Porpoises return to Germany’s revived rivers
Plastic garbage floats on the water. Fish appear more dead than alive as they gasp for air on the surface. Horror scenes from all corners of the globe emerge as unfortunate testaments to the world’s polluted waters. Just a few years ago, German river landscapes reflected similarly distressing images. But now, even porpoises close relatives of the dolphin are making a comeback in German waters.
The Elbe River especially, from its source in the Czech Republic to its mouth beyond Hamburg in the North Sea, was considered doomed. Until German reunification in 1990, the German Democratic Republic dumped untreated sewage directly into the river.
“The fish had severe mouth ulcers, called cauliflower ulcers,” biologist Veit Hennig of the University of Hamburg told DW in an interview. Hennig also described the state of the Elbe in the 1980s. “The eels looked awful, the flounder had growths on the surface of their skin.”
How was the river rescued? The closure of many East German factories, the continuous treatment of waste water and the implementation of stricter environmental regulations saved the Elbe, along with other German rivers, Veit Hennig said. Anglers and swimmers are now commonplace on the Elbe, as well as other German waterways. Even the animals, like porpoises, are returning.
“It hasn’t been that long since environmental regulation was nonexistent and humankind took advantage of nature,” said Stephan Kster, who teaches at the Institute jordan retro of Wastewater Management and Water Protection at the Technical University of Hamburg Harburg.
According to Kster, rivers especially fell victim to human carelessness.
“We saw that we can dump anything into the water, and then it’s quickly washed out to sea,” Kster said. “Out of sight, out of mind.”
Today, the researcher said attitudes have changed. “More and more was invested in waste water purification methods and not only mechanical purification but also bio chemically.”
Water purification methods have also b jordan retro een continually refined, said the wastewater specialist. “Now it’s the standard to purge nutrients, to retrieve nitrogen a jordan retro nd to eliminate phosphorous strategically.”
In a water treatment plant, the purification of water follows the ‘big to little’ principle. First, a mechanical cleansing process fishes out items, starting with larger pieces, and gradually decreasing in size. A sandtrap then draws out materials like sand, which could damage the pump. A settling tank ensures that only dissolved substances in the water are present until little helpers like bacteria come along to process the carbon.
While German and European rivers are being revived, rivers in China continue to suffer under heavy pollution. Could European water protection measures be implemented in China? Stephan Kster has maintained research ties with China for several years.
Laws and regulations regarding the protection of rivers do exist in China, he e jordan retro xplained adding that implementation of the rules was poor. Veit Hennig said that even in the case of the Elbe, there’s still work to do when it comes to returning their rivers to their natural state.
“Only the water quality in its true chemical make up has improved. But the structure of the river as a natural habitat has actually worsened,” said Henning, mentioning the continued narrowing of rivers due to construction along their banks. For German and Chinese environmentalists alike, there are still challenges ahead.