Only time I ran into a situation like that was a couple years ago when my sisters and I were cleaning out our mother's house. She saved every bank statement, brokerage statement, phone bill, receipts/manuals for appliance that were long gone, etc. Easily the amount of paper the OP has.Will say never 150 pounds to burn, at least not at one time
Some people do not have the ability to burn in their area.Even in the SF bay area where everything is expensive it's only $11 per bankers box to have a commercial shredder do it. The ones we took in the other day were crammed full, about 30 lbs each.
The AI suggestion to soak it into a pulp would be a ridiculous amount of work for 150 lbs of paper. Typical for AI to confidently produce the worst answer. I usually put people who regurgitate AI on the block list. I'm here for actual human thoughts, not AI slop.
The burn barrel will only take a small amount (compared to 150 lbs) at a time so you don't overwhelm the fire. Paper burns well a sheet at a time but not so well as a thick stack of sheets. 150 lbs is going to take a really long time.
If your wood chipper is a big one that may work but like the burn barrel you'll have to feed in small stacks. It also may not shred it evenly or small enough to be unreadable. Then you will have to collect all the shreddings (from a machine designed spray them) and find a way to dispose of them. A chipper with a throat narrower than the width of the paper will have a harder time feeding the paper.
I think paying to get it shredded is the best option if you can't find a free service that will take that much.
WOW! That is A LOT of paper! I guess it boils down to what you have more of, time or money? $88 does not seem too bad to have that much paper disappear in an instant.Now that we are retired we are cleaning out the office of old notebooks from years of working and teaching, old tax and legal documents, and boxes of papers from her parents' house when we cleaned it out. I fill up a 64-gallon Toter roll around garbage can. It has a 224# capacity, it weights quite a bit stuffed full of paper. Any extra goes in bags. I then have a mobile shredder truck from Ark-La-Tex Document Destruction in Tyler come onsite. They dump the can and shred the contents. If needed I refill the can from the bags. Cost was $88 last visit. Time to do it again.
And who gets to clean all that pulp out of the washing machine when you're done? Enough of a mess when someone leaves a Kleenex in a pocket. Gotta love AI.Another option is to place paper in a washing machine, where the water, tumbling, and spins will break the paper apart, making the writing unreadable.