Activated sludge rapid detection method

Abstract

The invention discloses a method for rapidly detecting activated sludge. The method comprises the following steps: detecting the charge and granularity of the activated sludge before treatment; treating the activated sludge by using a polyacrylamide sludge treatment agent; and detecting the charge, granularity, dynamic water filtration and CST capillary water absorption characteristics of the treated activated sludge. According to the method, the granularity and the charges in the activated sludge can be quickly distinguished, and which polyacrylamide sludge treatment agent has the best treatment effect on the activated sludge can be quickly determined. Compared with the prior art, the method is more systematic and more accurate, and is beneficial to remarkably improving the sewage treatment efficiency.

Description

Technical Field

[0001] The invention belongs to the field of chemical detection, and in particular relates to a rapid detection method for activated sludge. Background Art

[0002] With the acceleration of urbanization and the vigorous development of industry, a large amount of sludge will be generated in the sewage treatment process. For example, a medium-sized urban sewage treatment plant may produce tens of tons or even hundreds of tons of sludge every day. These sludges contain a lot of water. Generally speaking, the moisture content of primary sludge is about 95%-97%, and the moisture content of residual activated sludge is as high as 99% or more. The large volume of sludge with high moisture content not only takes up a lot of storage space, but also increases the difficulty and cost of subsequent treatment. Therefore, the detection of activated sludge has become one of the key links in sludge treatment and disposal. Testing the physical and chemical properties of activated sludge can comprehensively evaluate the treatment effect.

[0003] The main purpose of testing activated sludge is to select a more suitable polyacrylamide sludge treatment agent, so as to reduce its moisture content and avoid secondary pollution to the soil, water and atmospheric environment. At present, there is still a lack of a more accurate method for testing activated sludge. Commonly used polyacrylamide sludge treatment agents are generally used for treatment, with varying results, resulting in the treatment of activated sludge failing to meet discharge requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a method for quickly detecting the particle size, charge and other properties of activated sludge so as to determine which type of polyacrylamide sludge treatment agent is suitable for the above technical problems.

[0005] In order to achieve the above object of the invention, the present invention provides a method for rapid detection of activated sludge, which comprises the following steps:

[0006] (1) Detect the charge and particle size of activated sludge before treatment;

[0007] (2) Treating activated sludge with polyacrylamide sludge treatment agent;

[0008] (3) Detect the charge, particle size, dynamic water filtration, and CST capillary water absorption characteristics of the treated activated sludge.

[0009] According to the method of the present invention, preferably, in the step (1), the potential in the activated sludge is detected by a zeta potential meter.

[0010] According to the method of the present invention, preferably, in the step (1), the particle size of the activated sludge is detected by a laser particle size analyzer.

[0011] According to the method of the present invention, preferably, in the step (2), different types of polyacrylamide sludge treating agents are selected according to the charge in the activated sludge, and a treatment experiment is carried out on the activated sludge to observe the size, compactness and supernatant turbidity of the flocs produced, and then the polyacrylamide sludge treating agent with the best effect is selected.

[0012] According to the method of the present invention, preferably, in step (3), the activated sludge treated with the polyacrylamide sludge treatment agent having the best treatment effect in step (2) is selected for testing.

[0013] According to the method of the present invention, preferably, in the step (3), the potential of the activated sludge after treatment is detected by a zeta potential meter and then compared with the potential of the activated sludge before treatment.

[0014] According to the method of the present invention, preferably, in the step (3), the particle size of the activated sludge after treatment is detected by a laser particle size analyzer and then compared with the particle size of the activated sludge before treatment.

[0015] According to the method of the present invention, preferably, in the step (3), a dynamic water filtration experiment is carried out using the treated activated sludge, and water is filtered by means of Buchner funnel filtration to obtain a dynamic water filtration curve.

[0016] According to the method of the present invention, preferably, in the step (3), the capillary adsorption time of the treated activated sludge is detected by a CST tester.

