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Choose the right sentences related to the process of removing solids:
Answer variants:
The dried sludge is used as manure so that the organic matter and nutrients are returned to the soil.
In the tank the speed of the water is decreased so that the sand, dirt and pebbles to settle down.
Biogas is used as a fuel and to produce electricity.
This sludge is separated from the water with the help of a Scrapper.
Sentence 1:
Sentence 2:
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