1.Used water
2.Liquid waste products
3.Pipe carrying sewage
4.Absorbs Ultraviolet rays
5.Used to disinfect water
6.Solid waste extracted in sewage treatment
7.Waste matter discharged from human body
8.Suspended and dissolved impurities in water
9.Trees planted along sewage ponds
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liquid waste products-oils , grease
used to disinfect water -chlorine and chlorine dioxide
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