The document discusses the concept of grey water, which is wastewater from sinks, showers, and laundry, advocating for its reuse as a sustainable resource for agriculture and irrigation. It describes a modified drawer compacted sand filter (DCSF) and its advantages, including efficient filtration and maintenance, while also highlighting the improved functionality of a modified DCSF (MDCFS) using silver-coated sand for disinfection. Overall, the document emphasizes the environmental benefits of grey water recycling, including water conservation and pollution reduction.

1. 1
MODIFIED DRAWER COMPACTED
SAND FILTER
ABIJITH G
CIJI B
HARIPRIYA M
JIVIC J PANACKAL
SIJITHA SIDHAN

2. 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

3. 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

4. DCSF
Filter 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=4mm
Orifice spacing=10cm
Number of orifices =15

5. Advantages of DCSF
 Aerobic 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

6.  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

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

8. 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

9. 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

10. THANK YOU