Halomethanes

Halomethanes, including methylene chloride, chloroform, and carbon tetrachloride (di-, tri-, and tetrachloromethane, respectively), are used mainly as raw materials and solvents in approximately 28 pesticide processes. Bromomethanes can be expected in at least five pesticides as raw materials, byproducts, or impurities and in the case of methyl bromide, can function as a fumigant.

Table 3 Summary of Raw Waste Load Design Levels.

Pollutant group Design level Detected pesticide wastewaters at design

Table 3 Summary of Raw Waste Load Design Levels.

Pollutant group Design level Detected pesticide wastewaters at design

(mg/L)

levela (%)

Volatile aromatics

127-293,000

24

Halomethanes

122-2,600

23

Cyanides

5,503

6.0

Haloethers

0.582

17

Phenols

100-42,000

45

Nitro-substituted aromatics

NDb

100

Polynuclear aromatics

1.06-1.2

25

Metals

Copper

4,500

17

Zinc

247

100

Chlorinated ethanes and

98-10,000

18

ethylenes

Nitrosamines

1.96

100

Phthalates

ND

100

Dichloropropane and

ND

100

dichloropropene

Pesticides

10-11,200

45

Dienes

2,500-15,000

50

TCDD

0.022

100

Miscellaneous

N/Ac

N/A

PCBs

N/A

N/A

Benzidine

N/A

N/A

BOD

1,470

33

COD

3,886

45

TSS

266

14

aRemainder of known pesticide wastewaters are below design level prior to biological oxidation. bND=not detected. cNA=not applicable. Source: Ref. 7.

aRemainder of known pesticide wastewaters are below design level prior to biological oxidation. bND=not detected. cNA=not applicable. Source: Ref. 7.

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