Live data from Hacker News

Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

frontiersin.org

21–29 of 29 posts

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#21
In England and some Commonwealth countries such as Australia and NZ we actually eat the stuff, Vegemite, Marmite, etc—much to the horror of others.

I hope supply damand brought about by this new innovation doesn't result in price hikes for our favourite spreads. :-)

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#22
post #15

Earlier quoted context omitted.

You can as well just bury the microelectronics directly

That just leaves the bulk of the metals as toxic waste in water supplies; the metal compounds from: plating and electroplating industry, batteries, pesticides, mining industry, rayon industry, metal rinse processes, tanning industry, fluidized bed bioreactors, textile industry, metal smelting, petrochemicals, paper manufacturing, and electrolysis applications, etc.

Correct, but you suggest to bury them just same. Given that other components of electronics like plastics are also toxic to water sources, you need to bury them with care in any case and I don't see why separate them in advance.

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#24
post #20

Hands off my marmite!

Vegemite or bust. I once uncovered a ten year old jar of Vegemite (90’s era). It was absolutely amazing. I’m not sure if it matured over time, or if they changed the recipe.

Marmite has an XO version¹, which is aged for a month instead of a couple of days. Not sure I want to try ten year old mitey, but you're here to tell the tale so it must be okay ;)

¹ https://www.marmite.co.uk/products/marmite-xo-yeast-extract-...

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#25
post #24
post #20

Earlier quoted context omitted.

Vegemite or bust. I once uncovered a ten year old jar of Vegemite (90’s era). It was absolutely amazing. I’m not sure if it matured over time, or if they changed the recipe.

Marmite has an XO version¹, which is aged for a month instead of a couple of days. Not sure I want to try ten year old mitey, but you're here to tell the tale so it must be okay ;) ¹ https://www.marmite.co.uk/products/marmite-xo-yeast-extract-...

Why on earth is there a dancing jar of marmite taking up the bottom right sixth of the screen, and how do I get rid of it?

I'm interested in what aging means here. Presumably it is different to just 'having it in a jar in the cupboard' because then all jars are aged in the supermarket for a few weeks or more. Looks like I've got my afternoon wikipedia rabbit hole sorted.

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#26
post #24

Earlier quoted context omitted.

Marmite has an XO version¹, which is aged for a month instead of a couple of days. Not sure I want to try ten year old mitey, but you're here to tell the tale so it must be okay ;) ¹ https://www.marmite.co.uk/products/marmite-xo-yeast-extract-...

Why on earth is there a dancing jar of marmite taking up the bottom right sixth of the screen, and how do I get rid of it? I'm interested in what aging means here. Presumably it is different to just 'having it in a jar in the cupboard' because then all jars are aged in the supermarket for a few weeks or more. Looks like I've got my afternoon wikipedia rabbit hole sorted.

From my experience it dries out rather than age, there's far too much salt in to age.

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#27
post #7

Earlier quoted context omitted.

This is the first time I've seen the use of spent brewers yeast as the biomass for bioaccumulation. However, it falls short of addressing the economic feasibility of extracting the accumulated metals, an essential aspect for practical implementation. The ability of fungi to absorb metals is well-documented, but the real-world application of fungi for purposes such as bioaccumulation and bioremediation is predominantl…

Extracting metals would be a bonus, removing them from wastewater and concentrating them in a mass that can be buried for later processing is boon enough for now. The presence of heavy metals in wastewater has been increasing with the growth of industry and human activities, e.g., plating and electroplating industry, batteries, pesticides, mining industry, rayon industry, metal rinse processes, tanning industry, flui…

I'm involved in two different government-funded bioremediation projects that are exploring the use of fungi to remediate superfund sites. The challenge is not in fungi's ability to accumulate PFAS or heavy metals; it's in doing it cost-effectively over the current methods. As OP pointed out, in most cases, pollution is simply buried in a location that the EPA has designated safe for disposal.

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#28

In England and some Commonwealth countries such as Australia and NZ we actually eat the stuff, Vegemite, Marmite, etc—much to the horror of others. I hope supply damand brought about by this new innovation doesn't result in price hikes for our favourite spreads. :-)

“Yeast extract” gets snuck into a lot of American foods. You just don’t see it as a standalone product much. Marmite goes into plenty of my savory cooking

Re: Spent brewer's yeast as a biosorbent for metal recovery from polymetallic waste

#29
post #23

Any process that I'm aware of that uses yeast for something feeds the yeast, multiplying it and making it stronger. "Waste" brewer's yeast is more accurate, right?

Often there's a point of senescence or "getting old and slow" that can happen with strains.
Post reply on HN