Weight losing management and control method for recycling farmland tail water

Abstract

The invention relates to the technical field of tail water weight-losing treatment, in particular to a weight-losing management and control method for recycling farmland tail water. A corresponding neutralizer or precipitant is arranged in the farmland tail water, the reagent amount of the neutralizer or precipitant is determined in combination with the reaction state, the weight losing and disinfecting steps of the farmland tail water are accurately controlled, and the stirring time of the neutralizer or precipitant in the farmland tail water is jointly calculated in combination with a temperature factor and an illumination factor. Therefore, the treatment precision of weight loss treatment of the farmland tail water is improved, meanwhile, whether the stirring device can execute corresponding stirring treatment operation or not can be determined conveniently, it is ensured that weight loss treatment of the farmland tail water can be completed, and reasonable and effective treatment and recovery of the farmland tail water are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of tail water weight loss treatment, and in particular to a weight loss control method for recycling farmland tail water. Background Art

[0002] Irrigation is the process of artificially providing water to farmland to meet the needs of crop growth. Irrigation can use water sources such as rivers, lakes, groundwater or reservoirs to distribute water to farmland through various irrigation systems (such as sprinkler irrigation, drip irrigation, furrow irrigation, etc.). Effective irrigation can increase crop yields, improve soil quality, and ensure crop growth in the event of drought or insufficient rainfall. Among them, farmland tailwater is the water flowing out after agricultural irrigation, which often contains excessive fertilizers and pesticides, and has become an important source of agricultural non-point source pollution. How to effectively manage the discharge, treatment and recycling of farmland tailwater can not only reduce fertilizer loss and protect the environment, but also improve resource utilization efficiency. Therefore, it is of great agricultural and environmental significance to propose a weight loss control method for the recycling of farmland tailwater. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the present invention provides a weight loss control method for the recycling of farmland tail water, which can effectively solve the problem that the prior art cannot reasonably and effectively treat farmland tail water, resulting in inconvenience in recycling.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a weight loss control method for recycling farmland tail water, comprising the following steps: Step 1: Set up a tailwater collection system to centrally collect farmland tailwater flowing out after farmland irrigation; Step 2: The collected farmland tail water is subjected to weight loss and disinfection treatment to separate the chemical components in the farmland tail water to obtain purified farmland tail water, wherein the weight loss treatment step includes: According to the chemical composition of farmland tailwater, determine the corresponding neutralizer or precipitant to separate pollutants, including: If it is determined to be a neutralizing agent or a precipitating agent, calculate the reagent amount of the neutralizing agent or the precipitating agent respectively; Step 3: Stir the neutralizer or precipitant in the farmland tail water through a stirring device to promote the reaction, wherein: The stirring time of the farmland tail water is determined by the stirring device. The method for determining the stirring time is as follows: Determine the chemical reaction rate between pollutants in farmland tail water and neutralizers or precipitants; introduce temperature and light factors to determine the chemical reaction rate; Comprehensively calculate the stirring time of farmland tail water; Step 4: Combine the linear regression model to predict the risk coefficient of the stirring device, determine whether the stirring equipment can stir the farmland tail water, and determine whether to generate a stirring signal synchronously; Step 5: If the mixing is completed, the farmland tail water is subjected to quality inspection to determine whether the farmland tail water meets the recycling standards. If it meets the standards, a weight loss completion signal is generated and output.

[0005] Furthermore, the farmland tail water is acidic, and an alkaline reagent, sodium hydroxide, is added. or lime water Neutralize excess hydrogen ions:

[0006] The farmland tailwater Adjust to a neutral range of 6.5-8.5.

[0007] Further, the precipitant comprises: Hydroxide precipitation method: Add sodium hydroxide or lime water , reacts with heavy metal ions to form hydroxide precipitates, that is, copper ions and sodium hydroxide react to form copper hydroxide precipitates:

[0008] Phosphate precipitation method: For tail water containing phosphate ions, aluminum chloride is commonly used or ferric chloride As precipitant: .

[0009] If it is a neutralizing agent, and the neutralizing agent is sodium hydroxide: According to the equivalent formula of acid-base neutralization reaction:

[0010] Where: is the mass of sodium hydroxide, is the concentration of hydrogen ions in the solution, is the volume of farmland tailwater, is the molar mass of sodium hydroxide, by adjusting To achieve the value of farmland tailwater Calculate the amount of sodium hydroxide that needs to be added based on the change in

[0011] If the farmland tail water contains phosphate ions According to the reaction equation:

[0012] According to the reaction ratio, 1 mole of Can precipitate 1 mol If the farmland tailwater The concentration is , needed The amount is:

[0013] Where: is the mass of alumina to be added, is the concentration of phosphate, The amount of aluminum chloride is calculated by adjusting the initial concentration of phosphate ions and the final required concentration.

