Advertisements
Advertisements
Question
Explain – Importance of microbes in sewage (water) treatment in cities.
Solution
- In cities, sewage is carried to the processing unit and acted upon by microbial processes.
- Microbes capable of decomposing any compound as well as destroying pathogens like those which cause cholera, typhoid, etc., are mixed with sewage.
- Carbon compounds present in sewage are decomposed and gases like methane and CO2 are released.
- Xenobiotic chemicals present in sewage are decomposed by phenol oxidizing bacteria.
- The sludge that settles down can be used as fertilizer and the water released after microbial treatment can be treated and reused for different purposes, as it is environmentally safe.
APPEARS IN
RELATED QUESTIONS
The process of conversion of sugar into alcohol is called ___________.
Which are the reasons for increasing the popularity of probiotic products?
Complete the following conceptual picture.
What are the benefits of mixing ethanol with petrol and diesel?
Answer the following.
How does the bread become spongy?
Saccharomyces cerevisiae : Ethanol : : Aspergillus oryzae : ________________
Shelf life of yogurt can be increased by pasteurization.
Which fungus is used to make soya sauce by fermentation?
What is added to impart thickness to instant soup?
Give scientific reason.
Bread and other products made using commercial yeast are nutritious.
Write a short note.
Bio-fuels
How is soil pollution controlled by microbes?
Which fuels do we get from microbes?
What is the use of antibiotics to human and other animals?
Explain biofuel production with the help of diagram.
Observe the figure and write the answers to the questions asked.
- Name the above figure.
- What is it used for?
- Which gas is formed in it?
- How is this gas formed?
- What is done with sewage?
Complete the paragraph by selecting the appropriate option in parentheses.
(energy, microbial, erosion-proof, reused, purification, environmentally friendly)
Nowadays, instead of chemical catalysts, _______ enzymes are used in the chemical industry. These enzymes are active at low temperature, pH and pressure; due to which _______ is saved and _______ instruments are also not necessary. Enzymes carry out specific processes; hence unnecessary by-products are not formed due to which expenses on _______ are minimised. In case of microbial enzymatic reactions elimination and decomposition of waste material is avoided and enzymes can be _______ Hence, such enzymes are _______.
Nostoc is used for fixing nitrogen.
The first antibiotic ______ was developed by ______.
Complete the given paragraph by filling the blank spaces from the options given in the bracket:
[oxygen, pyridines, mechanical, CO2, petroleum, fatal, polyester, norcadia]
Spilling of ______ oil occurs in ocean due to various reasons. This oil may prove ______ and toxic to aquatic organisms. It is not easy to remove the oil layer from surface of water by ______ method. However, bacteria like pseudomonas spp. and Alcanovorax borkumensis have to ability to destroy the ______ and other chemicals. Hence, these bacteria are used to clear the oil spills. These are called as hydrocarbonoclastic bacteria (HCB). HCB decompose the hydrocarbons and bring about the reaction of carbon with ______. ______ and water is formed in this process.
