An ecological safety-based groundwater irrigation carrying capacity improvement method and system

Abstract

The application discloses an ecological safety-based groundwater irrigation carrying capacity improving method and system, which purifies irrigation return water in a more ecological form, and provides more qualified return water for improving groundwater carrying capacity; the method wraps bacteria and nutrient substances suitable for initial growth of the bacteria in degradable water purification bags, enriches the number and types of beneficial bacteria groups in soil, adjusts a previous monotonous water purification system, and prolongs the continuous period of biological water purification and timely supplement according to subsequent conditions; the bacteria and the nutrient substances suitable for initial growth of the bacteria are wrapped in the degradable water purification bags, the number and types of beneficial bacteria groups in soil are enriched, a previous monotonous water purification system is adjusted, the continuous period of biological water purification is prolonged, and timely supplement according to subsequent conditions is realized, and ecological safety requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of groundwater carrying capacity improvement, and particularly relates to a groundwater irrigation carrying capacity improvement method and system based on ecological safety. BACKGROUND

[0002] Water resources in China are unevenly distributed, especially in the semi-arid and arid regions in the north, agricultural irrigation needs to rely on groundwater resources, and the demand for groundwater is also increasing with the development of society. Groundwater resources, as an extremely important and valuable resource, reasonable development and protection are the top priority for sustainable utilization, which is also conducive to the healthy circulation of regional groundwater and the stable development of regional agricultural economy. Groundwater resource carrying capacity refers to the ability of groundwater resources to supply water for industrial and agricultural production, people's life and ecological environment protection under certain technical and economic level and social production conditions in the future. The main methods to improve the carrying capacity of groundwater resources are: ① fully tap the potential of groundwater resources, maximize the effective energy, and at the same time pay attention to unreasonable conditions such as overexploitation, such as recharging in the wet season, reducing pollution and waste during exploitation ② by relatively increasing groundwater resources, such as developing agricultural water saving, improving irrigation mode, and reducing crop water loss ③ indirect promotion by using biological technology engineering, such as planting crops according to local conditions and adjusting industrial structure. Groundwater recharge is to inject surface water or other water sources into the ground to supplement groundwater, so as to increase the amount of groundwater resources, alleviate the continuous decline of groundwater level, purify water quality, curb seawater intrusion and other ecological environmental benefits, also known as artificial groundwater recharge and groundwater recharge. Managed Aquifer Recharge (MAR) is a technical method of storing water in suitable aquifers with the purpose of ensuring human health and environmental safety, and a series of management measures to improve the ecological environment. Through water recovery, seasonal water shortage is solved, and considerable economic benefits are obtained. Irrigation return water refers to the irrigation water discharged from the field and channel or seeped into the ground and collected into ditches, channels, rivers and underground aquifers, becoming a reusable water source. For agricultural areas, irrigation return water can be used as one of the water sources for groundwater recharge.

[0003] The existing irrigation return water recharge treatment method is basically water treatment and water infiltration (normal pressure or pressurized infiltration). When the water treatment is performed, if a large green water machine is selected, the cost is high and the time is long, which is not conducive to ecological circulation. If the return water is recharged by using a natural filter layer such as sand and stone, because the general filter layer is a layer-by-layer mode, the irrigation return water is sequentially infiltrated into the aquifer after passing through each layer. First, the soil and sand filtering effect is poor, and the pesticide residues, fertilizer residues, insect eggs and harmful bacteria in the return water are not completely treated, which can easily cause groundwater pollution. Second, the soil composition is different in different regions, and the microbial composition in the soil is also different. Most soils and filter layers have poor adsorption and conversion effect on heavy metals and organic matter in the water body. If artificial chemical improvement is not relied on, the untreated water body will eventually pollute the groundwater, which does not meet the ecological safety requirements.

[0004] Therefore, the technical personnel in the field are committed to developing an ecological safety-based groundwater irrigation carrying capacity improvement method and system to solve the above problems of the prior art. SUMMARY

[0005] In view of the above defects of the prior art, the technical problem to be solved by the present application is that the existing technology cannot effectively and safely treat irrigation return water by using natural filtration, thereby causing the defect problem of groundwater pollution.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application provides an ecological safety-based groundwater irrigation carrying capacity improvement method, which comprises the following steps:

[0007] Step 1, collecting geological information and irrigation return water quality information of a selected region, and determining the construction position of the recharge area;

[0008] Step 2, configuring a microbial modifier, and filling the microbial modifier into a water purification bag;

[0009] Step 3, digging a water storage pool, filling a filter layer, and arranging a pipeline;

[0010] Step 4, draining the surface irrigation return water to the water storage pool, treating and pressurizing the return water by the filter layer, and then recharging the return water into the aquifer;

[0011] Step 5, regularly checking the quality of the recharge water, and subsequently supplementing the microbial modifier by pressurizing;

[0012] Further, the geological information includes two or more of the soil type, the soil moisture content, the aquifer position and the aquiclude position of the region; and the irrigation return water quality information includes two or more of the heavy metal concentration, the residual chlorine, the chemical oxygen demand, the total number of bacteria, the pH value, the total phosphorus, the ammonia nitrogen and the suspended solids.

[0013] Further, the microbial modifier comprises a bacterial strain, a nutrient solution; the bacterial strain is selected from one or more of Bacillus, Pseudomonas, Bacillus subtilis, Alcaligenes;

[0014] Further, the number of filter layers is at least two;

[0015] The application provides a system applying the method, which comprises a water storage pool, a drainage pipe, a tube well set, and a feeding set.

[0016] The water storage pool comprises a pool wall, a pool surface filter screen, a primary filter layer, and a secondary filter layer; the water storage pool is provided with the pool wall except the bottom surface; the pool surface filter screen is laid on the pool surface of the water storage pool; the primary filter layer is composed of one or more of large-diameter particle goose pebbles, quartz sand, volcanic rock, deer swamp soil, anthracite, and magnetite; and the secondary filter layer is composed of one or more of small-diameter particle fine yellow sand, coral sand, activated carbon, and slag.

[0017] One end of the drainage pipe is placed in the water storage pool, and the other end is connected with a return water drainage channel of an irrigation area.

[0018] The tube well set is arranged underground and comprises a water permeable membrane, a drainage pipe, a water pump, and a tube well; the water permeable membrane is installed on the upper side of the drainage pipe and directly contacts the sandstone above.

[0019] The feeding set is installed on the pool edge of the water storage pool and comprises a pressure pump, a feeder, a feeding pipe, a guide pipe, and a clean water bag; the pressure pump is connected with the feeder at the upper end and connected with the feeding pipe at the lower end; the feeding pipe is installed at the middle position of the secondary filter layer; the contact part of the feeding pipe with the secondary filter layer is connected with the guide pipe with a smaller diameter; the guide pipe is connected with the clean water bag; and the clean water bag comprises a coating and soil, organic matter, inorganic salt, an auxiliary agent, and a microbial agent wrapped in the coating.

[0020] Further, the pool wall is made of a more water-impermeable material than the filter layer.

[0021] Further, the surface of the coating is a close grid, which ensures that the soil is wrapped but allows the solution to pass through; and the coating material is one of biodegradable polypropylene carbonate, polylactic acid, poly-3-hydroxyalkanoate, poly-epsilon-caprolactone, and polyvinyl alcohol.

[0022] By adopting the above scheme, the underground water irrigation carrying capacity improvement method and system based on ecological safety have the following advantages:

[0023] (1) The underground water irrigation carrying capacity improvement method and system based on ecological safety introduce the microbial clean water modifier into the filter layer, utilize the biological clean water, improve the clean water capacity of the filter layer, reduce the influence of the irrigation return water quality on the underground water quality, introduce more qualified supplementary water, and improve the underground water carrying capacity.

[0024] (2) The present invention provides a method and system for improving the carrying capacity of groundwater irrigation based on ecological safety. The method and system encapsulates the microbial strains and nutrients suitable for the initial growth of the microbial strains in a biodegradable water purification bag, which enriches the number and types of beneficial microbial communities in the soil, adjusts the previously monotonous water purification system, and provides a long-lasting biological water purification cycle that can be replenished as needed.

[0025] In summary, the present invention discloses a method and system for enhancing the carrying capacity of groundwater irrigation based on ecological safety. This method encapsulates microbial strains and suitable nutrients for their initial growth within a biodegradable water purification bag, enriching the quantity and variety of beneficial bacteria in the soil. This improves the previously monotonous water purification system, providing a long-lasting biological water purification cycle that can be replenished as needed.

