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The objective of secondary treatment is the further treatment of the effluent from primary treatment to remove the residual organics and suspended solids. InThe secondary stage uses biological processes to further purify wastewater. Sometimes, these stages are combined into one operation. Primary Treatment. From the Primary Clarifiers, the wastewater flows into large, rectangular tanks called Aeration Basins, where a biological treatment called the “activated 1. Primary Treatment: Primary treatment consists of removing floating and suspended solids by mechanical means. · 2. Secondary Treatment: · 3. Tertiary Treatment:.