Premium
Process and kinetic analysis of nitrification in coupled trickling filter/activated sludge processes
Author(s) -
Daigger Glen T.,
Norton Lynn E.,
Watson Richard S.,
Crawford Deborah,
Sieger Ronald B.
Publication year - 1993
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/wer.65.6.7
Subject(s) - trickling filter , nitrification , activated sludge , biofilter , filter (signal processing) , sewage treatment , suspended solids , environmental engineering , environmental science , wastewater , chemistry , nitrogen , engineering , organic chemistry , electrical engineering
ABSTRACT:
A model for nitrification in a coupled trickling filter/ activated sludge system is presented. Nitrification will occur in the trickling filter component of the system when the organic loading to the trickling filter is about 1 kg BOD 5 /m 3 · d (60 lb BOD 5 /1000 ft 3 · day); the degree of nitrification will increase as the organic loading decreases below this value. Nitrification in the upstream trickling filter has two impacts on the downstream suspended growth unit. First, partial removal of ammonia by the upstream trickling filter reduces the ammonia‐nitrogen loading on the downstream suspended growth unit. Second, the seeding effect of nitrifiers grown on the upstream trickling filter which slough off and pass into the downstream suspended growth unit allows the suspended growth unit to nitrify at solids residence times that would otherwise preclude nitrification. A mathematical model for the suspended growth units that incorporates this seeding effect is developed and presented. Data from the City of Garland, Texas, Duck Creek and Rowlett Creek Wastewater Treatment Plants are presented that demonstrate this mechanism and verify the predictive capability of the proposed model.