Chloramines V: Products and Implications of the Chlorination of Lysine in Municipal Wastewaters
摘要:
The chlorination reactions of lysine (Lys) in water and wastewater were studied. 5-Chloraminopentanal (VIII) and 5-dichloraminopentanal (IX) are the main products at Cl-2/Lys molar ratios of I and 2 after 30-min contact time. Formation of N,N-dichlorolysine (V) was suggested but not confirmed. 5-Dichloramino-N-chloropentanimine (XII) and 5-dichloraminopentanenitrile (XV) are the main producs at Cl-2/Lys molar ratios of 4 and 5. At a Cl-2/Lys molar ratio of 3, a compound believed to be 5-chloramino-N-chloropentanimine (XI) was observed, but its yield was small. Half-lives of lysine chlorination products in model solutions were found to be as follows: 0.8 (V), 1.5 (XI), 23 (XII), >45 (VIII and IX), and 210 h (XV). The concentrations of lysine and its chlorination products after 30-min contact time were determined in a primary municipal wastewater. All have the potential to interfere with the proper measurement of disinfection levels in chlorinated wastewaters.