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- W2772622767 abstract "The performance of three different types of PAC was analysed for theefficiency at which they remove natural organic matter (NOM) from untreated(raw) water, with the objective of ultimately reducing disinfection bi-product(DBP) formation. The treatment of raw water by PAC was also examined inconjunction with the addition of iron salts in the form of ferric sulphate, forcoagulation and flocculation of NOM.The optimum dosing of PAC was achieved at pH 3 and at a dose ofaround 20mgl-1which gave 32.7% removal. Coagulation could be seen to give88% removal and when used together PAC and coagulant gave between 93.6%and 97% removal of NOM.The dosing sequence of PAC and coagulant was investigated wherebyit was found that optimum removal was achieved by dosing PAC prior to dosingcoagulant, although if the delay between dosing PAC and coagulant was morethan 30 seconds it was found to impair NOM removal and increase turbidity.Scale up trials of the dosing strategy were implemented at both Ewdenwater treatment works, in Yorkshire, and at the Pilot Hall in Cranfield University.The greatest reduction in DBP formation could be seen using Norit SASuper and coagulation. Dosing this activated carbon at 20mgl-1resulted in adecrease of DBP formation by 86% in raw water and by 78.7% usingcoagulation alone. Dosing PAC before coagulant produced the lowest levels ofDBPs, which were 27.2μgl-1. This is much lower than the 80μgl-1 limit to whichwater treatment works must adhere." @default.
- W2772622767 created "2017-12-22" @default.
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- W2772622767 date "2009-06-01" @default.
- W2772622767 modified "2023-09-24" @default.
- W2772622767 title "Optimising powdered activated carbon dosing procedures for removal of natural organic matter" @default.
- W2772622767 hasPublicationYear "2009" @default.
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