Details
| Original language | English |
|---|---|
| Pages (from-to) | 816-823 |
| Number of pages | 8 |
| Journal | Water science and technology |
| Volume | 74 |
| Issue number | 4 |
| Publication status | Published - 2 Jun 2016 |
Abstract
A community-wide outbreak of Legionnaire's disease occurred in Warstein, Germany, in August 2013. The epidemic strain, Legionella pneumophila Serogruppe 1, was isolated from an industrial wastewater stream entering the municipal wastewater treatment plant (WWTP) in Wartein, the WWTP itself, the river Wäster and air/water samples from an industrial cooling system 3 km downstream of the WWTP. The present study investigated the effect of physical-chemical disinfection methods on the reduction of the concentration of Legionella in the biological treatment and in the treated effluent entering the river Wäster. Additionally, to gain insight into the factors that promote the growth of Legionella in biological systems, growth experiments were made with different substrates and temperatures. The dosage rates of silver micro-particles, hydrogen peroxide, chlorine dioxide and ozone and pH stress to the activated sludge were not able to decrease the number of culturable Legionella spp. in the effluent. Nevertheless, the UV treatment of secondary treated effluent reduced Legionella spp. on average by 1.6-3.4 log units. Laboratory-scale experiments and full-scale measurements suggested that the aerobic treatment of warm wastewater (30-35 WC) rich in organic nitrogen (protein) is a possible source of Legionella infection.
Keywords
- Activated sludge, Industrial wastewater, Legionella pneumophila, Legionella spp.
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Environmental Science(all)
- Water Science and Technology
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In: Water science and technology, Vol. 74, No. 4, 02.06.2016, p. 816-823.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Strategies for the reduction of Legionella in biological treatment systems
AU - Nogueira, R.
AU - Utecht, K. U.
AU - Exner, M.
AU - Verstraete, W.
AU - Rosenwinkel, K. H.
N1 - Funding Information: The financial support from Ministerium für Klimaschutz, Umwelt, Landwirtschaft, Natur- und Verbraucherschutz des Landes Nordrhein Westefalen (P 03/13-71 Ar) and the Ruhrverband, (Essen) are acknowledged.
PY - 2016/6/2
Y1 - 2016/6/2
N2 - A community-wide outbreak of Legionnaire's disease occurred in Warstein, Germany, in August 2013. The epidemic strain, Legionella pneumophila Serogruppe 1, was isolated from an industrial wastewater stream entering the municipal wastewater treatment plant (WWTP) in Wartein, the WWTP itself, the river Wäster and air/water samples from an industrial cooling system 3 km downstream of the WWTP. The present study investigated the effect of physical-chemical disinfection methods on the reduction of the concentration of Legionella in the biological treatment and in the treated effluent entering the river Wäster. Additionally, to gain insight into the factors that promote the growth of Legionella in biological systems, growth experiments were made with different substrates and temperatures. The dosage rates of silver micro-particles, hydrogen peroxide, chlorine dioxide and ozone and pH stress to the activated sludge were not able to decrease the number of culturable Legionella spp. in the effluent. Nevertheless, the UV treatment of secondary treated effluent reduced Legionella spp. on average by 1.6-3.4 log units. Laboratory-scale experiments and full-scale measurements suggested that the aerobic treatment of warm wastewater (30-35 WC) rich in organic nitrogen (protein) is a possible source of Legionella infection.
AB - A community-wide outbreak of Legionnaire's disease occurred in Warstein, Germany, in August 2013. The epidemic strain, Legionella pneumophila Serogruppe 1, was isolated from an industrial wastewater stream entering the municipal wastewater treatment plant (WWTP) in Wartein, the WWTP itself, the river Wäster and air/water samples from an industrial cooling system 3 km downstream of the WWTP. The present study investigated the effect of physical-chemical disinfection methods on the reduction of the concentration of Legionella in the biological treatment and in the treated effluent entering the river Wäster. Additionally, to gain insight into the factors that promote the growth of Legionella in biological systems, growth experiments were made with different substrates and temperatures. The dosage rates of silver micro-particles, hydrogen peroxide, chlorine dioxide and ozone and pH stress to the activated sludge were not able to decrease the number of culturable Legionella spp. in the effluent. Nevertheless, the UV treatment of secondary treated effluent reduced Legionella spp. on average by 1.6-3.4 log units. Laboratory-scale experiments and full-scale measurements suggested that the aerobic treatment of warm wastewater (30-35 WC) rich in organic nitrogen (protein) is a possible source of Legionella infection.
KW - Activated sludge
KW - Industrial wastewater
KW - Legionella pneumophila
KW - Legionella spp.
UR - http://www.scopus.com/inward/record.url?scp=84982175099&partnerID=8YFLogxK
U2 - 10.2166/wst.2016.258
DO - 10.2166/wst.2016.258
M3 - Article
C2 - 27533856
AN - SCOPUS:84982175099
VL - 74
SP - 816
EP - 823
JO - Water science and technology
JF - Water science and technology
SN - 0273-1223
IS - 4
ER -