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Qualité des eaux usées domestiques produites par les petites collectivités : Application aux agglomérations d’assainissement inférieures à 2 000 Equivalent Habitants

Abstract : Wastewater treatment plants designed to treat pollution loads smaller than 2 000 Population Equivalent (PE) are highly represented in France. Knowledge of mean concentrations, ratios and variation range of chemical parameters used to describe wastewater quality is crucial for ensuring a suited design of treatment facilities to the incoming effluents in these rural contexts. This study defines mean concentrations, ratios and variation range of wastewater characteristic for communities under 2 000 PE in capacity. Analysed parameters are BOD5, COD, TSS, TKN, NH4-N, NGL and TP. The analysis compare the obtained results to data available in the scientific literature. Trends related to treatment plants capacity range and geographical areas (national hydrographical watersheds studied: Artois-Picardie, Adour- Garonne, Loire-Bretagne and Rhin-Meuse) are then analysed and detailed. Data collected and analysed are results of integrated 24-Hours water quality measurements on wastewater quality at the treatment plants entrances. Data were then sorted in order to eliminate aberrant values in the studied concentration series. Calculated average concentrations agree with literature data. Only the Total Phosphorus parameter is an exception, the average value is low compare to previous studies, even recent ones (Deronzier and Choubert, 2004). This is in accordance with the progressive decline in phosphorus concentration since the 1990s. Average concentrations are stable when analysed in 500 PE blocks. Geographicaly, the Rhin-Meuse watershed is the only exception, distinguished by very low mean concentrations along with very high rates of hydraulic loads measured in the treatment facilities. Variations range for each parameter agree with the literature for their lower values, when the higher values are higher than those usually used for wastewater treatment facilities sizing in rural areas. Typical ratios values agree with the literature except for the COD/BOD5 ratio showing a relatively high average value. Organic load analysis shows more than 40 % of measurements relating to under loaded wastewater treatment plants. Hydraulic load analysis shows a majority of these measurements being over loaded, especially in the Rhin-Meuse water basin. Hydraulic overload tends to be higher in plants with a capacity lower than 1 000 PE and lower in the 1 000 to 2 000 PE capacity range.
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https://hal.inrae.fr/hal-03275567
Contributor : Vincent Rappeneau <>
Submitted on : Thursday, July 1, 2021 - 11:50:20 AM
Last modification on : Friday, July 2, 2021 - 3:32:56 AM

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Léa Mercoiret. Qualité des eaux usées domestiques produites par les petites collectivités : Application aux agglomérations d’assainissement inférieures à 2 000 Equivalent Habitants. [Rapport Technique] CEMAGREF; ONEMA; EPNAC. 2020. ⟨hal-03275567⟩

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