also includes an irrigation system and an automatic control system;

[0025] The irrigation system includes a liquid fertilizer storage tank, a fertilizer mixing tank, an irrigation water pump, an irrigation water main pipe, a sprinkler irrigation device, and a sugarcane field; a stirring device and a liquid level sensor are provided in the liquid fertilizer storage tank, and the bottom of the liquid fertilizer storage tank is connected to the fertilizer mixing tank through a pipeline provided with a bottom discharge valve; a stirring device and a liquid level sensor are provided in the fertilizer mixing tank, and the bottom of the fertilizer mixing tank is connected to the inlet of the irrigation water pump; the outlet of the irrigation water pump is connected to the irrigation water main pipe; the irrigation water main pipe is arranged beside the sugarcane field;

[0026] The sprinkler irrigation device includes an irrigation water branch pipe, a soil moisture monitor, and a sprinkler head;

[0027] The sprinkler head is arranged in the sugarcane field, the sprinkler head is connected to the irrigation water main pipe through the irrigation water branch pipe, and an irrigation water distribution valve is provided on the irrigation water branch pipe; the soil moisture monitor is arranged under the soil within the spraying range of the sprinkler head;

[0028] The automatic control system can automatically adjust the water quality according to the dissolved oxygen content and ammonia nitrogen content in the water body of the fish pond, can perform automatic irrigation according to the water demand requirements of sugarcane in different growth periods in the sugarcane field and the soil moisture content, and can realize the switching between automatic control and manual control;

[0029] Through the liquid fertilizer storage tank and the fertilizer mixing tank of the irrigation system, the water body and the liquid fertilizer are mixed and then transported to the sprinkler irrigation device in the sugarcane field through the irrigation water pump;

[0030] According to the data fed back by the sugarcane water demand and the soil humidity sensor, the output flow and irrigation time of the irrigation water pump are adjusted through the intelligent control system;

[0031] According to the water requirements of sugarcane in different growth stages, different irrigation lines are adopted to convey the mixed water body to the sugarcane field; during the vigorous growth period of sugarcane, the irrigation frequency and water volume can be increased; during the slow growth period, irrigation can be appropriately reduced; when sugarcane does not require irrigation, the tail water of the fish pond can be purified through an ultrafiltration system and a biological purification system and then returned to the reservoir for recycling in the fish pond.

[0032] Further, the automatic control system controls the opening degree of the air inlet valve of the fish pond according to the dissolved oxygen content monitored by the on-line dissolved oxygen monitor, so as to keep the dissolved oxygen content in the water body of the fish pond between 5 and 8 mg / L.

[0033] Further, the automatic control system controls the opening degree of the water inlet valve of the fish pond according to the ammonia nitrogen content monitored by the on-line ammonia nitrogen content monitor, so as to keep the ammonia nitrogen content in the water body of the fish pond less than 0.5 mg / L.

[0034] Further, the in-line ultraviolet disinfection device is arranged on the pipeline connecting the purification water pump and the reservoir; the start and stop signals of the purification water pump are linked to the start and stop of the in-line ultraviolet disinfection device.

[0035] Further, the clear liquid side of the ultrafiltration system is connected to the purification water tank; the concentrated liquid side of the ultrafiltration system is successively connected to the sedimentation tank, the biological filter tank and the biological floating bed; the sludge discharge port at the bottom of the sedimentation tank is connected to the fertilizer mixing tank; the purified water outlet of the biological floating bed is connected to the purification water tank.

[0036] The soil moisture monitor is installed in the soil within the spraying range of the sprinkler head, mainly monitoring the moisture content of four soil layers at 20 cm, 30 cm, 40 cm and 50 cm; it can be a single-layer soil moisture monitor or a multi-layer soil moisture monitor, preferably a multi-layer soil moisture monitor.

[0037] Further, the soil moisture monitor and the irrigation water distribution valve are matched in a 1:1 ratio.

[0038] Further, the tail water generated by the fish pond is first roughly filtered by a microfilter, and the obtained filtrate has the following four treatment methods;

[0039] The first treatment method: the filtrate enters the fertilizer mixing tank directly through the filtrate pipe B and is directly used for irrigating sugarcane in the sugarcane field;

[0040] The second treatment method: the filtrate enters the fertilizer mixing tank directly through the filtrate pipe B, most of it is directly used for irrigating sugarcane in the sugarcane field, and a small part enters the sedimentation tank through a branch pipeline, and then enters the biological filter tank and the biological floating bed for purification in sequence from the upper clear water outlet at the top of the sedimentation tank, and the obtained purified water enters the purification water tank and is pumped to the reservoir for recycling;

[0041] The third treatment method: The filtrate enters the ultrafiltration system through the filtrate pipe A for filtration. The ultrafiltration clear water obtained enters the purification pool; the ultrafiltration concentrated water obtained enters the sedimentation tank for sedimentation. Most of the ultrafiltration concentrated water enters the biological filter and biological floating bed in sequence from the upper clear water outlet at the top of the sedimentation tank for purification. The purified water obtained enters the purification pool and is mixed with the ultrafiltration clear water obtained from the ultrafiltration system, and then is pumped to the reservoir for recycling; a small part of the ultrafiltration concentrated water is discharged from the sludge discharge port at the bottom of the sedimentation tank and enters the fertilizer mixing tank for irrigating sugarcane in the sugarcane field.

[0042] The fourth treatment method: The filtrate enters the ultrafiltration system through the filtrate pipe A for filtration. The ultrafiltration clear water obtained enters the purification pool; the ultrafiltration concentrated water obtained enters the sedimentation tank for sedimentation, and then enters the biological filter and biological floating bed in sequence from the upper clear water outlet at the top of the sedimentation tank for purification. The purified water obtained enters the purification pool and is mixed with the ultrafiltration clear water obtained from the ultrafiltration system, and then is pumped to the reservoir for recycling; the filtrate does not go to the sugarcane field for irrigating sugarcane.

[0043] During the germination and seedling growth stages of sugarcane, the tail water generated by the fish pond is first roughly filtered by a microfilter. The obtained filtrate adopts the third treatment method; the automatic control system measures the soil water content of the 30-cm soil layer according to the soil moisture monitor, so that 50-60% of the filtrate is purified and then returned to the reservoir for recycling, and 40-50% of the filtrate goes to the sugarcane field for irrigating sugarcane, and the ratio of the soil water content to the field water holding capacity is controlled between 65% and 75%.

[0044] During the tillering growth stage of sugarcane, the tail water generated by the fish pond is first roughly filtered by a microfilter. The obtained filtrate adopts the second treatment method; the automatic control system measures the soil water content of the 40-cm soil layer according to the soil moisture monitor, so that 15-25% of the filtrate is purified and then returned to the reservoir for recycling, and 75-85% of the filtrate goes to the sugarcane field for irrigating sugarcane, and the ratio of the soil water content to the field water holding capacity is controlled between 70% and 80%.

