Effluents are segregated into dye bath wastewater and wash water and treatment is effected
accordingly.
Wash water is collected in holding tanks and pumped to primary treatment unit (lime and
ferrous sulfate slurries are flash-mixed with effluent and allowed for settling). Following
primary treatment the effluent is carried to pressure sand filter, iron removal filter, ion
exchange filter and reverse osmosis (RO) system. Double stage RO system (each with six
membranes) with spiral wound membrane is in operation. Pump pressure is maintained in
the range of 21.2–28.2 kg/cm
2
. Rejects of first RO is sent to second RO and the final reject
(20%) is sent to MEE. Condensate water is recycled in the cleaning operations. Outlet with
100 g/L solid content is allowed for solar evaporation and the combined permeate is used in
the process. Dye bath water is collected in a separate tank and are subject to nanofiltration
after following pre-filtration. Total reject of about 30% is sent for multi effect evaporation
and solar evaporation systems. The permeate is used for preparation of dye bath solution
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311/22,Zakir Nagar,New Delhi-110025
email: saleemasraf@gmail.com
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