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

Three statements are provided here which define the terms –

(a) sludge (b) sewage and (c) wastewater. Pick out the correct definition for each of these terms.

(a) The settled solids that are removed in wastewater treatment with a scraper.

(b) Water from kitchen used for washing dishes.

(c) Wastewater released from homes, industries, hospitals and other public buildings.

A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give names for (x), (a) and (b)?

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

Fill in the blanks in the following statements using words given in the box.

air, handpumps, 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 _ handpumps ________. Thus it becomes the most common route for ________ borne diseases like cholera _________, dysentery, etc.