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Communication Dans Un Congrès Année : 2008

Fate of European priority substances and emerging compounds along conventional wastewater treatment

Comportement de substances prioritaires et émergentes au sein de procédés de traitement des eaux usées des collectivités

Résumé

n 2006, the AMPERE project was launched to evaluate the fate of priority and other emerging contaminants along wastewater treatment, assess its impact concerning the European Water Framework directive and determine the removal efficiencies of different wastewater treatment technologies. A group of 65 substances were monitored along seven activated sludge wastewater treatment plants (WWTP). Among the targeted compounds: PAHs, organochlorinated and organophosphorated pesticides, herbicides, plasticisers, 9 halophenols including pentachlorophenol, two antibiotics, chlorinated solvents and other VOCs, C10-C14 chloroalkanes and eleven PBDEs. Treatment plants under study were chosen to represent a wide range of treatment lines in both wastewater and sludge, influent characteristics, population equivalents and sewer systems. Wastewater samples were filtrated before analysis to allow separated determination of pollutants in liquid and particulate (suspended solids) phases. Analysis of sludge samples was performed after freeze-drying and grinding. Twenty-two of the 65 substances monitored were detected at least once in the liquid fraction of raw and 19 in treated wastewaters. Plasticizer DEHP; antibiotics sulfamethoxaxole and roxythromicine; trichloromethane and herbicides atrazine and diuron were detected in every wastewater analyzed (dissolved phase). The highest levels detected correspond to DEHP, four VOCs (trichloromethane, dichloromethane, tetrachloroethene and trichloroethene) and that were detected above one microgram per liter in both raw and treated water. No heavy PAHs, chloroalkanes, PBDEs, were ever detected in the soluble phase in wastewater probably due to their lypophilic character. However they were sometimes found in the particulate phase. Heavier PBDEs and PAHs were found as expected in the sludge samples. More polar compounds such as 4,4-DDT, aldrin, isodrin, endrin and alachlor were not detected nor in wastewater neither in sludge. Most frequently detected compounds in sludge were DEHP, decabromodiphenylether, benzo(a) pyrene, fluoranthene, naphthalene, benzothiazole, diuron and both antibiotics. Levels close to the microgram per gram of sludge were sometimes observed for the PAHs, decabromodiphenylether, benzothiazole and 4-t-butylphenol. DEHP concentrations were from few to over a hundred microgram per gram. Isoproturon, simazine frequently present at high concentrations in the liquid, were never detected in the solid phases. Diuron, sulfamethoxazole and roxytromicine were detected in the sludge samples but levels were much lower than those present in the dissolved phase. More data is necessary to be able to draw conclusions regarding fate and treatability of the substances. However, tendencies can be observed by comparing influent and effluent concentrations. After treatment, disappearance or strong reduction of concent rations are observed for most of the pollutants. The observed reduction in the level of VOCs is probably due to volatilization. Lypophilic compounds enter the plant linked to the particulate matter and end up in the sludge line; even if levels are reduced, most of them are still present in final sludge. Isoproturon, chlorpyriphos ethyl, DEHP and sulfamethoxazole are reduced but significant levels are still found in the final effluent. Similar levels were observed in raw influents and final effluents for compounds such as atrazine, simazine, diuron and roxytromicine. Only three compounds have been detected in wastewater effluents above their environmental quality standards (EQS). These include DEHP (even after blank substraction), diuron, and chlorpyriphos ethyl. Diuron showed the highest ratio between its outlet and EQS level (x7). Therefore a dilution ratio of 10 between the effluent and the receiving water is required to bring it below its EQS of 0.2 μg/L. The AMPERE project is co-financed by the French National Research Agency (ANR) and R+i Alliance.
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Dates et versions

hal-02594988 , version 1 (15-05-2020)

Identifiants

Citer

M. Esperanza, S. Martin Ruel, J.M. Choubert, I. Valor, H. Nispel, et al.. Fate of European priority substances and emerging compounds along conventional wastewater treatment. IWA World water congress, Sep 2008, Vienne, Austria. pp.1. ⟨hal-02594988⟩

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