Hyogo Prefecture in Japan softens requirements for industrial water discharges: it is too sterile for fish

Due to the lack of nitrogen and phosphorus in the water, the number of fish decreased.

The authorities of the Japanese prefecture Hyogo temporarily allowed the discharge of industrial waters with a high content of nitrogen and phosphorus in the western part of the country. According to The Mainichi, the reason was too sterile water, in which fish cannot live.

According to the publication, the region has a serious restriction on industrial discharges. In the second half of the 20th century, during the period of economic development, Japanese enterprises carried out dumping with a high content of nitrogen and phosphorus. This caused an increase in the amount of plankton.

After that, requirements were introduced in the region according to which emissions of wastewater with a content of not more than 0.3 milligrams of nitrogen per liter were allowed. According to data in 2016, this figure in factories amounted to about 0.17 milligrams per liter. This caused a decrease in plankton in the water, which led to a decrease in the number of fish and a decrease in catch.

The government plans to appeal to local municipalities and companies for cooperation on softening the quality standards of domestic and industrial water. Monitoring will be carried out by experts and research firms.

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