Effluent Treatment Plant
Waste
water produced
Sterilizer condensate
Sludge
Claybath water
At
milling capacity of 90 tan/hour, total quantity of waste water produced will be
Sterilizer condensate = 90 x
0,12 = 10,8 tan/hr
Sludge = 90 x
0,50 = 45 tan/hr
claybath water = 90
x 0,0005 = 0,045 tan/hr
Total = 58,845 tan/hr
Assume :
Retention time =
120 days
Average processing hours per
day = 20 hrs
Density of Effluent = 1000
kg/m3
Therefor,
total effluent pond capacity = 58,845 x 20 x 120
= 134028 tan
= 134028 x 40
= 5361120 ft³
=
5,360 x 10⁶ ft³
Design Of Pond
Anaerobic Pond 1 = 90’ x 300’ x 25’ = 945000 ft³
Anaerobic Pond 2 = 90’ x 300’ x 35’ = 945000 ft³
Anaerobic Pond 3 = 100’ x 320’ x 35’ = 1,12 x 10⁶
ft³
These
type of ponds are used for high strenght organic waste water that also contain
a high consentration of solid and of it is first or primary treatment that
receive raw waste water. It have a sludge layer which is responsible through
anaerobic methane fermentation far up to 30% of the BOD removal accurring in
the pond. The Anaerobic process basically degrades the complex organic to
simpler molecule.
Anaerobic Pond 4 = 100’
x 400’ x 15’ = 6,0 x 10⁵ ft³
Anaerobic Pond 5
= 100’ x
320’ x 20’ = 6,4 x 10⁵ ft³
Anaerobic
Pond 6 = 100’ x 320’ x 20’ = 6,4 x 10⁵
ft³
Aerobic
ponds are large, shallow earthen basins that are used for the treatment of
wastewater by natural process imvolving the use of bath algae and bacteria. The
efficiency of BOD conversion in Aerobic ponds is high especially at the top
layers of water where the oxygen diffusion is maximum. It is however although
the soluble BOD has been removed from the effluent waste water, the pond
effluent will contain equivalent or larger concentration of algae and bacteria
and thus various means must be devised to removed than.
Final discharge pond = 90’ x 300’
x 10’ = 2,7 x 10⁴ ft³
Effluent
is direcly applied to field through submerged pipe along oil palm tress.
