Preparation method for quickly dissolving polyacrylamide at low concentration
By adopting low-concentration polyacrylamide dry powder solution, the dissolution difficulties and water quality instability caused by high-concentration configuration are solved, the stable operation of the water purification system and the efficient use of dry powder are achieved, and the operating cost and labor volume are significantly reduced.
Patent Information
- Application Number
- CN202411638038.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-16
- Publication Date
- 2025-02-25
AI Technical Summary
In the prior art, the high concentration configuration of polyacrylamide leads to difficulty in dissolution, which easily blocks the water sprayer, and is not effective when treating high turbidity water, resulting in unstable water quality of the sedimentation tank, large waste of dry powder, and large labor.
Use a low-concentration polyacrylamide dry powder solution to determine the appropriate concentration through the test stage. Add the dry powder solution using a burette, stir and stand and observe the settlement ratio to ensure that the water layer is transparent and the particles are uniform, and avoid wrapping large sludge residue.
It realizes rapid dissolution of low concentration of polyacrylamide, and stable operation of the water purification system, reduces the turbidity of the water outlet of the precipitation tank, avoids the clogging of the medicine particles, extends the preparation interval, reduces the labor of employees, and significantly saves the use of dry powder and reduces the operating costs.
Abstract
Description
Technical Field
[0001] The invention relates to a preparation method for rapidly dissolving polyacrylamide at low concentration. Background Art
[0002] Since the normal operation of the Jingyuan Company Water Plant, the Yellow River raw water relies on two radial flow radial sedimentation tanks (hereinafter referred to as radial sedimentation tanks) in the purification station yard, each of which is equipped with a scraper truss as the sludge discharge equipment of the radial sedimentation tank. In the radial sedimentation tank process, the polyacrylamide solution is transported to the water inlet pipe through the water ejector and enters the pool, and flows radially from the center to the surroundings to perform adsorption bridging reaction. The horizontal flow rate gradually decreases from the center to the periphery, and the mud and sand in the water slowly sink, while the clean water slowly rises, and finally flows from the triangular weirs distributed around into the annular water collection tank, and then flows into the acceleration tank through the outlet pipe. The mud and sand that sink to the bottom of the pool are scraped to the center of the pool bottom by the slowly rotating scraper truss and discharged in a centralized manner. In this process, polyacrylamide (dry powder) hereinafter referred to as dry powder plays a pivotal role. There is no precedent for the construction of water treatment in the power plant purification station. From the beginning, this radial flow sedimentation tank treatment mode was adopted in accordance with the conventional mode of the water treatment industry, and polyacrylamide anion was selected to treat the raw water. The dry powder has always been configured at a concentration of 1%, which means that 20 kg of dry powder requires 2000 kg of water. The 1% configuration concentration is high, the viscosity is high and difficult to dissolve, and the water injector is often blocked by large particles and cannot be added. It is required to add a small amount when the turbidity of the raw water is above 100°, the raw water has a small amount of sand content, and the addition concentration is controlled at 0.2%. It is difficult to form an adsorption bridging mechanism. When the temperature is above 3000°, the dry powder solution is easily wrapped by mud residue, and the mixed liquid surface is raised, which is not conducive to the coagulation reaction.
[0003] Whether it is 500° raw water or 30000° raw water, the concentration is the same. The only thing that can be controlled is the dosing concentration. For raw water below 1000°, it is difficult for the dry powder solution to effectively play the role of treating high turbidity water, which affects the water quality of the sedimentation tank and causes a large waste of dry powder. The calculation error of the sedimentation tank sludge is large. Two stirring tanks are installed on the preparation platform of the dry powder solution to prepare the dry powder solution. In the dosing system, the water ejector is used to add #3 (commonly known as) medicine to the source water of the radiation sedimentation tank to meet the needs of water quality treatment.
[0004] When the turbidity of the Yellow River is below 50 degrees, the radial sedimentation tank will exceed the operation. This situation only occurs for 60-70 days a year. When the turbidity of the Yellow River is above 50 degrees, the radial sedimentation tank will be put into operation. When the turbidity of the Yellow River is above 100 degrees, the radial sedimentation tank should be added with chemicals during operation. When the turbidity of the Yellow River is above 50,000 degrees, the radial sedimentation tank should be stopped. This happens very rarely in a year. Therefore, using a 1% configuration concentration to treat raw water is extremely wasteful, and manual configuration is frequent and labor-intensive. Summary of the invention
[0005] The purpose of the present invention is to solve the above-mentioned problems, thereby providing a method for quickly dissolving polyacrylamide at a low concentration.
[0006] The above purpose is achieved through the following technical solutions: A method for quickly dissolving polyacrylamide at a low concentration, the method comprising the following steps: (1) Experimental stage; (2) At the same stage, the raw water of the Yellow River below 1000° with the same sediment was taken, and the same amount of dry powder solution of different concentrations was added with a burette. The mixture was stirred for the same time, and then left to stand for the same time to observe the sedimentation ratio. The results showed that after the low-concentration dry powder solution was used, the raw water could quickly form a clear mixed liquid surface, the clear water layer was transparent, and the flower particles were uniform, without obvious large particles of mud being wrapped. (3) For the raw water of the Yellow River at about 5000°, equal amounts of dry powder solutions of different concentrations were added with a burette, stirred for the same time, and placed for the same time to observe the sedimentation ratio. The results showed that after using the low-concentration dry powder solution, the raw water could quickly form an obvious mixed liquid surface, the clear water layer was transparent, and the particles were uniform, without obvious large particles of mud. However, the mixed liquid surface in the measuring cylinder of the raw water of the Yellow River with the addition of high-concentration dry powder solution was not very obvious, and the particles in the clear water layer were uneven.
