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Chapter 119 : Biological Treatment of Industrial Wastewater: a Possible Source of Infection

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Biological Treatment of Industrial Wastewater: a Possible Source of Infection, Page 1 of 2

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Abstract:

This chapter summarizes the results of an extensive study of biological treatment plants (BTPs) from 43 paper mills in Sweden. During September and October 2005, each paper mill with a BTP was sampled systematically. High concentrations of , up to 10 CFU /liter, were found in investigated treatment plants. In total, 66% of all investigated paper mills were positive for . The biomass that undergoes sedimentation in secondary ponds is reinoculated into the system by return-loops to stimulate the growth of the microflora. The remaining biomass is dewatered and used as an energy source at the mill and for soil-making outside the plant. As much as 30 tons of biosludge is produced daily and is often mixed with fibrous waste. Conditions for legionella growth in these systems are almost optimal with a temperature of approximately 37°C, available nutrients and iron sources, and massive aeration. In an investigation the authors found that the cooling towers seem to have little impact on the introduction of legionella downstream into BTPs. Other international studies of biological treatment of sewage have detected legionella with PCR but not by culture. A local risk assessment should be done together with the public health authorities to identify risks for spreading legionella by aerosols and to minimize the spread of disease. Maintenance of cooling towers including regular cleaning is also recommended.

Citation: Allestam G, de Jong B, Långmark J. 2006. Biological Treatment of Industrial Wastewater: a Possible Source of Infection, p 493-496. In Cianciotto N, Kwaik Y, Edelstein P, Fields B, Geary D, Harrison T, Joseph C, Ratcliff R, Stout J, Swanson M (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555815660.ch119

Key Concept Ranking

Legionella pneumophila
0.7642857
Legionella
0.47657704
0.7642857
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Figures

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FIGURE 1

Flow chart of a BTP. Big arrows indicate sampling points.

Citation: Allestam G, de Jong B, Långmark J. 2006. Biological Treatment of Industrial Wastewater: a Possible Source of Infection, p 493-496. In Cianciotto N, Kwaik Y, Edelstein P, Fields B, Geary D, Harrison T, Joseph C, Ratcliff R, Stout J, Swanson M (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555815660.ch119
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Image of FIGURE 2
FIGURE 2

Apportioning of legionella concentrations in aeration ponds in BTPs at Swedish paper mills (CFU/liter; = 43).

Citation: Allestam G, de Jong B, Långmark J. 2006. Biological Treatment of Industrial Wastewater: a Possible Source of Infection, p 493-496. In Cianciotto N, Kwaik Y, Edelstein P, Fields B, Geary D, Harrison T, Joseph C, Ratcliff R, Stout J, Swanson M (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555815660.ch119
Permissions and Reprints Request Permissions
Download as Powerpoint

References

/content/book/10.1128/9781555815660.ch119
1. Allestam, G. 2005. Legionella in Biological Treatment Plants. Tillsyns Nytt, Swedish Environmental Preotection Agency. Nr 2. (In Swedish)
2. Medema, G.,, B. Wuilings,, P. Roeleveld, and, D. Van der Kooij. 2004. Risk assessment of Legionella and enteric pathogens in sewage treatment works. Water Sci. Tech. Water Supply 4:125–132.
3. Nhu Nguyen, T. M.,, D. Ilef,., S. Jarraud,, L. Rouil,, C. Campese,, D. Che,, S. Haeghebaert,, F. Ganiayre,, F. Marcel,, J. Etienne, and, J. C. Desenclos. 2006. A community-wide outbreak-of Legionnaires’ disease linked to industrial cooling towers: how far can contaminated aerosols spread? J. Infect. Dis. 193:102111.

Tables

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TABLE 1

Legionella in biological treatment plants at Swedish paper mills

Citation: Allestam G, de Jong B, Långmark J. 2006. Biological Treatment of Industrial Wastewater: a Possible Source of Infection, p 493-496. In Cianciotto N, Kwaik Y, Edelstein P, Fields B, Geary D, Harrison T, Joseph C, Ratcliff R, Stout J, Swanson M (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555815660.ch119

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