From: here@is.invalid   
      
    Novel sewage treatment system removes up to 70% of nitrogen that   
   would otherwise be discarded into nature   
      
   Brazilian researchers have designed a new low-cost anaerobic reactor   
   that uses a bacterial biofilm on a sheet of polyurethane foam. The   
   goal is to enable more wastewater treatment plants in Brazil to   
   achieve nitrogen removal.   
      
   A new type of biofilm reactor adapted to Brazilian conditions and   
   using polyurethane foam to lower costs can reduce the amount of   
   nitrogen compounds in wastewater by as much as 70%, according to an   
   article in Environmental Technology. The researchers who conducted the   
   study developed a mathematical model to analyze and predict the   
   nitrogen removal mechanism. The biofilm comprised bacteria that   
   converted nitrogen compounds into nitrogen gas, which is   
   environmentally harmless.   
      
   https://www.eurekalert.org/news-releases/957058   
      
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