TWI401214B - Early Warning Mode and Detection Method of Water Quality Excellent Oxidation - Google Patents

Description

Early warning mode of water quality oxidation and its detection method

The invention relates to a method for detecting water quality, in particular to a method for predicting whether water quality is preferentially oxidized by using a ratio of nitrogen to phosphorus in a water body.

According to the water body eutrophication, the lake, the reservoir or the breeding pond is exposed to excessive nutrients, so that the algae have sufficient nutrients to multiply. The main source of nutrients is the agriculture of the water area, the activities of the community residents or other human factors. The various pollutants caused by the accumulation of pollutants are accumulated in the catchment area. When heavy rain occurs, the pollutants will be brought into the water area, and a large amount of nutrient salts will be brought into the water body, resulting in the massive reproduction of phytoplankton in the water body, thus causing The rapid changes in the water ecosystem have caused serious deterioration of water quality. In other words, the eutrophication of water will cause algae to multiply.

In general, the main factors affecting algae growth are nutrient salts, sunshine, temperature, wind field, climate, and residence time. The most important one is nutrient salt. In recent years, as humans increase the use of pesticides, fertilizers, bait and washing powder, and the production of large amounts of sewage, the phenomenon of accelerated water quality is caused. When algae are multiplied, algal blooms are often produced. Algal blooms often form poison with algae poisoning, which may cause malodors. Because of the photosynthesis and respiration of algae, the difference in dissolved oxygen content between water and water is large, when algae are at night. When respiration or a large number of algae die, it will quickly consume the dissolved oxygen in the water, often causing the dissolved oxygen in the water to be too low, and in an oxygen-deficient state, causing the fish and other aquatic organisms to survive, and the body also causes the water body to produce a foul smell. This is the water body. The phenomenon caused by eutrophication.

Therefore, it can be seen that there is too much nutrient salt in the water body to cause excellent oxidation, which will cause a large amount of algae growth, which will have a very serious impact on water quality. For example, the excellent oxidation of water in the reservoir will not only shorten the life of the reservoir but also increase it. Water treatment costs. Therefore, many studies are devoted to monitoring water quality changes, hoping to prevent the phenomenon of water oxidation in advance, but in the past, most of the predictions of water body eutrophication rely on the rule of thumb, such as changes in wind direction, climate, temperature and other factors. Etc. However, this type of prediction lacks a scientific basis and cannot accurately predict the occurrence of superior oxidation, so the results are not effective.

The main object of the present invention is to provide an early warning mode for water quality oxidation and a detection method thereof, and establish an effective management method for establishing a water body ecological environment by dynamically changing the nitrogen-phosphorus ratio and chlorophyll A in a water body.

Another object of the present invention is to provide an early warning mode for water quality oxidation and a detection method thereof. It is only necessary to measure and calculate the ratio of nitrogen to phosphorus in a water body, and it is simple and effective to predict whether or not preferential oxidation occurs.

In order to achieve the above object, the present invention provides an early warning mode for water quality superior oxidation, which utilizes the relationship between the nitrogen/phosphorus ratio (N/P) of a water body and the chlorophyll A concentration (Chl.a) of the water body. Sexuality, to achieve the effect of warning whether the water body is excellent in oxidation. Furthermore, the early warning mode of water quality oxidation includes the following steps: (1) selecting the sampling site; (2) collecting the water sample and measuring the nitrogen to phosphorus ratio and the concentration of chlorophyll A of the water sample; (3) establishing data association (4) define and analyze the data relevance.

The invention also provides an early warning mode for water quality oxidation and a monitoring method thereof, which comprises the following steps: (1) selecting a sampling location; (2) collecting a water sample and measuring a ratio of nitrogen to phosphorus and a concentration of chlorophyll A of the water sample; 3) Establish data correlation; (4) Define and analyze the data relevance; (5) Monitor water quality to determine whether the water body is excellent for oxidation.

Hereinafter, a preferred embodiment of the present invention will be further described with reference to the drawings.

The first figure is a flow chart of the method for the early warning mode of water quality oxidation in the present invention.

The second figure is a flow chart of the early warning mode of water quality oxidation and the monitoring method thereof in the present invention.

The third figure is a schematic diagram of measured data of an embodiment of the present invention.

The invention discloses an early warning mode for water quality oxidation and a monitoring method thereof. First, regarding the early warning mode of water quality oxidation, the nitrogen-phosphorus ratio (N/P) of a water body and the chlorophyll-methyl concentration (Chl.a) of the water body are presented in a power relationship, and the ratio of nitrogen to phosphorus is X. The axis, the concentration of chlorophyll A is the Y axis, and the relationship between the two is Y=AX ^-B and is a concave curve. The judgment value of water oxidation is defined as the concentration of chlorophyll A exceeds 10 μg / L, so when the water body When the ratio of nitrogen to phosphorus is less than 10 ^{(log(A/10))/B} , the water system is excellent in oxidation; wherein A and B are the first coefficient and the second coefficient, respectively, and the A and B values are The water changes from place to place.

