I advocate the proper and SAFE disposal of *ALL* effluent, chemical or not!
Here in Ipswich, Massachusetts, we once considered the construction of a Toxic Waste Disposal Plant. What was proposed was a *marvel* of engineering - rather than some sort of "dumping when no one was looking", it was far more a chemical recovery, chemical conversion operation. Terrible "waste" coming in: refined chemicals going out. Waste (raw material) would be delivered in trucks and automatically loaded into the system - one of the most sophisticated systems I've ever seen. Pure white trucks, washed every day, with all of the wash water recycled through the system. Every possible precaution was taken to control what happened and protect the environment. - Come to think of it, even all the personnel, including office workers, were required to take showers every day, and that "waste water" was introduced into the system.
We were shown photographs of existing plants: they each contained enormous aviaries, mainly birds that were extremely sensitive to pollutants; front lawns planted with carpets of flowers. Anyone who wished to visit these facilities at any time were welcomed - as a method of deciding whether or not the operation conformed to their own procedures.
"Eat off the floor"? Why not? Those floors were cleaner and monitored more closely than our own kitchen dishes.
Also a consideration: tax revenues to the Town would have been significant.
Then the panic began ... and it could only be called a panic. The Town Hall was STORMED by residents with pitchforks and torches, reacting to nothing more than the words "Toxic Waste". I tried to talk coherently with a few of the "Not In My Back Yards", a.k.a. "NIMBY"s.... Absolutely NO success. Logic, coherence, sense, ... everything out of fashion except wide-eyed PANIC.
Of course the NIMBYs won, No contest. Those who submitted the proposal calmly retrieved their blueprints, specification and photographs, politely thanked all who had taken the time to listen and left.
The water supply for the town of Ipswich is mainly supplied by wells, ~ 80% - 90%. A few months after the great panic, SOMEONE (never caught) illegally dumped a 55 gallon drum of Trichloethelene (sp?) and contaminated one of those wells for two or three YEARS.
PLEASE do not think I am advocating tossing any and all sorts of waste around the environment. That is simply NOT the case. At the same time, I am a STRONG believer in evaluating the situation without a PANIC, with the inevitable results; - irrational decisions about toxic waste and how to cope with it.
From what I've been able to piece together, and I by NO MEANS claim to be an expert, the amount of fixer containing dissolved silver from the average, or even more active than the "average", "amateur" darkroom, is far too small to justify any thing like a panic attack.
I've tried to glean information from any and all sources, including the local Fire Department ... I have only one comment: it is ALL a tangled mess.
We would do more to correct any possible problems by making the literature, rules and regulations easier to understand: I've found a great of confusuion and variation about "thresholds" - even among those who are entrusted for enforcement - and that is NOT good.