• impact of fe0 amendment on methylene blue discoloration by sand columns

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 517
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the influence of metallic iron (fe0) amendment on the efficiency of sand to discolor a 2.0 mg l−1 methylene blue (mb) solution was investigated in column studies. mb was used as an indicator to identify the optimum fe0/sand ratio for efficient filtration systems. columns contained 0, 100 or 200 g of a fe0 material. the volumetric proportion of fe0 in the reactive layer of the columns with 100 g of material varied from 10% to 100%. results showed that, fe0 amendment significantly impaired mb discoloration by sand for experiments lasting for up to 132 days. early mb breakthrough in fe0/sand columns delineated the paramount importance of particle cementation, which has caused preferential flow with a negative impact on discoloration efficiency. the most efficient fe0/sand mixtures were the ones with 30–50% fe0 (v/v). these volumetric ratios correspond 33–41% weight ratios showing that the commonly used 1:1 weight ratio (50%) may not be optimal. further research with compounds exhibiting different affinities to both fe0 and sand is needed before this observation can be generalized.

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