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  « The effect of mixed oxidants and powdered activate »
March 3rd, 2021, 7:15am
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   The effect of mixed oxidants and powdered activate
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   Author  Topic: The effect of mixed oxidants and powdered activate  
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The effect of mixed oxidants and powdered activate
« on: December 19th, 2020, 11:00am »

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The effect of mixed oxidants and powdered activated carbon on the removal of natural organic matteractivated carbon pellets suppliers
Present paper studies the influence of electrochemically generated mixed oxidants on the physicochemical properties of natural organic matter, and especially from the disinfection by-products formation point of view. The study was carried out in a full scale water treatment plant. Results indicate that mixed oxidants favor humic to non-humic conversion of natural organic matter. Primary treatment preferentially removes the more hydrophobic fraction. This converted the non-humic fraction in an important source of disinfection by-products with a 20% contribution to the final trihalomethane formation potential (THMFPF) of the finished water. Enhanced coagulation at 40 mg l−1 of polyaluminium chloride with a moderate mixing intensity (80 rpm) and pH of 6.0 units doubled the removal efficiency of THMFPF achieved at full scale plant. However, gel permeation chromatography data revealed that low molecular weight fractions were still hardly removed. Addition of small amounts of powdered activated carbon, 50 mg l−1, allowed reduction of coagulant dose by 50% whereas removal of THMFPF was maintained or even increased. In systems where mixed oxidants are used addition of powdered activated carbon allows complementary benefits by a further reduction in the THMFPF compared to the conventional only coagulation–flocculation–settling process.yongruida carbon powder
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