Table 23 Schedule VI of Environment Protection Third Amendment Rules 1993 [69

Standards®

Serial No.

Parameters

Inland surface Public Land for water__sewers irrigation Marine coastal areas

1 Color and odor

2 Suspended solids (mg/L), max

3 Particle size of suspended solids

Shall pass 850 micron IS sieve

4 pH value

5 Temperature

7 Total residual chlorine (mg/L), max

Should not exceed 5°C above the receiving water temperature 10

200 (a) For process waste water, 100 (b) For cooling water effluent 10% above total suspended matter of influent

— (a) Floatable solids, solids max. 3 mm (b) Settleable solids, max.

856 microns 5.5-9.0

— Should not exceed 5°C above the receiving water temperature

10 20

9 Total Kjeldahl

100

100

nitrogen (as N)

(mg/L), max

10 Free ammonia (as

5

5

NH3) (mg/L),

max

11 Nitrate nitrogen

10

20

12 BOD5 (mg/L),

30

350

100

100

max

13 COD (mg/L), max

250

250

14 Arsenic (as As)

0.2

0.2

0.2

0.2

(mg/L)

15 Mercury (as Hg)

0.01

0.01

0.01

(mg/L), max

16 Lead (as Pb)

0.1

0.1

2

(mg/L), max

17 Cadmium (as Cd)

2

1

2

(mg/L), max

18 Hexavalent

0.1

2

1

chromium (as

Cr6+) (mg/L), max

19 Total chromium

2

2

2

(as Cr) (mg/L),

max

20 Copper (as Cu)

3

3

2

(mg/L), max

Inland

Serial

surface

Public

Land for

Marine

No. Parameters

water

sewers

irrigation

coastal areas

21 Zinc (as Zn) (mg/L), max

5

15

15

22 Selenium (as Se) (mg/L),

0.05

0.05

0.05

max

23 Nickel (as NO (mg/L), max

3

3

5

24 Cyanide (as CN) (mg/L),

0.2

2

0.2

0.2

max

25 Fluoride (as F) (mg/L), max

2

15

15

26 Dissolved phosphates (as P)

5

(mg/L), max

27 Sulfide (as S), (mg/L)

2

5

28 Phenolic compounds (as

1

5

5

C6H5OH) (mg/L), max

29 Radioactive materials

(a) Alpha emitters (micro-

10-7

10-7

10-8

10-7

Curie mg/L), max

(b) Beta emitters (micro-

10-6

10-6

10-7

10-6

Curie, mg/L), max

30 Bio-assay test after 96 hours

90% survival 90% survival

90% survival

90% survival

in 100% effluent

of fish

of fish

of fish

of fish

31 Manganese (as Mn) (mg/L),

2

2

2

2

max

32 Iron (as Fe) (mg/L), max

3

3

3

3

33 Vanadium (as V) (mg/L),

0.2

0.2

max

aThese standards shall be applicable for industries, operations, or processes other than those industries, operations, or process for which standards have been specified in Schedule I. bAll efforts should be made to remove color and unpleasant odor as for as practicable.

aThese standards shall be applicable for industries, operations, or processes other than those industries, operations, or process for which standards have been specified in Schedule I. bAll efforts should be made to remove color and unpleasant odor as for as practicable.

Based on extensive study and experience in treatment of pharmaceutical wastewater, the following specific conclusions may be drawn:

• Pretreatment of pharmaceutical industry wastewater such as air stripping and coagulation is not beneficial; however, sedimentation of treated effluent was found effective in further reduction of SS and COD of the effluent. Hence, the pretreatment of pharmaceutical wastewater is not advisable.

• In many cases, anaerobic filter treatment was found to successfully treat pharmaceutical industry wastewater. This can be an excellent alternative for conventional aerobic treatment, which is energy intensive and requires the disposal of sludge. The anaerobic filter, on the other hand, can produce energy in the form of biogas and does not require sludge disposal. Moreover, the anaerobic filter is more resistant and capable of handling shock loading as compared to the aerobic system.

• All waste streams, with the exception of acid waste streams of a synthetic drug factory, must be treated collectively rather than treated separately, as the performance efficiency of combined waste has been proved to be better than that of waste treated separately. Moreover, the segregation of acid waste streams could result in the following benefits:

- recovery of useful acids from the waste;

- the volume of the waste needing neutralization has been reduced to 50% and has eliminated the necessity of adjusting the pH of the combined waste for biological treatment;

- the burden on the biological treatment has been reduced.

• The problem of sludge bulking in the case of the activated sludge process can be controlled in the following ways:

- chlorination of the mixed liquor;

- operating the system at minm DO concentration of 3 mg/L;

- operating the system at higher organic loading.

• Treatment processes such as ASP, PAC-ASP, GAC, and resin columns can successfully remove priority pollutants from pharmaceutical wastewater.

• In general, the trickling filter and activated sludge were found to satisfactorily cope with the needs of wastewater treatment for the pharmaceutical industry.

• Addition of PAC in the activated sludge process was found beneficial in improving the effluent quality, but it cannot be recommended until the problem of viscous layer formation is solved.

3.10 DESIGN EXAMPLES

Example 1

A synthetic organic chemicals plant discharges mainly two types of waste streams, namely strong process waste and dilute process waste. The flow and BOD5 of the waste

Type of wastes

Flow (GPD)

BOD5 (mg/L)

Strong process waste

11,800

480,000

Dilute process waste

33,800

640

GPD, gallons per day; BOD, biochemical oxygen demand.

GPD, gallons per day; BOD, biochemical oxygen demand.

In addition, the plant discharges 35,300 GPD service wastewater. If the total BOD load of the composite waste is 47,500 lb/day, estimate (i) the BOD5 of the composite waste and domestic waste; and (ii) the BOD load of the each stream and their contribution to the total BOD load of the plant.

Solution

Determine the BOD5 of the wastes. The first step is to find out the total flow of the composite waste by summing the flow of the various waste streams of the plant. Total flow of the composite waste=11,800+33,800+35,300=80,900 GPD

BOD load due to domestic waste=47,500-(47,262.43+180.5) 57.05 lb/day

H<JD toad (Itf/day} X 45j.fi (g/Lb) x 1000 fjgt/jj)

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