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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.