[0045] During the elongation growth stage of sugarcane, the tail water generated by the fish pond is first roughly filtered by a microfilter. The obtained filtrate adopts the first treatment method; the automatic control system measures the soil water content of the 50-cm soil layer according to the soil moisture monitor, so that 95-100% of the filtrate goes to the sugarcane field for irrigating sugarcane, and the ratio of the soil water content to the field water holding capacity is controlled between 80% and 90%.

[0046] During the period of the technological maturity and growth stage of sugarcane, the tail water generated by the fish pond is first roughly filtered by a microfilter, and the obtained filtrate is treated in the third way; the automatic control system detects the soil water content of the 50-cm soil layer according to the soil moisture monitor, so that 75-85% of the filtrate is purified and then returned to the reservoir for recycling, and 15-25% of the filtrate is used to irrigate sugarcane in the sugarcane field, and the ratio of the soil water content to the field water holding capacity is controlled between 60% and 75%;

[0047] During the sugarcane harvesting period, the tail water generated by the fish pond is first roughly filtered by a microfilter, and the obtained filtrate is treated in the third way; the automatic control system detects the soil water content of the 50-cm soil layer according to the soil moisture monitor, so that 85-95% of the filtrate is purified and then returned to the reservoir for recycling, and 5-15% of the filtrate is used to irrigate the unharvested sugarcane in the sugarcane field, and the ratio of the soil water content to the field water holding capacity is controlled between 60% and 75%;

[0048] During the period from when all the sugarcane is harvested to the sugarcane germination period, the tail water generated by the fish pond is first roughly filtered by a microfilter, and the obtained filtrate is treated in the fourth way, so that 95-100% of the filtrate is purified and then returned to the reservoir for recycling and not used to irrigate sugarcane in the sugarcane field; when the ratio of the soil water content of the 30-cm soil layer detected by the soil moisture monitor to the field water holding capacity is lower than 50%, the automatic control system will switch to the third treatment method, and the ratio of the soil water content to the field water holding capacity is controlled between 60% and 70%;

[0049] During the period when the sugarcane field needs irrigation, when there is continuous rain or heavy rain, if all the multiple soil moisture monitors detect that the ratio of the soil water content of the 20-cm soil layer to the field water holding capacity reaches 100%, the tail water generated by the fish pond is first roughly filtered by a microfilter, and the obtained filtrate will be switched to the fourth treatment method by the automatic control system, so that 95-100% of the filtrate is purified and then returned to the reservoir for recycling and not used to irrigate sugarcane in the sugarcane field;

[0050] The ratio of the total volume of the fish pond to the irrigation area of the sugarcane field is 5-10:1, preferably 6-8:1;

[0051] The clean water in the reservoir first enters the fish pond for fish farming. The tail water generated by the fish pond is roughly filtered by a microfilter. The obtained filtrate, according to the real-time data monitored by the soil moisture monitor and combined with the water demand requirements of sugarcane in different growth stages such as the germination period, seedling period, elongation period and technological maturity period, during the period when sugarcane needs irrigation, a small part or all of the filtrate is used to irrigate sugarcane through the irrigation system; during the period when sugarcane does not need irrigation, all the filtrate is purified through the ultrafiltration system and the biological purification system and then returned to the reservoir for recycling.

[0052] Combined with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0053] First, in view of the characteristic that sugarcane requires a large amount of water during the growth process, the present invention organically combines land-based high-density fish farming with sugarcane irrigation, which not only solves the problems of low yield and low efficiency in traditional sugarcane planting due to "relying on the weather", but also solves the confusion that the fishpond tail water cannot be directly discharged and the treatment cost is high, ensuring the normal production of land-based fish farming.

[0054] The present invention first uses the water originally for sugarcane irrigation for land-based high-density fish farming and then irrigates sugarcane, which can reduce the water cost of sugarcane irrigation and improve the average benefit per unit land area. At the same time, the discharged tail water has certain organic fertilizer effects, which can not only reduce the input of chemical fertilizers in sugarcane planting, reduce costs, but also alleviate the problem of soil compaction, improve soil quality, and improve soil structure.

[0055] The present invention innovatively combines the ultrafiltration technology, biological purification technology with sugarcane irrigation according to the water demand requirements of different growth stages of sugarcane, and adopts different treatment methods for the tail water of high-density fish farming. On the premise of ensuring effective irrigation of sugarcane, it can not only ensure that the water quality of the purified water can meet the requirements of aquaculture water, improve the quality of fish products, but also reduce the purification cost of fishpond tail water, and at the same time reduce the floor area of the biological purification system and lower the construction cost.

[0056] The land-based high-density fish farming system and sugarcane irrigation system of the present invention are interrelated during the period when the sugarcane field needs irrigation, but relatively independent during the period when the sugarcane field does not need irrigation. It has strong adaptability to the differences in water demand requirements of different growth stages of sugarcane and weather changes (such as extreme weather conditions like drought and heavy rain); it can adjust the ratio of ultrafiltered clean water and biologically purified water at any time to avoid the impact of fluctuations in the water consumption for sugarcane irrigation on the water quality of land-based high-density fish farming.

[0057] The present invention has a high degree of automation and intelligence. From the water quality regulation of the fishpond to the control of the water content in the sugarcane field and the conversion of tail water treatment methods, intelligent control can be achieved, with high working efficiency and low labor costs.

[0058] Second, through innovative technical solutions, the present invention organically combines the high-density fishpond tail water with sugarcane irrigation to solve the problems of efficient water resource utilization and improved agricultural benefits. Taking the sugarcane planting area of 12.5264 million mu in Guangxi in 2023 as an example, assuming that each fishpond can irrigate 10 mu of sugarcane fields, according to the income calculation of the embodiment, the irrigation water cost can be significantly reduced every year, the sugarcane yield can be increased, bringing significant economic benefits to farmers. Just the total income from sugarcane can increase by 18.04 billion yuan. If it is extended to the sugarcane planting area of 18.977 million mu across the country, the potential economic and social value will be even more considerable, reflecting the strong commercial value of the present invention.

[0059] The present invention has for the first time achieved the low-cost and harmless treatment of large-area and concentrated high-density fishpond tail water and effectively applied it to agricultural irrigation, filling the technical gap in this field at home and abroad. In traditional technologies, the treatment methods of high-density fishpond tail water are complex and costly, and cannot be applied on a large scale in agriculture. By combining the tail water with sugarcane planting, the present invention has formed an innovative and efficient water resource recycling mode, providing a new solution for modern agriculture and aquaculture.

[0060] For a long time, sugarcane planting has relied on the traditional mode of "depending on the weather", with the yield being greatly affected by the climate, the efficiency of unit area of land being low, and at the same time, the irrigation cost being high, which restricts the popularization of irrigation. Through the tail water irrigation technology, the present invention not only effectively reduces the water cost for sugarcane irrigation, but also significantly improves the yield and land use efficiency, successfully solving the long-existing technical problems in sugarcane planting and promoting the reform of agricultural planting technology.

[0061] The present invention has broken through the technical bottleneck of large tail water discharge and the need for complex biochemical treatment in the field of land-based high-density fish farming. The traditional view is that the tail water needs to be treated at high cost before it can be discharged externally, and large-scale application cannot be formed. By directly irrigating sugarcane with the tail water, the present invention realizes the resource utilization of the tail water, not only significantly reducing the tail water treatment cost, but also opening up a new and efficient combination path in the fields of agriculture and aquaculture, overcoming the long-existing technical prejudice.

