Microbe removal in secondary effluent by filtration

Zanetti, Franca; Luca, Giovanna De; Sacchetti, Rossella

doi:10.1007/bf03175023

Cited by 16 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a process in wastewater reclamation, direct rapid sand filtration is commonly employed to remove particles and pathogens [3][4][5]. Main advantages of direct rapid sand filtration systems are its simplicity and economical construction, operation, and maintenance using local materials and skills [6,7].…”

Section: Introductionmentioning

confidence: 99%

Impact of loading rate and filter height on the retention factor in the model of total coliform (TC) removal in direct rapid sand filtration

Liu

et al. 2015

Desalination and Water Treatment

View full text Add to dashboard Cite

2015) Impact of loading rate and filter height on the retention factor in the model of total coliform (TC) removal in direct rapid sand filtration, Desalination and Water Treatment, 54:1, 140-146, A B S T R A C TAs a promising technology for wastewater reuse, direct rapid sand filtration has been widely used throughout the world, especially in arid developing and emerging countries. Retention factor describing the equilibrium between retained and mobile total coliform (TC) bacteria plays an important role in the model of TC removal in direct rapid sand filtration. Little attention has been given to the relationship between retention factor and loading rate as well as filter height, two critical parameters impacting retention factor. Therefore, the influence of loading rate as well as filter height on retention factor was discussed. Results showed that retention factor decreased dramatically with loading rate ranging from 9 to 15 m/h, but increased slightly as loading rate ranged from 5 to 9 m/h, which is a little different with the variation of suspended solids and total phosphorus removal efficiency. Retention factor decreased significantly with filter height of 0-30 cm and 120-150 cm, but reduced uniformly with filter height of 30-120 cm. It was deduced that the optimum loading rate and filter height may be 9 m/h and 90-120 cm, respectively. Increasing flocculant could overcome retention factor reduction resulted from higher loading rate or smaller filter height.

show abstract

Section: Introductionmentioning

confidence: 99%

Impact of loading rate and filter height on the retention factor in the model of total coliform (TC) removal in direct rapid sand filtration

Liu

et al. 2015

Desalination and Water Treatment

View full text Add to dashboard Cite

show abstract

“…Therefore in some circumstances effluents of these biological treatment processes may be subjected to additional 'tertiary' treatment to reduce further the levels of enteric viruses (and other pathogens) in the final effluent. Tertiary treatment technologies include sand filtration, ultraviolet and ionising radiation and, more commonly, chemical disinfection with chlorine, ozone or peracetic acid (Taghipour, 2004;Koivunen and Heinonen-Tanski, 2005;Zanetti et al, 2006;De Luca et al, 2008;Chen and Wang, 2012). However, the addition of tertiary processes to a treatment plant inevitably increases capital and operational costs.…”

Section: Introductionmentioning

confidence: 99%

Bacteriophage removal in a full-scale membrane bioreactor (MBR) – Implications for wastewater reuse

et al. 2015

View full text Add to dashboard Cite

The aim of this study was to assess the potential removal efficacy of enteric viruses in a fullscale membrane bioreactor (MBR) wastewater reuse system, using a range of indigenous and 'spiked' bacteriophages (phages) of known size and morphology. Samples were taken each week for three months from nine locations at each treatment stage of the water recycling plant (WRP) and tested for a range of microbiological parameters (n=135). Mean levels of faecal coliforms were reduced to 0.3 CFU/ 100ml in the MBR product and were undetected in samples taken after the chlorination stage. A relatively large reduction (5.3 log) in somatic coliphages was also observed following MBR treatment. However, F-RNA and humanspecific (GB124) phages were less abundant at all stages, and demonstrated log reductions post-MBR of 3.5 and 3.8, respectively. In 'spiking' experiments, free-swimming 'spiked' phages (MS2 and B14) displayed post-MBR log reductions of 2.25 and 2.30, respectively.The removal of these 'free-swimming' phages, which are smaller than the membrane pore size (0.04 µm), also highlights the possible role of the membrane biofilm as an effective additional barrier to virus transmission. The findings from this study of a full-scale MBR

show abstract

“…Secondary effluents generated from anaerobic treatment of domestic sewage are commonly disposed of in water bodies although they may not have ecologically acceptable physical, chemical and/or biological composition. Most often they contain organic matter, nutrients, metals and pathogens, leading to the pollution and contamination of aquatic environments ( Zanetti et al , 2006 ). Usually, the continuous discharge of such effluents is a cause of accelerated eutrophication.…”

Section: Introductionmentioning

confidence: 99%

Microalgae population dynamics in photobioreactors with secondary sewage effluent as culture medium

Marchello¹,

Lombardi²,

Dellamano-Oliveira³

et al. 2015

Braz. J. Microbiol.

View full text Add to dashboard Cite

Nitrogen and phosphorus present in sewage can be used for microalgae growth, possibiliting cost reduction in the production of microalgae at the same time that it decreases the eutrophication potential of the effluent. This research aimed at monitoring the native community of microalgae and coliform bacteria in a secondary effluent from anaerobic municipal sewage treatment. Two treatments (aerated and non-aerated) were performed to grow microalgae under semi-controlled conditions in semi-closed photobioreactors in a greenhouse. The results showed no significant pH and coliforms (total and Escherichia coli ) variation between treatments. Nutrient concentrations were reduced supporting microalgae growth up to 10 7 cells.mL −1 independent of aeration. Exponential growth was obtained from the first day for the non-aerated, but a 5 day lag phase of growth was obtained for the aerated. Chlorella vulgaris was the dominant microalgae (99.9%) in both treatments. In the aerated, 5 algae classes were detected (Chlorophyceae, Cyanophyceae, Chrysophyceae, Bacillariophyceae and Euglenophyceae), with 12 taxa, whereas in the non-aerated, 2 classes were identified (Chlorophyceae and Cyanophyceae), with 5 taxa. We concluded that effluent is viable for microalgae growth, especially Chlorella vulgaris, at the same time that the eutrophication potential and coliforms are decreased, contributing for better quality of the final effluent.

show abstract

Microbe removal in secondary effluent by filtration

Cited by 16 publications

References 29 publications

Impact of loading rate and filter height on the retention factor in the model of total coliform (TC) removal in direct rapid sand filtration

Impact of loading rate and filter height on the retention factor in the model of total coliform (TC) removal in direct rapid sand filtration

Bacteriophage removal in a full-scale membrane bioreactor (MBR) – Implications for wastewater reuse

Microalgae population dynamics in photobioreactors with secondary sewage effluent as culture medium

Contact Info

Product

Resources

About