[0014] The chemical reaction rate is determined according to the following relationship:

[0015] Where: is the chemical reaction rate, is the temperature reaction rate constant, is the concentration of the pollutant, is the reaction order, which depends on the type of reaction, is the reaction rate constant of illumination, is the light intensity.

[0016] Furthermore, the method for determining the temperature reaction rate constant is: The temperature reaction rate constant was calculated using the Arrhenius equation, including: Get the value of temperature reaction rate constant at different temperatures; Combined with the Arrhenius equation:

[0017] Where: is the temperature reaction rate constant, is the frequency factor, is the activation energy, is the gas constant, is the absolute temperature; Linearize the Arrhenius equations:

[0018] Transformed into a linear regression model In the form of:

[0019] collect and Perform linear regression on the data points and get ; Calculate the temperature reaction rate constant: .

[0020] Furthermore, the stirring time is determined according to the following relationship:

[0021] In the formula, is the stirring time, is the volume of farmland tailwater to be treated, is the effective contact area of ​​the stirring device.

[0022] Furthermore, the mathematical model of the risk coefficient is:

[0023] Where: is the predicted risk factor, is the intercept term, is the risk independent variable affecting the stirring device, is the corresponding weight coefficient, is the error term; Get the preset risk factor range and the current risk factor The risk factor range in which the device is located, and the subsequent estimated usage time corresponding to the risk factor range , the estimated usage time And stirring time Comparison judgment: like , generating a stirring signal and outputting it to the stirring device for execution; Otherwise, no stirring signal is generated.

[0024] When judging whether the farmland tail water meets the recycling standards, it is judged whether the farmland tail water meets the physical indicators, chemical indicators and microbial indicators. Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: By setting corresponding neutralizers or precipitants in the farmland tail water and determining the reagent dosage of the neutralizer or precipitant in combination with the reaction state, precise control of the farmland tail water weight loss and disinfection steps can be achieved, and the stirring time of the neutralizer or precipitant in the farmland tail water can be calculated in combination with the temperature factor and the light factor, so as to improve the treatment accuracy of the farmland tail water weight loss treatment. At the same time, it can be easy to clarify whether the stirring device can perform the corresponding stirring treatment operation, so as to ensure that the farmland tail water can complete the weight loss treatment, thereby realizing the reasonable and effective treatment and recovery of the farmland tail water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The figure is a flow chart of the overall method of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The present invention will be further described below in conjunction with the embodiments.

[0029] Example 1 (see Figure 1 ): A method for controlling the weight loss of recycled farmland tail water, comprising the following steps: Step 1: Set up a tailwater collection system at the farmland drainage outlet, establish a network of drainage ditches and reservoirs, and centrally collect the farmland tailwater flowing out after farmland irrigation; Among them, when establishing the drainage ditch and reservoir system, it is necessary to plan the flow route of tailwater according to the terrain, reduce soil erosion, and optimize water resource recovery.

[0030] Step 2: The farmland tail water collected by the tail water collection system is subjected to weight loss and disinfection treatment to separate the chemical components in the farmland tail water and obtain the purified farmland tail water for subsequent secondary irrigation of the farmland to save water resources.

[0031] In the above, the specific steps involved in the weight loss treatment of farmland tail water are: S100, detect the chemical composition and concentration of farmland tail water to determine whether it contains: Heavy metal ions (such as copper, cadmium, lead, etc.), recorded as ; Phosphate ion, denoted as ; The hydrogen ion concentration is recorded as , which affects the occurrence of chemical reactions; S200, determine the appropriate neutralizer or precipitant according to the chemical composition of the farmland tail water to separate the pollutants; Neutralizer: If the farmland tail water is acidic, add alkaline reagents such as sodium hydroxide or lime water Neutralize excess hydrogen ions:

[0032] In this way, the farmland tailwater Adjust to a neutral range of 6.5-8.5; Precipitating agent: Including hydroxide precipitation method: Add sodium hydroxide or lime water , reacts with heavy metal ions to form hydroxide precipitates, such as copper ions and sodium hydroxide to form copper hydroxide precipitates:

[0033] Phosphate precipitation method: For tail water containing phosphate ions, aluminum chloride is commonly used or ferric chloride As precipitant: .

