Advanced treatment of sewage by pre-coagulation and biofilm process

Treatment performance and operational parameters of a pre-coagulation and biofilm process were experimentally discussed with the pilot-scale plant treating actual municipal sewage. Perfect nitrification was accomplished within total hydraulic retention time (HRT) of 4 h at 20% volumetric added ratio...

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Bibliographic Details
Published in:Water science and technology 2001, Vol.43 (1), p.327-334
Main Authors: TSUNO, H, SOMIYA, I, KANJO, Y, HIDAKA, T
Format: Article
Language:English
Subjects:
Applied sciences
Bacteria
Biofilms
Biological and medical sciences
Biological treatment of waters
Biotechnology
Coagulation
Cold season
Environment and pollution
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Growth media
Hydraulic retention time
Industrial applications and implications. Economical aspects
Municipal wastes
Municipal wastewater
Nitrification
Nitrogen
Nitrogen - metabolism
Organic Chemicals - metabolism
Organic matter
Organic phosphorus
Other wastewaters
Phosphorus - metabolism
Phosphorus removal
Pilot Projects
Pollution
Refuse Disposal - methods
Retention time
Sewage
Sewage - microbiology
Sewage disposal
Sewage treatment
Wastewater treatment
Wastewaters
Water Movements
Water Pollution - prevention & control
Water treatment and pollution
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Summary:Treatment performance and operational parameters of a pre-coagulation and biofilm process were experimentally discussed with the pilot-scale plant treating actual municipal sewage. Perfect nitrification was accomplished within total hydraulic retention time (HRT) of 4 h at 20% volumetric added ratio of attached-growth media of biofilm in the aerobic tanks under temperature conditions as low as 17 degrees C. Treatment efficiencies in organic matter, T-N and T-P were high and stable with the total HRT of 8 h in the biological reactor. Concentrations of T-N and T-P in effluent were kept about 2 mgN/L and under 1 mgP/L, respectively. Attached growth bacterial mass and the potential activity of nitrification and denitrification in each tank in cold season were high enough to accomplish excellent treatment performance. Then the process was proved to be applicable to municipal sewage treatment for removal of nitrogen and phosphorus as well as organic matter.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2001.0064