How to set aerators on a highly polluted river?

Question

River Yamuna (tropical India) gets extremely polluted near my home town- Dissolved oxygen drops to ZERO- killing aqua fauna.

water levels in the river vary hugely- from about 100 ft deep in monsoons to just above 1 ft in dry seaon. highly corrupt and ineffective pollution control authorities unable to rein in the pollution despite drains being provided with effluent treatment systems.

I feel that some mechanical/natural aerators within the river stream - which do not require external energy supply could be a long term - low cost solution.

Any suggestions???

Answer 1

why don't you have some kind of park. where you can have a park with a lot of small ponds. So you can probably start off by having a primary pond which has dirty river water and goes to another pond that has filters to trap plastic and so on. then the next pond will have the same filtering technology so that way after the long process, you will end up with filtered water. The only problem is sludge build up. IF you want a good example, try look at Centennial park Sydney. The start of the flow is the highest and has a lot of filters such gross pollutant traps for plastics and so on. the next pond has less visible trash but still has damaging pollution. the pollution will turn into sludge and clean water will go to the next pond. the same process occurs again and again and when the process is done, you have cleaner water.

this makes a community because there is a park and it acts as a filter. This is the low cost version. the alternative could be having a sewage treatment plant. primary, secondary, and tertiary process included. this is bulky and not appealing to having a community and it's expensive. A park with several ponds might do the trick.