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...e total coliform, faecal coliform and E. coli analysis wassperformed by the determination of the most probable number (MPN) in multiple tube fermentationstechnique according with the standard methods =-=[13]-=-. For the microbiological determinations in theswastewater, samples were collected before and after the low pressure LP/UV lamps in the fullsscale plants and also in the lab scale experiment with the ...

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...for irrigation of municipal greensspaces and cleaning urban areas. It is important to ensure an wastewater quality of the effluentsdischarged by the wastewater treatment plant (WWTP) for this purpose =-=[1, 2]-=-. The wastewaterstreatment plants (WWTP) based in activated sludge process only can reduce 2 to 4 log insconcentration of pathogens, remaining in the effluent wastewater stream a significant concentra...

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...ps in the organic molecules.sThese results are in agreement with many studiesswhere the formation of new by-products of photocatalytic process with the use of UV lamps duringsthe disinfection process =-=[4, 8, 9]-=-.s3.3 Microbiological removal with UV radiationsMicrobiological analysis of the wastewater after passing through the LP/UV lamp in the full scalesprocess and in the MP/UV lamp in the lab scale reactor...

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...for irrigation of municipal greensspaces and cleaning urban areas. It is important to ensure an wastewater quality of the effluentsdischarged by the wastewater treatment plant (WWTP) for this purpose =-=[1, 2]-=-. The wastewaterstreatment plants (WWTP) based in activated sludge process only can reduce 2 to 4 log insconcentration of pathogens, remaining in the effluent wastewater stream a significant concentra...

Citation Context

...ants (WWTP) based in activated sludge process only can reduce 2 to 4 log insconcentration of pathogens, remaining in the effluent wastewater stream a significant concentrationsof these microorganisms =-=[3]-=-. To prevent the spread of waterborne diseases and also to minimizesthe impact in the living organisms and in human health, regulatory agencies require the destructionsof pathogenic organisms in waste...

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...in the natural streams. Thespresence of dissolved organic compounds not completely removed in the biological treatment canscontribute to reduce the efficiency of the disinfection with this technology =-=[4]-=- or to promote thesformation of by-products of the oxidation process [5-9]. The presence of suspended solids in thessecondary wastewater even in small amounts and the presence of the dissolved organic...

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...ps in the organic molecules.sThese results are in agreement with many studiesswhere the formation of new by-products of photocatalytic process with the use of UV lamps duringsthe disinfection process =-=[4, 8, 9]-=-.s3.3 Microbiological removal with UV radiationsMicrobiological analysis of the wastewater after passing through the LP/UV lamp in the full scalesprocess and in the MP/UV lamp in the lab scale reactor...

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...wastewater must be piped or stored overssignificant distances and time (particularly relevant in the reuse of the effluent wastewater) as regrowth of the microbial population can be considered a risk =-=[11, 12]-=-. However, the disinfection withsthe UV lamps can promote the transformation of the dissolved organic compounds and theseschanges can be measured by the transmittance.s2. Material and methodss2.1 WWTP...

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...stics of the wastewater prior to disinfection. UV light (LP and MP lamps) can besan effective disinfecting agent and leave non toxic residual by the use of chemical reagents suchsas ozone or chlorine =-=[1,7]-=-. This is a disadvantage when wastewater must be piped or stored overssignificant distances and time (particularly relevant in the reuse of the effluent wastewater) as regrowth of the microbial popula...

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...y the UV radiation produced by the lamps. The presence of thessuspended and dissolved solids can shield the contact between the microorganisms and thesradiation and reduce the disinfection efficiency =-=[10]-=-. These dissolved compounds in the wastewatersmatrix absorb the UV light, creating a thin layer that bound the UV lamp and avoiding the directscontact of the radiation with the microorganisms. This st...