[0034] S300, calculate the amount of reagent added: SA, determine the amount of neutralizing agent or precipitating agent: If it is a neutralizing agent, and the neutralizing agent is sodium hydroxide: The amount of neutralizer added depends on the pH difference of the tail water and the acid-base equivalent that needs to be neutralized. According to the equivalent formula of the acid-base neutralization reaction:

[0035] Where: is the mass of sodium hydroxide (g, i.e. the amount of neutralizer added), is the concentration of hydrogen ions in the solution , is the volume of farmland tailwater (L), is the molar mass of sodium hydroxide, by adjusting To achieve the value of farmland tailwater Calculate the amount of sodium hydroxide that needs to be added based on the change in Calculation of reagent amounts of ST and precipitant: If the farmland tail water contains phosphate ions , according to the above reaction equation:

[0036] According to the reaction ratio, 1 mole of Can precipitate 1 mol If the farmland tailwater The concentration is , then what is needed The amount is:

[0037] Where: is the mass of alumina to be added (g), is the concentration of phosphate , is the molar mass of aluminum oxide, and the appropriate amount of aluminum chloride is calculated by adjusting the initial concentration of phosphate ions and the final required concentration; Therefore, according to the above reaction results, an appropriate amount of neutralizer or precipitant is added to the farmland tail water to achieve the weight loss treatment of the farmland tail water.

[0038] Step 3: Stir the neutralizer or precipitant added to the farmland tail water by a stirring device to make it evenly distributed in the farmland tail water to promote the complete reaction, wherein: The stirring time of the farmland tail water is determined by the stirring device. The method for determining the stirring time is as follows: SR. Determine the chemical reaction rate between pollutants and neutralizers or precipitants in farmland tailwater: Introducing temperature and light factors to determine chemical reaction rates :

[0039] Where: is the temperature reaction rate constant, which is temperature-dependent. is the concentration of the pollutant, is the reaction order, which depends on the type of reaction, is the reaction rate constant of illumination, is the light intensity; Furthermore, in the above scheme, the method for determining the temperature reaction rate constant is: The temperature reaction rate constant was calculated using the Arrhenius equation, including: Get the value of temperature reaction rate constant at different temperatures; Combined with the Arrhenius equation:

[0040] Where: is the temperature reaction rate constant, is the frequency factor, is the activation energy, is the gas constant , is the absolute temperature; Linearize the Arrhenius equations:

[0041] Transformed into a linear regression model In the form of:

[0042] collect and Perform linear regression on the data points and get ; Calculate the temperature reaction rate constant: .

[0043] Then, by clarifying the temperature reaction rate constant, the chemical reaction rate can be calculated more accurately, so that the stirring time can be more accurately obtained later. .

[0044] SP, calculate stirring time

[0045]

[0046] In the formula, is the stirring time, is the volume of farmland tailwater to be treated, is the effective contact area of ​​the stirring device. The required stirring time is actually determined by introducing the temperature influence factor and the light influence factor. , in order to achieve precise weight loss control of farmland tail water.

[0047] Step 4: Use the linear regression model to predict the risk factor of the mixing device, and determine the subsequent use time of the mixing equipment based on the risk factor. And stirring time To determine whether the mixing equipment can mix the farmland tail water, the risk coefficient is calculated as follows: Where: is the predicted risk factor, is the intercept term, The risk independent variables that affect the stirring device include usage time, ambient temperature, operating pressure, ambient humidity, failure time, number of failures, etc. is the corresponding weight coefficient, is the error term; Get the preset risk factor range and the current risk factor , risk factor threshold Includes multiple risk factor intervals of different levels, and then determines the subsequent estimated usage time corresponding to the risk factor interval , the estimated usage time And stirring time Comparison judgment: like , it means that the stirring device is able to perform the stirring operation of the farmland tail water, and a stirring signal is generated and output to the stirring device for execution; Otherwise, no stirring signal is generated to the stirring device.

