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The greywater reuse options and criteria used in decision-making are presented in Table 9. Treatment cost (TRC) indicates the cost of treatment of GW per million liters/d (MLD) flow. Treatment cost is a theoretical estimation that includes cost of construction, chemicals, energy, and manpower on an annualized basis. Treatment units were designed for a flow of 240 L/d, keeping in view the test conditions in the present study, and the TRC was worked out. Further, the TRC was converted to per MLD flow.

Table 9

Greywater reuse options and criteria used for comparison using AHP

 TRCABΔpHTUREC25TSSO&GBOD5BoronSARFC
OptionUS$/MLDNTUμS/cmmg/Lmg/Lmg/Lmg/LLog10#
Option 1 532 4.0 0.24 4.5 465 15 28 0.01 2.00 0.301 
Option 2 9,249 6.0 0.44 0.9 495 11 0.01 1.50 0.301 
Option 3 9,897 7.5 0.37 0.6 520 0.01 2.35 0.301 
Option 4 3,703 7.0 0.54 2.3 523 15 0.01 2.15 0.301 
 TRCABΔpHTUREC25TSSO&GBOD5BoronSARFC
OptionUS$/MLDNTUμS/cmmg/Lmg/Lmg/Lmg/LLog10#
Option 1 532 4.0 0.24 4.5 465 15 28 0.01 2.00 0.301 
Option 2 9,249 6.0 0.44 0.9 495 11 0.01 1.50 0.301 
Option 3 9,897 7.5 0.37 0.6 520 0.01 2.35 0.301 
Option 4 3,703 7.0 0.54 2.3 523 15 0.01 2.15 0.301 

# MPN/100 mL.

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