> dissolved copper You would think that dissolved copper would have some recovery value, given the price of copper. I am reminded of the waste from silver hal

> dissolved copper You would think that dissolved copper would have some recovery value, given the price of copper. I am reminded of the waste from silver halide photographic processing, which at one point was just dumped into rivers (an unfortunate amount went into the Great Lakes); when the price of silver increased, suddenly it became worthwhile to recover the silver rather than let it go down the literal drain.