Prediction of the Effect of Recirculation on the Effluent Quality of Anaerobic Filters by Empirical Models

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The action of effluent recirculation on an anaerobic filter is complex, and there has been no consensus about its effect. In this study two models, established through linear regression analyses of experimental results from two anaerobic filters without recirculation, were modified and used to predict the effect of recirculation on effluent quality of anaerobic filters. The form of the models suggested that effluent recirculation would increase the output chemical oxygen demand (COD) concentration of the anaerobic filter treating municipal wastewater, whereas the effect of recirculation on the anaerobic filter treating soybean processing wastewater would be more complex. For a given raw COD concentration and hydraulic loading rate, it was predicted that there would be a threshold recirculation ratio (rt ) for the anaerobic filter treating soybean wastewater. It was predicted that recirculation with a ratio less than rt would reduce output COD concentration and enhance performance of the anaerobic fiter, whereas recirculation with a ratio beyond rt would result in a greater output COD concentration and thus adversely influence performance. Subsequent experiments verified these predictions.
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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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