[0062] The technical solution of the present invention realizes the harmless utilization of high-density fishpond tail water, avoids the pollution to the environment caused by direct discharge of the tail water, and at the same time forms an efficient water resource recycling mode through the application of sugarcane irrigation. This eco-friendly innovative technical solution not only improves the economic benefits of agricultural planting, but also provides a demonstration effect for the sustainable development of modern agriculture, with significant environmental value.

[0063] The present invention is applicable to various planting scenarios of crops requiring irrigation, and particularly demonstrates excellent benefits and adaptability in sugarcane planting. Its technical solution is simple and easy to implement, with a low implementation threshold, and can be quickly promoted to the national and even international markets. In regions with a large sugarcane planting area and high water use costs, the present invention can not only significantly increase farmers' income, but also promote the deep integration of agriculture and aquaculture, providing a practical technical solution for regions with limited resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 FIG. is a system structure block diagram of the combination of land-based high-density fish farming and intelligent sugarcane irrigation provided by an embodiment of the present invention.

[0065] Figure 2 FIG. is a system flow chart of the combination of land-based high-density fish farming and intelligent sugarcane irrigation provided by an embodiment of the present invention.

[0066] Figure 3 FIG. is a schematic installation diagram of the fish pond of the system of the combination of land-based high-density fish farming and intelligent sugarcane irrigation provided by an embodiment of the present invention.

[0067] Figure 4 FIG. is a schematic installation diagram of the multi-layer soil moisture monitor of the system of the combination of land-based high-density fish farming and intelligent sugarcane irrigation provided by an embodiment of the present invention.

[0068] In the figure: 1, fish pond; 2, reservoir; 3, microfilter; 4, solid fermentation tank; 5, filtrate tank; 6, filtrate pump; 7, ultrafiltration system; 8, sedimentation tank; 9, biological filter; 10, biological floating bed; 11, purification water tank; 12, purification water pump; 13, pipeline type ultraviolet disinfection device; 14, liquid fertilizer storage tank; 15, fertilizer mixing barrel; 16, irrigation water pump; 17, irrigation water main pipe; 18, sugarcane field; 19, irrigation water branch pipe; 20, soil moisture monitor; 21, sprinkler head; 22, oxygen supply system; 23, automatic control system; 101, fish pond liquid level sensor; 102, fish pond air inlet valve; 103, fish pond water inlet valve; 104, overflow trough; 105, dissolved oxygen on-line monitor; 106, ammonia nitrogen content on-line monitor; 107, oxygenation loop pipe; 108, fish pond bottom discharge valve; 109, drainage main pipe; 201, clean water inlet valve; 202, reservoir liquid level sensor; 501, filtrate tank liquid level sensor; 601, filtrate pipe A; 602, ultrafiltration inlet valve; 603, filtrate pipe B; 604, fertilizer mixing barrel water inlet valve; 605, branch pipeline; 606, sedimentation tank water inlet valve; 701, ultrafiltration clean water valve; 702, ultrafiltration concentrated water valve; 801, sedimentation tank liquid level sensor; 802, sedimentation tank sludge discharge valve; 1101, purification water tank liquid level sensor; 1401, liquid fertilizer storage tank bottom discharge valve; 1402, liquid fertilizer storage tank liquid level sensor; 1501, fertilizer mixing barrel liquid level sensor; 1901, irrigation water distribution valve. Detailed implementation manners

[0069] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0070] The present invention proposes a method combining land-based high-density fish farming and intelligent irrigation of sugarcane, which organically combines aquaculture and agricultural planting. By recycling fishpond tail water and intelligently controlling the irrigation process, not only the resource utilization efficiency is significantly improved, but also environmental pollution is effectively reduced, providing an innovative solution for the sustainable development of agriculture and fishery.

[0071] The core innovation of the present invention is that after the fishpond tail water is subjected to solid-liquid separation and multi-stage purification, it is used as the irrigation water for sugarcane. At the same time, the output flow and irrigation time of the irrigation pump are dynamically adjusted through an intelligent control system. In addition, the filter residue is made into liquid fertilizer through a fermentation tank and mixed with the tail water for precise fertilization, forming an efficient resource recycling utilization model for agriculture and fishery.

[0072] Compared with the prior art, the present invention realizes the intelligent regulation of the irrigation water for sugarcane and the fertilizer-water balance, and at the same time optimizes the treatment process of the fishpond tail water, significantly improving the overall efficiency of the system. During the sugarcane irrigation process, the irrigation frequency and water volume are dynamically adjusted according to the growth stage, effectively avoiding the waste of water and fertilizer, while improving the yield and quality of sugarcane, providing an efficient and intelligent combination model of planting and breeding for modern agriculture.

[0073] This method is applicable to the scenario of combining land-based aquaculture and agricultural planting, especially in areas with limited resources and great environmental pressure. By combining the fishpond tail water with the intelligent irrigation system for sugarcane, not only can the resource utilization rate be improved, but also the negative impact of traditional agriculture on the environment can be reduced, with broad promotion value and market application potential, meeting the direction of green development of modern agriculture.

[0074] As Figure 1 shown, a system combining land-based high-density fish farming and intelligent irrigation of sugarcane provided by an embodiment of the present invention includes:

[0075] A fishpond 1, a reservoir 2, a pre-filtering system, an ultrafiltration system 7, an oxygen supply system 22, a biological purification system, an irrigation system and an automatic control system 23;

[0076] The top of the fish pond 1 is connected to the reservoir 2 through a pipeline provided with a water inlet valve 103. An aeration loop pipe 107 is arranged in the fish pond 1. The aeration loop pipe 107 is connected to the oxygen supply system 22 through a pipeline provided with an air inlet valve 102. A bottom drain valve 108 is arranged at the bottom of the fish pond 1 and is connected to the inlet of the microfilter 3 of the pre-filtering system through a drainage main pipe 109. An overflow tank 104 for limiting the highest liquid level is arranged outside the fish pond 1. An overflow plate is arranged in the middle of the overflow tank 104 to isolate the inlet and outlet into two independent areas, which are connected to the bottom of the fish pond 1 and the drainage main pipe 109 respectively through pipelines. A liquid level sensor 101, a dissolved oxygen on-line monitor 105 and an ammonia nitrogen content on-line monitor 106 are arranged in the fish pond 1.

[0077] Two to three rows of uniformly distributed air holes are arranged along the axial direction at the bottom of the aeration loop pipe 107, the diameter of the air holes is 1-3 mm, and the total opening area of all the air holes is smaller than the cross-sectional area of the inner hole of the aeration loop pipe 107.

[0078] There can be one or more fish ponds 1, and the bottom drain valves 108 of multiple fish ponds 1 are all connected to the drainage main pipe 109.

[0079] The reservoir 2 is provided with a clean water inlet valve 201 and a liquid level sensor 202, and the bottom of the reservoir 2 is connected to the fish pond 1 through a pipeline.

[0080] The pre-filtering system includes: a microfilter 3, a solid-state fermentation tank 4, a filtrate tank 5 and a filtrate pump 6. The filtrate obtained by the microfilter 3 enters the filtrate tank 5, and the filter residue obtained by the microfilter 3 enters the solid-state fermentation tank 4. A liquid level sensor 501 is arranged in the filtrate tank 5, and the bottom of the filtrate tank 5 is connected to the inlet of the filtrate pump 6. The outlet of the filtrate pump 6 is connected to the ultrafiltration system 7 through a filtrate pipe A601 provided with an ultrafiltration inlet valve 602, and the outlet of the filtrate pump 6 is also connected to the fertilizer mixing tank 15 of the irrigation system through a filtrate pipe B603 provided with a fertilizer mixing tank inlet valve 604. A branch pipeline 605 connected to the sedimentation tank 8 is arranged on the filtrate pipe B603 after the fertilizer mixing tank inlet valve 604, and a sedimentation tank inlet valve 606 is arranged on the branch pipeline 605.

[0081] The aperture of the filter screen of the microfilter 3 is 100-250 meshes, and preferably 150-200 meshes.

[0082] The solid-state fermentation tank 4 adopts existing technologies and equipment.

[0083] The clear liquid side of the ultrafiltration system 7 is connected to the purification water tank 11 of the biological purification system through a pipeline provided with an ultrafiltration clean water valve 701, and the concentrated liquid side of the ultrafiltration system 7 is connected to the inlet of the sedimentation tank 8 through a pipeline provided with an ultrafiltration concentrated water valve 702.

[0084] The ultrafiltration system 7 can use inorganic membranes or organic membranes, with a cut-off pore size of 0.02 - 0.1 μm; preferably, UF-8060-PVDF hollow fiber ultrafiltration membranes are used, with a cut-off pore size of 0.05 μm, an effective membrane area of 52 m2, an inlet water pressure < 0.3 MPa, a transmembrane pressure difference < 0.15 MPa, a filtration temperature of 5 - 45 °C, a water production flow rate of 1.8 - 4.5 m3 / h / branch, and an effluent turbidity ≤ 0.2 NTU;

[0085] The oxygen supply system 22 can supply compressed air by an air compressor or supply oxygen by an oxygen generator, and either one can be selected or both can be combined;

[0086] The biological purification system includes a sedimentation tank 8, a biological filter 9, a biological floating bed 10, a purification water tank 11, a purification water pump 12, and a pipeline type ultraviolet disinfection device 13; a liquid level sensor 801 is provided in the sedimentation tank 8, the upper clear water outlet at the top of the sedimentation tank 8 is connected to the inlet of the biological filter 9, the sludge discharge port at the bottom of the sedimentation tank 8 is connected to the fertilizer mixing tank 15 through a pipeline provided with a sludge discharge valve 802; the purified water outlet of the biological filter 9 is connected to the inlet of the biological floating bed 10; the purified water outlet of the biological floating bed 10 is connected to the purification water tank 11; a liquid level sensor 1101 is provided in the purification water tank 11, the bottom of the purification water tank 11 is connected to the inlet of the purification water pump 12; the outlet of the purification water pump 12 is connected to the water storage tank 2 through a pipeline; the pipeline type ultraviolet disinfection device 13 is arranged on the pipeline connecting the purification water pump 12 and the water storage tank 2;

[0087] The sedimentation tank 8, the biological filter 9, and the biological floating bed 10 all adopt existing technologies and equipment;

[0088] The irrigation system includes a liquid fertilizer storage tank 14, a fertilizer mixing tank 15, an irrigation water pump 16, an irrigation water main pipe 17, a sprinkler irrigation device, and a sugarcane field 18; a stirring device and a liquid level sensor 1402 are provided in the liquid fertilizer storage tank 14, the bottom of the liquid fertilizer storage tank 14 is connected to the fertilizer mixing tank 15 through a pipeline provided with a bottom discharge valve 1401; a stirring device and a liquid level sensor 1501 are provided in the fertilizer mixing tank 15, the bottom of the fertilizer mixing tank 15 is connected to the inlet of the irrigation water pump 16; the outlet of the irrigation water pump 16 is connected to the irrigation water main pipe 17; the irrigation water main pipe 17 is arranged beside the sugarcane field 18;

[0089] The sprinkler irrigation device includes an irrigation water branch pipe 19, a soil moisture monitor 20, and a sprinkler head 21;

[0090] The sprinkler head 21 is arranged in the sugarcane field 18, the sprinkler head 21 is connected to the irrigation water main pipe 17 through the irrigation water branch pipe 19, and an irrigation water distribution valve 1901 is provided on the irrigation water branch pipe 19; the soil moisture monitor 20 is arranged under the soil within the spraying range of the sprinkler head 21;

[0091] The sprinkler head 21 is a rocker arm type sprinkler head, a turbine type sprinkler head or a micro sprinkler head that can rotate automatically by 360°. The rocker arm type sprinkler head or the turbine type sprinkler head is preferred. The nozzle diameter is 16 mm, the pressure is 2 - 5 kg / cm2, the flow rate is 16 - 25 m3 / h, and the range is 21 - 29 m;

[0092] The sprinkler irrigation device can be one or more, and is evenly distributed in the sugarcane field 18 according to the area of the sugarcane field 18 and the spraying area of the sprinkler head 21;

[0093] The automatic control system 23 can automatically adjust the water quality according to the dissolved oxygen content and ammonia nitrogen content in the water body of the fish pond 1, can automatically irrigate according to the water demand requirements of the sugarcane in different growth periods in the sugarcane field 18 and the soil moisture, and can realize the switching between automatic control and manual control.

[0094] The automatic control system 23 controls the opening degree of the air inlet valve 102 of the fish pond according to the dissolved oxygen content monitored by the dissolved oxygen on-line monitor 105, so as to keep the dissolved oxygen content in the water body of the fish pond 1 between 5 - 8 mg / L;

[0095] The automatic control system 23 controls the opening degree of the water inlet valve 103 of the fish pond according to the ammonia nitrogen content monitored by the ammonia nitrogen content on-line monitor 106, so as to keep the ammonia nitrogen content in the water body of the fish pond less than 0.5 mg / L;

[0096] The start and stop signals of the purification water pump 12 are linked to the start and stop of the pipeline type ultraviolet disinfection device 13.

[0097] The soil moisture monitor 20 is arranged in the soil within the spraying range of the sprinkler head 21, and mainly monitors the moisture content of four soil layers of 20 cm, 30 cm, 40 cm and 50 cm; it can be a single-layer soil moisture monitor or a multi-layer soil moisture monitor, and the multi-layer soil monitor is preferred;

[0098] The soil moisture monitor 20 and the irrigation water distribution valve 1901 are matched in a ratio of 1:1;

[0099] The ratio of the total volume (unit: cubic meters) of the fish pond 1 to the irrigation area (unit: mu) of the sugarcane field 18 is 5 - 10:1, and 6 - 8:1 is preferred.