[0026] The following will further explain the concept, specific technical solution and technical effects of the present invention in conjunction with specific embodiments, so as to fully understand the purpose, features and effects of the present invention. Attached Figure Description

[0027] Figure 1 A schematic diagram of a system that applies a groundwater irrigation capacity enhancement method based on ecological security;

[0028] Figure 2 A schematic diagram showing the connection between the water purification bag 5 and the feed pipe 9;

[0029] In the diagram, 1 is the pool wall; 2 is the pool surface filter screen; 3 is the primary filter layer; 4 is the secondary filter layer; 5 is the water purification bag; 501 is the coating; 6 is the drainage pipe; 7 is the well casing; 701 is the permeable membrane; 8 is the feeding casing; 9 is the feed pipe; and 901 is the feed guide pipe. Detailed Implementation

[0030] The following describes several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, which are described exemplarily, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0031] If there are experimental methods that do not specify the conditions, they are usually carried out according to the standard conditions, such as the relevant instructions or manuals.

[0032] like Figure 1 As shown, the present invention relates to a method and system for enhancing the carrying capacity of groundwater irrigation based on ecological safety. Example 1: Method for enhancing the carrying capacity of groundwater irrigation based on ecological safety.

[0033] Step 1, collect the geological information of the selected area (soil type, aquifer location, aquifuge location), according to the soil and the location of the aquifer and the aquifuge, the distribution of farmland and water channel in the irrigation area is comprehensively selected, the location, size and pipeline distribution of the recharge area water storage tank are selected; Collecting irrigation return water quality information (heavy metal concentration, residual chlorine, chemical oxygen demand, total bacterial count, pH value, total phosphorus, ammonia nitrogen), according to the water quality information to determine the types of pollutants exceeding the standard, solutions and recharge water treatment speed;

[0034] Step 2, configure microbial modifier, this time of water purification is mainly aimed at the problem of exceeding the standard of carbon, nitrogen and phosphorus compounds in recharge water, select commercially available bacillus species, activate in advance under the condition of sufficient dissolved oxygen, 1 kg of bacillus is mixed with 20 kg of water for activation, and 10%~20% of the total weight of glucose is added to the water, after activation, the microbial modifier is poured into the water purification bag filled with sugar, sterile soil and inorganic salt, stirred evenly and sealed the water purification bag;

[0035] Step 3, dig the water storage tank, arrange the pipeline according to the preset pipeline distribution of step 1; Fill the primary filter layer and the secondary filter layer, and the filling material is selected from goose eggstones, quartz sand, fine yellow sand, coral sand and activated carbon;

[0036] Step 4, surface irrigation return water is drained to the water tank, recharge water contacts the water purification bag when passing through the secondary filter layer, the activated bacillus in the water purification bag seeps out and purifies the water, the purified recharge water enters the drain pipe through the water permeable membrane, and then is pumped and pressurized to recharge to the aquifer;

[0037] Step 5, regularly check the quality of recharge water, and supplement the microbial modifier by pressurizing;

[0038] Comparative example 2, filtration tank water purification and recharge method with overlapping filter layers

[0039] Step 1, dig the water storage tank, fill the filter layer, and arrange the pipeline; The filter layer is set to three layers, and the particle diameter decreases from top to bottom, and the materials used are goose eggstones, quartz sand, fine yellow sand, coral sand and activated carbon;

[0040] Step 2, surface irrigation return water is drained to the water tank, treated by the filter layer, pressurized and then recharged to the aquifer;

[0041] Step 3, regularly check the quality of recharge water;

[0042] Comparative analysis of Example 1 and Comparative Example 2 shows that, in the water quality sampling inspection of Example 1, the 10 water samples of different times all meet the requirements of irrigation water, while the qualified rate of the water samples of Comparative Example 2 is only 70%, so it is concluded that the underground water irrigation carrying capacity improvement method and system based on ecological safety of the application purifies the irrigation return water in a more ecological form, and provides more qualified return water for improving the underground water carrying capacity; the method wraps the bacteria and the nutrient substances suitable for the initial growth of the bacteria in the degradable water purification bag, enriches the number and types of the beneficial bacteria groups in the soil, adjusts the previous monotonous water purification system, and the biological water purification has a long continuous period and can be supplemented in time according to the situation; the bacteria and the nutrient substances suitable for the initial growth of the bacteria are wrapped in the degradable water purification bag, the number and types of the beneficial bacteria groups in the soil are enriched, the previous monotonous water purification system is adjusted, the biological water purification has a long continuous period and can be supplemented in time according to the situation, and the ecological safety requirements are met.

