water conservation in building design - oryx...
TRANSCRIPT
Syska Hennessy Group
J366
Water Conservation in Building Design WCE2015
Daniel H. Nall, PE, FAIA, FASHRAE,
LEED Fellow, BEMP, HPDP Date
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methods, and services will be addressed at the conclusion of this presentation.
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Course ID: 0920005383
WATER CONSERVATION IN
BUILDING DESIGN
By ASHRAE
Approved for:
1 General CE hours
0 LEED-specific hours
This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written
permission of the speaker is prohibited.
Syska Hennessy Group
© Syska Hennessy Group 2015
Copyright Materials
This presentation will discuss options for water conservation and wastewater harvesting techniques. Technology for water conservation will be discussed. Utilization of on-site non-potable water resources will be discussed, and methods of capturing and treating these resources will be presented. The requirements of water consumption end-uses that can benefit from non-potable resources will be presented, along with technical issues that limit the exploitation of these resources. A case study showing a 2/3 reduction in potable water consumption through the utilization of both conservation measures and non-potable water harvesting will be presented
Course Description
Learning Objectives
1. Recognize how HVAC systems use water and how they generate non-potable water
resources.
2. Integrate different strategies of water conservation for dramatic reductions in
consumption.
3. Allocate different types of reclaimed water to different types of non-potable uses.
4. Overcome contamination issues to optimize re-use of harvested waste water.
At the end of the this course, participants will be able to:
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WATER CONSERVATION IN BUILDING DESIGN
20/03/2016
• The upcoming water crisis and the natural water cycle
• Water conservation opportunities in buildings
• Non-potable water resources in buildings and end-uses that don’t require potable
water
• Non-potable water treatment options for buildings
• The total dissolved solids issue for treated wastewater and methods of dealing with
that issue.
• A successful case study for dramatic water use reduction.
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Presentation Outline
World Water Shortage 2040
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Per Capita Water Consumption
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The Natural Water Cycle
• Reduced Primary Potable Consumption
• Low flow Fixtures
• Water Sense Appliances
• Identify Non-Potable End Uses
• Flushing
• Irrigation
• Cooling Tower Make-up
• Exterior Housekeeping
• Harvest Non-potable Resources
• HVAC Condensate
• Stormwater Roof Run-off
• Cooling Tower Blow-down
• Surplus Groundwater
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WATER CONSERVATION IN BUILDINGS
Residential Low Flow Plumbing Fixtures
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Up to 33% Savings
6.0 L/flush (typical) vs.
3 L/flush
Private Toilets (dual flush water closets)
9.5 L/flush (typical) vs.
7.6 L/min
Up to 20% Savings
Up to 28% Savings
9.5 L/min (typical) vs.
6.8 L/min
Kitchen Faucet
Up to 80% Savings
8.33 L/min (typical) vs.
1.9 L/min
Lavatory Faucet
Residential Shower Head
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Cooling Tower Blow-Down Control
QMU = QE + QD + QBD Where: QMU = Make-up water flow rate QE = Evaporative Loss Rate QD = Drift Flow Rate QBD = Blow-down Flow Rate COC = QMU / (QD + QBD ) Where: COC = cycles of concentration QMU = Make-up water flow rate QD = Drift Flow Rate QBD = Blow-down Flow Rate TDSB = COC * TDSMU Where: TDSB = Total Dissolved Solids in Basin Water TDSMU = Total Dissolved Solids in Make-up water Measured Conductivity is roughly proportional to TDS.
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Irrigation Delivery and Control
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Water Consumption in Buildings
Source: US Environmental Protection Agency
Laboratory Water Consumption Office Building Water Consumption
58% Non-potable • Cooling tower make-up • Irrigation • Single pass cooling • 60% of sanitary (flushing)
73% Non-potable • Cooling/heating • Irrigation • Single pass cooling • 60% of sanitary (flushing)
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Alternative Sources of Non-Potable Water
Water Source Debris Suspended
Solids
Dissolved
Inorganics
Dissolved
Organics
Microbia
City Water None Very Low Low Very Low Very Low
HVAC
Condensate
None Very Low Very Low Very Low Very Low
Stormwater
(Roof)
Low Medium Low Low Low
Stormwater
(Grade)
Medium Medium Varies Varies Medium
Washwater Low Low Low Medium Low
CT Blowdown Low Medium Medium Low Low
STP Effluent None Very Low Low Very Low Very Low
Blackwater High High Medium High High
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Matching Sources and Uses
Water Source Primary Use Secondary Use
City Water Ingestion Personal Hygiene
HVAC Condensate Flushing Domestic Hygiene
Stormwater
(Roof)
Flushing CT Make-up
Stormwater
(Grade)
Irrigation
Washwater Irrigation
CT Blowdown Irrigation (R.O. ?)
Treated Blackwater CT Make-Up Irrigation
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Criteria for Using Non-Potable Water
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Greywater (Wash Water) Characteristics
Typical Composition of Greywater (wash water)
Parameter Unit Greywater range
BOD5** mg/L 90–290
TSS (Total Suspended solids)** mg/L 45–330
Turbidity** NTU 22–200
Fecal Coliform* MPN/100mL 103 - 106
pH** – 6.6–8.7
* Residential greywater reuse study; greywater reuse survey: Data and Evaluation of results. Southern Arizona, USA. Water CASA, 2003
** Jeppersen B, Solley D. 1994. Model guidelines for domestic greywater reuse for Australia. Research Report No. 107. Urban Research Association of Australia, Brisbane City Council.
