Water quality conditioning agent containing modified sodium alginate as well as preparation method and application of water quality conditioning agent

Abstract

The invention relates to a water quality regulator containing modified sodium alginate as well as a preparation method and application of the water quality regulator, and belongs to the technical field of agricultural water treatment agents. According to the preparation method of the water quality conditioning agent containing modified sodium alginate provided by the invention, aldehydes alginate, poly-gamma-glutamic acid, sodium alginate, carrageenan, phosphoric acid / phosphate and citric acid / citrate are matched for use, so that the water quality conditioning agent can be used for water quality regulation and scale removal in large-scale planting drip irrigation belts; the oxidation degree level of alginic acid aldehyde is controlled by controlling the pH value of the water quality regulator, the stable effect of descaling is guaranteed, meanwhile, the water quality regulator can enter soil along with drip irrigation water, alkaline soil is regulated, microbial flora is activated, the fertilizer utilization rate is increased, and the growth of crops is promoted; in addition, the water quality conditioning agent is natural degradable components, cannot cause pollution and damage to the soil environment, conforms to the green and environment-friendly concept of modern agriculture, and has important application value for the production operation mode of agriculture, especially agricultural drip irrigation.

Description

Technical Field

[0001] The present application relates to a water quality regulator containing modified sodium alginate, its preparation method and application, and belongs to the technical field of agricultural water treatment agents. Background Art

[0002] Drip irrigation tapes use drip irrigation pipes to deliver water to the roots of crops for local irrigation through drippers or orifices on small-diameter capillaries. The water can be evenly and slowly dripped into the soil near the roots of crops, creating favorable conditions for high and stable crop yields. Drip irrigation tapes are the most effective water-saving irrigation method in arid and water-scarce areas, with a water utilization rate of up to 95%. They have a higher water-saving and yield-increasing effect compared to sprinkler irrigation. At the same time, fertilization can be combined to more than double the fertilizer efficiency.

[0003] At present, commonly used drip irrigation tape cleaning agents abroad include citric acid, perchloric acid, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, etc. Although they can prevent and dissolve scale to a certain extent, they seriously affect the physical and chemical properties, aggregate structure and micro-ecological environment of the soil, and affect the normal growth of crops.

[0004] Algal polysaccharides represented by sodium alginate are natural water quality regulators. Algal polysaccharides, especially alginate in brown algae, are a class of natural macromolecular compounds rich in carboxyl groups. They can be used as thickeners, dispersants, emulsifiers, stabilizers, binders, film-forming agents, gelling agents and ion exchangers, and are widely used in all aspects of industrial and agricultural production. They can effectively improve the stress resistance of crops and their rapid recovery after damage, and promote photosynthesis and crop vitality. In agriculture, algal polysaccharides are also used as stabilizers and fungicides for pesticides, enabling the effective utilization of pesticide components without causing environmental pollution, and also having the effect of improving soil structure.

[0005] There are reports in the prior art on the application of sodium alginate to remove wastewater and heavy metals, such as "Preparation of Modified Sodium Alginate Gel Material and Its Chromium Removal Performance" (Zhang Yujia, Wang Xingrun, Wang Lei, etc. Journal of Environmental Engineering Technology, 2023, 13(6): 2135-2142.) and "Research Progress on the Treatment of Wastewater by Sodium Alginate and Its Derived Materials" (Sun Shuang, Zhou Xing, Wang Guoxiu, etc. Advances in Analytical Chemistry, 2021, 11(1): 16-27). However, when sodium alginate is directly applied as a cleaning agent in drip irrigation tapes, it is difficult to achieve good effects in removing dirt and deposits in the pipelines. This is because the common dirt and deposits in drip irrigation tape pipelines are organic residues and metal ions such as calcium and magnesium, and the cleaning effect of sodium alginate on them is limited.