[0100] Through the coordinated operation of fish pond 1, reservoir 2, pre-filtering system (micro-filter 3, solid fermentation tank 4, filtrate tank 5, filtrate pump 6), ultrafiltration system 7, biological purification system (sedimentation tank 8, biological filter 9, biological floating bed 10, purification water tank 11, purification water pump 12, pipeline type ultraviolet disinfection device 13), irrigation system (liquid fertilizer storage tank 14, fertilizer mixing tank 15, irrigation water pump 16, main irrigation water pipe 17, sprinkler irrigation device 19) and automatic control system 23, the harmless treatment of the tail water from high-density fish farming and its efficient irrigation application in sugarcane planting are realized. As the initial treatment unit of the tail water, fish pond 1 adjusts the water quality in real time through the aeration loop pipe 107, dissolved oxygen on-line monitor 105 and ammonia nitrogen content on-line monitor 106 to ensure that the dissolved oxygen and ammonia nitrogen content in the water body are within a controllable range. After the tail water is discharged from the bottom of fish pond 1, it is introduced into the pre-filtering system through the main drainage pipe 109 for solid-liquid separation.

[0101] The bottom drain valve 108 of fish pond 1 introduces the tail water into the micro-filter 3 through the main drainage pipe 109. The filtrate is transported to the ultrafiltration system 7 through the filtrate tank 5, and the filter residue enters the solid fermentation tank 4. The filter screen aperture of the micro-filter 3 is 150-200 meshes, which can efficiently separate the suspended particles in the water and reduce the burden on the subsequent treatment system. The filtrate pump 6 transports the pre-filtered water to the ultrafiltration system 7 through the filtrate pipe A601. The clear liquid side enters the purification water tank 11, and the concentrated liquid side enters the sedimentation tank 8. After sedimentation and concentration, it enters the fertilizer mixing tank 15 of the irrigation system from the bottom of the sedimentation tank 8. The filtrate pump 6 can also transport the filtered water to the fertilizer mixing tank 15 of the irrigation system through the filtrate pipe B603.

[0102] The clear liquid side of the ultrafiltration system 7 is connected to the purification water tank 11 through the ultrafiltration clear water valve 701, and the concentrated liquid side enters the sedimentation tank 8 through the ultrafiltration concentrated water valve 702. The sedimentation tank 8 is connected to the biological filter 9 through the upper clear water outlet. The further treated water enters the biological floating bed 10, and the purified water body enters the purification water tank 11 through the purified water outlet. Before the water in the purification water tank 11 is transported to the reservoir 2 by the purification water pump 12, it is disinfected by the pipeline type ultraviolet disinfection device 13 to ensure that the water quality meets the irrigation requirements.

[0103] During the sugarcane fertilization period, nitrogen, phosphorus and potassium fertilizers are mixed in the liquid fertilizer storage tank 14 and the fertilizer mixing tank 15 to prepare a liquid fertilizer aqueous solution. The irrigation water pump 16 transports the mixed fertilizer water to the main irrigation water pipe 17, and then to the sprinkler head 21 in the sprinkler irrigation device through the irrigation water branch pipe 19. The sprinkler head 21 adopts a rocker type or turbine type structure, which can realize 360° rotary spraying and is evenly arranged according to the area of the sugarcane field 18 and the spraying coverage range to ensure uniform irrigation of the sugarcane field 18.

[0104] The automatic control system 23 is connected to the dissolved oxygen on-line monitor 105 and ammonia nitrogen content on-line monitor 106 of the fish pond 1, and adjusts the opening degrees of the air inlet valve 102 and the water inlet valve 103 of the aeration loop pipe 107 in the fish pond 1 in real time to keep the dissolved oxygen content in the water body between 5 and 8 mg / L and the ammonia nitrogen content lower than 0.5 mg / L. At the same time, the soil moisture monitor 20 monitors the moisture content of the four layers of 20 cm, 30 cm, 40 cm and 50 cm in the soil of the sugarcane field 18, and automatically controls the irrigation frequency and water volume to meet the water demand requirements of different growth periods of sugarcane.

[0105] The system realizes the precise coordination of the water quality management of the fish pond 1 and the irrigation process through automatic control and real-time monitoring. The start of the purification water pump 12 is linked with the pipeline type ultraviolet disinfection device 13 to ensure that the effluent water quality meets the standards. The filter residue in the solid-state fermentation tank 4 generates organic fertilizer through fermentation and is then reused for agricultural planting. The whole system realizes the resource utilization of the tail water of high-density fish farming, forms an efficient cycle with sugarcane planting, and provides a sustainable solution for agricultural water conservation and yield increase.

[0106] Through the liquid fertilizer storage tank and the fertilizer mixing barrel of the irrigation system, the water body and the liquid fertilizer are mixed and then transported to the sprinkler irrigation device of the sugarcane field through the irrigation water pump;

[0107] According to the water demand of sugarcane and the data fed back by the soil moisture sensor, the output flow and irrigation time of the irrigation water pump are adjusted through the intelligent control system;

[0108] According to the water demand of sugarcane in different growth periods, different irrigation lines are adopted to transport the mixed water body to the sugarcane field; during the vigorous growth period of sugarcane, the irrigation frequency and water volume can be increased; during the slow growth period, the irrigation is appropriately reduced; when sugarcane does not need irrigation, the tail water of the fish pond can be purified through the ultrafiltration system and the biological purification system and then returned to the reservoir for the fish pond to recycle.

[0109] Such as Figure 2 The tail water generated by the fish pond 1 is first roughly filtered by the microfilter 3 of the pretreatment system. The obtained filter residues such as residual baits and fish feces enter the solid-state fermentation tank 4 for fermentation to produce solid organic fertilizer. The obtained filtrate adopts different treatment methods according to the real-time data monitored by the soil moisture monitor 20 and combined with the water demand requirements of sugarcane in different growth stages such as the germination period, seedling period, elongation period and technological maturity period:

[0110] First, during the sugarcane germination and seedling growth stages, the tail water generated by the fishpond 1 is roughly filtered by the microfilter 3. The filtrate obtained enters the ultrafiltration system 7 through the filtrate pipe A601 for filtration. The ultrafiltration clear water obtained enters the purification water tank 11. The ultrafiltration concentrated water obtained enters the sedimentation tank 8 for sedimentation. Part of the ultrafiltration concentrated water enters the biological filter 9 and the biological floating bed 10 in sequence from the upper clear water outlet at the top of the sedimentation tank 8 for purification. The purified water obtained enters the purification water tank 11 and is mixed with the ultrafiltration clear water obtained from the ultrafiltration system 7, and then pumped to the storage tank 2 for recycling. Part of the ultrafiltration concentrated water is discharged from the sludge discharge port at the bottom of the sedimentation tank 8 and enters the fertilizer mixing tank 15 to irrigate the sugarcane fields 18. The automatic control system 23 controls the proportion of the soil water content to the field water holding capacity within 65% - 75% by making 50 - 60% of the filtrate return to the storage tank 2 for recycling after purification and 40 - 50% of the filtrate go to the sugarcane fields 18 to irrigate the sugarcane according to the soil water content parameter detected by the soil moisture monitor 20 for the 30 cm soil layer;

