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Comment by riversflow

11 hours ago

nah, there is no reason they should be discharging any hexavalent chromium, we have better, less insanely toxic ways of chroming things. trivalent chromium is much less toxic, hexavalent chromium should be banned world-wide.

what's more, i'm not finding a reason that tesla would need hexavalent chromium in battery production, which leads me to speculate that this is waste from one of their other car factories where they presumably have a hexavalent chrome line (it's a cheaper and more robust process than trivalent chrome) and they are mixing/discharging on purpose at the limit at this plant.

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riversflow

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bluGill  11 hours ago

I used to work in a factory that did chrome plating (I didn't work in that area, but since it was the same building), as part of my mandatory training before I was allowed to step foot in the building I had to learn there was a sewage plant just for the output of that line and if I had to dispose of waste water for any reasons I had to make sure I got it into the right system. Our sewage system couldn't treat toilet water, the city system can't treat chrome waste. (my waste disposal was limited to toilet and washing my hands - as you would expect from an engineer, but I still had to know about the system just in case)