Kinetics and mechanism of 17β-estradiol chlorination in a pilot-scale water distribution systems

Liu, Cong; Dong, Feilong; Crittenden, John C.; Luo, Feng; Chen, Xinbo; Zhao, Taotao

doi:10.1016/j.chemosphere.2017.03.039

Cited by 19 publications

(2 citation statements)

References 35 publications

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“…In the same study, Δ9(11)-dehydro-estradiol, a DBP with greater affinity for the estrogen receptor than estrone (E1), was detected, which may act as an endocrine disruptor in the environment [17]. Thus, the decreased estrogenic activity observed herein demonstrates that cleavage or mineralization of the phenolic group, common to all three assessed compounds (BPA, E2, and EE2), is justified due to the facility of the aromatic ring to undergo electrophilic substitutions, making phenol highly susceptible to hydroxyl radical oxidation [2,17,42]. International Journal of Photoenergy photodegradation are displayed in Figure 5.…”

Section: Estrogenic Activity Reductionmentioning

confidence: 80%

Endocrine Disruptor Degradation by UV/Chlorine and the Impact of Their Removal on Estrogenic Activity and Toxicity

Saggioro

Chaves

Felix

et al. 2019

International Journal of Photoenergy

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Recently, chlorination disinfection technology applying ultraviolet radiation (Cl/UV) has received attention as an advanced oxidative process (AOP) for the generation of highly oxidant species. Many studies have evaluated its effects on pathogen inactivation, contaminant removal, and formation of disinfection by-products (DBPs). However, the degradation of three endocrine disruptor chemicals (EDCs), 17β-estradiol (E2), 17α-ethinylestradiol (EE2), and bisphenol-A (BPA), associated with simultaneous disinfection and estrogenic activity and ecotoxicity assessments has not yet been reported. Compound degradation increased with increasing chlorine concentrations (2 mg·L-1 chlorine), with pseudo-first-order kinetics 1.86×10−2 s-1, 3.06×10−2 s-1, and 3.09×10−2 s-1 for BPA, E2, and EE2, respectively. The degradation kinetics in a WWTP effluent significantly decreased to 4.94×10−2 min-1, 4.75×10−2 min-1, and 4.84×10−2 min-1, for BPA, E2, and EE2, respectively. However, 45% TOC removal and disinfection of E. coli and total coliform bacteria (TCB) were observed in 10 min of treatment. The yeast estrogen screen (YES) revealed that the treatment did not form by-products with estrogenic activity, demonstrating cleavage or mineralization in the phenolic group, common to all assessed compounds. High cell growth inhibition and mortality for Raphidocelis subcapitata and Ceriodaphnia dubia, respectively, were observed during the photodegradation process. Thus, the formed DBPs may be responsible for the observed toxicity and should be taken into account in WWTP treatments in order to monitor the formation of chlorinated by-products.

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Section: Estrogenic Activity Reductionmentioning

confidence: 80%

Endocrine Disruptor Degradation by UV/Chlorine and the Impact of Their Removal on Estrogenic Activity and Toxicity

Saggioro

Chaves

Felix

et al. 2019

International Journal of Photoenergy

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“…Apparently, the conventional treatment method-particularly, aeration, coagulation, and flocculation, sedimentation/clarification, filtration, disinfection, and pH adjustment-used presently in drinking water treatment plants in Malaysia is inadequate to eliminate contamination and thus impacts the quality of the drinking water supply. Reductions in the concentrations of steroid hormones and plasticizers (approximately 95-100%) by means of common disinfection means such as chlorination and chloramination suggests the efficiency of using disinfectants in the drinking water distribution system [39][40][41][42] . However, this process was observed in correlation with an increase in the generation of potential carcinogenic disinfection by-products, including trihalomethanes and halogenated acetic acids.…”

Section: Human Health Riskmentioning

confidence: 99%

Occurrence of multiclass endocrine disrupting compounds in a drinking water supply system and associated risks

Wee

Aris

Yusoff

et al. 2020

Sci Rep

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Contamination by endocrine disrupting compounds (EDCs) concerns the security and sustainability of a drinking water supply system and human exposure via water consumption. This study analyzed the selected EDCs in source (river water, n = 10) and supply (tap water, n = 155) points and the associated risks. A total of 14 multiclass EDCs was detected in the drinking water supply system in Malaysia. Triclosan (an antimicrobial agent) and 4-octylphenol (a plasticizer) were only detected in the tap water (up to 9.74 and 0.44 ng/L, respectively). Meanwhile, chloramphenicol and 4-nonylphenol in the system were below the method detection limits. Bisphenol A was observed to be highest in tap water at 66.40 ng/L (detection: 100%; median concentration: 0.28 ng/L). There was a significant difference in triclosan contamination between the river and tap water (p < 0.001). Overall, the life groups were estimated at no possible risk of EDCs (risk quotient < 1). Nonetheless, the results concern the transport and impact of EDCs on the drinking water supply system regarding treatment sustainability and water security. Further exploration of smart monitoring and management using Big Data and Internet of Things and the need to invent rapid, robust, sensitive, and efficient sensors is warranted.

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The use of peracetic acid for estrogen removal from urban wastewaters: E2 as a case study

Maurício

Jorge

Dias

et al. 2020

Environ Monit Assess

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Kinetics and mechanism of 17β-estradiol chlorination in a pilot-scale water distribution systems

Cited by 19 publications

References 35 publications

Endocrine Disruptor Degradation by UV/Chlorine and the Impact of Their Removal on Estrogenic Activity and Toxicity

Endocrine Disruptor Degradation by UV/Chlorine and the Impact of Their Removal on Estrogenic Activity and Toxicity

Occurrence of multiclass endocrine disrupting compounds in a drinking water supply system and associated risks

The use of peracetic acid for estrogen removal from urban wastewaters: E2 as a case study

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