What are the different types of inorganic and organic impurities generally present in sewage?

The terms sewage, sewers and sewerage are interlinked with each other. Can yon explain, how?

Fill in the blanks in the following statements using words given in the box.
[Air, hand-pumps, cholera, water, large, ground]
A very _____ number of our people defecate in the open. It may cause _____ pollution and soil pollution. Both the surface water and _____ water get polluted. _____ water is the source for wells, tube wells, and _____. Thus, it becomes the most common route for _____ borne diseases like _____, dysentery, etc.

Describe various steps of cleaning wastewater in a wastewater treatment plant.

Think and suggest some ways to minimise waste and pollutants at their source, taking your home as an example.