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Depending upon where it is collected from, grey water may also be segregated in two fractions: light grey water from baths/showers and washbasins with a lower pollution potential, and dark grey water from sinks, dishwashers and washing machines with a higher level of pollution (Birks & Hills 2007). Light grey water makes up about 30–40% of the entire grey water stream, which more or less corresponds to the flush water use in Turkey (Giresunlu & Beler Baykal 2014), which was calculated from mass balances based on unit water use expected for various household functions and habits of a typical Turkish household. According to Table 1, which shows some typical characteristics of grey water, the pollution potential of mixed grey water is higher compared with the light fraction. A survey of the table reveals that the level of nutrients are low, however organic matter is high. The primary concern in grey water treatment is organic matter (Al-Balawenah et al. 2010), however a fast survey of Table 1 also reveals that microbiological indicator concentrations are considerable.

Table 1

Typical grey water characteristics

  Mixeda
Light
UnitHousebHousecStudent residence halld
COD mg/L 245 112 96 
sCOD mg/L 177 29  
BOD mg/L 90 78 46 
sBOD mg/L   31 
TSS mg/L 48 37 39 
VSS mg/L 39   
TKN mg/L 5.4e 4.6 
NH4-N mg/L    
TP mg/L 7.3 0.2 0.9 
PO4-P mg/L    
pH     
Turbidity NTU  49.5 26 
Total coliform cfu/100 mL 1.36E + 04  2.20E + 08 
Fecal coliform cfu/100 mL 3.57E + 03   
E. coli cfu/100 mL  3.00E + 04 3.90E + 05 
Enterococcus cfu/100 mL  8.50E + 03 2.50E + 03 
  Mixeda
Light
UnitHousebHousecStudent residence halld
COD mg/L 245 112 96 
sCOD mg/L 177 29  
BOD mg/L 90 78 46 
sBOD mg/L   31 
TSS mg/L 48 37 39 
VSS mg/L 39   
TKN mg/L 5.4e 4.6 
NH4-N mg/L    
TP mg/L 7.3 0.2 0.9 
PO4-P mg/L    
pH     
Turbidity NTU  49.5 26 
Total coliform cfu/100 mL 1.36E + 04  2.20E + 08 
Fecal coliform cfu/100 mL 3.57E + 03   
E. coli cfu/100 mL  3.00E + 04 3.90E + 05 
Enterococcus cfu/100 mL  8.50E + 03 2.50E + 03 

aMixed refers to grey water generated from wash basins, bathtubs/showers together with kitchen sinks.

bAtasoy et al. (2007).

cChaillou et al. (2011).

dBirks & Hills (2007).

eTotal nitrogen.

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