UNIT-4 SECONDARY TREATMENT OF SEWAGE 1. What are the types of
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trickling filters?
Conventional trickling filter
High rate trickling filter
2. What are the operational troubles in trickling filter? . Fly nuisance
b
. bdour nuisance . Ponding troubles
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3. Defne sludge age The sludge age is defined as the average time for which particles ofsuspended soil remain under aeration
4. Define sludge volume index Sludge volume index is defined as the volume occupied in ml by 1 gm of so[ds
h tte mixcd
liquor after settling for 30 minutes and is determined experimentally. I
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5. What is meant by biodegradable organic matter? The organic matters is decomposed by bacteria under biological action is called biodegradable organic matter'" 6. What are the
. . . .
Turbidity test Colour test Odour test Temperature test
7, What are the
.
various tests for finding the quality of sewage?
different types of sewage treatment?
-Contact beds
. Intermittent sand filters .
Trickling filters
. Miscellaneous type of filters
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by ripened sludge?
Ihe ripened
sludge is nothing but the digesled sludge is collected at the bottom
ofthe
figestion tank and it is alkaline in nature
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Mixing and stirring of raw
sludge with digested sludge
ere the types of incinerators has primary designed?
. Multiple hearth fumaces . Fluid bed fumace and infra red fumace
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the methods of aeration?
. Diftrsed air aeration . Mechanical aemtion . Combined aeration II
J)tfne percolation rate
Percolrtion rate is defined as the time in minuets required for sewage ofv/ater though that ground by one cm. 12.
What are the factors affecting the reduction ? . Temperature
. Turbulence effect of wind . Hydrographic
. Available dissolved oxygen . Rate ofre -aeration 13, rilhat is meant by sludge banks? When the solid waste are thrown into the sea water, chemical react with the dissolved matter sea water and resulting
in some precipitation of solid waste giving
a
of
milky appearace to sea
water forming the sludge banks. I 4. Erplain the
theory of oridation pond?
The oxidation pond is an excavation of rectangular ditch of shallow depth. The sewage is $orcd in this pond for a considerabte time. D,ring this period, the sewage is decomposed by rhe action
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../. of aerobic bacteria, algae and sunshine. That means, it is a natural metlod or
sewage treatment.
The aerobic bacteria absorb oxygen from the atnosphere for their'survival and break up the organic matters in sewage to simple stable compounds.
l5.State the Advantages & Disadvantages of oxidation pond. Advantaqes
It is a natural method of decomposition, so it is cheap Its operation and maintenance is sirnple
Itis highly efficient in removing B.O.D Disadvantages
large area is required for treatment
}
It creates bad smell and moiq'uito nuisance.
In rainy sanitary
season
or cloudy weather, the. sewage
condition
becomes septic and this may. cause in
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Uses
This system is suitable for small towns having tropical climate.
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