Control method for disinfection by-product based on matching of precursor form and flocculating agent form
A technology of disinfection by-products and control methods, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve problems such as the interaction relationship and reaction process of the precursors of disinfection by-products without consideration, so as to reduce the oxygen consumption of factory water and improve efficiency effect
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Embodiment 1
[0029] The humic acid water sample simulates the natural water body, and the alkalinity is 100mg / L (as CaCO 3 meter), the turbidity is 20NTU, and the dissolved organic carbon DOC is 3.96mg / L.
[0030] Judgment of the morphology of the precursors of disinfection by-products: the ultrafiltration fractionation method was used to determine that the precursors of high molecular weight (>100kDa) THMs accounted for 83%, and the initial concentration was 80.2μg / mg C.
[0031] In-situ form enhancement of flocculant during coagulation: polyaluminum chloride flocculant is selected, and the dosage is 19.9mg / L. After flocculant is added, stir rapidly at 200rpm / min for 2 minutes, and adjust rapidly during the rapid stirring process pH to 5.5, the dominant form is prefabricated Al 13 Morphology, then, 40rpm / min slow stirring for 15 minutes, settling for 30 minutes. The THMs precursor concentration reached 27.7 μg / mg C after coagulation treatment, which was 42.4% higher than the traditional...
Embodiment 2
[0033] The humic acid water sample simulates the natural water body, and the alkalinity is 100mg / L (as CaCO 3 meter), the turbidity is 20NTU, and the dissolved organic carbon DOC is 2.34mg / L.
[0034] Judgment of the form of the precursor of disinfection by-products: the form of the precursor of low molecular weight (<3kDa) HAAs was determined to account for 71% by ultrafiltration classification method, and the initial concentration was 28.1 μg / mg C.
[0035] In-situ morphology strengthening of flocculant during coagulation: choose traditional flocculant AlCl 3 , the dosage is 9.3mg / L. After the flocculant is added, stir rapidly at 200rpm / min for 2 minutes, and adjust the pH to 5.5 rapidly during the rapid stirring process. The dominant form is in-situ hydrolysis of Al 13 Morphology, then, 40rpm / min slow stirring for 15 minutes, settling for 30 minutes. After coagulation treatment, the concentration of HAAs precursor reached 10.9 μg / mg C, which was 56.7% higher than the trad...
Embodiment 3
[0037] The humic acid water sample simulates the natural water body, and the alkalinity is 100mg / L (as CaCO 3 meter), the turbidity is 20NTU, and the dissolved organic carbon DOC is 2.36mg / L.
[0038] Determination of the morphology of the precursors of disinfection by-products: the ultrafiltration fractionation method was used to determine that the precursors of HAAs in the high molecular weight range (30-100kDa) accounted for 79%, and the initial concentration was 19.5μg / mg C.
[0039] In-situ form enhancement of flocculant during coagulation: choose polyaluminum chloride flocculant, dosage is 11.9mg / L, after adding flocculant, stir rapidly at 200rpm / min for 2 minutes, adjust rapidly during rapid stirring When the pH reaches 7.5, the dominant form is aggregated Al 13 Morphology, then, 40rpm / min slow stirring for 15 minutes, settling for 30 minutes. After coagulation treatment, the concentration of HAAs precursor reached 6.1 μg / mg C, which was 27.9% higher than the traditio...
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