Further, please refer to the first figure, the warning mode of water quality oxidation, which includes the following steps:

First, select the sampling location (11).

2. Collecting water samples and measuring (12): separately collect water bodies of different areas as water samples at different times, and then measure the nitrogen-phosphorus ratio (N/P) and chlorophyll-methyl concentration of each water sample by instrument ( Chl.a), at least two sets of values are obtained. Among them, the method of taking water samples is in accordance with the "Environmental Sampling Method of Huhechibo Reservoir" published by the Environmental Protection Department of the Executive Yuan, No. 02198, and the detection method is based on the "General Principles of Water Quality Testing Methods" in the Announcement No. 094001591 of the Environmental Protection Department. Nitrogen content, phosphorus content and chlorophyll A concentration in water samples.

Third, establish data correlation (13): set the Y axis to the chlorophyll A concentration (Chl.a), the X axis to the nitrogen to phosphorus ratio (N / P), get a concave curve, the chlorophyll A concentration and the Nitrogen and phosphorus have a power relationship between the two, and the relationship is Y=AX ^-B . Among them, A and B are the first coefficient and the second coefficient, respectively, and the first coefficient A and the second coefficient B are both It will change with different water bodies and environments.

Fourth, the operation analysis (14): the water body chlorophyll A concentration is defined as more than 10μg / L, then the water body is eutrophication phenomenon, so the relationship between the nitrogen and phosphorus ratio can be less than 10 ^{(log (A/10) When /B} , the water body will produce excellent oxidation.

Secondly, please refer to the second figure, regarding the early warning mode of water quality oxidation of the present invention and its monitoring method, which comprises the following steps:

First, select the sampling location (21), for example, select a breeding pond.

2. Collecting water samples and measuring (22): Collect water bodies in different areas of the site at different times as water samples, and then measure the nitrogen and phosphorus contents and chlorophyll A concentration of each water sample by the instrument (Chl. a) Calculate the ratio of nitrogen to phosphorus (N/P) in the water sample, at least two sets of values are obtained.

Third, establish data correlation (23): set the Y axis to the chlorophyll A concentration (Chl.a), the X axis to the nitrogen to phosphorus ratio (N / P), from step 2 (22) can get a concave curve, The chlorophyll-methyl concentration and the nitrogen-phosphorus ratio exhibit a power relationship, and the relationship is Y=AX- ^B ; wherein A and B are the first coefficient and the second coefficient, respectively.

Fourth, the operation analysis (24): the water body chlorophyll A concentration is defined as more than 10μg / L, then the water body is eutrophic, so the relationship can be obtained 10 ^{(log (A/10)) / B} The critical value of excellent oxidation occurs.

V. Monitoring water quality: Regularly take any water in the water body as a water sample, measure the nitrogen content and phosphorus content of the water sample by instrument, and find the nitrogen-phosphorus ratio, and then compare whether the nitrogen-phosphorus ratio is less than the critical value of excellent oxidation. That is, the monitoring and warning of the effect of the oxidation of the water body is achieved.

Please refer to the third figure, which is a schematic diagram of the measured data of the embodiment of the warning mode for water quality oxidation of the present invention. A breeding pond is selected as a sampling site, and about 20 groups of water samples in different regions are taken in different seasons, respectively. Nitrogen content, phosphorus content and chlorophyll A concentration of each of the water samples. The Y-axis represents the concentration of chlorophyll-methyl, and the X-axis represents the ratio of nitrogen to phosphorus in the water. The first coefficient A is calculated to be 3.468, and the second coefficient B is 0.4847, that is, the relationship is Y=3.468X- ^0.4847 . Since the concentration of chlorophyll A is greater than 10 μg/L, the culture pond will undergo excellent oxidation. In other words, when Y=3.468X ^-0.4847 ≧10, the culture pond will undergo excellent oxidation. Therefore, through calculation, the ratio of nitrogen to phosphorus in the culture pond can be measured in the future. As long as the ratio of nitrogen to phosphorus approaches 10 ^{(log 0.3468) / 0.4847} , it can be judged that the oxidation pond may be preferentially oxidized.

In summary, the effects of the present invention can be summarized as follows:

1. Establish an effective management method for the aquatic ecosystem by monitoring the nitrogen-phosphorus ratio and the dynamic change of chlorophyll A in a water body.

2. To provide a simple and effective method for predicting the oxidation of water bodies. It is only necessary to use the instrument to calculate the ratio of nitrogen to phosphorus in a water body, so as to whether the water body has the possibility of producing excellent oxidation in the near future.

