Can throwing trash into lava solve our landfill problem?

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Discussion Overview

The discussion revolves around the idea of disposing of trash in active volcanoes as a potential solution to landfill problems. Participants explore the feasibility, environmental implications, and differences between volcanic disposal and traditional waste incineration methods. The conversation touches on theoretical, conceptual, and practical aspects of waste management.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants propose that throwing trash into a volcano could incinerate waste, but question the potential for toxic emissions from uncontrolled burning.
  • Others argue that the emissions from burning waste in a volcano would likely be more difficult to control than those from a regulated incinerator.
  • A participant raises the idea that if trash is submerged in lava, gases might be trapped within the solidified rock, similar to how trees absorb CO2.
  • Concerns are expressed about the safety and practicality of submerging trash in lava, with questions about how to achieve this and the risks involved.
  • Some participants suggest that using a subduction zone might be a more effective method for waste disposal than a volcano, as it would carry waste deep into the Earth.
  • There is a discussion about the political and economic aspects of landfill issues, particularly in relation to greenhouse gas emissions and resource recovery from waste.

Areas of Agreement / Disagreement

Participants express a range of views, with no consensus on the viability or safety of using volcanoes for waste disposal. The discussion remains unresolved, with competing ideas about the environmental impacts and practicalities of the proposed methods.

Contextual Notes

Limitations include the lack of empirical data on emissions from volcanic waste disposal, the assumptions about the behavior of gases in lava, and the unresolved nature of the safety and logistical challenges involved.

  • #31
Steel melts somewhere around 2700F, and titanium melts around 3000F, so it's not unreasonable to assume that titanium would melt in a container of molten steel if the steel isn't right at the melting point. From some quick googling, temperatures above the melting point of titanium are pretty common in steelmaking.
 
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  • #32
cjl said:
From some quick googling, temperatures above the melting point of titanium are pretty common in steelmaking.
From what I understood, foundries are designed to not get much above the melting point, and that temperature depends on the alloy. But yeah, it's possible. Hence the 'likely' qualifier.
I also wondered how alloying of titanium can change the melting temp, but couldn't find anything - not to mention the movies weren't precise enough about their made-up lore to specify the details of alloy composition.
 
  • #33
Ti-6Al-4V is pretty common, and starts melting about 100F below pure Ti, so the number I used above is probably pretty representative.
 
  • #34
How would you recover energy from it if you just put it into a volcano or subduction zone? Most modern incinerators use it to generate electricity.
 
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  • #35
Not to mention that subduction zones are often underwater and that they move at rates of centimeters per year.

https://en.wikipedia.org/wiki/Subduction

https://www.livescience.com/43220-subduction-zone-definition.html

This would mean burying the trash in the subduction zone manually in order to get it to subduct and realizing that should the zone snap the trash could be sent everywhere via tsunami action.

Here's an article on the subducting of nuclear waste:

https://www.thenakedscientists.com/...ld-nuclear-waste-be-disposed-subduction-zones

I think its time now to close this thread as we have pretty much exhausted all the reasons for why this won't work and is likely an interesting but bad idea for getting rid of our trash.

I'd like to thank everyone for contributing here and now formally close this thread.
 
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