Tannery wastes definition, risk assessment and cleanup options, Berkeley, California
1991; Elsevier BV; Volume: 29; Issue: 1 Linguagem: Inglês
10.1016/0304-3894(91)87075-d
ISSN1873-3336
Autores Tópico(s)Chromium effects and bioremediation
ResumoUnited States tanneries generate up to 100,000 (wet) tons of hair-burn and chrome sludges and contaminated soils. A facility closure investigation at a tannery in Berkeley, California showed sludges containing concentrations of Cr in the range of 1,000 to 40,000 mg/kg on a dry weight basis. California Code of Regulations defines total chromium above a concentration of 2,500 mg/ kg in soil or sludge as hazardous waste. Chromium de- sorption from the soil matrix and Cr solubility are low. Migration of chromium in the soil water occurs either as a soluble Cr(VI) species, HCrO 4− and CrO42− or as Cr(III) or Cr(VI) in soluble complexes with organic or inorganic substances. Investigations at the Berkeley tannery indicate these tannery sludges exhibit low mobility and have Cr(III) to Cr(VI) ratio over 200. A risk assessment was completed to assess the possible effects on public health, but they were determined to be insignificant. Cleanup options evaluated were offsite disposal, encapsulation, or land treatment.
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