Question

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L.
Very short answer type questions:
1.
What is wastewater?
Ans.
2.
What is algal bloom?
Ans.
3.
Name two inorganic impurities present in sewage.
Ans.
4.
What is a manhole?​

Answer 1

Explanation:

1. Wastewater is any water that has been contaminated by human use. Wastewater is "used water from any combination of domestic, industrial, commercial or agricultural activities, surface runoff or stormwater, and any sewer inflow or sewer infiltration".
2. a rapid growth of microscopic algae or cyanobacteria in water, often resulting in a coloured scum on the surface.
3. Two inorganic impurities present in sewage are nitrates and phosphates.
4. a hole in the street with a lid over it through which somebody can go to look at the pipes, wires, etc. that are underground