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Green Dorm Wastewater System. JBM Associates BinBin Jiang Megan Bela Michael Murray June 7, 2005. Living Laboratory Sustainable Living Pioneer Model for Future Change. Sustainable Buildings at Stanford Today. Leslie Shao-ming Sun Field Station: Rainwater catchment, waterless urinals.

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Green dorm wastewater system
Green Dorm Wastewater System

JBM Associates

BinBin Jiang

Megan Bela

Michael Murray

June 7, 2005


Living Laboratory

Sustainable Living

Pioneer Model for Future Change


Sustainable Buildings at Stanford Today

Leslie Shao-ming Sun Field Station:

Rainwater catchment, waterless urinals

Vaden Health Center:

No water savings

  • Escondido Village 5 & 6:

  • Low flow appliances

  • Efficient irrigation

  • Native plants

  • Minimize runoff


  • Water Goals:

  • 50% reduction of potable water use

  • 100% reduction of lake water use

  • 50% reduction of wastewater

  • discharge


Project Structure:

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Working Definitions

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


House

Layout

Urine Treatment

Anaerobic

MBR

Equaris

ZeeWeed

MBR

Lab

Fertilizer

Production

Sewer

Ex. water

supply

Compost

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Water conserving strategy
Water Conserving Strategy

  • Water conserving washing machines

    • LG WM2677H

    • 40.9→12gal = 71%

  • Low flush toilets

    • Caroma Smartflush

    • 1.5→0.95gpf = 37%

  • Low flow showerheads

    • Niagara Prismeare

    • 2.11.5gpm = 28.5%

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Water balance
Water Balance

  • Purpose:

    Viability of water reuse scheme

  • Source of data: AWWA water use survey/Stanford data

  • Method

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Water balance assumptions
Water Balance- Assumptions

Regulatory ambiguity concerning clothes

washing water

  • Scenario 1 – All clothes washing water recycled

  • Scenario 2 – Clothes washing water sent to sewage

1

Recycled Water

Clothes Washers

Toilets

Irrigation

2

Sewage

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Water balance results
Water Balance - Results

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Nutrient balance
Nutrient Balance

  • Purpose

    • Identify major nutrient sources

    • Optimize treatment for reduction in nutrient loading

  • Methodology

    • Scale per-capita production of BOD, COD, N, and P (from literature)

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Nutrient balance results
Nutrient Balance - Results

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Nutrient balance conclusions
Nutrient Balance - Conclusions

  • Compost pile for kitchen scraps removes 35% of P

  • Divert up to 60% of N, 25% of P by separating urine

  • Liquid kitchen waste comparable to solid toilet waste as nutrient source

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Water quality of wastewater stream
Water Quality of Wastewater Stream

  • Purpose

    • Identify experimental uses

    • Optimize grey and black water treatment

  • Methodology

    • Combine water and nutrient balances

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Water quality of wastewater stream results
Water Quality of Wastewater Stream - Results

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Water quality of wastewater stream conclusions
Water Quality of Wastewater Stream - Conclusions

  • Separated urine is highly concentrated source of N and P -> fertilizer

  • BOD levels comparable in liquid kitchen and solid toilet waste -> combine treatment

  • Concentrated laundry water diluted by showers

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Overview of Greywater System

Urine Treatment

Anaerobic

MBR

Anaerobic

MBR

Equaris

ZeeWeed

MBR

Lab

Lab

Sewer

Fertilizer

Production

Ex. water

supply

Ex. water

supply

Compost

Compost

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Greywater treatment equaris system
Greywater Treatment: Equaris System

Surge Tank

Clarifying Tank

Aeration Tank

www.equaris.com

Standard wastewater treatment with extended aeration

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Greywater treatment equaris system1
Greywater Treatment: Equaris System

  • 950 lpd capacity per system

  • 68 lpd per capita

  • 55 people

www.equaris.com

NRDC- Santa Monica

www.equaris.com

4 systems needed (3740 lpd total)

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Greywater treatment zeeweed membrane bioreactor
Greywater Treatment: ZeeWeed Membrane Bioreactor

www.zenonenv.ocm

Aerobic Membrane Bioreactor by Zenon

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Greywater Treatment: Zeeweed Membrane Bioreactor

www.zenonenv.ocm

  • 1470 lpd to 75,800 lpd

  • Able to treat greywater and blackwater

City of San Diego

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Comparison of two systems
Comparison of two systems

Cost

Water Quality

Footprint

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Recommendation:

Phase I: Installation of Equaris

Phase II: Installation of ZeeWeed MBR

In the future:

Both systems can be expanded to

include other row houses. Drinking water

purification in the future possible

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Greywater irrigation clivus multrum

Available grey water:

51 liters/day

GW used by toilet flushing:

16.7 l/d

GW used by washing machines :

17.3 l/d

Amount of grey water left for irrigation:

Greywater Irrigation: Clivus Multrum

17 l/d or 34 l/d

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


More cost effective alternative water storage until summer and pump for irrigation
More cost-effective alternative: Water storage until summer and pump for irrigation

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Data logging and sampling
Data logging and sampling

  • Monitor water quantity from each facility (GW and blackwater): flow, velocity

  • Monitor water quality: turbidity, pH, water level, TDS, etc

  • Water samples to lab for detecting pathogens

Watersensors.com: YSI ADV6600 Water Quality and Quantity Sonde

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Overview of blackwater system
Overview of Blackwater System

Liquid Kitchen

Waste

Anaerobic

MBR

Urine-Separating

Toilets

Sewer

Storage,

Treatment

Fertilizer

Production

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Urine separation
Urine Separation

  • Divert N and P from wastewater stream

  • N:P ratio of 6.7 optimal for agriculture

  • Utilized in ancient China and modern Europe

  • Green Dorm could fertilize 4.5 acres of tomatoes or 3.5 acres of corn annually

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Urine separation system
Urine Separation: System

Urine-separating toilet diverts

1.25 l/pd urine plus 0.75 l/pd flush

Ekologen

Fiberglass Storage

Tank

15 m3

Empty 2x per year

Onsite

Treatment Tank

6 months at

20°C

Diluted or As-Is

Fertilizer

Application

Urine Stream

(Non-Metal

Piping)

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


The future anaerobic mbr
The Future: Anaerobic MBR

Potable Water

Solid Toilet

Waste

Anaerobic MBR

Electricty from

Methane

Sludge

Composter

(CO2)

Experimental MBR at

University of Bath, UK

Initial Assumptions

Water Balance

Nutrient Balance

Greywater System

Blackwater System


Anticipated Performance

Potable water savings: 45%

Wastewater discharge reduction: 65–74%

Reduction of N in wastewater effluent: 12-55%

Pioneering new technology and processes

Urine Treatment

Anaerobic

MBR

Anaerobic

MBR

Equaris

ZeeWeed

MBR

Lab

Lab

Fertilizer

Production

Sewer

Ex. water

supply

Ex. water

supply

Compost

Compost



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