Cationic polyacrylamide sludge treatment agent detection method

Abstract

The invention discloses a method for detecting a cationic polyacrylamide sludge treatment agent. The method comprises the step of detecting the cationic degree, the relative molecular mass, the solid content, the dissolution time, the viscosity and the ash content of the cationic polyacrylamide sludge treatment agent. The method can effectively detect various indexes of the cationic polyacrylamide sludge treatment agent, has the advantages of being short in time consumption, low in cost, high in result accuracy, high in repeatability, high in precision and the like, and can meet the requirement of rapid batch detection.

Description

Technical Field

[0001] The invention belongs to the field of chemical detection, and in particular relates to a method for detecting a cationic polyacrylamide sludge treatment agent. Background Art

[0002] With the development of industry and the increase of urban sewage discharge, sludge treatment has become an important part of environmental protection. Cationic polyacrylamide sludge treatment agent has good flocculation effect, which can make the solid particles in the sludge gather and precipitate quickly, and is widely used in sludge treatment. During the treatment process, it is necessary to test the cationic polyacrylamide sludge treatment agent to evaluate its treatment effect.

[0003] At present, the traditional detection method of cationic polyacrylamide sludge treatment agent is mainly titration method, such as using chemical titration to determine the cationic degree in cationic polyacrylamide sludge treatment agent, but this method has low detection efficiency and requires a lot of time for titration and calculation of results. The whole process is time-consuming and cannot meet the needs of rapid detection. In addition, during the detection process, it is easy to produce errors due to factors such as sample pretreatment and operating environment, which will lead to low accuracy of the test results. Summary of the invention

[0004] The purpose of the present invention is to provide a rapid, accurate, low-cost, high-precision and high-repeatability method for detecting a cationic polyacrylamide sludge treatment agent in view of the above technical problems to be solved.

[0005] In order to achieve the above invention objectives, the present invention provides a method for detecting a cationic polyacrylamide sludge treatment agent, which comprises detecting the cationic degree, relative molecular mass, solid content, dissolution time, viscosity and ash content of the cationic polyacrylamide sludge treatment agent.

[0006] According to the method of the present invention, preferably, the steps of detecting the cationic degree are as follows:

[0007] (1) Add 0.3000 g of cationic polyacrylamide sludge treatment agent into 500 mL of water and stir to dissolve to obtain test solution A;

[0008] (2) Add 10 mL of test solution A to 900 mL of water, stir evenly, and adjust the pH to 3-4 to obtain test solution B;

[0009] (3) Using a charge analyzer to detect the test solution B, the cationic degree of the cationic polyacrylamide sludge treatment agent is obtained.

[0010] According to the method of the present invention, preferably, the steps of detecting the relative molecular mass are as follows:

[0011] (1) Add 0.0300 g of cationic polyacrylamide sludge treatment agent to 60 mL of water, stir until dissolved, and dilute to 100 mL to obtain test solution A;

[0012] (2) Pour the test solution A into the Ubbelohde viscometer, record the time it takes for the test solution A to pass through the spherical part, and calculate to obtain the relative molecular mass of the cationic polyacrylamide sludge treatment agent.

[0013] According to the method of the present invention, preferably, the steps of detecting the solid content are as follows:

[0014] 1 g of cationic polyacrylamide sludge treating agent was dried at 120° C. for 2 hours, taken out, cooled to room temperature, weighed, and the solid content of the cationic polyacrylamide sludge treating agent was calculated.

[0015] According to the method of the present invention, preferably, the step of detecting the dissolution time is as follows:

[0016] 0.1000 g of cationic polyacrylamide sludge treating agent was added into 100 mL of water, and the dissolution time of the cationic polyacrylamide sludge treating agent was obtained by detecting with a conductivity meter electrode.

[0017] According to the method of the present invention, preferably, the steps of detecting viscosity are as follows:

[0018] 2 g of cationic polyacrylamide sludge treating agent was added into 200 mL of water, stirred until completely dissolved, and then tested using a digital viscometer to obtain the viscosity of the cationic polyacrylamide sludge treating agent.

