Name an industry which can cause both air and thermal pollution and as well as eutrophication.
Chemical fertiliser unit, thermal power plant, refineries, smelting and metallurgical processing units steel mills, and the industries using steam or water as coolant causes both air and thermal pollution. The chemical release form these Industries (if rich in nitrogen and phosphorus) may result in eutrophication.
What is an algal bloom?
The extensive growth of planktonic (free-floating) algae in water bodies due to the presence of organic matter in water (cnitrogen and phosphores) that acts as a food source is called an algal bloom. This imparts a distinct colour to the water bodies.
What do you understand by biomagnification?
Biomagnification refers to the increase in the concentration of the toxic substances at successive trophic level Is in the food chain.
This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted and when this organism is eaten up by another animal of higher trophic level, it is passed on to this and then to the next higher trophic level and so on.
What are the three major kinds or impurities in domestic wastewater?
The three major kinds of impurities in domestic waste water are
(i) Dissolved salts such as nitrates, phosphates, other nutrients, toxic, metal ions and organic compounds.
(ii) Biodegradable organic matter.
(iii) Pathogenic microorganisms.