Many pathogenic microbes and large amounts of organic matter are found in sewage. 

Monjur Alahi

Many pathogenic microbes and large amounts of organic matter are found in sewage. 

1. During sewage treatment primary sludge is produced. Define Primary sludge.

2. Compare it with activated sludge.


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Salim Ahmed Kawsar

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1. All solids that settle during primary treatment are called primary sludge.

2. During secondary treatment the effluent is passed into a settling tank where the bacterial ‘floes’ are allowed to sediment. This sediment is called activated sludge.

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