Plating operations are a huge headache. They have corrosive plating baths. They have to do some chemical processing on site to neutralize the corrosive chemicals and get them down to a neutral pH.
Some years ago, a plating company in San Jose dumped a plating bath into the sewer system. This was so toxic that it killed the bacteria that reduce organic sludge at the sewerage plant. This knocked the whole plant offline, releasing untreated sewerage into the bay. The lower bay was toxic for a week. It's normally swimmable. San Jose was fined by the EPA. The plating company was heavily fined by San Jose.
It's a good sewerage plant. The output is drinkable, and if you take the tour, you're offered some to drink. Some of the output is used for irrigation. In a severe drought emergency, water could be fed back into the water system. They've never had to do that, but in a big drought a few years ago, things got close to that point.
San Jose, which is more of an industrial city than most people realize, still has plating companies. Here's an inspection report for one of them.[1] This one was releasing too much chromium.
[1] https://19january2017snapshot.epa.gov/www3/region9/water/pre...
Nuclear power plants have secondary and tertiary overflow reservoirs, intended to capture any uncontrolled dangerous outflow if things go wrong.
I wonder if chemical plants have something similar, a way to contain an uncontrolled outflow of toxic stuff if the normal flow of neutralization fails.
BTW this likely means quite a bit of land used up by such a reservoir which is ideally never needed, but must be present.
Yes. In Silicon Valley, if you go to Bedwell Bayfront Park, which is behind Meta/Facebook HQ, there is, on the bay side, a small sewerage treatment plant. There's a fenced concrete-lined pond, usually empty. That is a sewerage overflow containment pond. It's next to a hiking trail, so it's easily visible to the public. That whole park, by the way, is a recycled garbage dump. So is the bay side park behind Google HQ.
Wastewater plants have other ponds and tanks which are part of the process, and they're usually full, with liquid moving in and out, accompanied by stirring, air, and chemical injection. A big empty one is a backup system.
Real engineering.[1]
[1] https://www.epa.gov/sites/default/files/2014-09/documents/la...
> BTW this likely means quite a bit of land used up by such a reservoir which is ideally never needed, but must be present
This is enough to earn chemical plants a spot on a future "BANNED in California 2" article, because it's "clearly" overregulation.
This man wrote this on his smart phone, which uses this process. He wants this problem to happen to other people, not himself.
> He wants this problem to happen to other people…
I think he wants them not to dump the chemicals straight down the sewer?
FWIW, I don't see anywhere that the parent post said that there shouldn't be plating plants in San Jose, just that they are dangerous.
Yes. It's a miserable business. Look at the pictures from the inspection of a plating plant. Everything near the process is corroded and covered with crud. Such plants have to be regulated and inspected, to prevent them from becoming a hazard both to the neighborhood and downstream.
Plants which do chemistry on an industrial scale tend to need their own waste processing, which gets the waste products down to a reasonably neutral form. Regulation is needed to prevent dumping it unprocessed. That's what the EPA really does.