[0111] Second, during the sugarcane tillering growth stage, the tail water generated by the fishpond 1 is first roughly filtered by the microfilter 3. The filtrate obtained passes through the filtrate pipe B603. Part of it enters the fertilizer mixing tank 15 directly to irrigate the sugarcane fields 18, and part enters the sedimentation tank 8 through the branch pipeline 605. It enters the biological filter 9 and the biological floating bed 10 in sequence from the upper clear water outlet at the top of the sedimentation tank 8 for purification. The purified water obtained enters the purification water tank 11 and is pumped to the storage tank 2 for recycling. The automatic control system 23 controls the proportion of the soil water content to the field water holding capacity within 70% - 80% by making 15 - 25% of the filtrate return to the storage tank 2 for recycling after purification and 75 - 85% of the filtrate go to the sugarcane fields 18 to irrigate the sugarcane according to the soil water content parameter detected by the soil moisture monitor 20 for the 40 cm soil layer;

[0112] Third, during the sugarcane elongation growth stage, the tail water generated by the fishpond 1 is first roughly filtered by the microfilter 3. The filtrate obtained passes through the filtrate pipe B603 and all enters the fertilizer mixing tank 15 to directly irrigate the sugarcane fields 18. The automatic control system 23 controls the proportion of the soil water content to the field water holding capacity within 80% - 90% by making 95 - 100% of the filtrate go to the sugarcane fields 18 to irrigate the sugarcane according to the soil water content parameter detected by the soil moisture sensor 20 for the 50 cm soil layer;

[0113] Fourth, during the sugarcane technological maturity growth stage, the tail water generated by the fishpond 1 adopts the same treatment method as that in the sugarcane germination and seedling growth stages. The automatic control system 23 controls the proportion of the soil water content to the field water holding capacity within 60% - 75% by making 75 - 85% of the filtrate return to the storage tank 2 for recycling after purification and 15 - 25% of the filtrate go to the sugarcane fields 18 to irrigate the sugarcane according to the soil water content parameter detected by the soil moisture monitor 20 for the 50 cm soil layer;

[0114] Finally, during the sugarcane harvesting period, the sugarcane that has not been harvested yet is still managed according to the water requirements during the technological maturity stage. Only the proportion of the filtrate used for irrigating sugarcane will gradually decrease. The tail water generated by the fishpond 1 is treated in the same way as during the sugarcane germination and seedling growth stages. The automatic control system 23, based on the soil moisture content parameter detected by the soil moisture monitor 20 in the 50-cm soil layer, allows 80 - 95% of the filtrate to be recycled back to the reservoir 2 after purification, and 5 - 20% of the filtrate is used to irrigate the unharvested sugarcane in the sugarcane field 18, with the ratio of the soil moisture content to the field capacity controlled within 60% - 75%;

[0115] In addition, from the time when all the sugarcane has been completely harvested until the sugarcane germination stage, there is no sugarcane available for irrigation. The tail water generated by the fishpond 1 is first roughly filtered by the microfilter 3, and the resulting filtrate enters the ultrafiltration system 7 through the filtrate pipe A601 for filtration. The ultrafiltration clean water obtained enters the purification water tank 11; the ultrafiltration concentrated water obtained enters the sedimentation tank 8 for sedimentation, and then enters the biological filter 9 and the biological floating bed 10 in sequence from the upper clear water outlet at the top of the sedimentation tank 8 for purification. The purified water obtained enters the purification water tank 11 and is mixed with the ultrafiltration clean water obtained from the ultrafiltration system 7, and then is pumped to the reservoir 2. 95 - 100% of the filtrate is recycled after purification and is not used to irrigate the sugarcane in the sugarcane field 18. When the soil moisture monitor 20 detects that the ratio of the soil moisture content in the 30-cm soil layer to the field capacity is lower than 50%, the automatic control system 23 will open the bottom drain valve 802 of the bottom drain of the sedimentation tank 8 to discharge the concentrated ultrafiltration concentrated water into the fertilizer mixing tank 15 for irrigating the land in the sugarcane field 18, with the ratio of the soil moisture content to the field capacity controlled within 60% - 70%;

[0116] In addition, during the period when sugarcane needs irrigation, when encountering continuous rainy or heavy rain weather, if all the multiple soil moisture monitors 20 detect that the ratio of the soil moisture content in the 20-cm soil layer to the field capacity reaches 100%, the automatic control system 23 will treat the tail water generated by the fishpond 1 in the same way as from the time when all the sugarcane has been completely harvested until the sugarcane germination stage, and 95 - 100% of the filtrate is recycled back to the reservoir 2 after purification and is not used to irrigate the sugarcane in the sugarcane field 18.

[0117] The example was implemented in a second-year ratoon sugarcane field of a large sugarcane grower in Fusui County, Chongzuo City, Guangxi. The sugarcane variety planted was Guitang 42. One mu of land was planned within the 20 mu of sugarcane fields for the construction of land-based high-density fish farming facilities, with 2 land-based fish ponds with a diameter of 8 meters, a height of 1.5 meters, and an effective volume of 70 cubic meters, as well as supporting tail water purification facilities; each fish pond can raise at least 1 - 2 crops of tilapia per year. 3,200 tilapia fry with a length of 6 - 8 cm were released into the 2 fish ponds respectively, and the daily average discharge of aquaculture tail water was 140 tons; the remaining 19 mu of sugarcane fields used the tail water discharged from the fish ponds for intelligent water and fertilizer irrigation. The total amount of chemical fertilizers applied during the growth process of sugarcane was: 20 kg / mu of urea, 10 kg / mu of superphosphate, and 20 kg / mu of potassium chloride.

[0118] The total amount of irrigation water was calculated based on the expected minimum yield of sugarcane of 8 tons / mu and the total water requirement per ton of sugarcane during the growth cycle of 150 tons. The calculation results of the water requirements for each growth stage of sugarcane in the 19 mu of sugarcane fields are shown in Table 1.

[0119] Table 1

[0120]

[0121]

[0122] In Table 1, the time of the harvesting period depends on the daily processing capacity of the sugar factory to which the sugarcane field belongs and the total amount of sugarcane in the sugarcane area of the factory; the water requirement during the harvesting period is not included in the total water requirement during the entire growth period of sugarcane; the irrigation water consumption during the harvesting period will gradually decrease as the sugarcane in the irrigation area is gradually harvested.

[0123] It should be noted that under different regions and different climatic conditions, there will be certain differences in the growth days and water requirements during the growth stages of sugarcane, and the individual size of the cultured fish will also cause changes in the discharge of aquaculture tail water. The proportion of irrigation water can be adjusted according to the actual situation.

[0124] The control example was 20 mu of sugarcane fields next to the sugarcane fields in the example. It was the same sugarcane field of a large sugarcane grower in Fusui County, Chongzuo City, Guangxi. It was also the second-year ratoon Guitang 42 sugarcane. It was managed according to the traditional planting mode of "relying on the weather". The total amount of chemical fertilizers applied during the growth process of sugarcane was: 20 kg / mu of urea, 10 kg / mu of superphosphate, and 20 kg / mu of potassium chloride, which was the same as the application amount in the example.

