• 0 Posts
  • 38 Comments
Joined 2 years ago
cake
Cake day: June 9th, 2023

help-circle




  • Perhaps I’m just not understanding you, but how does composting treated sewage fix the problem of dumping raw sewage into the water before it ever reaches the treatment plant?

    The reason for the dumping of raw sewage is because these cities have older infrastructure which combines wastewater and storm water collection into one system. Heavy rains can increase the flow rate in such systems by as much as ten times their usual rate, which is far too much for treatment plants to handle without massively oversizing them and it also could make them lose the microbiology that treats the wastewater for them. Diverting this sewage directly into the receiving waters actually prevents even worse public health problems from occurring.

    Another problem with what you are proposing is that, while composting can be good enough to get rid of pathogens, it’s not good enough to remove things like pharmaceuticals and heavy metals. Incineration would be a more effective solution, but it requires even higher upfront costs.













  • Live Your Lives@lemmy.worldtoScience Memes@mander.xyzW Earth
    link
    fedilink
    English
    arrow-up
    10
    ·
    edit-2
    1 year ago

    I believe you are looking for hydrostatic equilibrium. There don’t seem to be good answers for this online, but according to Robert Black on this Quora post:

    There isn’t a minimium per se but the generally accepted number for a mass to form into a sphere under its own gravity is 1/10,000th the mass of the Earth or 600 quintillion kg. As for size, it really depends on the composition of the body. The numbers are generally accepted to have a diameter of about 600km for a rocky body.

    A quintillion is 1 x 10 to the 18th and Phobos has a mass of 1.0659 x 10 to the 16th kilograms and a diameter of 22 kilometers.


  • Live Your Lives@lemmy.worldtoScience Memes@mander.xyzHere kitty kitty
    link
    fedilink
    English
    arrow-up
    60
    arrow-down
    1
    ·
    edit-2
    1 year ago

    This meme is making these different disciplines answer questions they were never intended to answer. It’s like complaining that a school principal isn’t out there teaching students: that’s not their role and it would be silly to expect them to do otherwise.

    Philosophers would ask something like, “what is a cat?”

    Metaphysicians would ask something like, “how can we know that the cat truly exists?”

    Theologians would ask something like, “what does the Bible say about cats?”