the use of microorganism in every day life: (A) sewage disposal - putre faction processes (b) agricultural - nitification (c) drug industry

sewage disposal and recycling of the water is possible by way of microbes and alum salt combined in a sieve.The cleansed water is sieved off and the alum further purifies it.bacteria breakdown rotten sewage with production of water and hydrogen sulphide and carbondioxide as gases emitted into the air.Nitrogen cycle via bacterial nodules at the roots of plants which converte nirites to nitrates and plant nitrogen that equally go into animal nitrogen and further returns to the soil via decomposing animal bodies keeps the farmer manure system going.

Penicillum notatum was got from aspergillus species of bacteria as the first recorded antibiotics that saved thousands from the bubonic plague.