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Evaluation of Mass-Transfer Coefficient of Free Fall – Cascade-Aerator

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Abstract

The mass-transfer coefficient of a free-fall cascade-aeratorunit of 15 million litres per day was evaluated for its efficiency in the removal of a class of volatile organics, the trihalomethanes(THMs). These compounds are carcinogenic and occur as a resultof chlorination of natural waters. Due to the volatile nature ofthe THMs, the efficiency of aeration as a potential techniquefor their removal has been studied. The principle behindaeration is gas-transfer, according to which the gas-liquidinterface is hypothesized to consist of a gas and liquid filmthrough which gas is transferred by molecular diffusion untilequilibrium is attained. The overall mass transfer coefficient(K L) of the aerator considering oxygen as the reference compound, was found to be29.3 hr-1 for THMs.

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Authors and Affiliations

  1. National Environmental Engineering Research Institute, Nagpur, India

    N. P. Thacker, S. L. Katkar & A. Rudra

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  1. N. P. Thacker
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  2. S. L. Katkar
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  3. A. Rudra
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Correspondence to N. P. Thacker.

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Thacker, N.P., Katkar, S.L. & Rudra, A. Evaluation of Mass-Transfer Coefficient of Free Fall – Cascade-Aerator. Environ Monit Assess 74, 1–9 (2002). https://doi.org/10.1023/A:1013809819910

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  • DOI: https://doi.org/10.1023/A:1013809819910

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