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Prediction of the Effect of Recirculation on the Effluent Quality of Anaerobic Filters by Empirical Models
Author(s) -
Yu Hanqing,
Wilson Francis,
Tay JooHwa
Publication year - 2000
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143000x137374
Subject(s) - anaerobic filter , effluent , anaerobic exercise , wastewater , filter (signal processing) , chemical oxygen demand , pulp and paper industry , environmental science , sewage treatment , environmental engineering , chemistry , anaerobic digestion , engineering , biology , methane , physiology , organic chemistry , electrical engineering
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 ( r t ) for the anaerobic filter treating soybean wastewater. It was predicted that recirculation with a ratio less than r t would reduce output COD concentration and enhance performance of the anaerobic fiter, whereas recirculation with a ratio beyond r t would result in a greater output COD concentration and thus adversely influence performance. Subsequent experiments verified these predictions.