Question

Radhika was traveling in a train , suddenly train stop near a river . she observed that foul smell was coming from river . then she saw a factory established near the river that is throwing waste In water
a. Write down the contaminants that can be present in the factory wastewater. b. How this waste water affect a river and its surrounding. ​

Answer 1

A. They discharge wastewater with significant levels of metals such as lead, mercury, cadmium and chromium, as well as arsenic, selenium, and nitrogen compounds (nitrates and nitrites).

B. Toxic compounds in the effluent disrupt aquatic ecosystems. When a large amount of biodegradable substances end up in the water, organisms will start to break them down, and they use a lot of dissolved oxygen