Pollutants

Limiting pathway

Pollutant limit
 mg kg-1

Conc. in sludge, µg kg-1

1970s†

1980s‡

Aldrin/Dieldrin

Adult eating animal products

2.7

6.4 (16%)¶

1.9 (3%)

Benzo(a)pyrene

Child eating biosolids

15

138 (21%)

  - (3%)

Chlordane

Child eating biosolids

86

6.4 (16%)

  - (3%)

DDT§

Adult eating fish/drinking water

120

- (0%)

  - (0%)

Heptachlor

Adult eating animal products

7.4

6.4 (16%)

  - (0%)

Hexachlorobenzene

Adult eating animal products

29

155 (16%)

  - (0%)

Hexachlorobutadiene

Adult eating animal products

600

23 (5%)

  - (0%)

Lindane

Child eating biosolids

84

6.4 (16%)

  - (0%)

Dimethylamine

Child eating biosolids

2.1

57 (5%)

  - (0%)

Toxaphene

Adult eating animal products

10

6.4 (16%)

  - (0%)

Trichloroethylene

Child eating biosolids

10000

8139 (84%)

  - (1%)

†Averages for sludge in 40 cities in the late 1970s.
‡Averages from the National Sewage Sludge Survey conducted in the late 1980s.
§Dichlorodiphenyl trichloroethane
¶Numbers in parentheses are the percentage of wastewater treating plants in which a compound was detected.
Table 2: Organic chemicals evaluated for safety of biosolids land application [11].
Goto home»