Accession Number:

ADA073131

Title:

Evaluation of a Developmental Heavy Metals Waste Treatment System.

Descriptive Note:

Technical rept. May 78-May 79,

Corporate Author:

LIFE SYSTEMS INC CLEVELAND OH

Personal Author(s):

Report Date:

1979-05-01

Pagination or Media Count:

83.0

Abstract:

The Heavy Metals Waste Treatment System, consisting of a precipitation reactor, a precision control and monitor system and an experimental parallel plate clarifier, has been used to evaluate hydroxide and sulfide precipitation processes for removal of heavy metals from industrial wastes containing 0 and 50 seawater. Removal of metals from simulated mixed-metal wastes by hydroxide precipitation was shown to be superior to theoretical projections apparently due to co-precipitation of minor components. However, the studies showed that discharge criteria cannot be met by this process alone for all metals of interest in industrial wastes, particularly if seawater is present. Also, optimum pHs vary for the different metals, and co-precipitation will not be quantitatively reliable. Hydroxide precipitation tests also showed that process demand for hydroxide reagent is roughly comparable to projections in the case of 0 seawater. However, treatment of 50 seawater can require as much as an order of magnitude higher reagent demand at high pH. The hydroxide proces will therefore be uneconomical for testing or pretreating wastewaters containing high proportions of seawater, except at low pHs e.g., 8 to 9.

Subject Categories:

  • Inorganic Chemistry
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE