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MODIFIED DRAWER COMPACTED SAND FILTER

ABIJITH G CIJI B HARIPRIYA M JIVIC J PANACKAL SIJITHA SIDHAN

Grey water is defined as the waste water that is obtained from showers, kitchen, laundry etc. excluding black water (toilet water).

It is a sustainable water resource that can significantly reduce the usage of fresh water for agriculture.

Grey water

now

?.Why reuse Grey Water

Treated GW will act as a substitute to those applications which do not require drinking water quality.

As the treated grey water is high in nutrients (i.e. N2, P) we can use it for irrigation purpose.

GW recycling will reduce the load on the sewage treatment plant.

Advantages

 Save water (30-35% reduction in consumption) and money

Reduction in generation of waste water will reduce potential of environmental pollution

Reduction in surface and ground water pollution

Sustainable Development

DCSFFilter medium

Drawer 1 Gravels; effective size 4.75 mm

Drawer 2 Silica; effective size 1.18 mm

Drawer 3 Silica; effective size 600micron

Drawer 4 Silica; effective size 75micron

Drawer 5 Silica; effective size 1.18mm and

600micron

Drawer 6 Granular activated carbon

Depth of media 10cm (for each drawer)

Perforation – for each drawer –

except the lowest one

Orifice size=4mmOrifice spacing=10cm

Number of orifices =15

Advantages of DCSFAerobic treatment in all layers.

Clogging is no longer serious problem.

Excavation works are no longer required.

The DCSF only requires 1m2 of land area.

This maintenance procedure is very convenient comparing to the intermittent sand filter

It cannot remove all type of microorganism

Rate of filtration is less

Filtered water can not be stored for more than 24 hr

Disadvantages of DCSF

MDCSF

Replacement of : 4th layer by silver coated sand 5th layer by coconut shell activated charcoal

Advantages of MDCF

Disinfection with silver,

Reduces bacteria, protozoa and industrial parasites

it doesn't produce any taste or odour in the treated water

No by – products are formed as a result of its use

Increases the % removal than DCSF

For the purpose of landscaping, gardening, irrigations, plant growths and toilet flushing.

The benefits found are low energy demand, less operating and maintenance cost, lower load on fresh water, less strain on septic tank, highly effective purification, and ground water recharge.

So, this is an environmental friendly, without chemical operation ,cost effective and resourceful plant for rural development.

Conclusion

THANK YOU