||Ammonia-Nitrogen Removal by Breakpoint Chlorination.
Pressle, Thomas A. ;
Bisho, Dolloff F. ;
Pint, Adolf P. ;
Casse, Alan F. ;
||District of Columbia Dept. of Environmental Services, Washington, D.C.
||DI-14-12-818; EPA-11010-EYM; 06838,; 670/2-73-058
Sewage treatment ;
Sodium hypochlorite ;
Waste water ;
Pilot plants ;
Breakpoint chlorination ;
Secondary sewage treatment
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In laboratory breakpoint chlorination, sodium hypochlorite oxidized the ammonia in buffered water (with 20 mg/l of NH3-N) and in raw, secondary and lime clarified and filtered municipal wastewaters chiefly to N2 gas with only small amounts of NO3(-)-N and NCl3-N. Stoichiometry and pH effects are discussed. In the pilot plant, gaseous chlorine with sodium or calcium hydroxide for pH control was efficiently mixed with filtered secondary and with lime clarified and filtered raw wastewater. In the breakpoint chlorination of wastewaters, a split chlorine feed technique to use the alkalinity of the water and decrease the amount of base required in the process is described. The instrumentation used in the control of the process and additional instrumentation designed and built to fully automate the process is also described.