Method for judging biofilm formation of activated carbon tank

Abstract

The application provides a method for judging the biofilm formation of an activated carbon pool, comprising: collecting data information; and judging the biofilm formation according to the collected information. Compared with the prior art, the technical scheme of the application has the following beneficial effects: ATP and delta pH are used for judgment, the judgment method is more scientific and simple, and the influence of water pollution is smaller, so that the application can provide strong technical support for the operation management of the ozone-biological activated carbon advanced treatment process, and also provide technical support for the popularization and application of the ozone-biological activated carbon advanced treatment process in a tap water plant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a method for judging the biofilm formation of an activated carbon tank. BACKGROUND

[0002] In recent years, with the improvement of people's requirements for drinking water quality, the ozone-biological activated carbon (O3-BAC) advanced treatment process has become one of the important measures to improve the quality of drinking water, and is more and more widely used in water supply systems at home and abroad. Water plants in Beijing, Shanghai, Guangzhou, Hangzhou and other places have begun to implement O3-BAC advanced treatment process new construction or reconstruction projects, and the research on the operation and management of O3-BAC advanced treatment process is necessary.

[0003] The purification principle of the ozone-biological activated carbon water body advanced treatment process is the combined action of activated carbon adsorption and biological degradation. The whole process can be divided into three stages. The first stage is the period when the new activated carbon is just added. In this stage, the biofilm on the surface of the activated carbon has not been formed (biofilm formation refers to the process of microorganisms growing and reproducing and gathering on the surface of the filter material to form a biofilm), and the activated carbon has a large specific surface area and developed pores. In this stage, the activated carbon adsorption is dominant, and the biological degradation is small. The second stage is the adsorption-biological degradation stage. At this time, the new activated carbon has been running for a period of time, and a layer of biofilm has been formed on the surface. Biological degradation begins to act on the surface of the activated carbon, and the activated carbon still maintains strong adsorption capacity. This stage is the combined action stage of activated carbon adsorption and biological degradation. The third stage is dominated by biological degradation. In this stage, due to the long use of activated carbon, the activated carbon pores are close to saturation, and the adsorption performance is seriously attenuated. The surface biological degradation is mainly relied on to complete the advanced treatment of water purification.

[0004] In order to enable the biological activated carbon to effectively remove pollutants in water, sufficient growth of microbial community is required. Therefore, after the new O3-BAC advanced treatment process is put into operation, and after the existing O3-BAC process replaces new activated carbon, there is a technical need to determine the biofilm formation of the activated carbon. The microbial community biomass is the most intuitive judgment method, but there are many inconveniences in actual use. In theory, biological markers can be used as an indicator to judge the biofilm, but in reality, the biological markers are often affected by the environment. For example, the existing technology reports that the dehydrogenase activity is used to determine the biofilm curve (Yuzhi Lei et al., Evaluation of the initial operation effect of biological activated carbon filter, China Water and Wastewater, 2009, Vol. 25, No. 16, pp. 93-96). The dehydrogenase activity and the biomass do not form a good corresponding relationship, and the obtained biofilm index will cause great disturbance, and the sample quantity is also large. SUMMARY

[0005] The present application aims to provide a method for determining the biofilm formation of an activated carbon pool, so as to solve the problems in the prior art.

[0006] The method for determining the biofilm formation of an activated carbon pool comprises the following steps:

[0007] Collecting data information;

[0008] According to the collected information, the biofilm formation is determined.

[0009] In a preferred embodiment, the data information is collected by any one or more of the following methods: detection at the front and / or rear end of the activated carbon pool, detection by installing a detection device in the structure, and detection by collecting samples and sending them to a detection unit.

[0010] More preferably, the samples can be collected at any one or more of the inlet, outlet, downstream of the activated carbon, and upstream of the activated carbon.

[0011] In a preferred embodiment, the data information is selected from one or more of the following: ATP level and ΔpH value, wherein the ΔpH value is the difference between the outlet pH and the inlet pH.

[0012] In a preferred embodiment, the determination method is as follows:

[0013] A preset time period and a preset ΔpH value threshold are set;

[0014] If the collected ΔpH value level is equal to or lower than the ΔpH value threshold within the preset time period, it is determined that the biofilm formation is successful.

[0015] In a preferred embodiment, the determination method is as follows:

[0016] A preset time period and a preset ATP threshold are set;

[0017] If the collected ATP level is equal to or higher than the ATP threshold within the preset time period, it is determined that the biofilm formation is successful.

[0018] In a preferred embodiment, the data is collected, preferably by collecting samples and sending them to a detection unit for detection, wherein the collected samples are preferably not more than 10g.

[0019] In a preferred embodiment, the ATP level can be measured by using an existing ATP kit.

[0020] In a preferred embodiment, the time period can be consecutive N days, N being a natural number, preferably ≥3, more preferably 3-10, and more preferably 3-5.

[0021] In a preferred embodiment, the ATP threshold value is preferably > 1000 ng / g, more preferably > 1500 ng / g.

[0022] In a preferred embodiment, the ΔpH threshold value is preferably ≤ 0.2, more preferably ≤ 0.1.

