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Design of the Oti Landfill |
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Hello everyone, recently I shared with you my visit to one of Ghana?s largest landfill site. I reported on some features of the landfill but not the design of the landfill site and whether or not, the landfill pollutes the environment - particularly underground and surface water. So I have put together the design of the Oti Landfill located within the Kumasi Metropolitan Assembly in Ghana. Waste collected contains high organic content and other substances which decomposes and produces leachates. These leachates can seep into underground water and contaminate it. Leachates also gets in contact with surface drinking waters and pollute them. To prevent this, one of the objectives of the Oti landfill is to treat the waste such that the leachates cannot contaminate both surface water and ground water. Refuse brought to the landfill is tipped into a cell- the cell is an excavated pit or area of about 3-4 meters deep. The cell inside is coated or lined with a very thick layer of clay. The clay linen should be about a meter thick so that it can prevent seepage of the leachates into the ground water. Afterwards, a geo-membrane (a plastic round material) is place on top of the clay lining to also prevent leachates? seepage. The geo-membrane takes a long time to decompose due to its plastic nature and so, it can prevent leachates seepage for a very long time.
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7 Comments
Thanks to everyone who read the report. Thank you.
Posted 24-07-2016 22:24
Joshua, thanks to your report I could receive a brief image of how the landfill is designed and operated. Thanks for sharing!
Posted 24-07-2016 13:09
I'm sure for now, everyone who read all the reports on the Oti Landfill will have a fair idea on how landfills are designed.
Posted 21-07-2016 17:01
Thanks for writing a follow up on the last one Joshua! Yeah i remember the last report you uploaded and i think i commented several questions there. It's good to hear more about the site and also good to know that the site is well managed with regular check-ups for the nearby environment. Thanks for writing!
Posted 21-07-2016 15:10
Oseluse, there additional details to ne shared. But to the best of my knowledge, there isnt any mechanism to capture mathane. Although, the management told me they are advancing plans to initiate such a system. For an organic dominated landfill, you can imagine the quantity of methane gas ousting from the landfill every day. So Arushi , you're very right. We should try to reduce the quantity of waste going to the landfill.
Posted 18-07-2016 21:14
Thanks for sharing further details of the biggest landfill site you visited. It takes lot of efforts and place to create and maintain landfill so we should try our best to divert waste from landfill and reuse and recycle as much as possible before discarding anything as waste for landfill.
Posted 18-07-2016 18:27
Landfills are one of the most cost-efficient ways of disposing wastes and needs to be properly managed to prevent the pollution of the surrounding environment and the contamination of surface and ground water. Thanks for educating us about the design of the oti landfill site. However you didn't mention if there is a system by which methane generated from decaying organic waste is been converted to energy as it is a potent greenhouse gas which contributes to global warming.
Posted 18-07-2016 15:46