The discharge of chromate ions (CrO42-) to sewers or natural waters is of concern because of both its ecological impacts and effects on human health if the receiving water is used as a drinking water source. One way in which chromate can be removed from solution is by its reaction with ferrous iron (Fe²+) to form a mixture of chromic hydroxide and ferric hydroxide solids [Cr(OH)3(s) and Fe(OH)3(s), respectively], which can then be filtered out of the water. The overall reaction can be represented as CrO4 + 3Fe2+ +8H₂O → Cr(OH)3(s) + Fe(OH)3(s) + 4H+ How much particulate matter would be generated daily by this process at a facility that treats 60 m³/h of a waste stream containing 40 µg/L CrO42- if the treatment reduced the Cr concentration enough to meet a discharge limit of 10 µg/L (MCL proposed in 2013, voted into law in 2015 and ruled invalid in 2017 for California) or 50 µg/L (current MCL) CrO4²-?
The discharge of chromate ions (CrO42-) to sewers or natural waters is of concern because of both its ecological impacts and effects on human health if the receiving water is used as a drinking water source. One way in which chromate can be removed from solution is by its reaction with ferrous iron (Fe²+) to form a mixture of chromic hydroxide and ferric hydroxide solids [Cr(OH)3(s) and Fe(OH)3(s), respectively], which can then be filtered out of the water. The overall reaction can be represented as CrO4 + 3Fe2+ +8H₂O → Cr(OH)3(s) + Fe(OH)3(s) + 4H+ How much particulate matter would be generated daily by this process at a facility that treats 60 m³/h of a waste stream containing 40 µg/L CrO42- if the treatment reduced the Cr concentration enough to meet a discharge limit of 10 µg/L (MCL proposed in 2013, voted into law in 2015 and ruled invalid in 2017 for California) or 50 µg/L (current MCL) CrO4²-?
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter14: Chemical Equilibrium
Section: Chapter Questions
Problem 14.97QE: According to the Resource Conservation and Recovery Act (RCRA), waste material is classified as...
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![The discharge of chromate ions (CrO42) to sewers or natural waters is of concern because of
both its ecological impacts and effects on human health if the receiving water is used as a
drinking water source. One way in which chromate can be removed from solution is by its
reaction with ferrous iron (Fe²+) to form a mixture of chromic hydroxide and ferric hydroxide
solids [Cr(OH)3(s) and Fe(OH)3(s), respectively], which can then be filtered out of the water.
The overall reaction can be represented as
CrO4 + 3Fe²+ + 8H₂O → Cr(OH)3(s) + Fe(OH)3(s) + 4H+
How much particulate matter would be generated daily by this process at a facility that treats
60 m³/h of a waste stream containing 40 µg/L CrO4²- if the treatment reduced the Cr
concentration enough to meet a discharge limit of 10 µg/L (MCL proposed in 2013, voted
into law in 2015 and ruled invalid in 2017 for California) or 50 µg/L (current MCL) CrO4²-?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2ebe91de-3090-46ac-907f-d0393c4d1db8%2Fde49007f-df7f-4a72-8d04-f495af825814%2F7df8srf_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The discharge of chromate ions (CrO42) to sewers or natural waters is of concern because of
both its ecological impacts and effects on human health if the receiving water is used as a
drinking water source. One way in which chromate can be removed from solution is by its
reaction with ferrous iron (Fe²+) to form a mixture of chromic hydroxide and ferric hydroxide
solids [Cr(OH)3(s) and Fe(OH)3(s), respectively], which can then be filtered out of the water.
The overall reaction can be represented as
CrO4 + 3Fe²+ + 8H₂O → Cr(OH)3(s) + Fe(OH)3(s) + 4H+
How much particulate matter would be generated daily by this process at a facility that treats
60 m³/h of a waste stream containing 40 µg/L CrO4²- if the treatment reduced the Cr
concentration enough to meet a discharge limit of 10 µg/L (MCL proposed in 2013, voted
into law in 2015 and ruled invalid in 2017 for California) or 50 µg/L (current MCL) CrO4²-?
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