1.WHAT IS LAB (LACTIC ACID BACTERIA)?
2.WHAT HAPPENS TO PRIMARY AND SECONDARY SLUDGE??

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Solution

Lactic acid bacteria are a group of gram positive bacteria which are generally rod shaped (coccus). They produce lactic acid as a major end product in carbohydrate fermentation. They are found in lactic products and decomposing plants.

The primary and secondary sludge are usually subjected to anaerobic digestion. Methane is obtained as an important by product and the remaining matter can be safely disposed or used in landfills.

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Similar questions

	Primary Sludge	Activated sludge
(i)	It is sludge formed during primary sewage treatment.	It is sludge formed during secondary sewage treatment.
(ii)	It possesses flocs of decomposer microbes.	It does not possess flocs of decomposer microbes.
(iii)	It does not require aeration.	Formation of activated sludge requires aeration.
(iv)	A lot of decomposition occurs during formation of primary sludge.	Very little decomposition occurs during formation of activated sludge.

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