Undisturbed rivers are cleaned by swamps and wet zones along the banks. This can be replicated by diverting sidestreams into lowland areas to create flow through wetlands. This filters, denitrifies and create some loss of nutrients to vegetation.
The method is applied in Denmark in the government policy for improving the coastal water. It is proven but it is difficult to find enough land for it.
If the riverbed is covered with silt and clay means it also decrease the self purification ability of the river. study the self purifying ability and do the necessary channelization will improve the quality of rivers
First is how to protect our ecosystems, and It is important to know the quality of pollutants and their sources. Bioremediation is preferring technique.
Natural filtering might be your answer Dear Fatima. Some filtering takes place when water flows over the ground, such as when muddy water from a plowed field or a construction site flows through grass or weeds on its way to a stream. Some of the mud is filtered out. In addition, some filtering takes place when the water is in lakes or streams, through the actions of plants and bottom-dwelling animals (like freshwater clams and mussels) that take in water, remove nutrients, and put it out again.
I think the Waterharmonica concept (Dutch Initiative) can be the best way to purify the polluted river.
Waterharmonica concept is the Dutch initiative which emphasized the use of low technologies that can make bridge or fills the missing links between the quality of water sources and polluted water sources. It is emphasized the use of natural process “as post treatment ecological engineered” to treat wastewater using low techniques. Therefore Waterharmonica concept can be defined as the embodiment of the ambition to include ecological engineered such as constructed wetland.
Technologies with low or absent energy requirement, easy operation without need highly skilled personnel, easy to construct with local available raw materials, permanent and continuous operation without too much maintenance.
Rgd CHANZI, hamidar
"Preventive measures and natural filtering" may be effective, economic, and natural technique to improve the quality of water of a polluted river.
Dear Fatima Kies,
I am agree with the answers of Henrik Rasmus Andersen and Alaa El Din Mahmoud. However, in polluted eusturine open ecosystem aquatic vegetation (macro-phytes), benthic organisms often reported to be functioning well through the process of bio-accumulation. Aqua-phonics integration often facilitates removal of toxic and unwanted ions therefore help to maintain water quality (often reduce CO2, NH3) but I think it will quite difficult to maintain.
I do not know the solution, but it is a big problem in India. I foresee a big crisis due to scarcity of water and whatever will be available will be very polluted.
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