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Greywater Harvesting for Trickle Irrigation
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Using Greywater
Greywater Treatment Stages
Treatment Stage Purpose Technologies End Uses
Preliminary Removal or particulates and grit particles Screening, settling Trickle (sub-surface)
Irrigation
Primary Removal of suspended solids Screening sedimentation Surface Irrigation of ornamental plants
Secondary Biological treatment and removal of common biodegradable organic pollutants
Percolating or trickling filter, activated sludge, anaerobic treatment, waste stabilization ponds (oxidation ponds)
Cooling Tower Make-up
Tertiary Removal of specific pollutants such as nitrogen or phosphorus, color, odor, and fine suspended particles
Sand filtration, membrane bioreactor, reverse osmosis, chemical coagulation, activated carbon/
Flushing
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Criteria for Interior Usage of Recycled Water
Summary of ANSI/NSF Standard 350 Effluent Criteria for Graywater Treatment Systems Parameter Class C (Commercial or Multi-Family Interior Use) Test Average Single Sample Maximum CBOD5 (mg/L) 10 25 TSS (mg/L) 10 30 Turbidity (NTU) 2 5 E. coli 2
(MPN/100 mL) 2.2 200
pH (SU) 6.0 – 9.0 NA Storage vessel disinfection
(mg/L)3
≥ 0.5 – ≤ 2.5 NA
Color MR NA Odor Nonoffensive NA Oily film and foam Nondetectable Nondetectable 1 NA: not applicable 2 Calculated as geometric mean 3 As total chlorine; other disinfectants can be used
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Rainwater Harvesting for Interior Use
DIN 1989 Tank Sizing Standard
VT = lesser of
.06 * AR * RAA * Ya * KRO * eF
Or .06 * D
Where: VT = volume of storage tank
AR = area of catchment roof
RAA = annual average rainfall
KRO = roof yield (0.4 to 0.75)
eF = efficiency of the filter
D = annual water consumption
for targeted end use
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HVAC Condensate Recovery for Interior Use
• Tank typically sized for 1 design day
condensate production
• Tank may much smaller for
continuous usage such at CT make-up
• Make-up float valve only keeps lift
pump inlet submerged
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Community Scale Sewage Treatment Enables Capture of
Effluent for Non-Potable Uses
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DEWATS – Decentralized Waste Water Treatment
System
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DEWATS Finishing Bed
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The “Improved” Urban Water Cycle
Optimal Usage of Alternative Water Sources
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Recycling Treated Sewage Effluent
Dissolved Solids Contamination of Building Sewage Effluent
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High TDS to Flushing; Rainwater/Condensate to CT
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High TDS to Flushing;
High TDS to Flushing; RO/Condensate/Rainwater to CT
Net Zero Liquid Discharge CT Water Treatment
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-
5,000,000
10,000,000
15,000,000
20,000,000
25,000,000
30,000,000
35,000,000
1 2 3 4
L/Ye
ar
Water Re-Use Strategy
Potable Water Consumption by End-Use
Misc. Potable Uses CT Make-up Flushing Water
Sewage Effluent Flushing Only
Comparison of 3 Water Recycling Strategies
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CT with Zero Liquid Discharge Sewage Effluent Flushing; Blowdown RO
Base Case; No Recovery
Case Study – Godrej Headquarters
LEED Platinum – India Green Building Council LEED NC 39
Godrej Water Efficiency Measures
Potable Water Use limited to Ingestion, Personal Hygiene
and Food Service
All Other Uses Non-Potable
Non-potable Resource Reclamation
HVAC Condensate Centrally collected
One Million Gallon Stormwater Storage Tank
Brackish Foundation Drain Effluent Collected
Cooling Tower Blowdown Collected
Reclaimed Water Treatment
Stormwater Filtered and Chlorinated
Tertiary Blackwater Treatment with MBR System
CT Blowdown and Groundwater Treated with Reverse Osmosis
to Remove Dissolved Solids.
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Membrane Bioreactor Blackwater
Treatment
Effluent has Very Low BOD,
Little Impact on TDS
For Removal of Suspended or Dissolved Organic Material
By M brannock at English Wikipedia,
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Packaged Reverse Osmosis Systems
14,000 gpd input at 1500 ppm TDS
11,000 gpd output at 80 ppm TDS
3,000 gpd waste at 6,700 ppm TDS
< 1.0 kWh/ per m3 water output
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For Removal of Dissolved Solids (Inorganic Salts)
Godrej Headquarters Water Diagram
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Godrej Water Efficiency Results
Usage124,740 l/day Potable from City
94,500 l/day Non Potable flushing
124,740 l/day Non Potable Cooling Tower Make-up
15,120 l/day Non Potable Irrigation
359,100 l/day Total Usage
Sources124,740 l/day Ingestion, Food Service, Personal Hygiene
177,660 l/day Blackwater Treatment
23,436 l/day Treated Foundation Drain Efluent
18,144 l/day Treated Cooling Tower Blowdown
11,340 l/day HVAC Condensate
3,780 l/day Stormwater Storage
359,100 l/day Total Supply44
Godrej Headquarters, Mumbai, India Architect – Pelli, Clarke, Pelli, New York, NY, USA
MEP Engineering – WSP Flack + Kurtz, New York, NY, USA The engineering work described here was performed or supervised by Daniel H. Nall, PE, FAIA (currently with Syska Hennessy Group) while he was a Senior Vice President at WSP Flack + Kurtz, in New York City, NY
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ACKNOWLEDGEMENTS:
Questions? THANK YOU! Dan Nall, P.E., FAIA, FASHRAE, LEED Fellow, BEMP, HBDP [email protected]