[0017] This detection method uses a series of equipment and instruments to systematically detect the activated sludge. Through multiple comprehensive tests, the charge in the activated sludge can be accurately known, so as to accurately determine which type of polyacrylamide sludge treatment agent is suitable. In addition, various comprehensive tests are performed on the treated activated sludge. Through this method, the particle size and charge in the activated sludge can be quickly identified, and which polyacrylamide sludge treatment agent has the best treatment effect on the activated sludge can be quickly determined. Compared with the existing technology, this method is more systematic and accurate, which is conducive to significantly improving the efficiency of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The charge distribution diagram of activated sludge detected by zeta potential meter is shown.

[0019] Figure 2 The particle size distribution diagram in activated sludge detected by laser particle size analyzer is shown.

[0020] Figure 3 The particle size distribution diagram of activated sludge before and after treatment detected by a laser particle size analyzer is shown.

[0021] Figure 4 The figure shows the amount of filtered water of activated sludge after treatment with different types of polyacrylamide sludge treatment agents.

[0022] Figure 5 The capillary adsorption time of activated sludge treated with different types of polyacrylamide sludge treatment agents is shown. DETAILED DESCRIPTION

[0023] 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.

[0024] A rapid detection method for activated sludge provided by the present invention (ie, a method for selecting an optimal sludge treatment agent by rapid detection of activated sludge) is described in detail below, but the protection scope of the present invention is not limited thereto.

[0025] 1. Detect the charge and particle size of activated sludge before treatment.

[0026] 1. Detect the charge of activated sludge before treatment.

[0027] The potential of the activated sludge is detected by a zeta potential meter to determine the charge carried by the activated sludge.

[0028] The results are as follows Figure 1 As shown, Figure 1 The charge distribution diagram of activated sludge detected by zeta potential meter is shown.

[0029] As shown in the figure, the detected charge in the activated sludge is negative, so according to the detection result, cationic polyacrylamide sludge treatment agent can be selected to treat the activated sludge.

[0030] 2. Detect the particle size of activated sludge by laser particle size analyzer.

[0031] The particle size distribution in the activated sludge was detected by a laser particle size analyzer.

[0032] The results are as follows Figure 2 As shown, Figure 2 The particle size distribution diagram in activated sludge detected by laser particle size analyzer is shown.

[0033] As shown in the figure, according to the detection analysis chart, it can be seen that when the cumulative particle size distribution in the activated sludge reaches 50%, the corresponding particle size is 63.50 μm, and when the cumulative particle size distribution reaches 97%, the corresponding particle size is 475.0 μm.

[0034] 2. Treat the activated sludge with polyacrylamide sludge treatment agent.

[0035] Based on the charge and particle size results of the above preliminary tests, the cationic polyacrylamide sludge treatment agents used in this embodiment are four cationic polyacrylamide sludge treatment agents, namely Shouxin Brand No. 4, Shouxin Brand No. 5, Shouxin Brand No. 6, and Shouxin Brand No. 7, from Guangdong Shouxin Environmental Protection Materials Technology Co., Ltd. This is only for illustration and does not limit the present method to be applicable only to this type of treatment agent. Those skilled in the art will understand that if the charge and particle size results of the above tests show that anionic polyacrylamide sludge treatment agents or other types of sludge treatment agents are applicable, anionic types or other types of sludge treatment agents are selected.

[0036] Different types of polyacrylamide sludge treatment agents are selected according to the charge in the activated sludge, and treatment experiments are carried out on the activated sludge to observe the size, compactness and supernatant turbidity of the flocs produced, and then the polyacrylamide sludge treatment agent with the best effect is selected.

[0037] 3. Test the charge, particle size, dynamic water filtration, and CST (Capillary Suction Time) capillary suction characteristics of the activated sludge after treatment.

[0038] The activated sludge treated with the cationic polyacrylamide sludge treatment agent with the best treatment effect (Shouxin Brand No. 7) was selected for the subsequent testing.

[0039] 1. Potential analysis

[0040] The potential of the activated sludge after treatment was detected by a zeta potential meter and then compared with the potential of the activated sludge before treatment.

[0041] The charge detection results before and after activated sludge treatment are shown in the following table.

[0042]

[0043] The results showed that the Zeta potential of the activated sludge before treatment was -10.58 mV, and after treatment, the Zeta potential of the activated sludge was 0.19 mV.

[0044] 2. Particle size analysis

[0045] The particle size of the activated sludge after treatment was detected by a laser particle size analyzer and then compared with the particle size of the activated sludge before treatment.

