Greywater Recycling & ReusePRESENTATION ON

What is Greywater? Greywater or sullage is defined as wastewater generated from wash

hand basins, showers and baths, (but not from a kitchen sink or toilet) which can be recycled on-site for uses such as Water Closet (WC) flushing, landscape irrigation and constructed wetlands.

What is Blackwater?

P.I.: For the process of simplification, ‘Greywater’ is abbreviated as ‘GW’ as needed

Greywater is distinguished from ‘Blackwater’ which is wastewater from WC flushing, kitchen sinks. Blackwater should not be reused in the home because of high risk of contamination by bacteria, viruses and pathogens.

What is GW treatment?

GW treatment is removal of unwanted suspended material from the greywater collected and disinfecting the same to make it useful for toilet flushing or irrigation or discharging to sewer lines according to the local laws applicable.

Why reuse GW? GW Recycling can save upto 35-40% of water consumption

within a residential building by reusing shower & basin water for the use of toilet flushing, irrigation, car washing, cleaning, etc.

Conventional plumbing systems dispose of greywater via septic tanks or sewers. The many drawbacks of this practice include overloading treatment systems, contaminating natural waters with poorly treated effluent and high ecological/economic cost

Instead, you can reuse this water. The most common reuse of greywater is for irrigation.

Even a greywater disposal system has less negative impact than septic/sewer disposal

8 Advantages of GW Recycling & Reuse

1) Save water (30-35% reduction in consumption) and money2) Reduce the demand on your reservoir/toilet distribution

pumps3) Increase the lifespan of your septic system4) Less strain on public sewage treatment system5) Reduction in energy use by the municipality6) Increase points to reach LEED certification goals7) Groundwater recharge8) Reclamation of otherwise wasted nutrients

Reuse applications of treated GW

Watering Gardens Fire hydrants Field Irrigation Toilet flushing Cooling tower make-up

Case Study

REVOSIS GW System proposed for a building with an occupancy of 225 Apartments, to treat approximately 49,500 Gallons / day [180 m3/d] of greywater . REVOSIS GW System captures greywater discharged from the building’s showers, bathtubs, hand basins (All wastewater apart from toilet & kitchen).

Assumptions (Average): Residents per apartment: 3

Daily water usage

Water consumption chart

Feed Volume to GW systemParameters Value UnitTotal volume of wastewater generated from 1 apartment

240 Gal / day

Volume of Toilet Flushing 28 Gal / dayVolume of Greywater (actuals) 240 – 28 = 212 Gal / day

Volume of Greywater (rounded off)

220 Gal / day

No. of apartments in the building

225 Nos.

Total volume of Greywater for 1 building

220 x 225 = 49,500 Gal / day

49,500 x 30 = 1,485,000 Gal / month

Total capacity of GW Recycling System = 49,500 Gal / day = 180 m3 / day

Process Flow Diagram

Greywater Analysis (Typical)Parameter Units Minimum Maximum TypicalpH - 7.2 9 7.5Alkalinity (as CaCO3) mg/l 75 200 100Total Suspended Solids mg/l 20 45 30Conductivity uS/cm 1,000 1,600 1300TDS (measured) mg/l 500 1,000 800BOD5 mg/l 20 45 30COD mg/l 60 400 200Oil & Grease mg/l 10 20 15Calcium mg/l 50 80 65Magnesium mg/l 10 35 20Sodium mg/l 150 760 390Chloride mg/l 200 1,050 520Fluoride mg/l 0.8 5 2Potassium mg/l 30 60 50Sulfate mg/l 10 70 50Silica mg/l 60 75 70Total Silica mg/l 75 100 85Temperature deg C 20 30 25

System recovery, process scheme & design may change as per the detailed and actual water analysis parameters from the site

Savings ProjectionDescription Value UnitsFreshwater required for GW usage(before recycling)

1,485,000 Gal / month

Cost of water* 77,125 AED / month

Freshwater required for GW usage(after recycling)

965,340 Gal / month

Cost of water* 50,095 AED / month

Savings 27,030 AED / month324,360 AED / year

* Cost of water is based on the current water tariff by DEWA

(http://www.dewa.gov.ae/tariff/newtariff.aspx)

Payback periodDescription Values UnitsRO System XXXXXX AEDAncillaries (Tanks, Piping, Commissioning, Civil)

XXXXXX AED

Total Investment 496,800 AEDSavings (from previous slide) 324,360 AEDPayback period 1.5 Years

Case Study Report REVOSIS GW System recycles and saves 17,325 Gallons of drinking

water a day, over 6 million gallons per year The recycled and treated water from the REVOSIS GW System is fed in

to the main water supply line to the toilet flushing lines, to supplement the municipality feed line. Hence, reducing fresh water consumption considerably.

GW is recycled and treated to the highest recycled water standards approved by local Health authorities

Recycled water is distributed around the building for non-drinking purposes apart from toilet flushing. For eg, district cooling, irrigation, etc.

REVOSIS turn-key approach includes design, project management, installation, commissioning, operations & service contracts.

Our Technology

The core technology at REVOSIS is a compact Reverse Osmosis based Recycling Plant with specially coated Poly amide membranes which are low fouling. After effective pre-treatment by oil skimmers, sand filters and cartridge filters the influent is introduced to the heart of the system which are the RO membranes. The specialised RO membranes which are capable of handling high influent characteristics segregates the purified water from the concentrated reject. The purified effluent then passes through the Ultraviolet undergoing disinfection and Chlorine to achieve a chlorine residual. This multi-barrier treatment approach is what ensures the treatment plant to confidently handle variable wastewater qualities that are typical of decentralized greywater schemes.

REVOSIS GW Recycling System – Key Benefits

Fast and consistent reduction of suspended solids Occupies less space Viable warranty conditions Low maintenance & simple operation Low energy consumption Minimal use of chemicals Delivered as a skid mounted package plant Systems can be increased in capacity (in future) as a duplex plant Low cost compared to conventional grey water systems

Your Queries…

Please feel free to contact us for any clarifications on the below contacts at all times.

REVOSIS Water Technology Solutions LLC,P.O. Box 125082, Dubai, UAE.

T: +971 4 2520 617 | F: +971 4 2576 833 | M: +971 55 2308 194E: info@revosis.com | W: www.revosis.com

Thank you!