[0019] According to the method of the present invention, preferably, the steps of detecting ash content are as follows:

[0020] Use a crucible that has been pre-dried to constant weight to weigh about 2g of the sample, place it in a muffle furnace, and burn it at about 500℃ for 4 hours. After taking it out, place it in a drying dish and cool it to room temperature, then weigh it again to calculate the ash content of the cationic polyacrylamide sludge treatment agent.

[0021] This method can effectively and specifically detect various indicators of cationic polyacrylamide sludge treatment agent, detect cationicity through high-precision equipment, reduce labor costs, time costs, and greatly improve accuracy. In addition, compared with traditional methods, the cationic polyacrylamide sludge treatment agent used in this method requires less, which can save costs and reduce waste. This method can also effectively know whether the cationic polyacrylamide sludge treatment agent contains other impurities, and the proportion of impurities contained can be known through this detection method. This method has the advantages of short time (all project indicators can be detected in 3 hours), low cost, high result accuracy, high repeatability, high precision, etc., and can meet the needs of rapid batch detection. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with specific examples. It should be understood that the following examples are only used to illustrate the present invention, rather than to limit the scope of the present invention.

[0023] The cationic polyacrylamide sludge treatment agent detection method provided by the present invention is described in detail below, but the protection scope of the present invention is not limited thereto.

[0024] Follow the steps below to test the various properties of the cationic polyacrylamide sludge treatment agent, including cationic degree, relative molecular mass, solid content, dissolution time, viscosity, and ash content;

[0025] 1. Detect the cationic degree of cationic polyacrylamide sludge treatment agent

[0026] (1) Sample pretreatment

[0027] 500 mL of water was measured and placed in a 1 L beaker, placed on a magnetic stirrer, and the speed was adjusted to 250-350 r / min. 0.3000 g of cationic polyacrylamide sludge treatment agent (product model ST2844, for example only, but not limited thereto) was weighed and added to the beaker, stirred and dissolved to obtain test solution A.

[0028] (2) Test solution A treatment

[0029] Weigh 900 mL of water into a 1 L beaker, place the beaker on a magnetic stirrer, transfer 10 mL of test solution A into the beaker, adjust the pH to 3-4, and obtain test solution B.

[0030] (3) Charge analysis of test solution B

[0031] Place test solution B in the charge analyzer, start the motor, and start titration after the initial charge value tends to stabilize. Turn on the automatic titration mode, automatically record the volume of titration solution consumed when the streaming potential drops to 0mv, and calculate the cationic degree of the cationic polyacrylamide sludge treatment agent.

[0032] 2. Detection of relative molecular mass of cationic polyacrylamide sludge treatment agent

[0033] (1) Sample pretreatment

[0034] Weigh 0.0300 g of cationic polyacrylamide sludge treatment agent into a 100 mL beaker, pour in 60 mL of water, stir until dissolved, and dilute to a 100 mL volumetric flask to obtain test solution A.

[0035] (2) Detection of test solution A

[0036] Pour the test solution A into the Ubbelohde viscometer, record the time it takes for the test solution A to pass through the spherical part, and calculate to obtain the relative molecular mass of the cationic polyacrylamide sludge treatment agent.

[0037] 3. Detection of solid content of cationic polyacrylamide sludge treatment agent

[0038] Use a weighing bottle that has been dried to constant weight at 120°C in advance to weigh 1g of the cationic polyacrylamide sludge treatment agent sample, place it in an electric blast drying oven, bake it at 120°C for 2 hours, take it out and place it in a drying dish to cool to room temperature, weigh it, and calculate the solid content of the cationic polyacrylamide sludge treatment agent.

[0039] 4. Detect the dissolution time of cationic polyacrylamide sludge treatment agent

[0040] Place a beaker containing 100 mL of water and a stirrer into an electric thermostatic stirrer, adjust the appropriate speed to 250-350 r / min, insert the conductivity meter electrode into the beaker, weigh 0.1000 g of cationic polyacrylamide sludge treatment agent into the beaker, wait for the conductivity value of the recorder to stabilize, record the time, and obtain the dissolution time of the cationic polyacrylamide sludge treatment agent.

[0041] 5. Detection of viscosity of cationic polyacrylamide sludge treatment agent

[0042] Place a beaker containing 200mL of water on a magnetic stirrer, adjust the appropriate speed to 450-600r / min, weigh 2g of cationic polyacrylamide sludge treatment agent into the beaker, stir until completely dissolved, pour into a 200mL beaker, place it on a digital viscometer for detection, and obtain the viscosity of the cationic polyacrylamide sludge treatment agent.

