Soooooooooo
It seems that toilets and random dumpsters are the go-to method when it comes to the disposal of the ultra-basified aqueous phase.
The thread seems to ignore the fact that these extractions--mescaline extractions (using benzene derivatives as NPS) generating the the largest quantity of toxic waste byproducts among all commonplace extraction teks (SANS harmalas); in most cases >>>1000ml of xylene/toluene/benzene is consumed in a single extraction; due to the presence of oxidizing agent (in most cases this being sulfuric acid, HCl, NaOH, etc.; however under right conditions even weaker acids/bases such as vinegar and citric acid can change structure of xylene, making it more reactive and changing its chemical properties in unknown ways), the petrochemical alkane/aromatic/mixed hydrocarbon solvent (e.g. hexane/xylene/naphtha) undergoes some fun & spunky & totally unpredictable redox reactions to form a soup of much more reactive (READ: EXPLOSIVE AND TOXIC) byproducts which would cost hundreds of dollars' worth of lab gear/reagents and hours of intense anal-retentive labor (AKA a jungle of really dangerous reactions and fractional distillations and Dean-Stark trappings you really should NOT be doing in your kitchen) to be made back into their original forms AFAIK. Hell, even though a fraction of the NPS used in mescal extraction is used for spice extractions, many standard DMT teks still generate generous amounts of similar such byproducts, especially so if back-salting via FASA is involved (which, as previously mentioned, increases reactivity and decreases utility of petrochemical solvents). Even though many of us re-cycle solvents in new extractions, IME they don't pull nearly as many goodies as fresh solvent does
Long Shart Short, most of our fun-and-spunky psychedelic chemistry recipies generate litres upon litres of degraded solvent (ESPECIALLY SO WITH Mescaline because back-salting in NPS causes changes in structure of solvent === unknown reactivity === difficult, if not impossible, to re-purify safely & efficiently in one's kitchen === swimming pools of spent, degraded, super-toxic, super-carcinogenic, super-caustic, super-deadly, super-explosive/reactive petrochemical solvents left to deal with after the desired product is achieved and isolated, leaving the common man with no safe, legal, anonymous, environmentally-friendly and/or cost-effective methods by which to dispose of said highly toxic spent solvent other than through illicit dumping into the environment.
While I do not condone such activities (and currently have a cess pool of several gallons of spent/degraded xylene and naphtha from past extractions wafting around my backyard shed, collecting dust and taking up space which I do not want to flush down my toilet, nor throw into a random dumpster for fear of solvent contaminating sewage, ground-water, soil etc. via these similar such disposal methods) and advocate proper chemical disposal via private contractors as a means of waste disposal to others, I highly doubt my advice isn't even worth the time it takes to read/write this PSA in the first place. A great deal of clandestine kitchen-chemists I am acquainted with IRL have no moral/ethical concern whatsoever when it comes to haphazardly dumping their spent solvents & >>>14 PH solutions of hydroxide in a local forest, park, swamp or similar such area away from their neighborhood where others seldom traverse; the only folks I know of IRL who take out their trash in the ethical way are graduate-chemists with 24/7 carte-blanche access to the chemistry department's hazardous chemical disposal contractor/company (I have begun negotiations with one of them who seems to be OK regarding helping me safely dispose of spent solvents; things are looking up ATM, and I'm planning which plants I should grow/germinate in the freely liberated space these solvents have stewed about in for far too long).
There is a great big 800-kilogram ape haunting this thread: the specter imposed by the question as to how one should go about disposing of the spent, non-recyclable, non-polar phase of a standard A/B extraction. Hunting-out the services of a licensed hazardous chemical waste disposal company would exponentially increase the chance of being prosecuted for manufacture of a controlled/prohibited substance(s), a great big felony charge in most countries, which may bring with it a myriad of other possible charges as well (depending on what the police find when they raid your place with a search warrant in hand), alongside a spike in the stress level/paranoia of the disposer due to this possibility. Flushing litres of chemical waste down the drain or tossing it into a dumpster is analogous to dumping it into a nearby forest and proceeding to run like hell, praying that no one other than your conscience witnessed the deed; no matter how you try to justify your dirty deeds, so as long as the waste isn't disposed of via a legitimate chemical waste disposal company (which may rat you out to Big Brother, as well as take a good chunk of change out of your wallet for the dirty deed) or otherwise kept in your residence ad infinitum, the cost of your voyages through this sea of psychedelic pseudo-science and clandestine chemistry is a great big disservice to the good Earth--by blowing the doors of perception off their hinges with the power of chemistry, of using toxic reagents to create consciousness-combusting compounds--you are, have, or otherwise in one way or another will, be committing a treacherous act of eco-terrorism against the good of all mankind.
It's been eight long years of exponentially expanding interest in and demand for psychedelic compounds, with most consumers desiring them in quasi-pure form. Eight long years of ever-increasing production of said psychedelic compounds in the kitchens of millions of commoners world-wide, most of whom having no means for safe disposal of the spent solvents which yielded their sacraments; what shall we do about this exponentially expanding environmental travesty? How will we go about safely disposing of the super-toxic byproducts of our beloved 'Teks'?
What Shall we do Now?