How did a citizen group called Friends of Arcata Marsh, (2 marks)
Arcata, California, USA, help to improve water quality
of the marshland using Integrated Waste Water Treatment ?
Explain in four steps.
(i) Water is treated by conventional method / sedimentation / (2 marks)
filtration / chlorination
(ii) Water flows to six connected marshes
(iii) The water in marshes is seeded with appropriate plants /
algae / fungi / bacteria
(iv) Which helps to neutralise the pollutants / assimilate the pollutants /
absorb pollutants / Remove heavy metals