A method for determining the generation potential of iodine-based methane disinfection by-products in water
A disinfection by-product, methyl iodide technology, applied in the field of municipal water supply and drainage and environmental engineering
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Embodiment 1
[0029] Chloramine was used as a disinfectant to test the effect of different reaction times on the production concentration of iodomethanes (I-THMs)
[0030] (1) Pass the water sample to be tested through a 0.45μm filter membrane to measure the dissolved organic carbon (DOC) of the water sample, and calculate the dosage of chloramine according to 3 times the DOC. Among them, the DOC of the Yangtze River water is 1.83mg / L, and the dosage of chloramine is 5.5mg / L;
[0031] Take 50mL water sample in a beaker, add 100μg / L iodide ion, add 10mM potassium dihydrogen phosphate or sodium dihydrogen phosphate buffer solution, place on a constant temperature magnetic stirrer, adjust the pH of the solution to 7.0 (pH The determination of the value is one of the key parts of this patent), adding the NH calculated above 2 Cl solution, then pour it into a 45mL ampule bottle until it overflows, seal the container with a polytetrafluoroethylene gasket cover, and ensure that there are no air b...
Embodiment 2
[0037] Example 2 uses chloramine as a disinfectant to test the effect of different reaction pH values on the production concentration of iodomethanes (I-THMs).
[0038] (1) The water sample to be tested in the present invention is Yangtze River water. The dissolved organic carbon (DOC) of the water sample is measured after passing the water sample to be tested through a 0.45 μm filter membrane. The DOC is 1.83 mg / L, and the obtained value is expressed as Dosing 3 times DOC with chloramine, the specific dosage of chloramine is 5.5mg / L, in which 100μg / L iodide ion is added to the water sample;
[0039] Adjust the pH value of the water samples containing iodine ions to 5, 6, 7, 8, 9, add the disinfectant chloramine to the water samples containing iodine ions, and react in the dark for 7 days, so that the disinfectant and the water samples containing iodine ions The reaction produces iodomethanes (I-THMs);
[0040] Among them, in order to ensure the accuracy of the chloraminati...
Embodiment 3
[0047] Sodium hypochlorite as a disinfectant
[0048] (1) Measure the dissolved organic carbon (DOC) of the water sample after passing it through a 0.45μm filter membrane. The DOC of the Yangtze River water is 1.83mg / L; L) Calculate the dosage of sodium hypochlorite;
[0049] Add iodide ions to the water sample so that the concentration of iodide ions in the water sample is 100 μg / L; adjust the pH of the water sample containing iodine ions to 7.0±0.02, and then add disinfectant chlorine at 10 times the DOC to make the disinfectant and Water samples containing iodide ions react to form iodomethanes (I-THMs); the reaction temperature is 25±2°C (because liquid chlorine and chlorine gas have certain safety hazards, the laboratory usually uses NaClO instead of dosing in the actual water plant The liquid chlorine and chlorine gas are carried out experimental research. In this example, the NaClO mother liquor that adopts sigma company's available chlorine content to be about 50g / L);...
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Abstract
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