||Physical-Chemical Nitrogen Removal from Municipal Wastewater.
Casse, Alan F. ;
Pressle, Thomas A. ;
Schu, Walter W. ;
Bisho, Dolloff F. ;
||Robert A. Taft Water Research Center, Cincinnati, Ohio. Advanced Waste Treatment Research Lab.
( Chemical removal(Sewage treatment) ;
( Sewage treatment ;
Chemical removal(Sewage treatment)) ;
Ion exchanging ;
Performance evaluation ;
Pilot plants ;
Physical chemical treatment ;
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Selective ion exchange for ammonia removal, using the natural zeolite, clinoptilolite, was applied to lime clarified and filtered raw wastewater both before and after carbon adsorption. Intermittant operation of the ion exchange unit with minimum operator surveillance produced an average of 75% removal of NH3-N over a 10 month period. Breakpoint chlorination for ammonia removal was also studied by applying it to filtered secondary effluent and to selective ion exchange effluent. Chlorination of filtered secondary effluent in an agitated reactor removed essentially all the NH3-N with 95% conversion to N2 gas. Process variables are discussed.