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FW: screw machine shops
Based on my experiance in Minnesota:
1. If the solvent used is not inherently hazardous based on flash point or listing, the waste has generally been non hazardous.
The main exceptions being the machining or grinding of leaded steel stock and some molten salt heat treating where you can get barium in the waste. However the high flash solvent can be difficult to deal with as a waste - sometimes it can be managed as a waste oil, sometimes it can be burned as fuel (AQ staff take a generally dim view of burning waste materials here), but many times it is handled by the same facilities as hazardous waste - just with no manifest.
2. No experience with this.
3. chip wringing to remove and preferably recover coolants and oils
2 stage solvent cleaning
filtration or distillation to recycle - distillation work well on oil if the oils can be reused from the still bottoms
From: Vanessa Hinkle
Sent: Friday, January 07, 2000 1:45 PM
Subject: screw machine shops
I seem to have started my own screw machine shop initiative. If anyone can help me with the following questions, I would appreciate it.
1. How likely is it that waste solvent from screw machine shops will be hazardous for metals? Do most machine screw shops assume their waste solvent is hazardous? Do most shops have their waste tested?
2. Has anyone out there had problems with waste "Solvent 142" having a flash point below 142? What might be the reasons for this? Would most generators assume that if it was 142 when they bought it, it would be 142 when they were done with it?
3. What are some P2 opportunities for screw machine shops?
Division of Hazardous Waste Management