[0048] Step 5: After the farmland tail water is stirred, the quality of the farmland tail water is tested to determine whether the farmland tail water meets the recycling standards, where the recycling standards include: Physical indicators: turbidity, color and odor of farmland tailwater; Chemical indicators: value, dissolved oxygen concentration; Microbiological indicators: Escherichia coli, total bacterial count; It should be noted that as long as the above-mentioned recycling standards are met, a weight loss completion signal can be simultaneously generated and output to the terminal device to indicate that the terminal personnel can dispose of the farmland tail water. Therefore, the farmland tail water obtained by the above-mentioned recycling standards can be used for subsequent secondary utilization in farmland.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling weight loss by recycling farmland tail water, characterized in that: The steps include: Step 1: Set up a tailwater collection system to centrally collect farmland tailwater flowing out after farmland irrigation; Step 2: The collected farmland tail water is subjected to weight loss and disinfection treatment to separate the chemical components in the farmland tail water to obtain purified farmland tail water, wherein the weight loss treatment step includes: According to the chemical composition of farmland tailwater, determine the corresponding neutralizer or precipitant to separate pollutants, including: If it is determined to be a neutralizing agent or a precipitating agent, calculate the reagent amount of the neutralizing agent or the precipitating agent respectively; Step 3: Stir the neutralizer or precipitant in the farmland tail water through a stirring device to promote the reaction, wherein: The stirring time of the farmland tail water is determined by the stirring device. The method for determining the stirring time is as follows: Determine the chemical reaction rates between pollutants and neutralizers or precipitants in farm tailwater; Introduce temperature and light factors to determine the chemical reaction rate; The chemical reaction rate is determined according to the following relationship: ； Where: is the chemical reaction rate, is the temperature reaction rate constant, is the concentration of the pollutant, is the reaction order, which depends on the type of reaction, is the reaction rate constant of illumination, is the light intensity; Comprehensively calculate the stirring time of farmland tail water; Step 4: Combine the linear regression model to predict the risk coefficient of the stirring device, determine whether the stirring equipment can stir the farmland tail water, and determine whether to generate a stirring signal synchronously; Step 5: If the mixing is completed, the farmland tail water is subjected to quality inspection to determine whether the farmland tail water meets the recycling standards. If it meets the standards, a weight loss completion signal is generated and output.

2. The weight loss control method for recycling farmland tail water according to claim 1, characterized in that: The farmland tail water is acidic, and alkaline reagents, sodium hydroxide or lime water are added to neutralize excess hydrogen ions: ； Adjust the pH of farmland tail water to a neutral range of 6.5-8.

5.

3. The weight loss control method for recycling farmland tail water according to claim 1, characterized in that: The precipitating agent comprises: Hydroxide precipitation method: Add sodium hydroxide or lime water to react with heavy metal ions to form hydroxide precipitates, that is, copper ions react with sodium hydroxide to form copper hydroxide precipitates: ； Phosphate precipitation method: For tail water containing phosphate ions, aluminum chloride or ferric chloride is often used as a precipitant: 。 4. The weight loss control method for recycling farmland tail water according to claim 1, characterized in that: If it is a neutralizing agent, and the neutralizing agent is sodium hydroxide: According to the equivalent formula of acid-base neutralization reaction: ； Where: is the mass of sodium hydroxide, is the concentration of hydrogen ions in the solution, is the volume of farmland tailwater, is the molar mass of sodium hydroxide, and by adjusting To achieve the value of farmland tailwater Calculate the amount of sodium hydroxide that needs to be added based on the change in 5. The weight loss control method for recycling farmland tail water according to claim 1, characterized in that: If the farmland tail water contains phosphate ions , according to the reaction equation: ； According to the reaction ratio, 1 mole of Can precipitate 1 mol If the farmland tailwater The concentration is , needed The amount is: ； Where: is the mass of alumina to be added, is the concentration of phosphate, The amount of aluminum chloride is calculated by adjusting the initial concentration of phosphate ions and the final required concentration.

6. The weight loss control method for recycling farmland tail water according to claim 1, characterized in that: The method for determining the temperature reaction rate constant is: The temperature reaction rate constant was calculated using the Arrhenius equation, including: Get the value of temperature reaction rate constant at different temperatures; Combined with the Arrhenius equation: ； Where: is the temperature reaction rate constant, is the frequency factor, is the activation energy, is the gas constant, is the absolute temperature; Linearize the Arrhenius equations: ； Transformed into a linear regression model In the form of: ； collect and Perform linear regression on the data points and get ; Calculate the temperature reaction rate constant: 。 7. The weight loss control method for recycling farmland tail water according to claim 6, characterized in that: The stirring time is determined according to the following relationship: ； In the formula, is the stirring time, is the volume of farmland tailwater to be treated, is the effective contact area of ​​the stirring device.

8. The weight loss control method for recycling farmland tail water according to claim 1, characterized in that: The mathematical model of the risk coefficient is: ； Where: is the predicted risk factor, is the intercept term, is the risk independent variable affecting the stirring device, is the corresponding weight coefficient, is the error term; Get the preset risk factor range and the current risk factor The risk factor range in which the device is located, and the subsequent estimated usage time corresponding to the risk factor range , the estimated usage time And stirring time Comparison judgment: like , a stirring signal is generated and output to the stirring device for execution; otherwise, no stirring signal is generated.

9. The weight loss control method for recycling farmland tail water according to claim 1, characterized in that: When judging whether the farmland tail water meets the recycling standard, it is judged whether the farmland tail water meets the physical index, chemical index and microbiological index.

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