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Determination method for biodegradable soluble organic nitrogen in drinking water

A technology of dissolved organic nitrogen and biodegradation, which is applied in the preparation of test samples, measurement of color/spectral characteristics, and analysis through chemical reactions of materials, which can solve the problems of high concentration, long cultivation period, lack of accuracy and Accuracy and other issues, to achieve the effect of low operating cost, simple operation, high measurement accuracy

Inactive Publication Date: 2021-07-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Previous methods for measuring biodegradable dissolved organic nitrogen in sewage: the concentration of DON in sewage is high (mg / L level), the concentration of inoculum sludge required for the determination of BDON is high, and the required culture period is also long
However, the concentration of DON in drinking water samples is low (μg / L level), and the method of measuring sewage BDON to measure drinking water BDON lacks precision and accuracy.
And the inoculum from river water may not be able to degrade many kinds of DON (such as unstable DON in freshwater and seawater)

Method used

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  • Determination method for biodegradable soluble organic nitrogen in drinking water
  • Determination method for biodegradable soluble organic nitrogen in drinking water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The raw water was taken from a drinking water treatment plant, recorded as sample 1, and immediately filtered through a 0.22 μm filter membrane, and the total dissolved organic nitrogen (TDN) and ammonia nitrogen (NH 3 -N), nitrate nitrogen (NO 3 -N) and nitrite nitrogen (NO 2 -N) value, according to the formula DON (μg / L, in N) = TDN-(NH 3 -N+NO 2 -N+NO 3 -N) Calculate the concentration DON of DONi Then take 2ml of the inoculation mother solution MLSS with an initial concentration of 150mg / L and 200mL of sample 1 in a 250mL brown reagent bottle, mix well and shake evenly, and culture in the dark at a constant temperature of 25°C for 14 days. Under the same conditions, the blank test was added with sterile water culture as the control group. After the culture is over, measure the TDN and NH of the cultured water sample 3 -N, NO 3 -N and NO 2 -N value, and calculate the concentration of DON, recorded as DON f , and finally calculate the BDON value, the result is ...

Embodiment 2

[0042] Reservoir water was taken from a certain reservoir, recorded as sample 2, immediately filtered through a 0.22 μm filter membrane, and the total dissolved organic nitrogen (TDN) and ammonia nitrogen (NH 3 -N), nitrate nitrogen (NO 3 -N) and nitrite nitrogen (NO 2 -N) value, according to the formula DON (μg / L, in N) = TDN-(NH 3 -N+NO 2 -N+NO 3 -N) Calculate the concentration DON of DON i Then take 2ml of the inoculation mother solution MLSS with an initial concentration of 150mg / L and 200mL of sample 1 in a 250mL brown reagent bottle, mix well and shake evenly, and culture in the dark at a constant temperature of 25°C for 14 days. Under the same conditions, the blank test was added with sterile water culture as the control group. After the culture is over, measure the TDN and NH of the cultured water sample 3 -N, NO 3 -N and NO 2 -N value, and calculate the concentration of DON, recorded as DON f , and finally calculate the BDON value, the result is as follows f...

Embodiment 3

[0044] Prepare a glycine solution with an initial mass concentration of 1 mg / L (calculated as N), and record it as sample 3. Take 2 ml of the inoculation mother solution MLSS with an initial concentration of 150 mg / L and add it to 200 mL of glycine solution. Cultured in the dark for 14 days. Under the same conditions, the blank test was added with sterile water culture as the control group. Total dissolved organic nitrogen (TDN) and ammonia nitrogen (NH 3 -N), nitrate nitrogen (NO 3 -N) and nitrite nitrogen (NO 2 -N) value, according to the formula DON (μg / L, in N) = TDN-(NH 3 -N+NO 2 -N+NO 3 -N) calculates DON f and BDON, results such as figure 1 shown.

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Abstract

The invention discloses a determination method for biodegradable soluble organic nitrogen in drinking water, which comprises the following steps: S110, pretreating a sample to be measured, filtering a water sample to be measured by using a filter membrane, measuring the DON concentration of the filtered water sample, and recording the DON concentration as DONi; S120, preparing an inoculation mother solution, namely preparing a culture inoculation mother solution MLSS with the inoculation activated sludge concentration of 100-200mg / L; S130, carrying out mixed culture; and S140, calculating the BDON value of the water sample to be detected according to a formula BDON=DONi-DONf. The method has the beneficial effects that by adopting the method, the content of biodegradable soluble organic nitrogen in water samples such as drinking water, surface water and the like with relatively low nitrogen content can be measured, and the measurement precision is high; the method is simple to operate, the inoculation liquid is cheap and easy to obtain, the operation cost is low, and meanwhile, batch determination can be performed; the method can be applied to determination of biodegradable soluble organic nitrogen in actual water bodies such as drinking water and surface water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for measuring biodegradable dissolved organic nitrogen in drinking water. Background technique [0002] Total dissolved nitrogen in drinking water includes ammonia nitrogen, nitrate nitrogen and nitrite nitrogen and dissolved organic nitrogen (dissolved organic nitrogen, DON). Most of the inorganic nitrogen in drinking water treatment plants can be removed by nitrification-denitrification, but DON is difficult to be completely removed, while biodegradable dissolved organic nitrogen (BDON) refers to the water that can be heterotrophic The part of DON metabolized and utilized by bacteria is even more difficult to remove by chemical oxidation. The existence of BDON will not only serve as a nitrogen source for microbial growth in water distribution systems, bringing about potential microbial safety hazards, but also an important precursor of nitrogen-containing disi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/33G01N21/77G01N1/28
CPCG01N21/31G01N21/33G01N21/77G01N1/28
Inventor 楚文海张瑞华肖融
Owner TONGJI UNIV