Fill in the blanks:
1. The sewage is carried by big and small pipes called ................................ .
2. Dried sludge is used as a ................................ .
3. Tertiary treatment is a ................................ process.
4. ................................ consists of human excreta and other organic materials.
5. Drains get blocked by ................................ and ................................ .

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Solution

The sewage is carried by big and small pipes called sewer.

Dried sludge is used as a manure.

Tertiary treatment is a chemical process.

Domestic waste water consist of human excreta and other organic materials.

Drains get blocked by sanitary towels and solid food remains.

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