Advanced Oxidation Treatment of Drinking Water: Part II. Turbidity, Particles and Organics Removal from Lake Huron Water

Rahman, Mokhlesur; Jasim, Saad; Yanful, Ernest K.; Ndiongue, S.; Borikar, Devendra

doi:10.1080/01919512.2010.500900

Cited by 19 publications

(8 citation statements)

References 22 publications

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“…3d). These experiments implied that the ozonation process could effectively oxidize unsaturated organic compounds into saturated compounds and eliminate the UV 254 index (Andreozzi et al, 1999), while its mineralization was limited evidenced by a lower decrease of the DOC index, although some unsaturated compounds had changed into saturated ones (Rahman et al, 2010;Can and Ç akir, 2010), which might cause an increase in genotoxicity due to the formation of toxic oxidation by-products (Stalter et al, 2010). Reungoat et al (2010) investigated the relationship between the removal of micropollutants and biological effects during ozone-activated carbon processes, and found that the mixture of oxidation by-products had less toxic potential than the mixture of parent compounds.…”

Section: Proposal Of Toxicity Assessment Indexmentioning

confidence: 99%

Toxicity-based assessment of the treatment performance of wastewater treatment and reclamation processes

Wei

Tan

2012

Journal of Environmental Sciences

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The reclamation and reuse of wastewater is one of the possible ways to relieve the serious fresh water resource crisis in China. Efficient reclamation treatment technologies ensure the safe reuse of reclaimed water. In order to screen out and evaluate technologies appropriate for reclamation treatment, a great deal of efforts have been brought to bear. In the present study, a toxicity-based method including a Photobacterium phosphoreum test for acute toxicity and SOS/umu test for genotoxicity, accompanied by the traditional physicochemical parameters DOC (dissolved organic carbon) and UV 254 (absorbance at 254 nm), was used to measure the treatment performance of different reclamation processes, including the anaerobic-anoxic-oxic biological process (A 2 O) and subsequent physical/chemical reclamation processes (ultrafiltration, ozonation, chlorination). It was found that for the secondary effluent after the A 2 O process, both the toxicity and physicochemical indices had greatly decreased compared with those of the influent. However, chemical reclamation processes such as ozonation and chlorination could possibly raise toxicity levels again. Fortunately, the toxicity elevation could be avoided by optimizing the ozone dosage and using activated carbon after ozonation. It was noted that by increasing the ozone dosage to 10 mg/L and employing activated carbon with more than 10 min hydraulic retention time, toxicity elevation was controlled. Furthermore, it was shown that pre-ozonation before activated carbon and chlorination played an important role in removing organic compounds and reducing the toxicity formation potential. The toxicity test could serve as a valuable tool to evaluate the performance of reclamation processes.

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Section: Proposal Of Toxicity Assessment Indexmentioning

confidence: 99%

Toxicity-based assessment of the treatment performance of wastewater treatment and reclamation processes

Wei

Tan

2012

Journal of Environmental Sciences

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“…In relation to the presence of organic compounds in the water, a lower concentration (but not very significant) of O 3 was observed in tap water. The presence of organic matter can cause a severe reduction of O 3 in water [42][43][44], due to the rapid action of this agent with the aqueous compounds. However, it is precisely for this reason that O 3 (in its gas form) is widely used in the treatment of wastewater [40,45,46]-for example, reacting with the dirtiness by the direct action of molecular O 3 or by indirect reaction of the radical OH − [32,46].…”

Section: O 3 Stability In Watermentioning

confidence: 99%

Ozonized Water in Microbial Control: Analysis of the Stability, In Vitro Biocidal Potential, and Cytotoxicity

Santos

Silva

Oliveira

et al. 2021

Biology

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O3 dissolved in water (or ozonized water) has been considered a potent antimicrobial agent, and this study aimed to test this through microbiological and in vitro assays. The stability of O3 was accessed following modifications of the physicochemical parameters of water, such as the temperature and pH, with or without buffering. Three concentrations of O3 (0.4, 0.6, and 0.8 ppm) dissolved in water were tested against different microorganisms, and an analysis of the cytotoxic effects was also conducted using the human ear fibroblast cell line (Hfib). Under the physicochemical conditions of 4 °C and pH 5, O3 remained the most stable and concentrated compared to pH 7 and water at 25 °C. Exposure to ozonized water resulted in high mortality rates for Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Enterococcus faecalis, and Candida albicans. Scanning electron micrograph images indicate that the effects on osmotic stability due to cell wall lysis might be one of the killing mechanisms of ozonized water. The biocidal agent was biocompatible and presented no cytotoxic effect against Hfib cells. Therefore, due to its cytocompatibility and biocidal action, ozonized water can be considered a viable alternative for microbial control, being possible, for example, its use in disinfection processes.

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“…Mechanisms by which the ozonation process can influence the coagulation process and consequently improved the water turbidity are as follows [44]:…”

Section: Effect Of the System On Turbidity Reductionmentioning

confidence: 99%

Ozonation of an effluent of oil refineries for COD and sulfide removal

Talei

Mowla

Esmaeilzadeh

2014

Desalination and Water Treatment

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A B S T R A C TWastewater treatment for water reuse is one of the main concerns in oil refineries since it can lead to high economic and environmental benefits. This paper deals with treatment of an effluents of Shiraz oil refinery called Slops reservoirs effluent by means of ozone as an advanced oxidation agent. For this purpose, ozone is well dispersed at a dose of 5 g/h and effective transferred concentration of 2335 mg/L using a gas distributor into a semi-batch reactor containing 1 L of the wastewater. In order to determine the efficiency of the treatment, the removal percentage of COD and sulfide was selected as studying parameters. The effects of initial sulfide and COD concentrations, presence of UV light, initial pH, and temperature were investigated on the studying parameters. According to the obtained results, the highest removal rate occurred during the first 30 min reaction time. Also it has been observed that, for the initial sulfide concentration of 350 mg/L and the initial COD concentration of 975 mg/L, the ozonation process after 45 min resulted in 100% sulfide removal under optimum initial pH of 9.4 and optimum temperature of 15˚C and presence of UV light. While at the same conditions, 92% of COD removal has been achieved for 60 min ozonation. Also, water turbidity level significantly reduced during the treatment.

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Advanced Oxidation Treatment of Drinking Water: Part II. Turbidity, Particles and Organics Removal from Lake Huron Water

Cited by 19 publications

References 22 publications

Toxicity-based assessment of the treatment performance of wastewater treatment and reclamation processes

Toxicity-based assessment of the treatment performance of wastewater treatment and reclamation processes

Ozonized Water in Microbial Control: Analysis of the Stability, In Vitro Biocidal Potential, and Cytotoxicity

Ozonation of an effluent of oil refineries for COD and sulfide removal

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