[0125] Benefit comparison between the example and the control example

[0126] The sugarcane in the example and the sugarcane in the control example were the second-year ratoon Guitang 42 sugarcane in adjacent areas, belonging to the same sugarcane grower, and the same amount of chemical fertilizers was applied during the growth process.

[0127] The total output of the 19 - mu sugarcane field in Example and the total output of the 20 - mu sugarcane field in the control example were respectively counted according to the weighing slips issued by the sugar factory after weighing on the weighbridge. The comparison results of the average mu - yield of sugarcane, the total income from sugarcane, and the average income per unit area of land between the example and the control example are shown in Table 2.

[0128] Table 2

[0129]

[0130]

[0131] In Table 2, the average income per unit area of land of the sugarcane field = total income÷20 mu

[0132] According to Table 2, the total output of sugarcane in the 19 - mu sugarcane field in the example and the total annual income from sugarcane are 53.68% higher than those in the 20 - mu sugarcane field in the control example; the average mu - yield of the sugarcane field in the example is 61.76% higher than that in the control example; the average income per unit area of land of the sugarcane field in the example is 53.68% higher than that in the control example.

[0133] For the cultivation of one crop of tilapia in 2 fish ponds, with the individual weight of the marketable fish being above 0.75 kg per tail, the actual feed consumption, the cost of purchasing fry, the total electricity consumption including the electricity for irrigating sugarcane, and the electricity bill paid at the agricultural electricity price, and the total cost excluding labor are counted as shown in Table 3.

[0134] Table 3

[0135] Total consumption Unit price Cost (yuan) Feed cost 5800 kg 5.2 yuan / kg 30160 Fingerling cost 6400 tails 0.3 yuan / tail 1920 Electricity cost 44160 kWh 0.38 yuan / kWh 16780.8 Total 48860.8

[0136] The gross profit from cultivating one crop of tilapia in 2 fish ponds and the increase in the average income per unit area of land of the sugarcane field are calculated according to the actual marketable quantity of the fish, the marketable price, and the total cost excluding labor. The calculation results are shown in Table 4.

[0137] Table 4

[0138]

[0139] In Table 4, the increase in the average income per unit area of land of the sugarcane field = gross profit÷20 mu.

[0140] According to Table 4, the gross profit from cultivating one crop of tilapia in 2 fish ponds can increase the average income per unit area of land of the 20 - mu sugarcane field by 193.46 yuan per mu.

[0141] According to Table 2 and Table 4, the increase in the average income per unit area of land of the sugarcane field in the example compared to the control example is: 1440.32 yuan per mu + 193.46 yuan per mu = 1633.78 yuan per mu.

[0142] The present invention is applicable to the field of sugarcane cultivation and the field of cultivating plants with large water requirements during the growth process. By directly using the tail water generated from high-density fish farming for irrigation, harmless treatment and efficient utilization of tail water resources are achieved. The tail water contains certain organic fertilizer components, which can effectively supplement the nutrient elements required for plant growth, reduce the need for additional fertilization, and at the same time improve the fertility and water retention capacity of the soil, providing an environmentally friendly and efficient solution for the development of modern agriculture.

[0143] Through the comparative experiment between the example and the control example, after 5 months of tail water irrigation under the same planting conditions, the height of the sugarcane in the example is on average 60 - 70 cm higher than that in the control example. This indicates that the nutrient components contained in the tail water can significantly promote the rapid growth of sugarcane, improve its drought resistance and photosynthesis efficiency, optimize the growth environment of sugarcane, and further verify the effectiveness and applicability of the technology of the present invention.

[0144] After the sugarcane matures, through the statistics of the actual incoming factory quantity, the average mu yield of the sugarcane in the example is increased by 61.76% compared with the control example. Taking 20 mu of sugarcane fields as an example, the total income of the sugarcane in the example is 28,800 yuan higher than that in the control example, indicating that tail water irrigation not only improves the growth quality and yield of sugarcane, but also significantly increases the planting economic benefits, bringing considerable profit growth to the planters.

[0145] The present invention combines high-density fish farming with agricultural planting to establish an efficient agricultural model of resource recycling. The direct irrigation of tail water reduces the waste of water resources and the cost of tail water treatment in traditional irrigation, and at the same time significantly improves the yield and economic benefits of sugarcane. This technology is applicable to other fields of cultivating plants with large water requirements, has broad popularization potential and sustainable development value, and provides new ideas for agricultural water conservation and efficiency improvement.

[0146] Example 1: Small-scale sugarcane field irrigation system based on a single fish pond

[0147] 1. System configuration

[0148] Fish pond: 1, with a diameter of 8 meters and a depth of 1.5 meters, equipped with an aeration ring pipe (3 exhaust holes, with a diameter of 1.5 mm, and the total area of the openings is less than the cross-sectional area of the inner hole of the ring pipe).

[0149] Pre-filtration system: including a microfilter (filter screen aperture 150 mesh), a filtrate pool (capacity 1.5 cubic meters) and a solid fermentation pool.

[0150] Ultrafiltration system: using an organic membrane with a retention pore size of 0.05 μm.

[0151] Biological purification system: 1 sedimentation tank, 1 biological filter and 1 biological floating bed, and a pipeline type ultraviolet disinfection device.

[0152] Irrigation system: 1 liquid fertilizer storage tank, 1 fertilizer mixing tank, 1 irrigation water pump, and the sprinkler irrigation device includes 5 rocker nozzles, covering 10 mu of sugarcane fields.

[0153] 2. Operating steps

[0154] Install a dissolved oxygen monitor and an ammonia nitrogen monitor in the fish pond, adjust the oxygen supply system, and keep the dissolved oxygen content in the water body at 6 mg / L and the ammonia nitrogen content less than 0.5 mg / L.

[0155] The tail water enters the microfilter through the bottom drain valve, the filtrate enters the filtrate tank, and the filter residue enters the solid-state fermentation tank. The filtrate pump sends the filtrate into the ultrafiltration system, and the clear liquid is treated by the biological purification system and then enters the reservoir. The filtrate pump can also send the filtrate into the fertilizer mixing tank of the irrigation system and send it to the sprinkler irrigation device for irrigation.

[0156] During the sugarcane fertilization period, nitrogen, phosphorus, and potassium fertilizers are mixed in the liquid fertilizer storage tank and the fertilizer mixing tank and then sent to the sprinkler irrigation device for irrigation. The coverage range of the sprinkler head is adjusted to 360° to achieve uniform irrigation.

[0157] Example 2: Large-scale sugarcane field irrigation system based on multiple fish ponds

[0158] 1. System configuration

[0159] Fish ponds: 5, each with a diameter of 8 m and a depth of 1.5 m. All fish ponds are connected to the pre-filtration system through the main drainage pipe. The aeration ring pipes in the fish ponds all have 3 exhaust holes with a hole diameter of 2 mm.

[0160] Pre-filtration system: Microfilter (screen aperture 200 mesh), filtrate tank (capacity 10 cubic meters), and solid-state fermentation tank.

[0161] Ultrafiltration system: Adopt inorganic membrane with a cut-off pore size of 0.02 μm.