[0006] Poly-γ-glutamic acid is a natural polymer formed by linking glutamic acid monomers through γ-amide bonds. It is a water-soluble and biodegradable polypeptide with good growth-promoting and stress-resistant activities for crops. At the same time, it can promote the absorption of nutrients by crop roots and improve fertilizer utilization efficiency. In addition, poly-γ-glutamic acid also has various activities such as adsorbing heavy metals, flocculating suspended solids, stabilizing pH, promoting the growth of beneficial microorganisms, reducing ammonia nitrogen and nitrite, and increasing dissolved oxygen.

[0007] Therefore, it is necessary to provide a regulator that can be used in drip irrigation tapes to adjust water quality and efficiently remove pipeline dirt and sediment, which is suitable for the scenario of large-scale drip irrigation tapes for planting. Summary of the Invention

[0008] To solve the above problems, a water quality regulator containing modified sodium alginate, its preparation method and application are provided. The water quality regulator provided in this application can be used for water quality adjustment and scale removal in large-scale drip irrigation tapes for planting. At the same time, it can enter the soil together with drip irrigation water, adjust alkaline soil, activate microbial flora, improve fertilizer utilization efficiency, and promote the growth of crops. At the same time, all components of this water quality regulator are natural and biodegradable, and will not cause pollution and damage to the soil environment, which conforms to the concept of green environmental protection in modern agriculture.

[0009] This application provides a preparation method of a water quality regulator containing modified sodium alginate, which is characterized in that the preparation method includes the following steps: 1) Prepare a solution of poly-γ-glutamic acid; 2) Dissolve alginaldehyde in the poly-γ-glutamic acid solution, adjust the pH to 2.0 - 6.0, and stir to dissolve the alginaldehyde; 3) Add sodium alginate, carrageenan, phosphoric acid / phosphate and citric acid / citrate, and then adjust the pH to 4.0 ± 0.5, and continue to stir for 10 - 50 minutes to obtain the water quality regulator.

[0010] Optionally, by weight, the water quality regulator includes: 20 - 40 parts of alginaldehyde, 10 - 20 parts of poly-γ-glutamic acid, 5 - 10 parts of sodium alginate, 5 - 10 parts of carrageenan, 1 - 2 parts of phosphoric acid / phosphate, and 1 - 2 parts of citric acid / citrate.

[0011] Optionally, the molecular weight of the alginaldehyde is 28 - 30 kDa; and / or, The molecular weight of the poly-γ-glutamic acid is 190 - 210 kDa.

[0012] Optionally, the oxidation degree of the alginaldehyde is 55 - 65%.

[0013] Optionally, the mass ratio of alginaldehyde to poly-γ-glutamic acid in the water quality regulator is (1.8~2.2):1.

[0014] Optionally, the pH of the water quality regulator is 4.0±0.5.

[0015] Optionally, the preparation method of the alginaldehyde includes the following steps: S1. Add sodium alginate into an organic solvent to prepare a suspension; S2. Add an oxidant and stir to react; S3. Add ethylene glycol to terminate the reaction; S4. Add absolute ethanol for alcohol precipitation; S5. Filter the obtained precipitate, which is alginaldehyde.

[0016] Optionally, in step 2), the oxidant is selected from one or more of hydrogen peroxide, perborate, permanganate, and periodate; Preferably, the oxidant is sodium periodate.

[0017] Preferably, the weight ratio of sodium periodate to sodium alginate is 1:3.8~4.5.

[0018] Preferably, in step 2), stir at 80±5°C for 60±10 min.

[0019] The present application provides the application of the water quality regulator prepared by the above preparation method of the water quality regulator containing modified sodium alginate in removing the scale in the drip irrigation pipeline of the drip irrigation belt.

[0020] Optionally, the application includes the following steps: A) Turn on the drip irrigation pump switch and the water valve, drip clean water, and the drip irrigation time is 0.5~1.0 hours; B) Add water into the fertilizer solution preparation tank, measure the water quality regulator according to the dosage standard of 2.5~3 L / mu of the water quality regulator, and dissolve the water quality regulator in water; C) Turn off the clean water drip irrigation mode, switch to the fertilizer solution drip irrigation system, and use the solution in the fertilizer solution preparation tank for pipeline scale removal and cleaning; D) After the cleaning is completed, let it stand for 0.5~1.0 hours, drip clean water to clean the pipeline, and then turn off the drip irrigation and the water pipe valve.

