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Table 1     The permissible discharge trial concentration for the first category of pollutants ( unit:mg/litre)

Number

Pollutants

Grade 1

Grade 2

1

total mercury

0.05

0.05

2

total cadmium

0.1

0.1

3

sexavalence chromium

0.5

0.5

4

total arsenic

0.5

0.5

5

lead

1.0

1.0

Table 2    The permissible discharge trial concentration for the second category of pollutants(unit:mg/litre)

Number

Pollutants

Grade 2

Grade 3

1

PH value

6-9

6-96

2

Suspended matter

70

hydrauli ash, washouts,coal washing water , and etc.

300

Others

100

3

Biochemical oxygen demand(BOD)

30

pulping and papermaking,leather making

100

others

50

4

chemcial oxygen demand

100

pulping and paper-making

300

letter-making

200

others

125

5

chrominance(multiple)

40

60

6

ammoniacal nitrogen

10

15

7

sulfide

1.0

1.0

8

valatile phenol

0.5

0.5

9

lyanogen compounds

0.5

0.5

10

organic phosphorus farm chemical

0.5

0.5

11

petroleum

10

10

12

copper

1.0

1.0

13

zine

5.0

5.0

14

fluoride

10

10

15

nitrooenzene

3.0

5.0

16

aniline

2.0

3.0

17

benzene series

2.6

3.0

Table 3   Environmental noise criteria in Yangzhou urban district(unit:db(A))    

District

1

2

3

4

Day

55

60

65

70

Night

45

50

55

55

Table 4   Boiler and atmosphere pollutant effluent standard(unit:mg/Nm³)

Number

Pollutants

Class 2

Class 3

1

Fly Ash

250

350

2

SQ

12

1260