No valid database = no limit values = no reason to act
Until today, as described in
the third part of our detection series, we do not have limit values or binding guidelines for microplastic contamination of (waste)water. The discharge of microplastic-contaminated water from municipal or industrial wastewater treatment plants and processes is thus neither regulated nor controlled. Today, industrial producers have no obligation to do anything about microplastic waste in their wastewater. Municipal wastewater treatment plants also do not have to take active action.
Our municipal wastewater treatment plants are a collection basin for microplastics from domestic wastewater, industrial wastewater, surface runoff, stormwater and landfills. Due to their treatment processes, they are on the one hand a barrier against the distribution of microplastics into the water cycle, on the other hand also a significant source for the further distribution of microplastics. The reason lies, among other things, in inadequate purification technologies with regard to microplastics resulting in large quantities of more or less purified wastewater being discharged daily into adjacent streams, rivers or directly into the sea.
Estimates from studies show that
each wastewater treatment plant transports between 93 million and 8.2 billion plastic particles into rivers and oceans annually. Water loads of particles ranged from 86 to 714 per cubic meter, and of fibers from 98 to 1479 per cubic meter.