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Major grade please help

Major grade please help-example-1
User Lehoang
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Answer: Chlorine

Explanation: The purpose of a wastewater treatment tank system is to receive and treat in-fluent wastewater using physical, chemical, or biological methods. That is, a wastewater treatment tank system is one in which wastewater flows through a system and is treated in some way.

User Seriousgeek
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