Functionalized cationic polyamines and their use to reduce the ndma formation during the treatment of aqueous systems, and applications in the water treatment industry, including wastewater and drinking water treatment processes
a functionalized cationic polyamine and water treatment technology, applied in the field of new functionalized cationic polyamines, can solve the problems of increasing concern over the presence of potentially harmful levels of ndma in drinking water sources, complex ndma formation pathway during water treatment processes, and still unfulfilled understanding of the phenomenon of ndma formation pathway, so as to achieve the effect of attenuating the ndma problem
Inactive Publication Date: 2011-10-20
S P C M SA
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Benefits of technology
[0003]Among those applications, their use as coagulation / flocculation agents in drinking water or wastewater treatment was reported to have a considerable number of advantages (lower dosage required, lower volumes of sludge produced . . . ) compared with standard mineral coagulants.
Problems solved by technology
However, its presence in drinking water sources at potentially harmful levels is of increasing concern as NDMA does not readily biodegrade, adsorb, or volatilize.
The NDMA formation pathway during water treatment processes is a highly complex phenomenon and is still not fully understood.
Method used
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example 2
[0057]The polyamines were used in various concentrations in a coagulation process on Mississippi river water. After optimization of the coagulation, floes were allowed to settle and supernatant was collected and exposed to various amounts of disinfection reagent (preformed monochloramine) for various exposure times. Reactions were quenched by ascorbic acid before NDMA analysis.
[0058]This example is supposed to better mimic real water treatment plant conditions with limited contact time and exposure of the polymer to the disinfection reagent.
% ofNDMATheoreticalReduc-PolyamineAlumi-ChainDisinfectanttionDescription +numEndContact Time +Effi-Dosage**sulfateEquivalentsDosage*ciencyBranched @ 3 mg / L 0 mg / L 1%4 hours @ 4 mg / L 9%Branched @ 3 mg / L 0 mg / L 10%2 hours @ 4 mg / L18%Branched @ 3 mg / L 0 mg / L100%2 hours @ 4 mg / L39%Branched @ 3 mg / L 0 mg / L100%4 hours @ 4 mg / L51%Branched @ 0.5 mg / L90 mg / L 10%2 hours @ 4 mg / L37%Branched @ 0.5 mg / L90 mg / L100%2 hours @ 4 mg / L58%Linear @ 3 mg / L 0 mg / L100%2...
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Abstract
New water treatment chemicals and corresponding water treatment or more generally aqueous systems treatment processes are provided, which greatly attenuate the NDMA problem, that is, decrease the formation of NDMA during the water or aqueous system treatment namely in the presence of a disinfectant, and decrease too the level of NDMA in the so treated water of the aqueous system, and in the end products such as drinking water.
Description
[0001]This invention relates to new functionalized cationic polyamines and their uses and, more particularly, to linear or branched polyamines also known as (epichlorohydrin-dimethylamine) based polymers end-capped with, at least, one alkylating agent.[0002]The uses of polyamines in various industrial applications are well known. Mention may be made of their uses in water treatment, the papermaking industry, the mining industry, the textile industry, etc. . . . .[0003]Among those applications, their use as coagulation / flocculation agents in drinking water or wastewater treatment was reported to have a considerable number of advantages (lower dosage required, lower volumes of sludge produced . . . ) compared with standard mineral coagulants.[0004]It is to be noted that the terms flocculent and coagulant are often used interchangeably. However, coagulants are chemicals that promote particle destabilisation by charge neutralisation (and therefore assist in color and turbidity removal) ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C07C211/63C07C209/00
CPCC02F1/56C02F2101/38C02F1/5272C08G73/022C02F2303/04
Inventor FAVERO, CEDRICKTAYLOR, AMELIA E.
Owner S P C M SA