Question

1. Bacteria can be harmful as well us useful. Explain giving examples
2.Why should the sewage disposal pipes be wider in diameter ? explain.
3. ozone is a toxic gas then why it is used for chemical treatment of water?​

Answer 1

Explanation:

(1) Decay of plants and animals wastes : Bacteria break-down the dead bodies of animals and plants by feeding on them and produce humus which helps to maintain the fertility of soil. ... Escherichia coli bacteria is present in intestines of human and herbivores animals where they help in digestion of food.

Answer 2

Answer:

bioremediation of wastewater that includes aerobic treatment (oxidation ponds, aeration lagoons, aerobic bioreactors, activated sludge, percolating or trickling filters, biological filters, rotating biological contactors, biological removal of nutrients) and anaerobic treatment (anaerobic bioreactors, anaerobic lagoons)