散水濾床廃水処理装置の動力効率 : プラスチック濾床

概要

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The power economy, which is defined as the amount of BOD removed per unit power consumption, of trickling filter with plastic media was predicted and discussed under varied practical operating conditions.A mathematical model previously presented by one of the authors was used to predict the BOD removal performance in the filter, where a revised value of the rate constant was obtained and used from the test operating data in a full-scale plant.<BR>The increase in filter depth and in recycle ratio of effluent enhances the BOD removal rate per both the unit volume and unit sectional area of the filter media, but will lead to lowering the power economy.Under normal operating conditions designated by the structural standard of community plants in Japan, sufficient quality of the effluent can be expected, but the power economy of the plants will show rather low values. In order to equalize the daily fluctuation of influent loading, the operation to maintaining constant irrigation rate to the filter media is effective, but in this operation, the decrease in the power economy will not be avoided, in comparison with the case when the equalization tank in front of the filter is applied.