[0021] The water quality regulator provided by this application can be used alone as a drip irrigation pipeline for cleaning drip irrigation tapes. During use, the water quality regulator is diluted. It should be noted that the change in pH of the diluted water quality regulator does not affect its scale removal ability. The pH of the water quality regulator in this application is controlled within a certain range to avoid the decrease in its scale removal ability caused by the change in the oxidation degree of alginate aldehyde. By controlling the pH, the storage stability of the water quality regulator can be ensured.

[0022] Optionally, the application includes the following steps: a) Turn on the drip irrigation pump switch and the water valve, and drip clean water for 0.5 - 1.0 hours. b) In the fertilizer solution preparation tank / pool, add water matching the planting area, measure the water quality regulator according to the dosage standard of 2.5 - 3 L / mu, and add it to the fertilizer solution preparation tank / pool. c) Stir to dissolve the water quality regulator in water. d) Measure the water-soluble fertilizer according to the planting area and add it to the fertilizer solution preparation tank / pool, stir until completely dissolved and the solution is uniform. e) Turn off the clean water drip irrigation mode, switch to the fertilizer solution drip irrigation system, and use the solution in the fertilizer solution preparation tank / pool for fertilizer drip irrigation. f) After the drip irrigation ends, let it stand for 0.5 - 1.0 hours, drip clean water to clean the pipeline, and then turn off the drip irrigation and water pipe valves.

[0023] To improve the convenience of use and the scale removal effect on the pipeline, it is possible to add the water quality regulator to the fertilizer solution while performing fertilizer drip irrigation. This can avoid separately dripping the water quality regulator, improve the use efficiency, and save processes. In addition, when used together with the fertilizer solution, it can better reduce the formation of scale from calcium and magnesium and proteins in the fertilizer, and hinder and treat the scale from the source. It should be noted that the water quality regulator in this application can also be used alone to remove the scale that has already formed in the drip irrigation pipeline.

[0024] The beneficial effects of this application include but are not limited to: 1. According to the water quality regulator containing modified sodium alginate, its preparation method and application in this application, this regulator can be used for water quality regulation and scale removal in large-scale planting drip irrigation tapes. At the same time, it can enter the soil together with the drip irrigation water, regulate alkaline soil, activate the microbial flora, improve the fertilizer utilization rate, and promote the growth of crops.

[0025] 2. The water quality regulator containing modified sodium alginate according to the present application, its preparation method and application. Sodium alginate can be oxidized by oxidants such as periodic acid to convert some hydroxyl groups in the uronic acid units into aldehyde groups, greatly improving its cross-linking activity with calcium, magnesium ions and organic substances such as proteins. The prepared alginic aldehyde strengthens the cross-linking reaction and metal ion complexing ability, and can better adsorb organic residues and metal ions such as calcium and magnesium in the drip irrigation pipe, so as to better remove dirt and precipitates in the drip irrigation pipe.

[0026] 3. The water quality regulator containing modified sodium alginate according to the present application, its preparation method and application. The prepared alginic aldehyde not only retains the biological activity of sodium alginate, but also has better degradation performance. It can be self-degraded into small molecules in nature, which is environmentally friendly and more conducive to the absorption and utilization of crops, and can provide nutrients and stress resistance for crop growth.

