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A total of 49 effluent quality parameters are specified for the RO product water, but not all must be routinely monitored because many are expected to be consistently below the specified values as long as design influent values are not exceeded and membrane integrity is maintained as demonstrated by compliance with critical control points. Table 8 summarizes performance for the parameters routinely monitored and generally demonstrates routine compliance with the required performance.

Table 8

RO product water quality compared to required quality for 12 January through 22 October 2012

Required
Actual
ParameterUnitsAverageMaximumAverageMaximum
Escherichia coli #/100 mL NE 10 
Ammonia (as N) mg/L 0.025 0.059 0.095 0.55a 
Calcium mg/L 1.66 1.8 1.53 2.94 
Chlorine residual mg/L NE 1.94 0.0 
Colour, 465 nu Pt Co NE 100 2.9 29 
Dissolved organic carbon mg/L 12.9 14.4 1.53 11.4 
Fluoride mg/L NE 0.75 0.005 0.04 
Magnesium mg/L 1.66 1.8 0.39 0.87 
Organic nitrogen mg/L NE 0.73 0.54 0.91 
pH (Lab)  NE 6.0 to 9.0 6.92 9.21 
Potassium mg/L 1.1 1.1 0.33 1.25 
TP mg/L NE 0.1 0.001 0.010 
Sodium mg/L 7.8 8.4 7.41 54.3 
SUVA (254 nm) m-L/mg 4.6 4.7 1.3 6.5 
Temperature deg C NE 22 17.3 22.9 
TDS mg/L NE 200 41 63 
TN mg/L NE 0.72 1.20 
TOC mg/L NE 18 1.53 11.4 
UV absorbance (254 nm) 1/cm 0.595 0.651 0.011 0.106 
Required
Actual
ParameterUnitsAverageMaximumAverageMaximum
Escherichia coli #/100 mL NE 10 
Ammonia (as N) mg/L 0.025 0.059 0.095 0.55a 
Calcium mg/L 1.66 1.8 1.53 2.94 
Chlorine residual mg/L NE 1.94 0.0 
Colour, 465 nu Pt Co NE 100 2.9 29 
Dissolved organic carbon mg/L 12.9 14.4 1.53 11.4 
Fluoride mg/L NE 0.75 0.005 0.04 
Magnesium mg/L 1.66 1.8 0.39 0.87 
Organic nitrogen mg/L NE 0.73 0.54 0.91 
pH (Lab)  NE 6.0 to 9.0 6.92 9.21 
Potassium mg/L 1.1 1.1 0.33 1.25 
TP mg/L NE 0.1 0.001 0.010 
Sodium mg/L 7.8 8.4 7.41 54.3 
SUVA (254 nm) m-L/mg 4.6 4.7 1.3 6.5 
Temperature deg C NE 22 17.3 22.9 
TDS mg/L NE 200 41 63 
TN mg/L NE 0.72 1.20 
TOC mg/L NE 18 1.53 11.4 
UV absorbance (254 nm) 1/cm 0.595 0.651 0.011 0.106 

aBold values represent measured values that exceed corresponding design values.

SUVA: specific UV absorbance.

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