ETP System For Molasses Based Distilleries
have been generating huge quantities of high toxic effluents and in spite of
the best efforts made so far a comprehensive treatment has not been
possible. In most of the conventional technologies, the treated effluent
also yields very high BOD, COD, TS and TDS level with black colored and odor
effluent to rivers & natural water streams. Based on the above mentioned
fact, a treatment by which it will be possible to overcome all the problems
have been worked out. The basic thrust of the technology is to reduce the
quantity by a maximum possible extent. The concept and the treatment is
based on the belief that the entire BOD requirement should go down and the
condensate coming out should not be polluted.
Key Features of Multi Effect Evaporator System:
- Fully Customized Designed System
- Highest Steam Economy
- Lowest Operation & Maintenance Cost
- Operator Friendly
- Easily Upgradeable
- Generation of Reusable Condensate Water
Flow Diagram of Multi Effect Evaporation System
ZERO LIQUID DISCHARGE SECTION (FLOW)
Distillery Waste Water Handling By Evaporation And Drying
The technology is based on basic principle of reduction of
quantity by concentrating the effluent and subsequently drying it to a
Powder / Mixed Fuel form which can be used as an alternative fuel for
boilers and as an organic / inorganic fertilizer for plant growth.
The Evaporation Process:
Distillery Effluent is fed to the vacuum evaporator to
concentrate maximum up to 60% solids concentration. The total process is
under vacuum and the vapors generated in the system are re-used to economize
steam consumption. In order to reduce steam consumption in multiple effect
evaporation system the thermal vapour recompression system is used. The
thermal vapour recompression system use Vapours generated in the evaporator
and compress it by steam and the compressed vapours are used as heating
medium in the evaporator. Water recovered from the evaporator has low BOD
value and can be recycled in the plant.
THE DRYING PROCESS (ZERO LIQUID DISCHARGE SECTION):
The resultant slurry (concentrate) is fed to the drying
section for converting the liquid concentrate to powder / mixed fuel (mixing
with Secondary Fuel e.g. Bagasse, rice husk etc.) form. The air heated by
steam radiator or hot air generator is fed into the dryer. The whole system
is designed to obtain the optimum results. The emissions from the dryer are
within the norms specified by the Govt. of India. This powder / mixed fuel
can be used as an alternative fuel to steam boilers.
Main Thrust Of The Technology
The Basic thrust of the technology is to reduce the
quantity of Effluent by a maximum possible extent in the first stage.
In many of this kind of processes foaming is a big problem, which carries
away lot of suspended particles in the condensate water, which eventually
increases the BOD of distillate. The SSPs technology has taken care of
this problem and the BOD levels are contained to an extent of 80 mg/l and
the distillate produced is colorless and is reusable for other processes.
Key Features (General):
- ZERO Liquid Discharge
- Low Operating Cost
- User Friendly
- Easily Upgradeable
- Less Downtime for Maintenance
- Applicable for CDM Benefit
Zero Liquid Discharge System ( ETP ) For Grain Based Distilleries (DDGS
has designed and supplied DDGS plants to various parties in India as well as
abroad. In today's business scenario it is imperative for one to properly
address his attention on the economic and environmental aspects that concern
the grain-based alcohol producing industries in India vis-à-vis
processing of stillage obtained as the by-product after distillation.
SSP is the pioneer in India to have indigenously developed a proven, fully
integrated technology for manufacturing Distillers Dried Grains with
from whole grain stillage which is the residue obtained
after alcohol has been separated by distillation of the fermented mash of
feed stock and water.
SCHEME FOR ZERO LIQUID DISCHARGE SYSTEM ( ETP ) FOR GRAIN BASED
The zero discharge system for grain based distillery effluent handling
(DDGS Plant) consists of following main processes.
- Decantation System : To separate the suspended particles and
- Evaporation System : To concentrate the thin liquor in vacuum
- Mixing & Blending System : To mix the Wet cake and the
- Spin Flash Drying : To dry the mix to get dried powder
THE PROCESS (DDGS) :
The grain stillage from the bottom of analyzer column of
grain based distillery is introduced to a continuous decanter centrifuge.
Suspended particles are separated as a wet cake from the decanter and thin
liquor is further processed to the evaporation section.
The thin liquor from decanter is concentrated in multiple effects falling
film vacuum evaporator to get maximum water evaporation per kg steam energy
supplied. The total process is under vacuum and the vapours generated in the
system are re-used to economize steam consumption. In order to reduce steam
consumption in multiple effect evaporation system the thermal vapour
recompression system is used. The thermal vapour recompression system use
vapours generated in the evaporator and compress it by steam and the
compressed vapours are used as heating medium in the evaporator. The
concentrate obtained from the evaporator is stored and fed to the mixing
section. The wet cake and the concentrate is mixed and blended to for a
uniform mix. The so formed mix is fed to the spin flash dryer to dry the wet
mix to get dried powder DDGS. Fraction of DDGS at 10% moisture content is
re-circulated through the blending section so to reduce the water
evaporation load on spin flash dryer.
The DDGS thus obtained is a high protein content product and can be used as
catlle feed of good nutritional value.