[0027] 4. The water quality regulator containing modified sodium alginate according to the present application, its preparation method and application. The regulator components of this solution are all natural and degradable components, which will not cause pollution and damage to the soil environment, and conform to the concept of green environmental protection in modern agriculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings: Figure 1 It is a graph showing the influence results of the water quality regulator involved in Example 4 of the present application on the growth indexes of tomatoes; Figure 2 It is a graph showing the influence results of the water quality regulator involved in Example 4 of the present application on the fruit swelling of tomatoes; Figure 3 It is a graph showing the influence results of the water quality regulator involved in Example 4 of the present application on the color change effect of tomatoes; Figure 4 It is a graph showing the influence results of the water quality regulator involved in Example 4 of the present application on the quality of tomatoes. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present application will be described in detail below with reference to the embodiments. However, the present application is not limited to these embodiments. Unless otherwise specified, the raw materials and reagents in the embodiments of the present application are purchased through commercial channels.

[0030] The present application solution will be described below through specific examples.

[0031] Example 1 Weigh 200 g of sodium alginate, disperse it evenly by stirring in 500 mL of absolute ethanol, and add 500 mL of 10% sodium periodate aqueous solution. Stir and react at 80 °C for 1 h, then add 18.5 g of ethylene glycol to terminate the reaction. Add 5 L of 95% ethanol to the reaction solution to precipitate sodium alginate aldehyde. Filter by suction, wash and refine the precipitate with ethanol, dry it in an oven at 40 °C. After the obtained solid is redissolved in a small amount of water, it is passed through a dialysis membrane with a molecular weight cut-off of 1000 Da to remove small molecule impurities, and then dried to obtain modified sodium alginate, namely sodium alginate aldehyde.

[0032] Example 2 Take 10 g of sodium alginate aldehyde prepared in Example 1 and dissolve it in 100 mL of 5% poly-γ-glutamic acid solution. Adjust the pH to 5.0 with KOH and stir at room temperature for 15 min. Then, add 3.5 g of sodium alginate, 3 g of carrageenan, 0.8 g of potassium dihydrogen phosphate and 0.6 g of citric acid in sequence. Adjust the pH to 4.0 with KOH and continue to stir for 20 min to obtain a water quality regulator.

[0033] Example 3 A method for removing scale in drip irrigation pipelines of drip irrigation tapes, comprising the following steps: 1) Turn on the drip irrigation pump switch and water valve, and drip clean water for 0.5 - 1.0 hours. 2) In the fertilizer solution preparation tank / pool, add water matching the planting area, measure the water quality regulator according to the dosage standard of 2.5 - 3 L / mu, and add it into the fertilizer solution preparation tank / pool. 3) Stir with a stirrer or wooden stick to dissolve the water quality regulator evenly in water. 4) According to the planting area, measure an appropriate amount of products such as water-soluble fertilizers of macronutrients, add them into the fertilizer solution preparation tank / pool, and stir until completely dissolved and the solution is homogeneous. 5) Turn off the clean water drip irrigation mode, switch to the fertilizer solution drip irrigation system, and conduct fertilizer drip irrigation. 6) After the fertilizer solution drip irrigation is completed, let it stand for 0.5 - 1.0 hours, drip a small amount of clean water to clean the pipeline, and then turn off the drip irrigation and water pipe valves to complete the removal operation of scale in the drip irrigation pipelines of the drip irrigation tape.

[0034] In a specific embodiment, the water quality regulator is used at a dosage of 2.5 L / mu in the drip irrigation tape and used continuously for 3 times. The calcium content in the water of the drip irrigation tape before and after use is detected, as shown in Table 1 below.

[0035] Table 1 Removal effect of water quality regulator on calcium salts in drip irrigation tape

[0036] According to the results in Table 1, after continuously using the water quality regulator for 3 days, the calcium in the drip irrigation tape decreased by 82.56%.

[0037] Example 4 Test product: Water quality regulator (Example 2) Test crop: Tomato.

[0038] Test time: May - June 2024.

[0039] Test location: Pujizhen, Jiaozhou City, Qingdao.

[0040] Test treatments: As shown in Table 2 below.

[0041] Table 2 Specific settings of experimental treatments

[0042] During the fruit swelling period of tomatoes, root drip irrigation fertilization was carried out, with 6000 L of water used, dripping once every 8 days, for a total of 3 times. Before the start of the test, fruits of similar size were selected for marking. The test results and analysis are as follows: 1) Effects on tomato growth indicators Leaf color value and stem diameter are important indicators to measure the growth of plants. At the end of the test, the growth indicators were measured, and the test results are as Figure 1 shown.

