Random
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Waste disposal (tests and procedures)
Ok now you got a chemical waste that might contain heavy metals, PCBs, dioxins and other toxic stuff in smaller amounts. So you wanna dispose of it
correctly.
How would one go if you had a few litres of the stuff? I'm not talking about extreme PCB and dioxin contaminatiom but you can never be sure for
example if you are digging for gold out of printed circuit boards.
So how could one dispose of that waste and turn it unto relatively harmless materials like Hg-->HgS
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bfesser
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There are a few existing threads on this subject. Try searching. [edit] Here's a mediocre example: <strong><a
href="viewthread.php?tid=25537">Reduction of Copper (II) Compounds</a></strong>
[Edited on 3.1.14 by bfesser]
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Random
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I already looked for them but still there hasn't been a topic here about disposing safely solutions of unknown waste. Topic you posted is one example
but we would need to make a good procedure by ourselves. I'll try to contribute to this tomorrow.
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bfesser
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Because waste disposal is and always should be application specific. If you have "unknown waste," you're not doing amateur science, you're just being
a lazy and careless fool. You should never end up with completely unknown waste. The neutralization and disposal are dependent on what's in your
waste stream. Figure out what you want to dispose of and search for relevant posts. If you don't find any, post here.
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blogfast25
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Quote: Originally posted by Random  | | Ok now you got a chemical waste that might contain heavy metals, PCBs, dioxins and other toxic stuff in smaller amounts. |
Extremely unlikely to find such incredibly diverse pollutants in one place. Not a 'real world problem'.
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BromicAcid
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Disposal will be cumulative.
First for disposal a TCLP test will be run to determine which metals are present. It will be tagged for those. will also be tagged for corrosive and
flammability if applicable or if it is an oxidizer. PCBs are not going to be the concern when mixed with the rest of those nasties. HOWEVER
dioxins... you would be in a world of hurt. I have seen personally a $10k mistake when someone mistakenly shipped one small container of a dioxin
precursor with a large shipment of hazardous waste and the whole shipment was rejected. Dioxins and dioxin precursors are treated differently than
most all other hazardous waste and as far as I know only one place on the North American continent will take those materials for disposal and the
prices are $$$. Things may have changed in the last 6 years but these types of questions used to make up my livelihood. But aside from the dioxins
this would be pretty standard waste.
As for incredibly diverse pollutants blogfast. That is exactly what I used to make when doing chemistry at home. All of my heavy metals, organics,
things I did not want to dump down the drain went into a 5 gallon bucket open to the air to evaporate. By the end it contained all sorts of heavy
metals and other nasties. Thankfully I was able to dispose of it correctly.
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blogfast25
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| Quote: Originally posted by BromicAcid |
As for incredibly diverse pollutants blogfast. That is exactly what I used to make when doing chemistry at home. All of my heavy metals, organics,
things I did not want to dump down the drain went into a 5 gallon bucket open to the air to evaporate. By the end it contained all sorts of heavy
metals and other nasties. Thankfully I was able to dispose of it correctly. |
For most of us these quantities are so small as to be negligible. And definitely no dioxins or PCBs...
[Edited on 4-1-2014 by blogfast25]
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BromicAcid
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I wasn't saying that anyone would have that exact combination, just an 'incredibly diverse' waste stream.
Just to clarify from above, I mentioned additive waste classifications. So if your liquid was flammable and corrosive and toxic by EPA definition it
might be disposed of as:
Waste flammable liquids, toxic, corrosive, n.o.s., (names of chemicals) 3,6,8 and then with any D-codes for metals, e.g., D009 for mercury or
whatever else is in there.
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bfesser
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Thread Split
4-1-2014 at 08:47 |
Random
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Thanks for the contribution BromicAcid. That's exactly what I was looking for. Also you would be surprised, if you chlorinate phenol to
2,4,5-trichlorophenol, dissolve electronic waste in aqua regia, or produce methylamine hcl in some ways there could be some very toxic chlorinated
compounds present. Dioxins, PCBs and bis(chloromethyl) ether come to my mind.
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AJKOER
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An easy and perhaps safer 'disposal' form of the heterogeneous waste material (better than just dumping for sure) is to employ some of the chemistry
of cement making. The rough idea is to commence the setting/formation of a cement mix and then 'add' some of the preferably dry waste. If the cement
successful sets, the waste may be encased, thereby isolated and perhaps neutralized. This would be hopefully for an extended period of time and more
so if buried high above the water table level.
