DYEING & PRINTING WASH WATER TREATMENT

DYEING & PRINTING WASH WATER TREATMENT:

1. Holding Tank: Wash water is collected in holding tanks
2. FM, FLOC, Tube Settler Module: From Holding tank wash water is pumped to chemical treatment unit consisting of Flash Mixer, Flocculator and Tube Settler where lime and ferrous sulfate are added by auto doser in required quantity with effluent and allowed for settling.
3. FILTERS: The chemically treated water is stored in a bleach tank and pumped through pressure sand filter followed by activated carbon filter.
4. For zero discharge conditions: 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/cm2 .Rejects of first RO is sent to second RO and the final reject (20%) is sent to Multiple Effect Evaporator (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.

Saleem Asraf Syed Imdaadullah
Mobile : 9899300371
311/22,Zakir Nagar,New Delhi-110025
email: saleemasraf@gmail.com
BLOG: http://saleemindia.blogspot.com

Design of V notch for discharge measurement

 

 

Installation Guidelines for V notch

 

 

 

 

• Use a 2mm Thick Mild Steel plate to make the V notch. Make a 90^o V

• Water surface downstream of the weir should be at least 6 cm below the bottom of the V to allow a free flowing waterfall.

• The bottom of the "V" only needs to be 10 cm (=P) above the bottom of the upstream channel,
• the approach channel (=B) only needs to be 2 ft. wide,

• Head (h) should be measured at a distance of at least 4h upstream of the weir.

 

Q = 4.28 C tan(θ/2)( h+k)^5/2

 

where

Q = flow rate (cfs)

C= Discharge Coefficient, C=0.578 for 90^o V notch

θ = v-notch angle ( 90^o

h = head on the weir (ft)

k = Head Correction factor(Ft)

• k (ft.) = 0.0144902648 - 0.00033955535 Ø + 3.29819003x10^-6 ز - 1.06215442x10^-8 س
  where Ø is the V notch angle in degrees ( 90^o

 

 

Source: ENVO PROJECTS. NEW DELHI-25 9899300371, 9810004529

Saleem Asraf Syed Imdaadullah
Mobile : 9899300371
311/22,Zakir Nagar,New Delhi-110025
email: saleemasraf@gmail.com
BLOG: http://saleemindia.blogspot.com

latest technology dye waste water treatment ZERO discharge

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

Saleem Asraf Syed Imdaadullah
Mobile : 9899300371
311/22,Zakir Nagar,New Delhi-110025
email: saleemasraf@gmail.com
BLOG: http://saleemindia.blogspot.com