[0043] As Figure 1 can be seen, the leaf color value of T1 is 2.12 higher than that of CK, and the stem diameter of T1 increases by 2.22 mm compared with CK. Therefore, after adding the water quality regulator, there is a good effect of green leaves and strong seedlings.

[0044] 2) Effects on tomato fruit swelling Fruit transverse diameter and single fruit weight are important indicators to measure fruit swelling. After 3 times of fertilization, the fruit transverse diameter and single fruit weight were measured, and the test results are as Figure 2 shown.

[0045] As Figure 2 can be seen, the results of tomato fruit transverse diameter and single fruit weight are consistent, and T1 is higher than CK in both cases. The fruit transverse diameter increases by 2.92 mm, and the single fruit weight increases by 19.86 g. Therefore, under the conditions of this test, the fruit swelling effect of T1 with the added water quality regulator is better than that of CK.

[0046] 3) Effects on tomato color change At the end of the test, the color change effects of each treatment were compared, and the test results are as Figure 3 shown.

[0047] As Figure 3It can be seen that there are 2 medium green fruits, 1 medium red and green fruit, and 3 light red fruits in CK, and 1 medium green fruit, 2 medium red and green fruits, and 2 light red fruits in T1. The color conversion promotion effect of T1 is slightly better than that of CK. Therefore, the phenomenon that the fruit ripening is delayed due to the promotion of fruit swelling does not occur in this water quality regulator.

[0048] 4) Influence on tomato quality Brix and hardness are important indicators to measure the quality of tomato fruits. At the end of the experiment, fruits with consistent maturity were selected for the determination of brix and hardness. The experimental results are as Figure 4 shown.

[0049] It can be Figure 4 seen that T1 has a better sweetening effect, and the brix increases by 1.4% compared with CK, and the growth rate is 28.69% higher than that of high nitrogen; the hardness of tomatoes in T1 is higher, increasing by 0.15×10 5 Pa compared with CK; therefore, the overall quality improvement effect of T1 is better than that of CK.

[0050] To sum up, it can be seen that during the fruit swelling period of tomatoes, when adding a water quality regulator during drip irrigation of fertilizers at the roots, it can effectively improve the leaf color value of tomatoes, increase the stem diameter of plants, and promote fruit swelling, color conversion, and sweetening, with very good effects of greening seedlings and increasing production and improving quality.

[0051] Experimental Example 1 Before determining the final regulator scheme, the experimental personnel conducted a comparative experiment on the selection of prepared alginic acid aldehyde and poly-γ-glutamic acid, and found that the oxidation degree, molecular weight of alginic acid aldehyde, and molecular weight of poly-γ-glutamic acid would all affect the scale removal effect of the regulator. In particular, different oxidation degrees of alginic acid aldehyde showed obvious differences in the scale removal effect of the regulator.

[0052] The water quality in the drip irrigation belt was simulated in the laboratory. 1L of 2.05g / L calcium nitrate solution, 1L of 0.4g / L magnesium nitrate solution, and 2L of 0.8g / L diammonium phosphate solution were added to the experimental container in sequence; the water quality regulator was diluted 2000 times and then added to the experimental container, stirred for 30 minutes, and used continuously for 3 times. Atomic spectrophotometry was used to detect the calcium ion content and magnesium ion content in the water, and a pH meter was used to detect the pH value. The results are shown in Table 1 below, and the differences in the components of the tested regulator samples are shown in Table 3.

[0053] Table 3 Comparative experiment settings and scale removal effect test results

[0054] According to the results in the above table, when alginic acid aldehyde with an oxidation degree of about 60% and a molecular weight of about 28.8 kDa is combined with poly-γ-glutamic acid with a molecular weight of about 200,000, the regulator product shows the best scale removal effect. In particular, the oxidation degree of alginic acid aldehyde has a more obvious influence on scale removal.

