water efficiency - cesa imbizo 2019_kabel… · water efficiency: enhancing water consumption and...
TRANSCRIPT
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Water efficiency:
Enhancing water consumption and rainwater harvesting
Author: Kabelo Chabalala
Mechanical Engineer
National Department of Public Works and Infrastructure
Date: 13 August 2019
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ABSTRACT
• Increasing scarcity of fresh water
• Population increase, Lack of rain water
• Imposing water restrictions
• The use of grey water
• What is water efficiency?
• Reduction of water wastage
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OVERVIEW
• Problem statement
• Related work done by others
• Methods
• NDPW&I contribution towards water savings
• Summary
• Discussion (Q&A)
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PROBLEM STATEMENT
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RELATED WORK
• Western cape –Water restrictions
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WHY CAN’T WE USE SEA WATER?
• Lack of facilities
• Requires a lot of energy through desalination process to
break bonds in salt water
• Thermal distillation – Boiling water vapour
• Membrane separation – Reverse osmosis
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METHODS
• Grey water – Used for non-potable purposes
• Rain water harvesting
• Material selection
• Water metering
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GREY WATER
SHOWERS, WHB, SINKS, ETC
IRRIGATIONTOILET
WATER TREATMENT
WATER STORAGE
TANK
MUNICIPAL WATER
DRAIN/ IRRIGATION
BOOSTER PUMP
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WASTE WATER RECYCLING
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RAIN WATER HARVESTING
BOOSTER PUMP
RAINFALL
MUNICIPAL WATER
GUTTER/COLLECTOR
COARSE FILTER
WATER STORAGE TANK OVERFLOW CHANNELLED
TO GARDEN/ SEWER
ROOF
WATER SUPPLY FILTRATION
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PIPE MATERIAL SELECTION
37% water lost due to aged and leaking infrastructure
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WATER PIPE LIFESPAN
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WATER METERING
• Historical water use against population size
• Identify trends and extrapolate future water demands
• Data capturing
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NDPW&I CONTRIBUTION
• Custodian of government buildings
• High water demand in public buildings
• NDPWI instrumental and significant in contributing towards
water savings
• Development of green building norms and standards
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SUMMARY/TAKE-HOME POINTS
• Reduce water bills
• Reduce water demand
• Pipe material selection
• Water consumption monitoring