[0043] The preferred embodiments of the application are described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and changes without creative work based on the concept of the application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the prior art within the concept of the application should be within the protection scope determined by the claims.

Claims

1. A method for enhancing the carrying capacity of groundwater irrigation based on ecological security, characterized in that, The method includes the following steps: Step 1: Collect geological information and irrigation return water quality information of the selected area to determine the location of the recharge area; the geological information includes two or more of the following: soil type, soil moisture content, aquifer location, and impermeable layer location; the irrigation return water quality information includes two or more of the following: heavy metal concentration, residual chlorine, chemical oxygen demand, total bacterial count, pH value, total phosphorus, ammonia nitrogen, and suspended solids. Step 2: Prepare the microbial improver and fill it into the water purification bag (5); the microbial improver includes bacterial strains and nutrient solution; the bacterial strains are selected from one or more of Bacillus, Pseudomonas, Bacillus subtilis, and Alkalibacillus; the water purification bag (5) includes a coating (501) and soil, organic matter, inorganic salts, auxiliary agents, and microbial agents wrapped in the coating; the surface of the coating (501) is a tight mesh to ensure that the soil is wrapped and the solution can pass through; the material of the coating (501) is one of biodegradable polypropylene carbonate, polylactic acid, poly(3-hydroxyalkanoate), and poly(ε-caprolactone); Step 3: Deepen the water storage tank, fill it with a filter layer, and lay out the pipes; the minimum number of filter layers is two. Step 4: Surface irrigation return water is diverted to a water tank, treated by a filtration layer, pressurized, and then reinjected into the aquifer; Step 5: Regularly test the quality of the reinjection water, and then pump in supplementary microbial conditioner under pressure. The method is implemented using an ecologically safe groundwater irrigation carrying capacity enhancement system. The system includes a feeding kit (8), which includes a pressurizing pump, a feeder, a feed pipe (9), a guide pipe (901), and a clean water bag (5). The pressurizing pump is connected to the feeder at the top and the feed pipe (9) at the bottom. The feed pipe (9) is connected to the guide pipe (901). The guide pipe (901) is connected to the clean water bag (5).

2. A groundwater irrigation carrying capacity enhancement system based on ecological safety, applied to the method of claim 1, characterized in that, The system includes a water storage tank, a diversion pipe (6), a well casing (7), and a feeding casing (8); the water storage tank includes a tank wall (1), a surface filter screen (2), a primary filter layer (3), and a secondary filter layer (4); the tank wall (1) is made of a material that is less permeable than the filter layer; the water storage tank is equipped with a tank wall (1) except for the bottom surface; the surface filter screen (2) is laid flat on the surface of the water storage tank; the primary filter layer (3) is composed of one or more of the following: large-diameter pebbles, quartz sand, volcanic rock, Kanuma soil, anthracite, and magnetite; the secondary filter layer (4) is composed of one or more of the following: small-diameter fine yellow sand, coral sand, activated carbon, and slag. One end of the diversion pipe (6) is placed in the water storage tank, and the other end is connected to the return water diversion channel of the irrigation area; The well casing (7) is placed underground and includes a drainage pipe, a water pump and a filling well; the permeable membrane is installed on the upper side of the drainage pipe and is in direct contact with the sand and gravel above; The feeding assembly (8) is installed at the edge of the water storage tank and includes a pressurizing pump, a feeder, a feed pipe (9), a guide pipe (901), and a water purification bag (5). The pressurizing pump is connected to the feeder at the top and the feed pipe (9) at the bottom. The feed pipe (9) is installed in the middle of the secondary filter layer (4). The part of the feed pipe (9) that contacts the secondary filter layer (4) is connected to the guide pipe (901). The guide pipe (901) is connected to the water purification bag (5). The water purification bag (5) includes a coating (501) and soil, organic matter, inorganic salts, auxiliary agents, and microbial agents wrapped in the coating (501). The surface of the coating (501) is a tight mesh to ensure that the soil is wrapped and that the solution can pass through. The material of the coating (501) is one of the following: biodegradable polypropylene carbonate, polylactic acid, poly(3-hydroxyalkanoate), and poly(ε-caprolactone).

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