Page 239 - Membranes for Industrial Wastewater Recovery and Re-Use

208 Membranes for Industrial Wastewater Recovery and Re-use

Table 4.11 Proposed water network to achieve the target set for Scenario 1
From To Flow (t/d)
From process. .. .. .toprocess
Cooling out Dyeing in 248.50
Cooling out Final hot washing in 1.50
Cooling out Desizing in 100.00
Prewashing out Maintenance in 44.87
Dyeing out Maintenance in 13.26
Final hot washing out Prewashing in 50.00
Final cold washing out Prewashing in 11.60
Maintenance out Maintenance in
From utility. .. .. .toprocess
Fresh water Steam production in 100.00
Fresh water Cooling in 350.00
Fresh water Prewashing in 88.40
Fresh water Bleaching in 50.00
Fresh water Dyeing in 51.50
Fresh water Final cold cleaning in 200.00
Fresh water Maintenance cleaning in 65.76
Fresh water Mercerising in 50.00
Fresh water Printing In 60.00
UF for size recover clean Maintenance in 25.84
Evaporation for alkali recovery clean Final hot washing in 48.50
Fromprocess ... ... to utility
Steam production out Discharge to sewer 100.00
Prewashing out Discharge to sewer 105.13
Bleaching out Discharge to sewer 3.09
Bleaching out Centralised WWTP 46.91
Dyeing out Discharge to sewer 97.09
Dyeing out Centralised WWTP 189.65
Final cold cleaning out Discharge to sewer 188.40
Maintenance out Discharge to sewer 149.73
Desizing out UF for size recovery inlet 100.00
Mercerising out Evaporation for alkali recovery in 50.00
Printing out Membrane for printing paste in 60.00
From utilitpj. .. ... to utility
UF for size recover clean Discharge to sewer 61.16
UF for size recover duty Recovered product 13.00
Evaporation for alkali recovery dirty Recovered product 1.50
Membrane for printing paste clean Discharge to sewer 54.00
Membrane for printing paste dirty Centralised WWTP inlet 6.00
Centralised WWTP clean Discharge on sewer 218.30
Centralised WWTP dirty Dirty discharge 24.26

From the author’s own observation, it appears to be more productive to start
with initial conditions which are randomly selected, thus not necessarily close to
the optimum.
The water pinch methodology described in Sections 4.2.1-4.2.4 was
restricted to targeting the minimum flow rate reusing effluent streams without
prior treatment. The methodology, however, also allows the identification of
those processes for which treatment of the effluent prior to reuse should be