[0162] Biological purification system: 2 sedimentation tanks, 2 biological filter ponds, 2 biological floating beds, and a pipeline type ultraviolet disinfection device.

[0163] Irrigation system: 2 liquid fertilizer storage tanks, 2 fertilizer mixing tanks, 2 irrigation water pumps, and the sprinkler irrigation device includes 30 turbine nozzles, covering 50 mu of sugarcane fields.

[0164] 2. Operating steps

[0165] Each fish pond is equipped with a dissolved oxygen monitor and an ammonia nitrogen monitor. The automatic control system adjusts the opening degrees of the aeration ring pipe and the inlet valve according to the monitoring data to ensure that the dissolved oxygen content in the water body is 7 mg / L and the ammonia nitrogen content is less than 0.4 mg / L.

[0166] The tail water flows into the main drainage pipe through the bottom drain valve, enters the microfilter for treatment, the filtrate is sent to the ultrafiltration system, and the clear liquid is treated by the biological purification system and then enters the reservoir.

[0167] According to the water requirements of sugarcane at each growth stage, all or part of the filtrate is sent to the fertilizer mixing tank, mixed with liquid fertilizer in the fertilizer mixing tank, and then transported to the turbine nozzle by the irrigation water pump to achieve full-coverage irrigation. The soil moisture monitor monitors the soil moisture at different depths and automatically adjusts the irrigation frequency and time.

[0168] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A system combining land-based high-density fish farming and sugarcane intelligent irrigation, characterized in that: The system includes: fish pond, water reservoir, pre-filtration system, ultrafiltration system, oxygen supply system, biological purification system, irrigation system and automatic control system; The fish pond is provided with an aeration loop pipe, a liquid level sensor, an online dissolved oxygen monitor and an online ammonia nitrogen content monitor; The oxygenation ring pipe is connected to the oxygen supply system through a pipeline provided with an air inlet valve; The pre-filtration system comprises a microfilter, a solid-state fermentation tank, a filtrate tank and a filtrate pump; The ultrafiltration system comprises a clear liquid side and a concentrated liquid side, wherein the clear liquid side is connected to a purification water pool of a biological purification system, and the concentrated liquid side is connected to a sedimentation tank; The biological purification system includes a sedimentation tank, a biological filter, a biological floating bed, a purification pool, a purification pump and a pipeline ultraviolet disinfector; The irrigation system includes a liquid fertilizer storage tank, a fertilizer mixing barrel, an irrigation water pump, an irrigation water main pipe and a sprinkler device; The sprinkler irrigation device includes an irrigation water branch pipe, a soil moisture monitor and a sprinkler head; The automatic control system is connected to various monitoring devices and system components and is used to adjust the operating parameters of the system.

2. The system according to claim 1, characterized in that The bottom of the oxygen-increasing ring tube is provided with 2-3 rows of evenly distributed pores along the axial direction, the pore diameter is 1-3 mm, and the total opening area of ​​all pores is smaller than the cross-sectional area of ​​the inner hole of the oxygen-increasing ring tube.

3. The system according to claim 1, characterized in that The filter screen aperture of the microfilter is 100-250 meshes, the retention aperture of the ultrafiltration system is 0.02-0.1 μm, and the ultrafiltration system adopts an inorganic membrane or an organic membrane.

4. The system according to claim 1, characterized in that The sprinkler device of the irrigation system comprises an irrigation water branch pipe and a sprinkler head. The sprinkler head is a rocker arm sprinkler head, a turbine sprinkler head or a micro sprinkler head which can automatically rotate 360 ​​degrees, preferably a rocker arm sprinkler head or a turbine sprinkler head.

5. The system according to claim 1, characterized in that The soil moisture monitor is arranged in the soil within the spraying range of the sprinkler head, and monitors the moisture content of four soil layers of 20cm, 30cm, 40cm and 50cm, and is a single soil layer or multi-soil layer soil moisture monitor.

6. A method for combining land-based high-density fish farming with sugarcane intelligent irrigation, characterized in that: The following steps are involved: An aeration loop is set in the fish pond and connected to the oxygen supply system through a pipeline with an air inlet valve to increase the dissolved oxygen level in the water; The water from the bottom of the fish pond is introduced into the pre-filtration system through the bottom valve for solid-liquid separation. The separated filtrate is transported to the ultrafiltration system through the filtrate pump, and the filter residue enters the solid fermentation tank for the production of organic fertilizer. In the ultrafiltration system, the clear liquid side is connected to the purified water tank of the biological purification system, and the concentrated liquid side is connected to the sedimentation tank; In the biological purification system, the water is treated through the sedimentation tank, biological filter and biological floating bed. The treated water enters the purification tank and is transported to the water storage tank through the pipeline by the purification water pump; During the sugarcane irrigation stage, the liquid fertilizer is mixed with water through the liquid fertilizer storage tank and fertilizer mixing barrel of the irrigation system, and then transported to the sprinkler irrigation device of the sugarcane field through the irrigation water pump; According to the water demand of sugarcane and the feedback data from soil moisture sensors, the output flow rate of the irrigation pump and the irrigation time are adjusted through the intelligent control system; Different irrigation routes are used to transport the mixed water to the sugarcane field according to the water demand of sugarcane in different growth periods; during the vigorous growth period of sugarcane, the irrigation frequency and water volume are increased; during the slow growth period, the irrigation frequency is appropriately reduced; when sugarcane does not need irrigation, the tail water of the fish pond is purified by the ultrafiltration system and the biological purification system and then returned to the reservoir for recycling in the fish pond.

7. The method of combining land-based high-density fish farming with sugarcane intelligent irrigation according to claim 6, characterized in that: During sugarcane irrigation: The liquid fertilizer used is produced by fermenting the fish pond residue in a solid fermentation tank. The liquid fertilizer is mixed with the fish pond tail water according to the ratio set by the intelligent control system and then transported to the sugarcane field. The intelligent control system dynamically adjusts the spraying frequency, water volume and mixing ratio of the sprinkler according to the real-time monitoring of the sugarcane growth stage, soil moisture and nutrient requirements, ensuring the water-fertilizer balance required for sugarcane growth, while optimizing the recycling efficiency of the fish pond tail water.

8. The method according to claim 6, characterized in that In the irrigation system, the sprinkler device includes an irrigation water branch pipe and a sprinkler head. The sprinkler head is a rocker-arm sprinkler head, a turbine sprinkler head or a micro sprinkler head. An irrigation water diversion valve is provided on the irrigation water branch pipe. The soil moisture monitor and the irrigation water diversion valve are matched in a 1:1 ratio.

9. The method according to claim 6, characterized in that The automatic control system is used to adjust the opening of the air inlet valve of the fish pond aeration loop to keep the dissolved oxygen content in the water between 5 and 8 mg / L, and to adjust the opening of the fish pond water inlet valve to keep the ammonia nitrogen content less than 0.5 mg / L.

10. The method according to claim 6, characterized in that The ratio of the total volume of the fish pond to the irrigation area of ​​the sugarcane field is 5 to 10:1, preferably 6 to 8:1.

Images