[0046] Test results such as Figure 3 shown. Figure 3 The particle size distribution diagram of activated sludge before and after treatment detected by a laser particle size analyzer is shown.

[0047] like Figure 3 As shown, the particle size of the activated sludge after treatment with the cationic polyacrylamide sludge treatment agent is much larger than the particle size before treatment.

[0048] 3. Dynamic water filtration experiment

[0049] The activated sludge treated with different types of polyacrylamide sludge treatment agents was subjected to a dynamic water filtration experiment. The water was filtered by Buchner funnel filtration, and the filterability of the activated sludge after treatment was tested to obtain a dynamic water filtration curve. The filterability of the activated sludge can be known from the curve.

[0050] The results are as follows Figure 4 shown. Figure 4 The figure shows the amount of water filtered from activated sludge after treatment with different types of polyacrylamide sludge treatment agents. It can be seen that Shouxin No. 7 cationic polyacrylamide sludge treatment agent has the best treatment effect.

[0051] 4. CST capillary water absorption test

[0052] The capillary adsorption time of the treated activated sludge was tested by CST tester.

[0053] The capillary adsorption time of activated sludge treated with different types of polyacrylamide sludge treatment agents was tested with a CST tester, and the times were 28.2 seconds (No. 4 of Shouxin brand), 27.8 seconds (No. 5 of Shouxin brand), 27.3 seconds (No. 6 of Shouxin brand), and 26.9 seconds (No. 7 of Shouxin brand), respectively, and a comparison result chart was obtained. This chart helps to understand the dewatering potential and filterability of activated sludge, so as to know which type of polyacrylamide sludge treatment agent should be quickly selected to treat the activated sludge to reduce its moisture content, so that it can be discharged smoothly.

[0054] Figure 5 The capillary adsorption time of activated sludge treated with different types of polyacrylamide sludge treatment agents is shown.

[0055] In summary, this method systematically tests the activated sludge by using a series of equipment and instruments. Through multiple comprehensive tests, the charge in the activated sludge can be accurately known, so as to accurately determine which type of polyacrylamide sludge treatment agent is suitable. In addition, various comprehensive tests are performed on the treated activated sludge. Through this method, the particle size and charge in the activated sludge can be quickly identified, and which polyacrylamide sludge treatment agent has the best treatment effect on the activated sludge can be quickly determined. Compared with the existing technology, this method is more systematic and accurate, which is conducive to significantly improving the efficiency of sewage treatment.

Claims

1. A rapid detection method for activated sludge, characterized in that The following steps are involved: (1) Detect the charge and particle size of activated sludge before treatment; (2) Treating activated sludge with polyacrylamide sludge treatment agent; (3) Detect the charge, particle size, dynamic water filtration, and CST capillary water absorption characteristics of the treated activated sludge.

2. The method according to claim 1, characterized in that In the step (1), the potential in the activated sludge is detected by a zeta potential meter.

3. The method according to claim 1, characterized in that In the step (1), the particle size of the activated sludge is detected by a laser particle size analyzer.

4. The method according to claim 1, characterized in that In the step (2), different types of polyacrylamide sludge treating agents are selected according to the charge in the activated sludge, and a treatment experiment is carried out on the activated sludge to observe the size, compactness and supernatant turbidity of the flocs produced, and then the polyacrylamide sludge treating agent with the best effect is selected.

5. The method according to claim 1, characterized in that In the step (3), the activated sludge treated with the polyacrylamide sludge treatment agent having the best treatment effect in step (2) is selected for testing.

6. The method according to claim 1, characterized in that In the step (3), the potential of the activated sludge after treatment is detected by a zeta potential meter and then compared with the potential of the activated sludge before treatment.

7. The method according to claim 1, characterized in that In the step (3), the particle size of the activated sludge after treatment is detected by a laser particle size analyzer and then compared with the particle size of the activated sludge before treatment.

8. The method according to claim 1, characterized in that In the step (3), a dynamic water filtration experiment is carried out using the treated activated sludge, and water is filtered by means of a Buchner funnel to obtain a dynamic water filtration curve.

9. The method according to claim 1, characterized in that: In the step (3), the capillary adsorption time of the treated activated sludge is tested by a CST tester.

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