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Answers
of short type questions.
1.
In
developing countries most food is lost at production stages.
2.
In
developed countries most food is lost at consumption Stages.
3.
In
developed countries about 100 Kg kilogram of food is wasted per person per
year.
4.
Main types
of Food Waste are liquid waste
and solid waste.
5.
Normally-used
BOD test procedure requires five
days sample incubation period.
6.
pH range for neutral
is 7.
7.
pH range for basic is 7 to 14.
8.
pH range for acid is 0
to 7.
9.
pH of food processing waste
water ranges from 3.5 to 11.5
.
10.
The
generally recommended ratio of BOD to total N to total P is 100 : 05 : 01.
11. When industrial effluents are allowed for disposal
into water courses the max. BOD limit is 100 mg/ltr.
12. When Industrial effluents are discharge on land
for irrigation purposes the max. BOD limit is 500 mg/ltr.
13.
Full form of BOD is biochemical oxygen demand.
14.
Full form of COD is chemical oxygen demand.
15.
Full Form of TOD is total oxygen demand.
16. Full form of TSS is total
suspended solids.
17.
Full form of TDS is total dissolved solids.
18.
Full form of RRR is reduce, reuse, recycle.
19.
%age of BOD removed by primary
treatment of waste water is 25
to 50%.
20.
%age of COD removed by primary
treatment of waste water is …………..
21.
%age of suspended solids
removed by primary treatment of waste water is 50 to 70%.
22.
%age of oils and grease removed
by primary treatment of waste water is 65%.
23.
Chemical used in coagulation is alum.
24.
Chemical used in flocculation
is polyelectrolyte.
25.
In the aeration tank of
activated sludge process usual retention time is 3 to 8 hours Hrs.
26.
General depth of oxidation
ditch is 0.9 to 1.5 m Mtr.
27.
Activated carbon is activated
by steam at a temperature 800°C
and 1000°C.
28.
Activated carbon is activated
by chemical at a temperature 500°C
and 800°C.
29.
Chemical used for activation of
carbon is phosphoric acid (P2O5) or
zinc chloride (ZnCl2).
30.
Full form of RRR in waste
management is reduce, reuse,
recycle.
31.
Waste water is evaporated at a
temperature range of 103 to 105 degree Celsius to determine total solid
content.
32.
To calculate fixed residue
content the waste solid is burned in muffle furnace at temp 550 degree Celsius for 15 to 30 minutes.
33.
Total soluble solids increase
the turbidity of
the receiving water.
34.
pH requirement of waste water
is 5.5 to 9 for discharge to environment.
35. Normally-used BOD test procedure requires five
days sample incubation period at temp 20°C.
36.
Excess of sulfur content can
cause the problem of bad odor
in waste water.
37.
Normally-used BOD test
procedure requires five days sample incubation period at temp 20°C.
38.
Environment
protection act was passed in the year of 1986.
39.
Methyl
isocyanate gas was leaked in Bhopal gas tragedy.
40. General depth of oxidation ditch is 0.9 to 1.5 m Mtr.
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