reed water bed by psda

7/27/2019 reed water bed by PSDA

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Making of Reed Water Bed

atPSDA Of ce

4 Windmill Place, Ayanagar VillageNew Delhi 110047 IndiaTel +91 (0)11 26503741 / 26503859Fax +91 (0)11 [email protected]

September 09


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Introduc on

Constructed wetlandsConstructed wetland systems are simple, locally manageable and cost e ec ve biological wastewatertreatment systems that u lise wetland plants, soil, and their associated microorganisms to mimic naturalwetland eco systems processes for the treatment of waste water.

As the water ows through the bed, it gets treated through natural processes; pollutants in the wastewater are mechanically ltered, chemically transformed and biologically consumed. With respect to thedirec on of waste water ow (i.e. horizontal or ver cal ow), constructed wetlands are divided into reedbeds, also known as Horizontal Flow Constructed Wetlands and Ver cal Flow Planted Gravel Filters.

Preliminary treatment or pre-treatment of wastewater for removal of oil and fat, hair, lint, food residue,large solids etc. by sedimenta on and oata on is required upstream the constructed wetland system.

Advantages1. Established technology

2. Natural looking3. Good pathogen removal due to die o and preda on4. Minimal maintenance5. Can use wide range of water plants6. Robust7. Treated water if t for non potable use: surface applica on, irriga on, and discharge to receiving

water bodies

Role of Plants1. Provide beauty , making people more likely to care for the system2. Transport air to their roots, which may enhance treatment locally3. Release selec ve biocide compounds, killing harmful microbes4. Provide physical ltra on and electrosta c a rac on of small par cles5. Provide a habitat for microorganisms and larger consumer organisms6. Take up some heavy metals

At PSDA o ce, Horizontal Flow Constructed Wetland has been adopted to treat the wastewater.

Treatment process in wetland at PSDA o ce Primary treatment takes place in the se ler/sep c tank, where the sludge se les down and scum oatsin top and the clear liquid ows to the collec on chamber. From this chamber water is pumped using asmall manually operated pump to the root zone treatment system for secondary level treatment.

The secondary treatment takes place in the root zone system where the removal of nitrates andphosphates takes place by plants and through its root system injects oxygen to the wastewater whichows in the gravel bed. The nal treated water collected in the storage tank is pumped and used forhor culture purpose.

Water usage for toilet and kitchen 2 KLD

Number of users 30

Area of reed bed 11 m 2

Cost of construction Rs. 85,000

Data for reed water bed constructed at PSDA

Making of reed water bed 1


3/11Making of reed water bed 2

Site Plan - PSDA O ce, Ayanagar


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Tank for over ow waterfrom sep c tank

Base prepara on

Brick work and plaster


Stages of Construc on


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Tank for treated water

Canna plan ng with coiraround the roots


Planted cannas


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Water being pumpedfrom over ow water tank


Completed reed waterbed

Reed bed sec on


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Water Quality Report - over ow water from sep c tank



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Water Quality Comparison


RAW WATER AFTER REED-BED TREATMENT

PH 6.95 7.32

Total Suspended Solids in mg/l 42.8 28

Chemical oxygen Demand 154.6 32.2

BOD for 3days at 27*c 69 13

Faecal Coliform per 100ml 51 17

Oil & Grease 1.3 1.8

Phosphates as PO4 135.3 84.3

Nitrates as NO3 0.03 0.05

Water Quality


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References

Advisors

Sewage Solu ons: Answering the Call of Nature ; Nick Grant, Mark Moodie, Chris Weedon;2000; Centre for Alterna ve Technology Publishing, UK

Do-it-yourself: Recycle and Reuse Wastewater ; 2008; Centre for Science and Environment, New Delhi

R.K. Srinivasan, Centre for science and environment, New Delhi

Mahesh Babu, Mc D Built Environment and Research Laboratory Pvt. Ltd. Bangalore

Mukesh Asija, Krim Engineering Services, New Delhi

reed water bed by psda

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