Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl.

Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl. Research Abstract Details 

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Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl. Abstract Text:

Hai-Long Liu,Dong-Sheng Wang,Bao-You Shi,Min Wang,Hong-Xiao Tang,

Ozone plays an important role as a disinfectant and oxidant in potable water treatment practice and is increasingly being used as a pre-oxidant before coagulation. The purpose of this study is to obtain insight into the mechanisms that are operative in pre-ozonized coagulation. Effects ofpre-ozonation on organic matter removal during coagulation with IPF-PACl were investigated by using PDA (photometric disperse analysis), apparent molecular weight distribution and chemical fractionation. The dynamic formation of flocs during coagulation process was detected. Changes of aquatic organic matter (AOM) structure resulted from the influence of pre-ozonation were evaluated. Results show that dosage of O3 and characteristics of AOM are two of the major factors influencing the performance of O3 on coagulation. No significant coagulation-aid effect of O3 was observed for all experiments using either AlCl3 or PACl. On the contrary, with the application of pre-ozonation, the coagulation efficiency of AlCl3 was significantly deteriorated, reflected by the retardation of floc formation, and the removal decreases of turbidity, DOC, and UV254. However, if PACl was used instead of AlCl3, the adverse effects of pre-ozonation were mitigated obviously, particularly when the O3 dosage was less than 0.69 (mg O3/mg TOC). The difference between removals of UV254 and DOC indicated that pre-ozonation greatly changed the molecular structure of AOM, but its capability of mineralization was not remarkable. Only 5% or so DOC was removed by pre-ozonation at 0.6-0.8 mg/L alone. Fractionation results showed that the organic products of pre-ozonation exhibited lower molecular weight and more hydrophilicity, which impaired the removal of DOC in the following coagulation process.

Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl. Publishing Authors By Initials

HL Liu,DS Wang,BY Shi,M Wang,HX Tang,

For similar waste management: water purification research abstracts see: waste management: water purification research

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Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of environmental sciences (China)

VOLUME: 18

Page Numbers: 453-8

Journal Abbreviation: J Environ Sci (China)

ISSN: 1001-0742

DAY: 8

MONTH: 02

YEAR: 2006

Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl. Information

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LANGUAGE: eng

NlmUniqueID: 100967627

Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl. Keywords Mesh Terms:

KEYWORDS: Water Purification

MESH TERMS: methods

Chemical & Substance for Abstract: Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl. Information

Substance Name: Ozone

Registry Number: 10028-15-6

Grant and Affiliation Information for Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACl.

AFFILIATION: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

Country: Netherlands

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MEDLINETA: J Environ Sci (China)

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