A) Sand
B) Gravel
C) Plants
D) All the above
Correct Answer: D
Solution :
India and the European Union collaborated to find a cost-effective technology for treatment of sewage waste for irrigation, especially in rural areas, using natural filters like sand and plants. The technology involves collecting the sewage waste before it reaches the water bodies and then treat it using natural filters like sand, gravel, pebbles and plants to remove the impurities. Under the project, many wetland plant species, such as Canna indica, lemon grass, napier, para grass, typha, water hyacinth, water lettuce and a weed species Agaratum conyzoides, have been identified for purifying the wastewater.
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