The United States Army is currently examining chemical neutralization followed by biodegradation for disposal of the chemical warfare agent sulfur mustard. The acidic hydrolysis of sulfur mustard (“mustard gas”, 2,2′-dichlorodiethyl sulfide), yields a detoxified and biodegradable product typically containing from 80 to 95% thiodiglycol. The hydrolyzed product was typically amended with 1,450 mg/L of ammonium chloride (NH4Cl), 280 mg/L of potassium phosphate monobasic (KH2PO4), and mineral salts and fed to aerobic Sequencing Batch Reactors (SBRs). The SBRs were operated with 3-5 hour aerated Fill, 17-18 hour React, 1 hour Settle and 1 hour Draw periods. The efficiency of carbon removal was greater than 90% and the effluent was non-toxic as determined by aquatic toxicity tests.

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