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How are aquatic weeds used in controlling water pollution?

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in Energy Management by (679k points)
How are aquatic weeds used in controlling water pollution?

(a) They use as a decorative substances

(b) They use as biological filters

(c) They use as chemicals

(d) They used to upgrade wastewater treatment

I have been asked this question in semester exam.

Question is taken from Control Measures of Water Pollution in section Environmental Pollution of Energy Management

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Right option is (d) They used to upgrade wastewater treatment

To elaborate: Aquatic weeds are used to upgrade wastewater treatment lagoons and treat chemical wastewaters. It can readily absorb, accumulate and concentrate heavy metals such as lead, mercury and cadmium.

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