Clearing a Store Room With Battery, CRT and Chemical Waste
A vocational trainee is asked to clear a locked store room before an inspection. The room contains a swollen lithium-ion power bank with a cracked case, a 21-inch CRT television with a broken back cover, a half-full tin of lead-based solder, a squeeze bottle of ferric chloride etchant, and a box of assorted PCB scraps. The workshop has one CO2 extinguisher, no eyewash station, a broken ESD wrist strap, and a single sink that drains to the municipal sewer. The trainee's plan is to cut the power bank cable to discharge it, put the CRT in general waste, pour the ferric chloride down the sink, and keep the solder for future use. The supervisor is away, and the inspection is in two hours.
1. Identify the most serious immediate hazards and give a safe sequence for the two hours.
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The swollen lithium-ion pack is the most serious immediate hazard: it can enter thermal runaway, and cutting or puncturing it can cause a short, fire and toxic fumes. Do not cut, charge or puncture it. Isolate it in a metal container with dry sand or vermiculite, away from combustible material, tape its terminals, and keep it ventilated until an authorized e-waste handler collects it.
The CRT is an implosion and stored-high-voltage hazard. Do not break it or put it in general waste. Keep it intact, wear gloves, carry it with two people and avoid the neck, then label it for authorized CRT recycling.
Ferric chloride is corrosive and toxic to aquatic life; do not pour it down the sink. Keep it in its labelled container with secondary containment. Lead solder is a lead-exposure hazard; keep it out of general waste and wash hands. With two hours, barricade and label the area and arrange collection; do not attempt disposal yourself.
2. Describe the minimum personal protective equipment, spill/first-aid actions, and fire response for these items.
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Minimum PPE: safety glasses, nitrile gloves, apron or lab coat, and closed shoes. No eating or drinking in the area, and ventilate the room.
For ferric chloride on skin, remove contaminated clothing and flush with plenty of water for at least 15 minutes. For eye contact, flush immediately with clean water and get medical help; the missing eyewash station is a reportable safety gap. For lead solder, wash hands before eating and avoid dry brushing that spreads dust.
For a small lithium-ion fire, use sand or vermiculite, or a suitable extinguisher; CO2 may not cool the cells and re-ignition can occur. For a large fire, evacuate and call the fire service. Do not handle a swollen pack with bare hands or carry it in a pocket.
3. Explain the correct environmental disposal and what the trainee should report about the workshop's safety gaps.
Read the worked answer
Batteries, CRTs, PCBs and lead-bearing solder are not municipal waste. They must go to an authorized e-waste recycler with a record or manifest. Ferric chloride must be kept separate and neutralized or precipitated only by trained personnel with waste approval; it must never be discharged to the sewer. The solder should not be kept for general use if it is lead-based and uncontrolled; label it and dispose of it as hazardous waste.
The trainee should report the missing eyewash, the broken ESD wrist strap, the unsuitable single sewer sink and the absence of a spill kit. The inspection area can be made safe by isolating and labelling the items and showing a collection arrangement; illegal dumping would create a bigger hazard and a compliance problem. The supervisor should be informed in writing.