Secondary sewage treatment is mainly a  from Biology Microbes in Human Welfare Class 12 Nagaland Board
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Microbes in Human Welfare

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Secondary sewage treatment is mainly a 

  • mechanical process

  • chemical process

  • biological process

  • physical process


C.

biological process

In secondary or biologicial treatement of municipal waste rich in sewage, the organic matter is decomposed with the help of microbes. Decomposition of oragnic matter occurs by one of the three methods- water hyacinth pod, trickling filter method and activated sludge method. After decomposition the treated water is sterilized through chlorination.

In secondary or biologicial treatement of municipal waste rich in sewage, the organic matter is decomposed with the help of microbes. Decomposition of oragnic matter occurs by one of the three methods- water hyacinth pod, trickling filter method and activated sludge method. After decomposition the treated water is sterilized through chlorination.

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Give the source of invertase enzyme (sucrase).

Saccharomyces cerevisiae 
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What is brewing ?

Brewing is a complex fermentation process, which involves the production of malt beverages such as beer, ale and stout. Saccharomyces cerevisiae is used for the process of fermentation.
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Which bacterium is responsible for the formation of curd from milk?

Lactobacillus  (Lactic acid bacteria).
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What is the difference between rum and whisky ?

Rum is obtained by the fermention of  sugarcane juice or molasses. It is fermented for a shorter period of time
while
whisky is obtained by fermentation of grains like wheat, corn,barley and rye. The fementation is done for a longer period of time.
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Name one micro-organism which is used in bakery.

Yeast .
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