[0007] (4) Raw water sampling requires that water flow in the sampling tube for 2-3 minutes before the water sample can be taken.
[0008] The method for preparing a method for rapidly dissolving polyacrylamide at a low concentration, the specific process of step (4) is as follows: the water sample to be used should be taken from each of the #1 and #2 sampling tubes and mixed evenly, the taken water sample should be shaken evenly and poured into a measuring cylinder to make the water sample height consistent, and then placed on a horizontal table to allow the mud in the water sample to sink for comparison. When sampling, the valves of the #1 and #2 sampling tubes in the inlet gate chamber should be fully opened to check whether the water flow in the sampling tube is smooth and there is no blockage.
[0009] The method for preparing polyacrylamide for rapid dissolution at low concentration, the test tools in step (1) include: a stirring beaker, a dry powder measuring vessel, a raw water measuring cylinder, and a burette. Beneficial Effects
[0010] 1. Since the use of the present invention, the water purification system has been running stably, and the turbidity of the effluent from the sedimentation tank has decreased significantly compared with 2022, with an average effluent turbidity of about 23°. The dosing system is unobstructed, and there is no situation where the drug particles block the dosing system. The preparation interval is extended, and the workload of employees is reduced.
[0011] 2. Since the use of the present invention, according to this water volume, as of July 2024, if the original configuration concentration is used, the effective dry powder addition within three years is 5% of the raw water volume. The raw water of 20 million tons a year minus the 3 million tons of raw water in winter in January and February each year uses 1.7 million tons of this aqueous solution, and the dry powder content requires 8.5 tons. After the new method is used and configured at a concentration of 0.2%, only 1.5 tons of dry powder is consumed in three years, saving 7 tons of dry powder. The unit price of dry powder is 22,000 yuan / ton, saving the cost of dry powder by 154,000 yuan, and the energy-saving effect is significant. DETAILED DESCRIPTION
[0012] A method for quickly dissolving polyacrylamide at a low concentration, the method comprising the following steps: (1) Experimental stage; (2) At the same stage, the raw water of the Yellow River below 1000° with the same sediment was taken, and the same amount of dry powder solution of different concentrations was added with a burette. The mixture was stirred for the same time, and then left to stand for the same time to observe the sedimentation ratio. The results showed that after the low-concentration dry powder solution was used, the raw water could quickly form a clear mixed liquid surface, the clear water layer was transparent, and the flower particles were uniform, without obvious large particles of mud being wrapped. (3) For the raw water of the Yellow River at about 5000°, equal amounts of dry powder solutions of different concentrations were added with a burette, stirred for the same time, and placed for the same time to observe the sedimentation ratio. The results showed that after using the low-concentration dry powder solution, the raw water could quickly form an obvious mixed liquid surface, the clear water layer was transparent, and the particles were uniform, without obvious large particles of mud. However, the mixed liquid surface in the measuring cylinder of the raw water of the Yellow River with the addition of high-concentration dry powder solution was not very obvious, and the particles in the clear water layer were uneven.
[0013] (4) Raw water sampling requires that water flow in the sampling tube for 2-3 minutes before the water sample can be taken.
[0014] The specific process of step (4) is as follows: the water sample to be used should be taken from each of the #1 and #2 sampling tubes and mixed evenly. The water sample taken should be shaken evenly and poured into a measuring cylinder to make the water sample height consistent. Then, it should be placed on a horizontal table to allow the mud in the water sample to sink for comparison. When sampling, the valves of the #1 and #2 sampling tubes in the inlet gate chamber should be fully opened to check whether the water flow in the sampling tube is smooth and there is no blockage.
[0015] The test tools in step (1) include: a stirring beaker, a dry powder measuring vessel, a raw water measuring cylinder, and a burette.
Claims
1. A method for quickly dissolving polyacrylamide at low concentration, characterized by: The method comprises the following steps: (1) Experimental stage; (2) At the same stage, the raw water of the Yellow River below 1000° with the same sediment was taken, and the same amount of dry powder solution of different concentrations was added with a burette. The mixture was stirred for the same time, and then left to stand for the same time to observe the sedimentation ratio. The results showed that after the low-concentration dry powder solution was used, the raw water could quickly form a clear mixed liquid surface, the clear water layer was transparent, and the flower particles were uniform, without obvious large particles of mud being wrapped. (3) For the raw water of the Yellow River at about 5000°, equal amounts of dry powder solutions of different concentrations were added with a burette, stirred for the same time, and placed for the same time to observe the sedimentation ratio. The results showed that after using the low-concentration dry powder solution, the raw water could quickly form an obvious mixed liquid surface, the clear water layer was transparent, and the particles were uniform, without obvious large particles of mud. However, the mixed liquid surface in the measuring cylinder of the raw water of the Yellow River with the addition of high-concentration dry powder solution was not very obvious, and the particles in the clear water layer were uneven.
2. (4) Raw water sampling requires that water flow in the sampling tube for 2-3 minutes before the water sample can be taken.
3. A method for rapidly dissolving polyacrylamide at low concentration according to claim 1, characterized in that: The specific process of step (4) is as follows: the water sample to be taken should be taken from each of the 1st and 2nd sampling tubes and mixed evenly. The water sample taken should be shaken evenly and poured into the measuring cylinder to make the water sample height consistent. Then, it should be placed on a horizontal table to allow the mud in the water sample to sink for comparison. When sampling, the inlet gate chamber should be fully opened. # 1.2 Sampling tube valve, check whether the water in the sampling tube flows smoothly without blockage.
4. A method for rapidly dissolving polyacrylamide at low concentration according to claim 2, characterized in that: The test tools in step (1) include: a stirring beaker, a dry powder measuring vessel, a raw water measuring cylinder, and a burette.