Basics
- Run when full
- Set up a schedule and a rota to collect (But don’t overfill - make sure there’s steam flow)
- Encourage staff to group items together thoughtfully before sterilizing, making sure each autoclave cycle is used to its full potential.
- Place clear visual indicators near the autoclave and prep stations to remind users of the maximum load size, helping prevent underfilled or overloaded runs.
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Check regularly for leaks
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Think carefully to see if the item needs to be autoclaved. Perhaps it only needs to be run through the dishwasher.
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Assess your Protocol First of all, think about your experiments and determine if the item needs to be autoclaved at all. Can a good wash in the hot dishwasher be enough?
- Check if you need the 134°C or perhaps 120°C is sufficient.
- Also, look at your drying times. Most Autoclaves continue to run water (up to 8 gallons/min) during the drying time. If you live in a location where the air is dry, consider shortening the drying cycle to only 5 min.
- Use Eco-Friendly Sterilization Materials
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Switch to biodegradable wraps and pouches made from cellulose or paper
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Use sterilization tape with non-toxic adhesive These materials break down more easily and reduce the environmental burden of autoclave waste.
Turn off or set to Stand-by Mode when not in use
Constant-bleed autoclaves may continue to consume water, but at least it will save energy
A sterilize cycle uses 4+ kWh Standby power is still a lot (2500 W > 60 kWh/d)
Hopefully by combining loads, you can turn off any excess autoclaves. Much more efficient than keeping them on standby.
Be sure all autoclaves have shutdown timers. If it doesn’t have one, talk to your electrician. They can often splice one in.
Go Small. Consider getting a little countertop autoclave. They can use less than 1/50th of the energy!
Maintenance
- Schedule routine check-ups
- Regular servicing keeps autoclaves running efficiently and prevents energy waste due to malfunction or inefficiency.
- Train staff on basic upkeep
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Empower in-house teams to handle minor issues like gasket cleaning or drain checks.
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This reduces downtime and avoids unnecessary service calls.
- Log maintenance activities
- Keep a record of inspections and repairs to track performance and identify recurring issues.
A proactive maintenance strategy extends the life of your autoclaves and ensures they operate at peak eco-efficiency.
Install Water Saving Features
Effluent Cooling
Install a water saving system that regulates the on/off of cold water so that water is only used when hot effluent greater than 60°C (140°F) is released.
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A mixing tank condenses and cools hot waste primarily using previously cooled effluent. Therefore, only a small amount of cold water is added
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90% savings of cooling water
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Saves up to 900,000 gallons per year
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Equipment and installation = $1500-$3000
Vacuum Generation
Install a recirculation system
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Instead of releasing the used water, a recirculating system pumps the water back to vacuum
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The recirculated water can be used to cool condensate from the autoclave
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Net water savings of ~85% water usage
(cooling reservoir (covered with green sticker) stores hot water until it’s cool enough to drain into sewer lines.)
Use Grey Water
- Use grey water (rain water, lake or well water, or waste water from other processes) for once through or tank-based cooling
Recycling and Waste Reduction
- Implement Recycling Programs
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Set up clear recycling stations for autoclave-related waste like paper, glass, and metal instruments
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Partner with waste management services that specialize in healthcare recycling
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Provide simple instructions and achievable recycling goals to engage staff
Monitoring and Carbon Reduction
- Monitor and Reduce Carbon Footprint
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Track autoclave usage, energy, and water consumption regularly
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Use this data to identify inefficiencies and set reduction goals
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Continuous improvement ensures each cycle is more sustainable than the last
- Invest in Renewable Energy
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Consider powering autoclaves with solar, wind, or geothermal energy
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Conduct feasibility studies and explore grants or incentives
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Long-term, this shift drastically cuts carbon emissions and operating costs
Purchasing
- Choose autoclaves with automatic on-off feature
- This allows the autoclave to be turned on at the beginning of the day, and turn itself off overnight and on weekends.
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Do not buy constant-bleed models
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Choose mechanical vacuum systems in lieu of water-jet (venturi) vacuum systems
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Consider purchasing research grade autoclaves (v.s. steam jacketed autoclaves). These newer models used 93% less water and significantly less energy.
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Consider purchasing a Gravity autoclave instead of a Vacuum autoclaves.
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Prioritize energy-efficient design features
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Look for autoclaves with fast start-up times to reduce idle energy use
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Choose models with low standby power draw and programmable energy-saving cycles
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Newer designs often include better insulation, optimized heating elements, and more efficient steam distribution systems—all of which reduce overall energy consumption
- Prioritize water-efficient design features
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Choose autoclaves with adjustable water settings that scale usage based on the load size
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Optimize sterilization cycles to avoid unnecessary water use during drying or idle phases
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Integrate features like spray cooling and steam condensate collection to recover and reuse water within the system
Gravity autoclaves
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Steam in autoclave displaces ambient air and forces the air out of the exhaust valve.
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They are cheaper, fewer parts, simpler, more dependable, lower failure rate and uses less energy.
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Heat and pressurized steam is good for common lab items with no hard to reach places - media, waste, metal utensils and glassware, etc
Vacuum autoclaves
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Vacuum pump removes the ambient air first, then steam is put through
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Good for fabrics, polyethylene items like syringes, pouches with air trapped in them like wrapped surgical instruments.
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The vacuum makes it a more complex and energy intensive piece of equipment.
Resources
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