Effects of powdered activated carbon on the coagulation-flocculation process in humic acid and humic
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dingxinda |
parašyta 02-02-2021 08:29:49
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The addition of activated carbon powder price (PAC) to remove micropollutants is a commonly used technology to improve drinking water quality. However, the effects of PAC dosing strategy on the coagulation-flocculation process of water treatment have not been well understood, especially for water with low amounts of inorganic particles. Therefore, the current research aimed to comprehensively study the effects of simultaneous addition of PAC and aluminum sulfate (AS) coagulants (denoted as PAC-AS) or adding PAC 2 h before coagulation (denoted as PAC2h-AS) on the coagulation behavior in humic acid (HA) and HA-kaolin water treatment. The results showed that the floc size, growth rate, breakage factor, and fractal dimension were all enhanced by PAC-AS and PAC2h-AS for HA but not for HA-kaolin water treatment. In HA water treatment, PAC-AS reached a larger floc size and faster growth rate, while PAC2h-AS achieved a larger floc breakage factor and fractal dimension value. For PAC2h-AS, the pre-adsorption of HA onto PAC would lower the initial particle concentration and reduce the collision probability during HA water coagulation process; thus, the DOC removal efficiency, floc size, and growth rate of PAC2h-AS were relatively smaller than those of PAC-AS. For the floc strength and floc fractal dimension, the pre-adsorption of HA onto PAC contributed to formation of stronger inter-particle bonds; thus, stronger and more compact flocs were formed by PAC2h-AS compared with those of PAC-AS. activated carbon manufacturers in usaThe addition of PAC had a smaller impact on the floc properties in HA-kaolin water treatment owing to its higher initial particle concentration. |
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FrankJScott |
parašyta 06-08-2021 18:10:34
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FrankJScott |
parašyta 13-08-2021 15:14:07
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parašyta 20-08-2021 14:40:42
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mrseo |
parašyta 20-08-2021 14:43:06
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mrseo |
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mrseo |
parašyta 20-08-2021 14:47:49
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