[0055] Experimental Example 2 The design idea of ​​the regulator in this scheme is to remove scale through alginate aldehyde, and by adding additives that are beneficial to plant growth and water quality regulation to the regulator, the dual effects of removing scale and regulating water quality are achieved. In the specific scheme of this application, the experimenters mainly used macromolecular polymers synthesized by biological fermentation, specifically amino acid polymers, for the selection of water quality regulators. Amino acid polymers can regulate water quality and promote plant growth, bringing biological activities such as resistance to stress.

[0056] In the process of exploring the regulator scheme, the experimenters found in the early screening experiments that different amino acid polymers as additives also showed differences in the removal of scale when combined with alginate aldehyde, especially when poly-γ-glutamic acid was used in combination with alginate aldehyde. It not only had a better descaling effect than using alginate aldehyde alone, but also had a better descaling effect than other additives. It can be seen that poly-γ-glutamic acid and alginate aldehyde showed a more obvious synergistic effect in removing scale. The test conditions and results are shown in Table 4.

[0057] Table 4 Descaling effect of different polymers combined with alginate aldehyde

[0058] According to the results in Table 4, poly-γ-glutamic acid and alginate aldehyde showed a more obvious synergistic effect in removing scale. It is speculated that poly-γ-glutamic acid can better assist in improving the cross-linking effect of alginate aldehyde with organic matter such as calcium, magnesium ions and proteins, thereby assisting in the removal of dirt and sediment in the drip irrigation pipe.

[0059] Experimental Example 3 The experimenters have previously discovered that the oxidation degree of alginate aldehyde has a great influence on the descaling effect of the regulator, and the oxidation degree of alginate aldehyde mainly depends on its preparation method. Therefore, the experimenters have repeatedly explored and obtained the preparation method of the oxidation product required for the preparation of stable alginate aldehyde. The process conditions and oxidation degree results are shown in Table 5.

[0060] The method for detecting the degree of oxidation is as follows: the prepared crude alginate aldehyde is dissolved in distilled water, hydroxylamine hydrochloride solution is added to react for 3 hours, and NaOH is used as a titrant to titrate the released equivalent HCl by potentiometric titration to calculate the aldehyde group concentration (mol / g) in the alginate aldehyde, and then calculate the degree of oxidation.

[0061] Table 5 Experimental results of alginate aldehyde oxidation degree control process

[0062] During the use of the regulator product, field operators found that the longer the regulator was placed, the worse its scale removal effect became. Through research, it was found that there were problems of self-degradation and excessive oxidation of alginic aldehyde in the regulator product, both of which would lead to a deterioration of the scale removal effect of the regulator with the increase of the placement time.

[0063] Through research and experiments, it was speculated that this problem might occur due to the too low pH of the regulator product. Therefore, the experimental personnel explored the suitable pH conditions for the regulator, and explored the stability and scale removal effect of the regulator product. The scale removal effects of products with different pH values after being placed for 3 days, 14 days, and 30 days were respectively tested. The pH conditions and test results are shown in Table 6 below.

[0064] Table 6 pH of the regulator, stability and scale removal effect of the regulator product

[0065] According to the results in Table 6, it can be seen that at the end of the preparation of the regulator, adding KOH or NaOH to adjust the pH to about 4.0 can ensure that the regulator has good stability, and can still maintain a good scale removal effect after being placed for 30 days, and can solve the problem of the deterioration of the scale removal effect caused by the self-degradation and excessive oxidation of alginic aldehyde.

[0066] As mentioned above, it is only the embodiment of the present application. The protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the technical idea and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for preparing a water quality regulator containing modified sodium alginate, characterized in that: The preparation method comprises the following steps: 1) preparing poly-γ-glutamic acid into a solution; 2) Dissolve alginate aldehyde in poly-γ-glutamic acid solution, adjust the pH to 2.0-6.0, and stir to dissolve the alginate aldehyde; 3) adding sodium alginate, carrageenan, phosphoric acid / phosphate and citric acid / citrate, adjusting the pH to 4.0±0.5, and continuing stirring for 10-50 minutes to obtain the water quality regulator.

