Para   meter

Physico- chemical-treated effluent

After ozonation

Conductivity
(uScm-1)

850–950

Same

pH

7–7.5

Same

Suspended particulate matter
(mg/L)

22

9

BOD5
(mg/L)

41

39

DOC
(mg/L)

95

79

Turbidity
(NTU)

13

8

C     oliforms (thermotolerant)
x 106 fc/100 mL

3.8 x 106

4.0x102

BOD5: biochemical oxygen demand (5%); DOC: dissolved organic carbon
Table 1: Physical and chemical characteristics of City of Montreal wastewater effluents.