An experiment using water from a large wastewater treatment plant (WWTP) carried out by the Stream Ecology group has shown that this water continues to affect river diversity and the trophic web (food web) despite being properly treated and highly diluted before discharge. The study, published in the Journal of Environmental Management, shows that the limits currently in place and the procedures used to treat wastewater may not be sufficient to protect the natural properties of food webs
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Source: Phys.org