The advantage of this approach is lower expense than employing a host of target reagents to lower the toxicity level, which may prove only partially
successful and may even make the waste potentially more toxic!
[Edited on 10-1-2014 by AJKOER]
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prof_genius
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If disposing of waste at a hazardous waste plant costs too much, you could fill a glass bottle (1-2.5L), then cover it in concrete to make a block.
Next you should write what's in the block on it with a permanent marker. You can safely store this block in your backyard garage etc. You could also
dig a hole in your backyard, line it with plastic (available in hardware stores to cover floors when painting), place the block and cover. This should
keep it safe. This method is fine for most types of waste but you should consider sending very dangerous waste to a hazardous waste plant.
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Ascaridole
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Proper planning and careful selection of reagents for your reactions should almost eliminate any waste disposal problems. I may use "hazardous" or
"toxic" reagents but I always ensure I have a disposal plan (be it destruction with another reagent to form less hazardous byproducts or arrangements
for waste disposal at a professional facility) before even purchasing the reagents.
If possible I do try my best to recycle solvents but sometimes they end up at the disposal center 
I don't like the evaporation method as proper labeling and monitoring of what you put in to it is necessary. In other words a dilute
oxidizing/reducing solution can become very concentrated with evaporation resulting in some exciting chemistry depending on what you add in next.
At work we have guidelines such as not buying bulk quantities of reagents and and working in small scales to reduce waste. We have other rules that
are pretty obvious like using the least toxic solvent system, etc.
I miss my benzene and carbon tetrachloride....
Ascaridole, the masked bandit of chemistry!
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kecskesajt
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Im just having an ADR can and there is copper,nitrate,nitrite,sulphate,sulphuric acid,ammoniua and etc.Here if you ive dangerous waste YOU get money
cause you are enviroment friendly.But you get only money for big quantities.
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macckone
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Waste categories should be separated where possible.
Most soluble inorganic waste can be precipitated with either
Sodium hydroxide, sodium carbonate or sodium sulfate.
PCBs and dioxins are usually by products.
One good example would be making chloroform
From technical grade acetone.
The amount is probably negligible but TCDD is potent.
A primary source is bleaching paper.
Dioxin disposal is usually accomplished by incineration above 1000C.
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jsc
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EVERYTHING is toxic (except pure water maybe, and even then, drink too much water and you die).
Salt (NaCl) is toxic. After the Second Punic War, the Romans sowed the fields of Carthage with salt. If that isn't military use of a toxic chemical
weapon, I don't know what is.
Hard to find anything more basic than salt. Sulfur, maybe? Its an element. Oh wait, sulfur is toxic too.
If you live in the north, go to the supermarket and check out the de-icing area. 20 pound bags of toxic chemicals that you are invited to pour on your
driveway and sidewalk. Watch trucks go buy with TONS of toxic waste dumping on it road. But thats ok, it's fine to dump 50 million tons of toxic waste
onto roadways because you need to melt ice. A few plants and fish may die. So what? You melted ice!
Do a chemistry experiment in your basement and 1 gram of "toxic" waste is a felony. De-ice a public road and feel free to buy a truck to dump your
waste 5 tons at a time into playgrounds and kindergarten parking lots no problem. It's all context.
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quantumcorespacealchemyst
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recycling
| Quote: Originally posted by macckone | Waste categories should be separated where possible.
Most soluble inorganic waste can be precipitated with either
Sodium hydroxide, sodium carbonate or sodium sulfate.
PCBs and dioxins are usually by products.
One good example would be making chloroform
From technical grade acetone.
The amount is probably negligible but TCDD is potent.
A primary source is bleaching paper.
Dioxin disposal is usually accomplished by incineration above 1000C. |
please let me know more about the formation of 2,3,7,8-Tetrachlorodibenzodioxin in during haloformation. i have seen small amounts of orange/rust
colored precipitate (TCDD being white reportedly) from using technical grade acetone.
regarding the dioxins and/or other compounds, what is the expanded formula/method of their formation and/or what impurities they form from?
regarding chloroform decomposition, (besides letting it sit after acidification) are there electrochemical means , taking into account the salts NaOH
and NaCH3COO?
thanks
[Edited on 17-1-2015 by quantumcorespacealchemyst]
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