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Table 2

Basic situation of river water system in the development zone (mg/L)

Parameter	Standard values
Parameter	Class I	Class II	Class III	Class IV	Class V
pH	6–9 (dimensionless)
DO	7.5	6	5	3	2
COD_Mn	2	4	6	10	15
COD_Cr	15	15	20	30	40
BOD₅	3	3	4	6	10
NH₃-N	0.15	0.5	1	1.5	2.0
TP	0.02	0.1	0.2	0.3	0.4
Fluoride	1.0	1.0	1.0	1.5	1.5
Valatilephenol	0.002	0.002	0.005	0.01	0.1
Petroleum	0.05	0.05	0.05	0.5	1
Sulfide	0.05	0.1	0.2	0.5	1.0

Parameter	Standard values
Parameter	Class I	Class II	Class III	Class IV	Class V
pH	6–9 (dimensionless)
DO	7.5	6	5	3	2
COD_Mn	2	4	6	10	15
COD_Cr	15	15	20	30	40
BOD₅	3	3	4	6	10
NH₃-N	0.15	0.5	1	1.5	2.0
TP	0.02	0.1	0.2	0.3	0.4
Fluoride	1.0	1.0	1.0	1.5	1.5
Valatilephenol	0.002	0.002	0.005	0.01	0.1
Petroleum	0.05	0.05	0.05	0.5	1
Sulfide	0.05	0.1	0.2	0.5	1.0