How the government or organisations clean rivers that are so polluted and spreads so wide?
In: 3
The first step should always be to stop polluting.
After that you need to define what kind of problems (polutants, organic material, fertilizer etc.) the river has and act acordingly. For example if runoff of organic material has caused habitat loss for fish, you might need to do some dredging. This means that you must have a good understanding of the river ecosystem before the polutants changed it.
Sometimes it’s better not to remove the polutants at all. I mentioned dredging before. It can be a useful tool but disturbing the bottom can release sedimented polutants back in to the water.
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