Fate of sulfur(IV) dechlorinating agents in natural waters: effect of suspended sediments
To investigate the fate of SO/sub 2/ in dechlorinated waste water effluents, oxidation rates were measured in nonilluminated solutions at near-neutral pH and 25/degrees/C. River water was simulated with 0.01 M NaCl, 0.001 M buffer, and 1 g/L standard sediment MESS-1. Components leached from the sediment catalyzed the oxidation of S(IV) by O/sub 2/, but the particles themselves exerted a slight inhibitory effect. Sulfate was the major reaction product. Some nonoxidative loss of S(IV) to particles was observed at high-sediment concentrations (20 g/L). Sulfur(IV) reductively dissolved 25% of the Cu from the sediment, possibly an environmentally harmful process. Iron and manganese dissolutions were insignificant. The rate of loss of S(IV) from air-saturated solutions covering a 50-fold S(IV) concentration range as well as described by the empirical equation (time in s and concentrations in M) -d(SO/sub 3//sup 2 -/)/dt = (5 /times/ 10/sup -8/)((S(IV))/(1 + (H/sup +/)/K/sub a/))/sup 1/2/ K/sub a/ being the second ionization constant of H/sub 2/SO/sub 3/. The rate of loss of S(IV) was a factor of 2 faster in actual effluent/river water mixtures, likely caused by higher trace metal concentrations in these mixtures.
- Research Organization:
- Univ. of Maryland, College Park (USA)
- OSTI ID:
- 6147143
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 22:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SULFATES
OXIDATION
SULFUR DIOXIDE
DISSOLUTION
WASTE WATER
DECHLORINATION
ECOLOGICAL CONCENTRATION
LEACHING
MIXTURES
SEDIMENTS
SIMULATION
WATER POLLUTION
CHALCOGENIDES
CHEMICAL REACTIONS
DEHALOGENATION
DISPERSIONS
HYDROGEN COMPOUNDS
LIQUID WASTES
OXIDES
OXYGEN COMPOUNDS
POLLUTION
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES
WATER
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)