Reducing the formation of disinfection by-products by pre-ozonation

Chang, Cheng-Nan; Ma, Ying-Shih; Zing, Fang-Fong

doi:10.1016/s0045-6535(01)00195-3

Cited by 60 publications

(19 citation statements)

References 19 publications

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“…Preozonation has profound influences on particle stability and TOC (total organic carbon) removal. Although complicated effects of O 3 on organic matter coagulation were widely reported [1][2][3][4][5][6][7], proper mechanisms involved in the influence of ozone in coagulation processes still lagged far behind ozonation utility.…”

Section: Introductionmentioning

confidence: 99%

Interaction of ozone and organic matter in coagulation with inorganic polymer flocculant-PACl: Role of organic components

2009

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a b s t r a c t a r t i c l e i n f oIn this study, two model waters were used to evaluate the ozone effect on aquatic organic matter (AOM) removal by coagulation with inorganic polymer flocculant (IPF)-polyaluminum chloride (PACl). Flocs formation during coagulation processes were detected by using PDA (Photometric Dispersion Analyzer). Apparent molecular weight distribution (AMWD) and resin fractionation (RF) were also performed to characterize the change of AOM as a result of pre-ozonation. The experimental results show that the dosage of O 3 , characteristics and composition of AOM are the most important factors on the behavior of coagulation. Great differences have been found between the two model waters. Coagulation in model water 1 (MW1) (composed of humic acids) is impaired markedly by pre-ozonation, as more DOC (Dissolved Organic Carbon) is produced with increasing O 3 dosage. Floc formation, as exhibited from decreasing of the slopes of FI (Flocculation Index), is retarded gradually during coagulation process. Although residual turbidity is reduced with 1.15 mg/L O 3 , removals of DOC and UV 254 all decreased. As for model water 2 (MW2) (composed of salicylic acid), FI is retarded also, but turbidity and DOC removals of coagulation after pre-ozonation are improved to a certain extent. Coagulation performance judged from removal of DOC is improved distinctly by pre-ozonation. Fractionation results show that molecular weight of organic matter (OM) of MW1 is converted from higher to lower; and OM becomes from more hydrophobic to more hydrophilic, which might be one of the mechanisms involved in the impairment of ozonation on coagulation effect. OM in MW2 is oxidized and mineralized to a greater extent, thus its impairment on coagulation is released. Finally, according to water properties, some proposed applications were provided for application of ozone in water treatment process.

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Section: Introductionmentioning

confidence: 99%

Interaction of ozone and organic matter in coagulation with inorganic polymer flocculant-PACl: Role of organic components

2009

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“…4 shows that at low O 3 dose (1 mg/L), the THM4 formation was reduced from 288.5 to 216.8 μg/L under the subsequent chlorination; thereafter a gradual increase in THM4 was observed as the ozone dose further increased to 3 and 5 mg/L. Previous studies showed that ozonation with a low dose could break the aromatic rings and double bonds of DOM (Chang et al, 2002;Imai et al, 2009), thus reducing the THM4 formation to some extent. However, ozonation with a high dose may give rise to new organic precursors (e.g., methyl-ketone-like structures) from DOM to produce more THM4 during the subsequent disinfection process (Richardson et al, 1999;von Gunten, 2003).…”

Section: Formation Of I-thms and Hacamsmentioning

confidence: 86%

Formation and speciation of disinfection byproducts during chlor(am)ination of aquarium seawater

Zhang

Dong

Adams

et al. 2015

Journal of Environmental Sciences

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“…Surface water contains NOMs, which cause color, turbidity, and THMs formation after disinfection process using chlorine. NOMs were reported to be effectively removed by ozonation and usually evaluated by using DOC [11,12]. As seen in Figure 2, DOC removal was very low with efficiency of 2 % at low ozone dose (0.5 mgO 3 /mgDOC) while it reached the highest efficiency of 36 % at ozone dose of 1.5 mgO 3 /mgDOC.…”

Section: Effects Of Ozone Dose Ph and Contact Time On Pre-ozonationmentioning

confidence: 99%

Application of Pre-Ozonation for Removal of Disinfection by- Products Pre-Cursor From Saigon River Water

Loan¹

2018

JST

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This study aimed to apply pre-ozonation for removal of disinfection by-products precursors to reduce the formation of trihalomethanes (THMs) in Saigon river water. The pre-ozonation process was conducted in a lab-scale ozone contactor. The raw water sample was collected from Saigon River at the Hoa Phu pump station in Cu Chi District, Ho Chi Minh City. The suitable condition for pre-ozonation was found. At ozone dose of 1.5 mgO 3 /mgDOC, pH of 8.5, and contact time of 15 minutes, the removal efficiency of turbidity, color, iron, manganese, dissolved organic carbon (DOC), trihalomethanes formation potential (THMFP) were 36 %, 25 %, 56 %, 81 %, 35 %, and 46 %, respectively. These results indicated that the pre-ozonation could reduce DOC concentration and thus resulted in significant mitigation of THMs formation. In comparison with pre-chlorination, THMFP of raw water pretreated by pre-ozonation was lower. Moreover, this study showed that the pre-ozonation was more effective than pre-chlorination in terms of turbidity, color, manganese, and DOC removals.

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Reducing the formation of disinfection by-products by pre-ozonation

Cited by 60 publications

References 19 publications

Interaction of ozone and organic matter in coagulation with inorganic polymer flocculant-PACl: Role of organic components

Interaction of ozone and organic matter in coagulation with inorganic polymer flocculant-PACl: Role of organic components

Formation and speciation of disinfection byproducts during chlor(am)ination of aquarium seawater

Application of Pre-Ozonation for Removal of Disinfection by- Products Pre-Cursor From Saigon River Water

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