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water and environmen

biofuels class

QuestionAnswer
What are the ways water impacts 1. 2. - a - b 1. water demand/ consumption 2. water quality - agricultural drainage - bio-refinery effluent
water consumption - what is increasing faster than any other sector? - from what? how much is it contributing to agriculture? energy production from domestic production of ethanol - corn ethanol is almost as large as corn used for feed: big contributor to general market
How are impacts of water relative? energy system intersect with water in a lot of ways - lots of water is used for various fuels - ex: 5 gal of water per gal of gasoline
how water impacts feedstock production 1. irrigation demand and water depletion - consumption 2. water quality - surface water --> irrigation - ground water
Talk about water requirements for irrigation what's the fundamental issue 1. there's a water demand in irrigation 2. plants don't use all the water, a lot of it runs off after passing - water is a limiting resource
why is ground water depletion bad? - ground water = long term storage - land subsidence from ground water pumping - ground water dynamics: pull water out, water table gets sucked down
Water quality impacts 1. agricultural run off - surface water nutrient enrichment - surface water sedimentation 2. agricultural water infiltration - groundwater contamination
Describe how fertilizer application and nutrient enrichment can lead to hypoxia 1. nutrients feed biological systems 2. algae eats nutrient and algae blooms occur 3. then algae dies 4. bacteria degrades it and takes in O2 5. bacteria taking O2= no O2 in the water 6. creation of a deadzone
what can we conclude from the integrated analysis/ LCA 1. water intensity of corn ethanol is large 2. even accounting co- products, water requirements of ethanol are very large - water quality impacts of ethanol are also large
what are ways to save water/ not use so much water 1. improve current production 2. switch to biofuels with lower water impacts
Created by: sunying12
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