This document discusses a study on gray water treatment using various inorganic filter beds. The study fabricated a gray water treatment system on a laboratory scale using burnt bricks, gravel, and sawdust as filter mediums. Experimental results showed that burnt bricks reduced total dissolved solids by 34.7% on average, while gravel performed best at removing turbidity by 83.9% on average and reducing biochemical oxygen demand by 19% on average. The system was effective at treating gray water and provides environmental benefits like decreased pollution and freshwater extraction.

1. GROUPMEMBERS
DANISH KHAN 15CH135
SHAN E RAB KHAN 15CH141
HILAL KHAN 15CH39
FAROOQAHMED 15CH153
1

2. Tittle: Gray water Treatment
by various Inorganic filter
beds
Authers: Engr.Abdul
Qadeer Laghari
Engr .Manzoor-ul-
HaqRajput
Dr.Zeenat M.Ali
Engr .Arshad
Iqbal
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3. 3
Abstract: The Greywater Treatment
System was fabricated on laboratory
scale. The burnt bricks, gravel and
sawdust were used as filter medium
with particle size of 1mm.The flow rate
from sample holding tank to collection
tank was 0.6L/min. The attempt was
made to analyze the effects of filter
mediums on decontamination of
greywater samples. The experimental
results showed that the burnt bricks
reduced the mean total dissolved
solids (TDS) 34.7% ± 2.67. The gravel
exhibited the better results in mean
turbidity removal 83.90% ± 1.89,
reduced the mean BOD 19% ± 3.4 and

4. INTRODUCTION
GREYWATER is non-industrial waste water.
It is generated from domestic usages including showers,
bathroom sinks, kitchen sinks, dish washers, & washing
machines.
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5. Grey water may contain fats, oil, grease, hair, detergents,
nutrients, salts, fabric, softeners and other chemicals.
Grey water should not be used to irrigate root crops, or
edible parts of food crops that Grey water contains
pathogenic microorganisms including bacteria , protozoa ,
viruses and parasites in concentrations therefore a level of
caution must be exercised with grey water.
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6. CLASSIFICATION OF GREYWATER
Grey water is classified into two sub-categories:
Light grey water
Dark grey water
LIGHT GREYWATER:
Light grey water typically consists of drainage from
bathroom sinks , showers, and often laundry.
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7. Light grey water may have lower
concentration of containments than mixed
waste water.
DARK GREY WATE
Dark grey water includes both light grey water plus drainage from kitchen sinks,
automatic dish washers or other sinks involving food preparation.
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8. COMPOSITON OF GREY WATER
The composition of grey water depends on each house
holds activities and varies according to socio-economic
status, cultural practices, cooking habits, cleaning
agents used, as well as demography. In general grey
water contains:
Showers and bath water contributes 35% waste water
Hand basins 5%
Laundry 23%
Kitchen 7%
Total approx. 70% of waste water is grey water. 8

9. DESIGN AND FEBRICATION OF LAB SCALE GRAY
WATERTREATMENT UNIT
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10. Filter Medium(Burn Bricks, Gravels, Saw Dust 4mm
size)
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11. METHODOLOGY
FOR GRAY WATERTRETMENT
.
The experimental unit was designed in view that Gray water
samples run through gravity from bed of Burn Bricks, Gravel
and Saw Dust separately and collected in collection unit for
analysis. For that the floor mounted vertical unit was
fabricated (Fig ).
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12. The frame consist of three horizontal
racks for holding three separate feeding
tanks at top and filter medium holding tank
in mid and collection tanks were set at last
racks. The frame was made of wooden
racks and the tanks were of sterilized
polyethylene bottles with capacities of 5
liters each.
The plastic pipe and control valve was fixed
to control the flow rate.
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13. The flow rates of Gray water samples from feeding tanks to
collection unit were 0.6mm/min.
.
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14. ANALYSIS RESULTS
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15. ENVIROMENTAL BENIFITS
Decreased rate of groundwater and freshwater pollution
from chemicals due to direct disposal of untreated water
Decreased rate of freshwater extraction
Reduced use of energy for wastewater treatment
Nitrification of topsoil as a result of reclaiming otherwise
misdirected nutrients
Plant growth, Groundwater recharge
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17. Conclusion
• This study was concluded that three filter medium burnt bricks,
gravel and sawdust were tested for decontamination of
greywater. The beds of mediums were maintained and samples
were eluted. The greywater testing parameters were pH,
temperature, TSS, turbidity, TDS, EC, DO, BOD and COD. The
study revealed that sawdust was effective in pH normalizing,
temperature lowering down, TSS and turbidity elimination. The
gravel was effective in BOD and COD reductions. It was
improving the DO level as well. The entire filter medium showed
almost same results in EC measure
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Reference
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