[0023] Compared with the prior art, the technical scheme of the present application has the following beneficial effects: the determination is made by ATP and ΔpH, the determination method is more scientific and simple, is less affected by water pollution, can provide strong technical support for the operation and management of the ozone-biological activated carbon advanced treatment process, and also provides technical support for the popularization and application of the ozone-biological activated carbon advanced treatment process in tap water plants. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this application, are intended to provide further understanding of the application and are incorporated herein for a purpose of explanations. The illustrative embodiments of the present application, together with its description, are used to explain the present application and are not used to limit the present application. In the drawings:

[0025] Figure 1 is a schematic diagram of the step of determining the biological membrane formation of the activated carbon pool of the present application;

[0026] Figure 2 is a curve graph of collecting ATP values to determine the biological membrane formation of the activated carbon pool of the present application;

[0027] Figure 3 is a curve graph of collecting ΔpH values to determine the biological membrane formation of the activated carbon pool of the present application. DETAILED DESCRIPTION

[0028] The present application provides a method for determining the biological membrane formation of an activated carbon pool. In order to make the purpose, technical scheme and effects of the present application more clear and explicit, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0029] Referring to Figure 1 , the method for determining the biological membrane formation of the activated carbon pool of the present application includes two steps of collecting data information and determining the membrane formation, S1 detects by installing a detection device before and / or after the activated carbon pool, and / or in the structure, and / or collects samples to send to a detection unit for detection, to collect data information for determining the membrane formation, S2 compares the obtained data information with the index determination value, to determine the biological membrane formation of the activated carbon pool.

[0030] In the following examples of the present application, the above-mentioned Shanghai Water Plant replaces the activated carbon filter material of the existing biological activated carbon filter and puts it into operation as an example. By tracking and monitoring the changes of ATP on the activated carbon and the pH values of the water in and out of the activated carbon pool, the application and evidence of the biological membrane determination method of the activated carbon pool are applied and evidenced.

[0031] Example 1

[0032] The concentration of ATP on the activated carbon of the activated carbon pool of a water plant was tracked and monitored with the change of the running time. The downstream of the activated carbon was sampled, 8g each time, and the ATP value was detected by using the commercially available ATP kit.

[0033] As shown in Figure 2 , when the activated carbon filter replaces the activated carbon filter material and just puts it into operation, the ATP concentration on the activated carbon is low, and when it is put into operation for about 41d, the ATP concentration is 439.0ng / g. The ATP concentration on the activated carbon gradually increases with the extension of the running time of the activated carbon pool, and after about 60d, the increasing speed gradually slows down. The ATP concentration on the activated carbon can be maintained at a concentration level of 1500ng / g and above for five consecutive days, so it can be determined that the membrane is successful. Thereafter, the ATP concentration on the activated carbon still increases slowly, and when it is about 400d, the ATP concentration can reach 37000ng / g, which is caused by the increase of the microbial substrate value on the activated carbon with the extension of the running time. This is consistent with the observed change of the biomass of the microbial community, which shows that ATP as an index for evaluating the biological membrane of the activated carbon pool is feasible.

[0034] In addition, during the sampling dates of 2021 / 7 / 23-2021 / 9 / 23, the ATP value did not show a very obvious downward or upward trend, and the overall trend of the curve did not change significantly before or after. It shows that the influence of the environment on the determination of ATP value in this example can be ignored.

[0035] Example 2

[0036] The change of the pH value of the water in and out of the activated carbon pool of a water plant with the running time was tracked and monitored. The water inlet and outlet were sampled each time, and the pH value of the water in and out was detected.

[0037] As shown in Figure 3 , the pH of the water in the activated carbon pool was maintained at 7.2-8.06, and the pH of the water out of the activated carbon pool was maintained at 7.11-8.04. The pH of the water out of the activated carbon pool was basically lower than that of the water in, and after about 60d, the pH of the water out of the activated carbon pool could be reduced to 0.1 or less than the pH of the water in, and for five consecutive days, it was less than 0.1, which further evidenced the change of the ATP of the activated carbon pool.

[0038] Referring to Figure 2Wherein, the pH value of the activated carbon pool inlet water in summer (2021 / 7 / 16-2021 / 9 / 16) is slightly reduced, which may be related to the increase of coagulant dosage and the adjustment of process parameters in waterworks in summer. The pH value of raw water in summer increases slightly with the increase of water temperature. In order to reduce the adverse effects of pH value and high algae on the subsequent process of waterworks, the pre-ozone and coagulant dosages are increased in the pre-ozone and coagulation sedimentation process stage, so as to cause the pH value of the sedimentation effluent (i.e. the pH value of the carbon pool inlet water) to be slightly reduced.

[0039] However, this environmental change has no obvious influence on the ΔpH value, such as Figure 2 In summer, the ΔpH value is basically on the same straight line as the values before and after.

[0040] After long-term use, the microbial substrate value on the activated carbon increases, and the ΔpH value decreases slightly, but the overall influence is not large, and it can better characterize the overall activity of the biofilm microorganisms.

[0041] The specific embodiments of the present application are described in detail above, but it is only as an example, and the present application is not limited to the specific embodiments described above. Any equivalent modification and substitution of the present application for those skilled in the art is also within the scope of the present application. Therefore, any equivalent transformation and modification without departing from the spirit and scope of the present application should be covered within the scope of the present application.

Claims

1. A method for determining the biofilm formation state of an activated carbon tank, characterized by, Comprising: Collecting data information by any one or more of the following ways: detecting before and / or after the activated carbon pool, and / or installing detection devices in the structure to detect, and / or collecting samples and sending them to a detection unit for detection; According to the collected information, the biological membrane situation is determined, including: In a predetermined time period, the ATP level on the activated carbon is collected, and the ∆pH value level of the activated carbon pool inlet and outlet water is calculated, wherein the ∆pH value is the difference between the outlet water pH value and the inlet water pH value; When it is monitored that the ATP concentration on the activated carbon reaches 1500 ng / g and above for 5 consecutive days, and the ∆pH value is less than 0.1 for 5 consecutive days, it is determined that the activated carbon is successfully membrane-biofouled.

2. The method of claim 1, wherein, The collected sample does not exceed 10g.

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