Table 1 Conventional Color Photoprocessing Effluent Characteristics

__Typical concentration (mg/L or as noted)_

Parameter

Temperature 80-110°F

bod5

200-3000

COD

400-5000

TDS

300-3000

TSS

<5 to 50

Phenolic compounds

None

Flammable; explosive

None

Detergents

Minimal

Oils and grease

None

NH3-N

20-300

TKN

30-350

Thiosulfate

100-1000

Sulfate

50-250

Metalsa

Silverb

<5

Cadmium

<0.02

Chromium

<0.05

Iron

10-100

Lead

<0.02

Mercury

< 0.0002

Nickel

<0.02

Zinc

<0.02-0.75

a Certain metals, including some of those listed and others, may be detected in trace amounts in photographic effluents even though they are not part of the photographic process, because they appear as contaminants coming from equipment, plumbing, and so on. bAfter silver recovery (see Section 6.4.3). If iron replacement techniques are used for silver recovery, higher iron levels may be present.

BOD5, five-day biochemical oxygen demand; COD, chemical oxygen demand; TDS, total dissolved solids; TSS, total suspended solids; TKN, total Kjeldahl nitrogen.

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