2. The method for preparing a water quality conditioner containing modified sodium alginate according to claim 1, characterized in that: The water quality regulator comprises, by weight, 20 to 40 parts of alginate aldehyde, 10 to 20 parts of poly-γ-glutamic acid, 5 to 10 parts of sodium alginate, 5 to 10 parts of carrageenan, 1 to 2 parts of phosphoric acid / phosphate and 1 to 2 parts of citric acid / citrate.

3. The method for preparing a water quality regulator containing modified sodium alginate according to claim 2, characterized in that: The molecular weight of the alginate aldehyde is 28-30 kDa; and / or, The molecular weight of the poly-γ-glutamic acid is 190-210 kDa.

4. The method for preparing a water quality regulator containing modified sodium alginate according to claim 2, characterized in that: The oxidation degree of the alginate aldehyde is 55-65%.

5. The method for preparing a water quality regulator containing modified sodium alginate according to claim 2, characterized in that: The mass ratio of alginate aldehyde to poly-γ-glutamic acid in the water quality regulator is (1.8-2.2):

1.

6. The method for preparing a water quality conditioner containing modified sodium alginate according to claim 1, characterized in that: The preparation method of alginate aldehyde comprises the following steps: S1, adding sodium alginate into an organic solvent to prepare a suspension; S2, adding an oxidant and stirring the reaction; S3, adding ethylene glycol to terminate the reaction; S4, adding anhydrous ethanol for alcohol precipitation; S5. The precipitate obtained by filtering is alginate aldehyde.

7. The method for preparing a water quality conditioner containing modified sodium alginate according to claim 6, characterized in that: In step S2, the oxidant is selected from one or more of hydrogen peroxide, perborate, permanganate, and periodate; Preferably, the oxidant is sodium periodate; Preferably, the weight ratio of sodium periodate to sodium alginate is 1:3.8-4.5; Preferably, in step S2, stirring is performed at 80±5° C. for 60±10 min.

8. Use of the water quality conditioner prepared by the method for preparing a water quality conditioner containing modified sodium alginate according to any one of claims 1 to 7 in removing scale from drip irrigation pipes in drip irrigation belts.

9. The use according to claim 8, characterized in that: The application comprises the following steps: A) Turn on the drip irrigation pump switch and water valve, and drip irrigation with clean water for 0.5~1.0 hours; B) Add water to the fertilizer solution preparation tank / tank, take the water quality regulator according to the standard dosage of 2.5~3L / mu, and dissolve the water quality regulator in the water; C) Turn off the clean water drip irrigation mode, switch to the fertilizer solution drip irrigation system, and use the solution in the fertilizer solution preparation pool / tank to descale and clean the pipes; D) After cleaning, let it stand for 0.5~1.0 hour, clean the pipes with drip irrigation water, and then close the drip irrigation and water pipe valves.

10. The use according to claim 8, characterized in that: The application comprises the following steps: a) Turn on the drip irrigation pump switch and water valve, and drip irrigation with clean water for 0.5~1.0 hours; b) Add water that matches the planting area to the fertilizer solution preparation tank / tank, take the water quality regulator according to the standard dosage of 2.5~3L / mu, and add it to the fertilizer solution preparation tank / tank; c) stirring to dissolve the water quality regulator in water; d) Take water-soluble fertilizer according to the planting area and add it to the fertilizer solution preparation pool / tank, stir until it is completely dissolved and the solution is uniform; e) Turn off the clean water drip irrigation mode, switch to the fertilizer solution drip irrigation system, and use the solution in the fertilizer solution preparation pool / tank for fertilizer drip irrigation; f) After the drip irrigation is completed, let it stand for 0.5~1.0 hour, clean the pipes with drip irrigation water, and then close the drip irrigation and water pipe valves.

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