Comparison of natural estrogen removal efficiency in the conventional activated sludge process and the oxidation ditch process

Hashimoto, Toshikazu; Onda, Kensuke; Nakamura, Yumiko; Tada, Keitarou; Miya, Akiko; Murakami, Takao

doi:10.1016/j.watres.2007.02.029

Cited by 81 publications

(49 citation statements)

References 20 publications

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“…This apparent anomaly in the increase in E1concentration is explained by the biological conversion of E2 to E1 during the treatment process and in the sludge route. This abnormal behaviour has also been observed in previous studies (Nasu et al, 2001;Jurgens et al, 2002;Hashimoto et al, 2007;Ren et al, 2007). This also explains why E1 persist in both the effluent and sludge from the WWTPs.…”

Section: Removal Rates Of Treatment Processessupporting

confidence: 87%

“…Nasu et al (2001) also showed E2 concentrations increasing from raw influent to primary effluent within Japanese STW (before falling during biological treatment), which suggest that perhaps some further deconjugation was still taking place. In another study of the Japanese STW by Hashimoto et al (2007) a removal efficiency of 11-83 % were reported for E1 in conventional activated sludge plant, with E2 removal of up to 86 %. Kanda and Churchley (2008) also reported a removal of 97.8 % and 96.3 % removal for E1 and E2 respectively in a conventional activated sludge plant.…”

Section: Introductionmentioning

confidence: 94%

“…Although these estrogen metabolites are deconjugated by bacteria present in sewage and mixed liquor (Shi et al, 2004;Czajka and Londry, 2006), the deconjugated steroids are however, detected in the effluent at concentrations close to the total expected based on excretion values (Johnson et al, 2000). EE2 has the highest endocrine disrupting potency; it is found at low concentrations and is also recalcitrant to biodegradation (Esperanza et al, 2007;Haiyan et al, 2007;Hashimoto et al, 2007). NP is a transformation product of nonylphenol ethoxylates (NPnEOs) which is used in many industrial and commercial process including textile industry processes, and in cosmetic and detergent manufacture (Birket and Lester, 2003;Chien and Shih, 2007).…”

Section: Introductionmentioning

confidence: 99%

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The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

Ifelebuegu

2011

Int. J. Environ. Sci. Technol.

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AB STRACT: Endocrine disrupting chemicals are discharged into the environment mainly through wastewater treatment processes. There is a need for better understanding of the fate of these compounds in the unit processes of treatment plant to optimise their removal. The fate of oestrone, 17β-estradiol, 17α-ethinyestradiol and nonylphenol in the unit processes of full scale wastewater treatment plants in the UK, including activated sludge plant, oxidation ditch, biofilter and rotating biological contactor were investigated. The overall removal efficiencies of all the compounds ranged from 41 % to 100 %. The removals were predominantly during the secondary biological treatment with the rates of removal related to the nitrification rates and the sludge age. The removal efficiency of the treatment processes were in the order activated sludge > oxidation ditch > biofilter > rotating biological contactors. Activated sludge plant configured for biological nutrient removal showed better removal of the endocrine disrupting chemicals compared to conventional activated sludge plant effluents. Tertiary treatment was also significant in the removal process through solids removal. Overall mechanisms of removal were biodegradation and sorption unto sludge biomass. Phytoremediation was also significant in the removal processes. The endocrine disrupting chemicals persisted in the anaerobic sludge digestion process with percentage removals ranging fro 10-48 %. Sorption of the endocrine disrupting chemicals onto the sludge increased with increasing values for the partitioning coefficients and the organic carbon contents of the sludge.

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Section: Removal Rates Of Treatment Processessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

Ifelebuegu

2011

Int. J. Environ. Sci. Technol.

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“…The same result can be obtained when R, the rate of recycle ratio is increased. Perdrieux and Therien [13] and Hashimoto et al [14] showed that the higher the sludge age the better assimilation of the substrate by the cell and the more the rate of utilization of the stored carbon for energetic requirements.…”

Section: Parametric Study Of Activated Sludge Processmentioning

confidence: 99%

“…Since organic matter is essential for oxidation and denitrification as the electron donor. Tashiro et al [14] showed that it might be difficult to carry out simultaneous carbon-nitrogen removal when the influent is applied to this process.…”

Section: Effect Of Recycle Ratiomentioning

confidence: 99%

Heterogeneous Modeling, Identification and Simulation of Activated Sludge Processes

Mustafa¹,

Ibrahim²,

Elkamel³

et al. 2009

American J. of Environmental Sciences

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Problem statement:The activated sludge system is a complex dynamic process and must account for a large number of reactions between large numbers of components. There is necessity for simulation models which describe the dynamic behavior of the activated sludge process. The application of the models in most treatment plants is limited due to lack of appropriate data acquisition and parameters identification studies. To realize this, an improvement of the operating strategies of Waste-Water Treatment Plants (WWTP) is required. The objectives of this study were to: (i) To build a process model considering mass transfer limitations and simulate an existing plant (Helwan WWTP) and validate the results using data from another existing plant with (Zenine WWTP). (ii) To adjust the model kinetic parameters of the biochemical reactions under the effect of mass transfer conditions to be prepared for simulation purposes. (iii) Study the effect of the operating conditions on the removal efficiency of both substrate and ammonia. Approach: A process model of the process was built considering mass transfer limitations and the three growth processes: Carbon oxidation, nitrification and denitrification. Helwan WWTP was used in order to extract the suitable stoichiometric and kinetic parameters to be used for the simulation. Helwan WWTP was used through the simulation results of the substrate (BOD) and ammonia. Egyptian Zenine WWTP was used for the testing and validation of the process model through predicting the response of substrate. Results: The average error of the removal efficiency in Helwan WWTP reached 3.3% for the substrate and 12.5% for the ammonia while the average error of the removal efficiency in Zenine WWTP of substrate reached 4.6%. The effects of recycle ratio, flow rate and influent substrate concentrations on the removal efficiency of the aeration tank were studied. It was found that the removal efficiency of substrate and ammonia was increased by increasing the recycle ratio, influent substrate concentrations and also increased by decreasing influent flow rates. It was found also that the sludge age increased by increasing the recycle ratio and decreased by decreasing the influent flow rates. Conclusion: The heterogeneous process model was able to describe the characteristics and reflects the real phenomena existing in activated sludge processes.

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2010

Wastewater Microbiology

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Comparison of natural estrogen removal efficiency in the conventional activated sludge process and the oxidation ditch process

Cited by 81 publications

References 20 publications

The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

Heterogeneous Modeling, Identification and Simulation of Activated Sludge Processes

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