Posted by Textile Fashion Guide: A Dedicated Textile Fashion Education Informations Blog
I
have already posted about the process flowchart of ETP – Effluent
Treatment Plant. But it was too much shot and contained only the process
name. Now I am describing each section of these.
h2>Primary Filtration of Waste Liquor
Waste liquor after pretreatment, dyeing, printing and finishing is
subjected to primary filtration, in which removal of gross solids, such
as waster threads, fabric pieces, lint’s, etc, takes place.
Cooling & Mixing
After primary filtration, the liquor passes to cooling and mixing
tank in which uniform mixing of effluents from various process takes
place. A paddle mixer is provided for mixing. Cooling of the effluent
may be done with the help of cooling tower.
Neutralization
The effluent is pumped to a tank in which it is neutralized by acid
or alkali dozing. The tank has an automatic dosing controller which at
automatically control the dose of acid or alkali to maintain the
required PH .
Co-Agulation
Then the effluent is pumped to the co-agulation tank. Chemical
co-agulation very effective for removal of color and suspended
materials, aluminum, ferrous sulphates, ferric chloride, chlorinate
dcopper etc. to increase the efficiency of co-agualtion, co –agulation
gain may be added for example polyacrylate.
Setting & Separation of Sludge
Some of the soluble organic matter and light suspended solids will
form a blanket of flocculent matter with the co-agulants. The blanket is
skimmed of to another tank and the remaining solution is moved to
pressure filter.
Pressure Filter
For pressure filtration vacuum pumps may be used to force through the
filter and suspended flocks are collected in the pressure fine filter.
Discharging to Drain
After filtration the purified water sent to drain which eventually reach to the river or anywhere else.
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