| Activated charcoal best medicine against residues |
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 Activated charcoal is best, ozone second best. Today presents the ranking that shows which method is best for removing residues from pharmaceuticals from wastewater. Fish swimming in the treated wastewater may be changes in their hormone system and the liver. It shows the final report of a project operated by the Stockholm Water. The change is due to residues from approximately 1200 active ingredients contained in the medicines we eat, and that end up in treatment plants in the urine. Since plants are not built to take care of them many runs right through. The same study also notes that if the water is purified in an additional step feel fish got to swim in sewage is much better. Best results if the water can pass through activated carbon, when scientists look no effects whatsoever on the fish. But even when ozone is used to oxidize the molecules get good results. Fair-purification rate can be reached at the new activated carbon, "says Berndt Björlenius, development engineer at the Stockholm Water. It can capture the 46 compounds we have fingranskats close to 98 percent. But the treatment effect decreases slightly as the carbon saturation. During the four years he and his colleagues worked on the study of how well the six different treatment processes capable of removing 90 selected drug compounds contained in wastewater. Everything find the most cost-effective and eco-smart technology. Has the help of engineers had ecotoxicologist in Gothenburg and Stockholm. Scientists believe that Sweden should invest in an additional purification step: -We are playing Russian roulette with the environment today, "said Magnus Breitholtz, Associate Professor at the Department of Applied Environmental Science at Stockholm University. -The levels of drugs in Swedish waters are admittedly low, but we still know nothing about how the 100's of products coming out of our waterways can affect aquatic organisms. But when it comes cost the picture differently: -Given that treatment with low doses of ozone supply 90 percent to capture a fifth of the price seems reasonable to proceed with the method, says Berndt Bjorlenius. Today the cost of waste water treatment in Sweden between four and five billion kronor per year. An extra step with lagdosozonering would increase the cost of 1.8 billion. Treatment with activated charcoal would double it. To rank the environmental scientists purification steps. (The score is a combination of the toxicity of wastewater treatment reduces the efficacy compared with only sand filter as the last step of purification): Activated charcoal: 10 points Ozone (5mg/liter): 9 Ozone (15 mg / liter): 8 Bio-film System (MBBR): 3 MembranBioReaktor (MBR): 1 UV light: 0 |
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