Ozonation followed by coagulation/flocculation and flotation as post-treatment of the effluent from an anaerobic baffled reactor treating domestic sewage

Marchioretto, M.M.; Reali, Marco Antônio Penalva

doi:10.2166/wst.2001.0474

Cited by 14 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[2][3][4] Ozonation of raw water coupled with coagulation improves the removal of turbidity, reduces coagulant requirements, efficiently removes iron and manganese (responsible for the color in distribution water) and increases filter run times. [5,6] Despite these beneficial effects reported in literature for the use of ozone to enhance coagulation and flocculation, there is no comprehensive study on the role of ozone in the re-formation of flocs. This issue is especially important for the treatment of waters containing high level of algae, since ozone reacts with the cells, resulting in a hydrophobic suspension ideal for solid-liquid separation including flotation, where flocs can break when they are subjected to an increased shear during the process flow.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ozone on the Formation and Breakup of Flocs in Raw Waters with High Algae Content

Yükselen

O’Halloran

Gregory

2006

Journal of Environmental Science and Health, Part A

View full text Add to dashboard Cite

The effect of ozone on the formation, breakup and re-formation of flocs generated using ferric sulphate has been investigated using conventional jar test procedure and by continuous optical monitoring using raw water. Using a range of different dosage of coagulant, the breakage of flocs was followed at a high stirring speed, corresponding to average shear rate (G) of about 518 s(-1). Most of the breakage occurred within a few seconds of increasing the shear rate. After breakage the stirring rate was reduced to the original value of 50 rpm (G approximately equals 23 s(-1)) to allow the flocs to re-grow. It was found that only limited re-growth of flocs occurred indicating irreversibility of the floc breakup process. For preozonated samples, the re-growth of flocs occurred to a much greater extent with lower residual turbidity. The findings show that the use of preozonation (1.25 and 1.50 mg/L) provides beneficial results to both improve turbidity removal and reduce coagulant requirement. Furthermore, better re-formation of flocs is achievable.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Ozone on the Formation and Breakup of Flocs in Raw Waters with High Algae Content

Yükselen

O’Halloran

Gregory

2006

Journal of Environmental Science and Health, Part A

View full text Add to dashboard Cite

show abstract

“…Some studies stated ozone is a process which increased biological treatment's efficiency [8,9,10]. Moreover, ozone appropriate as posttreatment in ABR method [11].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Effluent Quality of Anaerobic Baffled Reactor (ABR) With Ozone and Aerobic Activated Sludge for Livestock Wastewater Treatment

Suryawan

Afifah

Apritama

et al. 2021

EPI-IJE

View full text Add to dashboard Cite

ABR used to treat wastewater with high COD level such as livestock wastewater. ABR treatment consists of compartments which are limited by vertical bulkhead growth with attached bacteria. However, ABR treatment only capable degraded COD level by 50 – 53%. This value did not qualify to be discharged into the environment. Therefore, ABR treatment need further treatment with ozone treatment and aerobic activated sludge. There were two treatments in this study, which are ABR with ozone treatment and aerobic activated sludge (S1) and ABR with aerobic activated sludge (S2). COD degradation with ozone treatment showed low efficiency, 31.1 ± 1.5 % but BOD/COD level increased. Aerobic activated sludge with batch system showed efficiency of COD degradation as 95.3 ± 2.2 % (with ozone treatment) and 78.6 ± 4.5 % without ozone treatment. The final concentration effluent for livestock wastewater was 167.7 ± 62 mg/L. Aerobic activated sludge with continuous system was conducted to test that result and it average efficiency only decreased into 85%. This concentration was qualified to be discharged into environment.

show abstract

“…When suitable treatment methods are employed, wastewater can be recycled and reused as sources of water supply and in so doing, this lessens the environmental impact (Marchioretto and Reali, 2001). Choosing the most suitable treatment technique in order to attain optimal reuse of wastewater and nutrients at no or much reduced energy consumption and cost is a major quandary in this context.…”

Section: Introductionmentioning

confidence: 99%

Performance of Sand Channel as Pre-Treatment for Anaerobic Landfill Bioreactor Leachate and Biogas Generation

Olisa¹,

Sapari²,

Malakahmad³

et al. 2015

J. of Environmental Science and Technology

View full text Add to dashboard Cite

The performance of a laboratory scale landfill bioreactor with two compartments (simulated landfill reactor and a sand channel) was investigated in this study. Solid waste components similar to the typical Malaysian waste were collected from the cafeterias in University Teknologi PETRONAS (UTP), Perak, Malaysia and used to generate leachate in the simulated landfill bioreactor. Leachate produced were slowly and systematically introduced into the bottom sand channel where methanogenesis rapidly occurred thereby resulting in a better stabilized system than the simulated landfill reactor. After 20 months of anaerobic incubation of both reactors, it was observed that the Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD 5 ) concentrations were lower in the sand channel while the pH values were higher than the simulated landfill reactor. Reduction in COD and BOD 5 in the sand channel were 88 and 90%, respectively. The pH of the simulated landfill reactor remained acidic at 6.2 while the pH of the sand channel was 7.9. Ammonia-nitrogen (NH 3 -N) concentration was also observed to be lower in the sand channel at 1435 mg LG 1 as against 1509 mg LG 1 in the simulated landfill bioreactor. The constituent methane gas percentage in the simulated landfill reactor and sand channel were 25 and 58%, respectively. The obtained result clearly indicates that the attachment of a sand channel to landfills can be applied for the degradation and reduction of organic pollutants in leachate while methane gas recovered is enhanced.

show abstract

Ozonation followed by coagulation/flocculation and flotation as post-treatment of the effluent from an anaerobic baffled reactor treating domestic sewage

Cited by 14 publications

References 0 publications

Effect of Ozone on the Formation and Breakup of Flocs in Raw Waters with High Algae Content

Effect of Ozone on the Formation and Breakup of Flocs in Raw Waters with High Algae Content

Enhanced Effluent Quality of Anaerobic Baffled Reactor (ABR) With Ozone and Aerobic Activated Sludge for Livestock Wastewater Treatment

Performance of Sand Channel as Pre-Treatment for Anaerobic Landfill Bioreactor Leachate and Biogas Generation

Contact Info

Product

Resources

About