MSGID: 1:317/3 64acdb24   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Microbial predators cause seasonal fluctuations in wastewater treatment   
      
      
     Date:   
         July 10, 2023   
     Source:   
         University of Cologne   
     Summary:   
         Seasonal temperature fluctuations only have an indirect influence   
         on the bacterial community in wastewater.   
      
      
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   FULL STORY   
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   The community of microbial predators influences the composition   
   of the bacterial community in wastewater. This explains seasonal   
   variations in the microbial community that affect the efficiency of   
   water treatment. This is the result of a study conducted by Nils Heck   
   and PD Dr Kenneth Dumack from the University of Cologne's Institute of   
   Zoology. The study has been published under the title 'Microeukaryotic   
   predators shape the wastewater microbiome' in the journal Water Research.   
      
   In wastewater treatment plants, a precisely coordinated interaction   
   of different microorganisms takes place in order to effectively treat   
   wastewater.   
      
   However, a large part of the microorganisms involved in water treatment is   
   still unknown. In addition to the beneficial bacteria that are responsible   
   for purifying wastewater, many of their predators can also be found in   
   the bioreactors. However, little is known so far about whether and to   
   what extent these predators influence wastewater treatment.   
      
   Since the introduction of wastewater treatment plants, it has been   
   known that the seasons influence the bacterial community in wastewater,   
   and thus also the efficiency of water treatment. But why is this   
   so? After all, bacteria do not possess an inbuilt sense of time. This   
   question is by no means trivial, as seasonal changes are the result of a   
   variety of factors. The best-known factors are certainly temperature and   
   light conditions. However, the chemical composition of the wastewater,   
   precipitation amounts and many other factors also vary with the changes   
   throughout the year.   
      
   So which of these factors causes the bacterial community to change over   
   the seasons? PD Dr Kenneth Dumack, the leader of the study, explained,   
   "We found that seasonal variation in ambient temperature cannot   
   explain the variation in the bacterial community. This surprised us,   
   so we looked for another factor that could explain the variation in   
   the bacterial community." Nils Heck, first author of the study, added,   
   "We found that the community of microbial predators, such as amoebae,   
   ciliates and also rotifers, can explain the composition of the bacterial   
   community to a certain extent. These predators are in turn dependent   
   on the ambient temperature. Thus, the temperature factor represents an   
   indirect influence on the bacteria through the community of predators."   
   The new findings contribute to a better understanding of the so-called   
   'black box' of wastewater treatment in order to avoid, among other things,   
   health risks that can arise from inadequately treated wastewater.   
      
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   Story Source: Materials provided by University_of_Cologne. Note: Content   
   may be edited for style and length.   
      
      
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   Journal Reference:   
      1. Nils Heck, Jule Freudenthal, Kenneth Dumack. Microeukaryotic   
      predators   
         shape the wastewater microbiome. Water Research, 2023; 242: 120293   
         DOI: 10.1016/j.watres.2023.120293   
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   Link to news story:   
   https://www.sciencedaily.com/releases/2023/07/230710113335.htm   
      
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