3. An objective historical database can be established. According to the invention, the nitrogen and phosphorus contents and the chlorophyll A concentration in different regions of the water body need to be recorded, and the future can also be provided for analysis or research, or as a further integration. in accordance with.

(11) (21). . . Selected sampling location

(12) (22). . . Collecting water samples and measuring

(13)(23). . . Establish data relevance

(14)(24). . . Definition and analysis

(25). . . Monitoring water quality

The first figure is a flow chart of the method for the early warning mode of water quality oxidation in the present invention.

The second figure is a flow chart of the early warning mode of water quality oxidation and the monitoring method thereof in the present invention.

The third figure is a schematic diagram of measured data of an embodiment of the present invention.

(twenty one). . . Selected sampling location

(twenty two). . . Collecting water samples and measuring

(twenty three). . . Establish data relevance

(twenty four). . . Definition and analysis

(25). . . Monitoring water quality

Claims (3)

An early warning mode for water quality oxidation, in which the ratio of nitrogen to phosphorus (N/P) of a water body and the concentration of chlorophyll A (Chl.a) of the water body are in a power relationship, respectively, and different regions are collected at different times. The water body is used as a water sample, and the nitrogen-phosphorus ratio (N/P) and the chlorophyll-methyl concentration (Chl.a) of each water sample are respectively measured, and the nitrogen-phosphorus ratio of each water sample is the X-axis coordinate and the chlorophyll A. The concentration is the Y-axis coordinate, and there is a graph relationship between the two is Y=AX- ^B and is a graph; the judgment value of water oxidation is defined as the concentration of chlorophyll A (Y) exceeds 10 μg/L, so when the water body When the ratio of nitrogen to phosphorus (X) is less than 10 ^{(log(A/10))/B} , the water system is excellent in oxidation; wherein A and B are the first coefficient and the second coefficient respectively, and with different water bodies and Defined by the environment. An early warning mode for excellent oxidation of water quality, comprising the following steps: 1. selecting a sampling location; 2. collecting water samples and measuring: collecting water bodies of different regions at different times as water samples, and respectively measuring the water samples. Nitrogen-phosphorus ratio (N/P) and chlorophyll-methyl concentration (Chl.a); Third, establish data correlation: Y-axis coordinates represent chlorophyll-methyl concentration (Chl.a), and X-axis coordinates represent nitrogen-phosphorus ratio (N/P) ), the nitrogen-phosphorus ratio of each water sample is the X-axis coordinate and the chlorophyll-methyl concentration is the Y-axis coordinate, and there is a graph, and the relationship between the chlorophyll-methyl concentration and the nitrogen-phosphorus ratio is a power relationship. Y=AX ^-B ; where A and B are the first coefficient and the second coefficient, respectively, and are defined with different water bodies and environments; 4. Definition and analysis: The water chlorophyll A concentration is defined as more than 10 μg/L, Then, the water body is eutrophicated. Therefore, when the nitrogen-phosphorus ratio of the relationship is less than 10 ^{(log(A/10))/B} , the water body is excellent in oxidation. An early warning mode for water quality oxidation and a monitoring method thereof, comprising the following steps: 1. selecting a sampling location; 2. collecting water samples and measuring: collecting water bodies of different regions at different times as water samples, and respectively measuring each The nitrogen-phosphorus ratio (N/P) and chlorophyll-methyl concentration (Chl.a) of the water sample; 3. Establish data correlation: the chlorophyll-methyl concentration (Chl.a) is represented by the Y-axis coordinate, and the nitrogen-phosphorus ratio is represented by the X-axis coordinate. (N/P), the nitrogen-phosphorus ratio of each water sample is the X-axis coordinate and the chlorophyll-methyl concentration is the Y-axis coordinate, and there is a graph, and the chlorophyll-methyl concentration and the nitrogen-phosphorus ratio exhibit a power relationship. , the relationship is Y=AX ^-B ; wherein A and B are the first coefficient and the second coefficient respectively and are defined with different water bodies and environments; 4. Definition and analysis: the concentration of the chlorophyll A is defined as exceeding 10μg/L, the phenomenon of water body eutrophication occurs, so when the nitrogen-phosphorus ratio is less than the critical value of excellent oxidation, the water body will produce excellent oxidation; wherein the critical value is 10 ^{(log(A/10))/B} 5. Monitoring water quality: regularly take any water in the water body as a water sample, and measure the nitrogen of the water sample by instrument And the amount of phosphorus content, and the nitrogen to phosphorus ratio is obtained, and then comparing the ratio of the size of nitrogen and phosphorus with the threshold value, i.e. to achieve excellent effect monitoring and warning of the oxidation of water.