An ozone assisted process for treatment of EDC’s in biological sludge

Muz, Melis; Ak, Mümtaz; Komesli, Okan Tarık; Gokcay, Celal F.

doi:10.1016/j.cej.2012.11.134

Cited by 17 publications

(6 citation statements)

References 22 publications

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“…However, operational conditions should be strictly controlled and large amount of AC is required in full-scale plants, making this method expensive [31]. Advanced oxidation processes (AOPs), such as ozonation and non-thermal plasma, have also been studied and proven to achieve good removal of EDCs in wastewater [30,[32][33][34]. However, the effects of oxidation products are still not fully understood, which may delay the wide utilisation of such methods.…”

Section: Introductionmentioning

confidence: 99%

Removal of estrone (E1), 17β-estradiol (E2), and 17α-ethinylestradiol (EE2) from wastewater by liquid–liquid extraction

Fredj

Nobbs

Tizaoui

et al. 2015

Chemical Engineering Journal

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With the recent wide spread concerns of the environmental and public health effects of endocrine disrupting chemicals (EDCs), it is becoming important to develop new techniques to remove these substances from wastewater. EDCs find their way to the environment mainly via effluents from WWTPs. They are often cited as moderately hydrophobic, hence they have tendency to distribute to organic solvents and can then be removed using liquid-liquid extraction (LLE) techniques. However, despite being a mature chemical engineering unit operation, LLE has not been studied for the removal of EDCs in water. This study investigated the removal of three EDCs of concerns including estrone (E1), 17β-estradiol (E2), and 17α-ethinylestradiol (EE2) using decamethylcyclopentasiloxane (D5) as an extraction solvent in three water matrix types (Milli-Q, tap water, and a secondary treated wastewater). The study showed that all three EDCs were distributed to D5 but at varying distribution coefficients: K E1 = 2.66, K E2 = 0.61 and K EE2 = 1.67 ±5% at pH 6 and 20 o C. Due to the high pKa values of the three EDCs, pH had no significant effect on K EDCs up to about pH 9.5 but higher pHs reduced the distribution ratios up to almost zero at pH 12. Van't Hoff Equation described the effect of temperature on K EDCs and showed that the process was endothermic. The overall estrogenic potency of the three EDCs in mixtures was quantified with an E2 equivalent potency, which was found to distribute well into the solvent at a K E2EQ 2 = 1.43. The study suggests that LLE is an effective method to remove estrogenic potency of wastewater.

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Section: Introductionmentioning

confidence: 99%

Removal of estrone (E1), 17β-estradiol (E2), and 17α-ethinylestradiol (EE2) from wastewater by liquid–liquid extraction

Fredj

Nobbs

Tizaoui

et al. 2015

Chemical Engineering Journal

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“…The ozonation of sludge results in the oxidation of TrOCs (Muz et al, 2013;Qiang et al, 2013), although the oxidation rates in sludge (Table 6) tend to be slower than those in pure water (Qiang et al, 2013). This is attributed to the reaction of ozone and radicals with dissolved compounds in sludge (Chu et al, 2009b;Song et al, 2003) and to the sorption of TrOCs on sludge flocs (Qiang et al, 2013).…”

Section: Trace Organic Contaminantsmentioning

confidence: 91%

Holistic sludge management through ozonation: A critical review

Semblante

Hai

Dionysiou

et al. 2017

Journal of Environmental Management

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This paper critically reviews the multidimensional benefits of ozonation in wastewater treatment plants. These benefits include sludge reduction, removal of emerging trace organic contaminants (TrOC) from wastewater and sludge, and resource recovery from sludge. Literature shows that ozonation leads to sludge solubilisation, reducing overall biomass yield. Sludge solubilisation is primarily influenced by ozone dosage, which, in turn, depends on the fraction of ozonated sludge, ozone concentration, and sludge concentration. Additionally, sludge ozonation facilitates the removal of TrOCs from wastewater. On the other hand, by inducing cell lysis, ozonation increases the chemical oxygen demand (COD) and nutrient concentration of the sludge supernatant, which deteriorates effluent quality. This issue can be resolved by implementing resource recovery. Thus far, successful retrieval of phosphorous from ozonated sludge supernatant has been performed. The recovery of phosphorous and other resources from sludge could help offset the operation cost of ozonation, and give greater incentive for wastewater treatment plants to adapt this approach.

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“…The amount of ozone applied was 0.9-1.4 g kg −1 sludge destroyed, some thousand times lower than those reported in the literature, as shown in Table 3. Hence, it is now possible to obtain a more stabilized, phosphorus-rich and disinfected sludge, free from harmful organics, such as EDCs (Muz et al 2013), at super low ozone doses. Compared to standard aerobic digestion, which affects 40-50% solids reduction in 10-15 days (Tchobanoglous et al 2003), the present process is far superior by providing more than 77% MLVSS reduction in just 4 days.…”

Section: Discussionmentioning

confidence: 99%

“…However, ozone-assisted aerobic sludge digestion was found to offer great advantages by simultaneously removing xenobiotics, such as endocrine-disrupting chemicals, from sludge (Muz et al 2013).…”

Section: Phosphorus Release and Appraisal Of The Processmentioning

confidence: 99%