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Table 1 G rey water characteristics and seasonal discharge pattern

From: Grey water pollutant loads in residential colony and its economic management

Grey water quality a (mg/l except pH)

Grey water organic load (kg/day)

Water quality parameters

Seasonal variation

Annual average

Season

Average flow rate basis

Maximum flow rate basis

pH

7.3 to 8.1

7.68

Monsoon

30.85 ± 13.59b

55.3 ± 35.28b

BOD

52 to 68.5

58.5

  

COD

252 to 319

277.5

  

Total solids

646 to 802

713

Winter

24.05 ± 12.37b

52.00 ± 33.43b

Total suspended solids

218 to 337

273.11

  

Total dissolved solids

392.0 to 495.25

439.89

  

Total carbon

206.2 to 221.0

208.4

Summer

33.31 ± 15.79b

83.34 ± 57.77b

Total nitrogen

33.5 to 42.0

38.26

  

Total phosphorus

7.9 to 8.72

8.31

  

Total potassium

3.5 to 3.85

3.6

Annual

29.44 ± 4.80b

62.71 ± 17.22b

  1. aAll values represent mean of triplicates. Standard deviations are given as ± the mean. bRepresents ANOVA (f-test) significance at 0.1%. Critical difference (CD) value for daily and seasonal variation recorded to be 1.86 and 6.55, respectively.