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TREATMENT OF 1,2-DIBROMO-3-CHLOROPROPANE AND NITRATE-CONTAMINATED WATER WITH ZERO-VALENT IRON OR HYDROGEN/PALLADIUM CATALYSTS. (R825689C054,R825689C078)
Citation:
Siantar, D. P., C. G. Schreier, C. Chi-Su, AND M. Reinhard. TREATMENT OF 1,2-DIBROMO-3-CHLOROPROPANE AND NITRATE-CONTAMINATED WATER WITH ZERO-VALENT IRON OR HYDROGEN/PALLADIUM CATALYSTS. (R825689C054,R825689C078). WATER RESEARCH. Elsevier Science Ltd, New York, NY, 30(10):2315-2322, (1996).
Description:
Abstract
The abilities of zero-valent iron powder and hydrogen with a palladium catalyst (H2/Pd-alumina) to hydrodehalogenate 1,2-dibromo-3-chloropropane (DBCP) to propane under water treatment conditions (ambient temperature and circumneutral pH) were compared. DBCP reacted with iron powder (100-200 mesh, 36 g/l) in HEPES-buffered water (pH = 7.0) with a t of 2.5 min and in different groundwaters (pH = 8.2-8.7) with a t
ranging from 41-77 min. Dissolved O2 and NO-3 slowed the transformation, whereas sulfate and nitrite had little effect. Iron removed 60 mg/l of nitrate within 14 min with nitrite as an intermediate. In 75 ml groundwater containing 22.5 mg 1% Pd-alumina catalyst under 10% H2 partial pressure, DBCP was transformed to propane within minutes. The rate in groundwater was slower by about 30% compared to Milli-Qtm water. SO2-4, NO-3, Cl- or O2 added to Milli-Q water only slightly inhibited DBCP transformation by H2/Pd-alumina, while SO2-3 had a much stronger inhibitory affect.
Author Keywords: chlorinated hydrocarbons; DBCP (1,2-dibromo-3-chloropropane); nitrate; oxygen; hydrogen; iron metal; palladium catalyst; hydrodechlorination; dechlorination; reduction