After the conventional sedimentation, filtering and chlorine, lots of dangerous pollutants still remain. To combat this, the biologists developed a series of six connected marshes where appropriate plants, algae, fungi and bacteria were seeded into this area, which
(i) neutralise the pollutants
(ii) absorb the pollutants
(iii) assimilate the pollutants

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(i), (ii) and (iii)

only (iii)

only (i) and (iii)

only (i) and (ii)

answer is A.

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Detailed Solution

Integrated waste water treatment involves conventional sedimentation, filtering and chlorine treatment. Even after this process a lot of dangerous pollutants like dissolved heavy metals still remain. To combat this situation, the biologists developed a series of six connected marshes over 60 hectares of marshland where appropriate plants, algae, fungi and bacteria were seeded which neutralise, absorb and assimilate the pollutants. Hence, as the water flows through the marshes, it gets purified naturally.

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