Oxygen profile and clogging in vertical flow sand filters for on-site wastewater treatment

Journal of Environmental Management
A PetitjeanC Boutin

Abstract

13 million people (about 20% of the population) use on-site wastewater treatment in France. Buried vertical sand filters are often built, especially when the soil permeability is not sufficient for septic tank effluent infiltration in undisturbed soil. Clogging is one of the main problems deteriorating the operation of vertical flow filters for wastewater treatment. The extent of clogging is not easily assessed, especially in buried vertical flow sand filters. We suggest examining two possible ways of detecting early clogging: (1) NH4-N/NO3-N outlet concentration ratio, and (2) oxygen measurement within the porous media. Two pilot-scale filters were equipped with probes for oxygen concentration measurements and samples were taken at different depths for pollutant characterization. Influent and effluent grab-samples were taken three times a week. The systems were operated using batch-feeding of septic tank effluent. Qualitative description of oxygen transfer processes under unclogged and clogged conditions is presented. NH4-N outlet concentration appears to be useless for early clogging detection. However, NO3-N outlet concentration and oxygen content allows us to diagnose the early clogging of the system.

References

Jan 16, 2007·The Science of the Total Environment·Alexandra TietzRaimund Haberl
Sep 7, 2007·Water Science and Technology : a Journal of the International Association on Water Pollution Research·R WoźniakA Welker

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Citations

Oct 12, 2020·The Science of the Total Environment·Siqi ChenJiajie He
May 26, 2021·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Ying-Hua LiDe-Ze Liu
Nov 15, 2021·The Science of the Total Environment·Ania MorvannouNicolas Forquet

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