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Results of raw grey water monitoring are summarized in Table 2, together with conventional domestic wastewater characteristics (Tchobanoglous et al. 2003). Table 2 reveals that the quality of light grey water generated from the student residence hall is compatible with weak conventional domestic wastewater. Exceptions are maximum COD, TSS and VSS, however all mean concentrations are below the characteristic concentrations for weak conventional domestic wastewater in terms of physicochemical parameters.

Table 2

Characteristics of raw grey water for the student residence hall

  Raw grey water
Conventional domestic wastewatera
UnitMinMaxMeannbWeakIntermediateStrong
COD mg/L 99 351 198 250 430 800 
sCOD mg/L 59 94 85    
BOD mg/L 54 85 67 110 190 350 
sBOD mg/L 18 24 20    
TSS mg/L 56 186 139 120 210 400 
VSS mg/L 50 110 94 95 160 315 
TKN mg/L 4.05 11.47 6.09 20b 40b 70b 
NH4-N mg/L 0.43 0.86 0.64 15 25 
TP mg/L 1.61 2.01 1.78 12 
PO4-P mg/L 0.57 0.92 0.75 
Total coliform cfu/100 mL   1.16 × 107 106–108 107–109 108–1010 
Fecal coliform cfu/100 mL   4.82 × 106 103–105 104–106 105–108 
E. coli cfu/100 mL   2.11 × 106    
Enterococcus cfu/100 mL      
  Raw grey water
Conventional domestic wastewatera
UnitMinMaxMeannbWeakIntermediateStrong
COD mg/L 99 351 198 250 430 800 
sCOD mg/L 59 94 85    
BOD mg/L 54 85 67 110 190 350 
sBOD mg/L 18 24 20    
TSS mg/L 56 186 139 120 210 400 
VSS mg/L 50 110 94 95 160 315 
TKN mg/L 4.05 11.47 6.09 20b 40b 70b 
NH4-N mg/L 0.43 0.86 0.64 15 25 
TP mg/L 1.61 2.01 1.78 12 
PO4-P mg/L 0.57 0.92 0.75 
Total coliform cfu/100 mL   1.16 × 107 106–108 107–109 108–1010 
Fecal coliform cfu/100 mL   4.82 × 106 103–105 104–106 105–108 
E. coli cfu/100 mL   2.11 × 106    
Enterococcus cfu/100 mL      

aTchobanoglous et al. (2003).

bn, number of samples.

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