Destruction of organic pollutants in reusable wastewater using advanced oxidation technology

Yang, Chun; Xu, Yiming; Teo, Khay Chuan; Goh, N. K.; Chia, Lian Sai; Xie, Rongjing

doi:10.1016/j.chemosphere.2004.10.020

Cited by 35 publications

(16 citation statements)

References 7 publications

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“…5d). These experiments implied that pre-ozonation inhibits the formation of toxic disinfection by-products and ensures the low toxicity of effluents, and the combined O 3 -AC process exhibits more advantages, especially for pre-ozonation with a high dose of ozone, such as 10 or 15 mg/L, which was attributed to the decomposition of precursors of disinfection by-products (Yang et al, 2005;Marhaba and Van, 1999).…”

Section: Toxicity Changes During Chlorination Processmentioning

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: Toxicity Changes During Chlorination Processmentioning

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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“…Theoretically, the higher the UV power, the faster is the formation of ·OH radicals. Another possible reason for the long treatment time is the reported recalcitrance of Cu-EDTA complexes to oxidative degradation by ozone/ UV (Yang et al, 2005). Of all complexes with metals (Fe, Al, Pb, Na, Zn) Cu-EDTA had the lowest mineralization rate constant.…”

Section: IIImentioning

confidence: 95%

EDTA Leaching of Cu Contaminated Soils Using Ozone/UV for Treatment and Reuse of Washing Solution in a Closed Loop

Udovič

Leštan

2006

Water Air Soil Pollut

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Ozone and UV irradiation were used for oxidative decomposition of EDTA-Cu complexes in washing solution obtained during multi-step leaching of Cu (344,1±36.5 mg kg −1 ) contaminated vineyard soil with EDTA as a chelant. The released Cu was absorbed from the washing solution on a commercial mixture of metal absorbing minerals, and the treated washing solution then reused for removal of soil residual Cu-EDTA complexes in a closed-loop process. Six consecutive leaching steps (6×2.5 mmol kg −1 of EDTA) removed 38.8 % of Cu from soils, and reduced Cu soil mobility, determined using the toxicity characteristic leaching test (TCLP), by 28.5%. The final washing solution obtained after soil remediation was colourless, with a pH close to neutral (7.5±0.2) and with low concentrations of Cu and EDTA (0.51± 0.22 mg L −1 and 0.083 mM, respectively). The proposed remediation method has therefore potential not just to recycle and save process water, but also not to produce toxic wastewaters. Soil treatment did not substantially alter the soil properties determined by pedological analysis, and had relatively little impact on soil hydraulic conductivity and soil water sorption capacity.

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“…Biological activity such as microbial respiration, chemical activity such as precipitation or pH change, and physical activity such as aeration or high temperature must be kept to a minimum. The length of time that a constituent in wastewater will remain stable was related to the character of the constituent and the preservation method used [25,26].…”

Section: Sample Collectionmentioning

confidence: 99%

“…Total coliforms, fecal coliforms, and E. coli, were analyzed using the method of the Most Probable Number [26].…”

Section: Microbiological Parametersmentioning

confidence: 99%

“…Ecotoxicological testing provides an overall direct estimation of the environmental hazard of effluents, by the exposure of selected test species on the respective samples and the determination of certain end-points, such as lethal effect, growth ability, etc. Therefore, bioassays consist of an attractive and promising alternative and can be performed supplementary to chemical determinations for the assessment of the environmental impact of effluents the corresponding results were variable and depended on both the nature of the test and the aquatic sample characteristics [26][27][28] indicated that the toxic responses of ozonated secondary effluents on the survival and reproduction of Ceriodaphnia dubia were site-specific and presented seasonal variation (ozonation conditions: 1-3 mgL -1 ozone dose for 10 min., followed by 5 min. of residual ozone exposure).…”

Section: Introductionmentioning

confidence: 99%

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Removal of Organic Content and Color from Secondary Treated Wastewater in Reference with Toxic Potential of Ozone During Ozonation

Mani¹

2011

Hydrol Current Res

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Present study was conducted to evaluate the impact of ozonation on the quality improvement of Secondary Treated wastewater at Varanasi, in India. Physico-chemical parameters such as BOD, COD, TOC, UV 254 , color and microbiological parameters such as E. coli, fecal coli. & total coliform disinfection parameters were used to evaluate the efficiency of ozone to upgrade secondary effluent quality. Experimental results revealed that 10 mgL -1 O 3 for 5 minutes exposure duration was found most suitable dose and contact time for the significant reduction of physicochemical parameters of secondary treated wastewater such as BOD, COD, TOC, UV 254 and color i.e. 30%, 14.3% 45% & 60% respectively as well as it enhanced the biodegradability more than 50% in the treated water. Our data also revealed that this applied dose and exposure time is responsible for the highest degradation of microbiological parameters i.e. >98%. Other than this the toxic response of test species was influenced mainly by the dose and exposure time. The acute toxic effect after ozonation was observed on V. fischeri and found that toxic effect of the secondary effluent was decreased after applied dose and exposure duration. Results supported the expectation that the process of Ozone might enhance the overall treatment efficiency of secondary effluent treatment.

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Destruction of organic pollutants in reusable wastewater using advanced oxidation technology

Cited by 35 publications

References 7 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

EDTA Leaching of Cu Contaminated Soils Using Ozone/UV for Treatment and Reuse of Washing Solution in a Closed Loop

Removal of Organic Content and Color from Secondary Treated Wastewater in Reference with Toxic Potential of Ozone During Ozonation

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