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Frequently
Asked Questions:______________________________________
Frequently Asked Questions on Integrated Evaporator
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Answers
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Why
concentrate the spent wash?
Central
Pollution control board is insisting on zero discharge.
Since it is still not achieved by any
Technology Provider, the minimum thing being asked
from distilleries is to implement
continuous fermentation and recycle water
by reducing the Quantity of spent wash by implementing
either RO or Multiple effect
evaporation technology. The evaporation
method being more beneficial in long run compared to
RO due to very low maintenance cost
(replacement of membranes after 1 year
of operation). Top
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Why
not only compost?
Composting needs large area of land and Press mud as
filler material which is in short supply .The Sugar
mills themselves
are consuming their press mud in their own distilleries.
There is always a question regarding over feeding of
spent wash to the available filler material. This excess
spent
wash seeping into the ground and eventually mixing
in the nearby potable water sources. Local PCB’s
hence monitor area around composting area. Top
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To
what extent Spent wash should be concentrated?
If composting is to be done it can be done up to 30% spent
wash concentration irrespective of whether it’s raw
or biomethanated. If it’s to be burnt it should be
60 to 65%. Top
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Is
Initial solid content is of any importance?
The evaporator is sized for water evaporation and solid
content, viscosity, isoelectric pH, temperature for separation
of scale forming solids. This includes amount of Calcium
and Silica as primarily scale forming substances.If the
initial solids are low Evaporator initial cost increases. Top
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Whether
Evaporator will work on spent wash?
This was the question often raised due to a long history
of many failed attempts to concentrate the spent wash.
The main reasons of failure were the parameters refer to
in earlier question were totally ignored apart from the
fact the evaporators designed then were not made by Evaporator
manufacturers with extensive experience on handling diverse
type of liquids. Mojj by virtue of having extensive professional
experience in evaporation of many zero discharge plants
for Pharmaceutical and chemical industries and having experience
on evaporation of many valuable pure substances could design
and successfully implement evaporation in the first plant. Top
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Whether
evaporator will work on Raw Spent Wash?
It will
and it is working .The special feature of raw spent wash
is it’s solid content (Typically
10 to 13 %)and acidic pH(Typically 3.5 to 5.5).We are operating
one successfully
for last 2 years without ant requirement of any cleaning
in place. The important key to success is selection of
correct material for tubes, Welding methods, and selection
of concentration in each stage. Raw spent wash is by far
the trickiest substance to concentrate exceptioned only
by other polymerizing organics encountered in Bio Technology/Pharma
sector companies. Top
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Whether
evaporator will work on Biomethanated spent wash?
It will certainly work; It is much simpler as the solid
content is to start with is lower as also the pH is neutral.
As long as care is taken to remove dissolved gaseous
phases like CO2/H2S to minimum by carefully designed
flash separators prior to entering the Calendria there
is no other problem. Top
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Whether
integrated evaporator is at all possible?
This question was always raised to our first customer
by the competition as they could not do the same to create
fear and divert the order to them at the same old technology.
This question is not raised now but now they are also
claiming they can also offer the same. The interpretation
of integration is use of stand alone evaporator .The
main points claimed and proved by us of reducing steam
consumption drastically and absolutely no CIP requirement
is not achieved by any competitor. Top
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Whether
Integrated Evaporator will affect distillation stability?
No, as long as the design is correct. Top
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What
about continuity of operation due to scaling?
We guarantee 100% scale free operation of the integrated
evaporator. Top
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What
about Quality of Alcohol with an integrated evaporator?
Quality
of Alcohol does not change. Top
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What
about corrosion/ erosion of tubes in Raw/ Biomethanated
Spent wash?
There is no corrosion/erosion. Top
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Whether
dissolved CO2 and H2S will make evaporation impossible?
It is essential to remove CO2 and H2S prior to evaporation. Top
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What
about H2S corrosion?
No
effect in case it is removed earlier. Top
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Why
unnecessarily complicate the main business of distillation?
The compulsion of zero discharge and prudence of reducing
operating cost necessitates evaporation at some stage
of post distillation operation. Top
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What
about suspended solids in Biomethanated spent wash?
They have to be filtered out as much as possible.
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What
happens to heat recovery in the conventional beer heater?
Recovery remains unchanged. Top
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Since
now integrated evaporator is working on raw spentwash
,whether it will work on Biomethanated spent wash?
It will work with degassing and filtration. Top
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Whether
it will run on my spent wash? (Since molasses quality
is different in different areas/factories)
It will run on any spent wash. Top
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Whether
it can be retrofitted in a running distillery at a later
date?
It can be retrofitted at a later date. It can be retrofitted
on existing atmospheric/Multipressure plants also. Top
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