Shared Flashcard Set

Details

Silver Recovery Program
N/A
18
Physics
Professional
03/31/2013

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Cards

Term
justification for silver recovery program
Definition
dwindling worldwide supply of silver
monetary return
compliance with fed and state pollution laws
Term
bans the replacement of toxic substances in public waterways and SEWER SYSTEMS
Definition
water control act of 1972
Term
requires that AVAILABLE DEVICES must remove toxic substances from waste water
Definition
Resources Conservation/ Hazardous Waste Act of 1976
Term
requires the best available methods be used to remove toxic substances from WASTE WATER
Definition
Clean Water Act of 1984
Term
contains many guidelines affecting film processing and silver recovery methods
requires a PERMIT TO DUMP more than 27 gallons of waste per month in public sewers
SHIPPING MANIFESTS are required
Definition
Resource Conservation and Recovery Act of 1987
Term
operates by having the fixer drain into the top of a plastic bucket, filter through steel wool, and overflow through a tube connected to bottom of the container
Definition
metallic replacement
Term
no operating costs
low initial expense
no moving parts/electricity required
relatively high efficiency rating
Definition
advantages of metallic replacement
Term
not as efficient as other methods
silver recovered is in form of sludge
unit must be replaced each recovery cycle
payments are delayed
Definition
disadvantages of metallic replacement
Term
__% of recoverable silver is removed with metallic replacement
Definition
95
Term
uses electric current to reclaim silver
two types of units used
Definition
electrolytic silver recovery
Term
connected to fixer overflow line from processor replenishment system
once unit recovers silver, fixer is flushed down the drain
Definition
terminal electrolytic
Term
designed to recover silver from used fixer and then recirculate fixer back into processor
Definition
recirculating electrolytic
Term
silver is recovered in form of silver flake, which ____ pure
Definition
92-98%
Term
sludge is only ___ to ___% pure
Definition
30-50
Term
dwell time
fixer pH
amperage
maintenance
Definition
factors affecting silver recovery
Term
time that fixer remains in recovery device
Definition
dwell time
Term
longer the dwell time, ___ the efficiency
Definition
greater
Term
fixer pH must be kept below
Definition
5
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