[0043] 6. Detection of ash content of cationic polyacrylamide sludge treatment agent

[0044] Use a crucible that has been pre-dried to constant weight to weigh about 2g of the sample, place it in a muffle furnace, and burn it at about 500℃ for 4 hours. After taking it out, place it in a drying dish and cool it to room temperature, then weigh it again to calculate the ash content of the cationic polyacrylamide sludge treatment agent.

[0045] Taking the commercially available cationic polyacrylamide sludge treatment agent product as an example, the test results are as follows:

[0046] The above detection method was used to detect the cationic degree of cationic polyacrylamide sludge treatment agent. A 30% molar ratio of cationic polyacrylamide sludge treatment agent was used. Ten groups of samples were tested using a charge analyzer. The test results were: 29.8, 29.7, 30.0, 30.1, 29.9, 29.8, 30.0, 29.9, 30.1, 29.8. The standard deviation of the ten groups of results was 0.13%, the relative standard deviation reached 0.45%, and the relative average deviation was 0.37%. It can be seen that the use of a charge analyzer to detect cationic degree has high accuracy and good repeatability.

[0047] The ten sets of data of relative molecular mass detected by this detection method are all in the range of 6.1-6.3 million, the values ​​are stable and the detection process is fast.

[0048] The solid content of the exemplary commercially available cationic polyacrylamide sludge treatment agent detected by this scheme is 90.8%, the dissolution time is 27min, the viscosity is 6471mPa·S, and the ash content is ≤0.1%, all of which meet the indicators of the cationic polyacrylamide sludge treatment agent tested. This method has the advantages of short time and high accuracy.

Claims

1. A method for detecting a cationic polyacrylamide sludge treatment agent, characterized in that The method comprises detecting the cationic degree, relative molecular mass, solid content, dissolution time, viscosity and ash content of the cationic polyacrylamide sludge treating agent.

2. The method according to claim 1, characterized in that: The steps for detecting cationicity are as follows: (1) Add 0.3000 g of cationic polyacrylamide sludge treatment agent into 500 mL of water and stir to dissolve to obtain test solution A; (2) Add 10 mL of test solution A to 900 mL of water, stir evenly, and adjust the pH to 3-4 to obtain test solution B; (3) Using a charge analyzer to detect the test solution B, the cationic degree of the cationic polyacrylamide sludge treatment agent is obtained.

3. The method according to claim 1, characterized in that The steps for detecting relative molecular mass are as follows: (1) Add 0.0300 g of cationic polyacrylamide sludge treatment agent to 60 mL of water, stir until dissolved, and dilute to 100 mL to obtain test solution A; (2) Pour the test solution A into the Ubbelohde viscometer, record the time it takes for the test solution A to pass through the spherical part, and calculate to obtain the relative molecular mass of the cationic polyacrylamide sludge treatment agent.

4. The method according to claim 1, characterized in that: The steps for testing solid content are as follows: 1 g of cationic polyacrylamide sludge treating agent was dried at 120° C. for 2 hours, taken out, cooled to room temperature, weighed, and the solid content of the cationic polyacrylamide sludge treating agent was calculated.

5. The method according to claim 1, characterized in that: The steps for detecting the dissolution time are as follows: 0.1000 g of cationic polyacrylamide sludge treating agent was added into 100 mL of water, and the dissolution time of the cationic polyacrylamide sludge treating agent was obtained by detecting with a conductivity meter electrode.

6. The method according to claim 1, characterized in that The steps for testing viscosity are as follows: 2 g of cationic polyacrylamide sludge treating agent was added into 200 mL of water, stirred until completely dissolved, and then tested using a digital viscometer to obtain the viscosity of the cationic polyacrylamide sludge treating agent.

7. The method according to claim 1, characterized in that The steps for testing ash content are as follows: Use a crucible that has been pre-dried to constant weight to weigh about 2g of the sample, place it in a muffle furnace, and burn it at about 500℃ for 4 hours. After taking it out, place it in a drying dish and cool it to room temperature, then weigh it again to calculate the ash content of the cationic polyacrylamide sludge treatment agent.