Recycling your old iPhones… with salmon semen

This story was too weird to pass up:

“Japanese scientists have discovered that salmon semen from industrial fish farms could help to recycle rare earth metals.

Researchers led by Yoshio Takahashi from the University of Tokyo, found that salmon semen, known as milt, can be used in a process to extract certain rare earth elements that are used in products such as catalysts, alloys, magnets, optics, lasers and notably mobile phones.”

Only from Japan: salmon semen can help recycle electronics. Apparently.
Only from Japan: salmon semen can help recycle electronics. Apparently.

Apparently the semen, known as milt, “has the capacity to bind to positively charged ion material” making it a potential replacement for many caustic and dangerous chemicals currently used in the electronics recycling process.

The craziest part about this story is that there is a huge source of material available.

According to the paper, “More than 10,000 tonnes per year of milt from salmon, trout and others have been discarded as industrial wastes from fishery industries in Hokkaido, Japan.”

Again that’s

10,000 TONNES OF SALMON SEMEN.

BC salmon farms only raise about 70,000 tonnes of fish per year. There’s no way that there’s that much milt being used, let alone discarded, in BC. Japan doesn’t farm salmon on any significant scale, certainly not enough to produce that much milt.

This milt must be leftover from Japan’s massive “salmon ranching” aquaculture enhancement projects, which release more than 1 billion Pacific salmon from Hokkaido Island (referred to in this study) each year.

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