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2000•Journal of Wuhan Yejin University of Science and TechnologyRequires access

Treatment of Municipal Sewage by Two-stage Biological Aerated Filter

Lei Guo-yuan

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Abstract

The pilot test in which municipal sewage is treated by biological aerated filter (BAF) with burned clay pellets as microorganism carriers is carried out with scale of 12m~3 /d .The effects of filtration velocity, gas-to-sewage ratio, overloading and backwashing on the performance of BAF are investigated. The results show: (1) under the conditions of sewage temperature range of (20～23.5)℃,filtration velocity range of (6.09～8.21)m/h,gas-to-sewage ratio of 1∶1 for biocarbone aerated filter and 2∶1 for bio-nitrification filter,the effluent of BAF reach the water standards for miscellaneous use in living from COD (120～338)mg/L and NH~+ 4-N(30.0～53.6)mg/L of influent of BAF ;(2) overloading and backwashing have no remarkable effects on the quality of effluent.

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What this paper is about

The pilot test in which municipal sewage is treated by biological aerated filter (BAF) with burned clay pellets as microorganism carriers is carried out with scale of 12m~3 /d .The effects of filtration velocity, gas-to-sewage ratio, overloading and backwashing on the performance of BAF are investigated. The results show: (1) under the conditions of sewage temperature range of (20～23.5)℃,filtration velocity range of (6.09～8.21)m/h,gas-to-sewage ratio of 1∶1 for biocarbone aerated filter and 2∶1 for bio-nitrification filter,the effluent of BAF reach the water standards for miscellaneous use in living from COD (120～338)mg/L and NH~+ 4-N(30.0～53.6)mg/L of influent of BAF ;(2) overloading and backwashing have no remarkable effects on the quality of effluent.

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Available abstract

The pilot test in which municipal sewage is treated by biological aerated filter (BAF) with burned clay pellets as microorganism carriers is carried out with scale of 12m~3 /d .The effects of filtration velocity, gas-to-sewage ratio, overloading and backwashing on the performance of BAF are investigated. The results show: (1) under the conditions of sewage temperature range of (20～23.5)℃,filtration velocity range of (6.09～8.21)m/h,gas-to-sewage ratio of 1∶1 for biocarbone aerated filter and 2∶1 for bio-nitrification filter,the effluent of BAF reach the water standards for miscellaneous use in living from COD (120～338)mg/L and NH~+ 4-N(30.0～53.6)mg/L of influent of BAF ;(2) overloading and backwashing have no remarkable effects on the quality of effluent.

Key concepts: Backwashing, Aeration, Effluent, Sewage, Filtration (mathematics), Environmental science, Nitrification, Filter (signal processing)

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