TY  - BOOK
AU  - Chalermraj Thanantaseth
AU  - Watanabe,Yoshimasa
AU  - Nguyen,Cong Thanh
AU  - Samorn Muttamara
ED  - Royal Danish Government, 
TI  - Kinetic model of biological oxidation in rotating biological contactors
T2  - Thesis
PY  - 1981///
CY  - Bangkok
PB  - Asian Institute of Technology
KW  - Sewage
KW  - Purification
KW  - Rotating disc process
KW  - Nitrogen removal
N1  - A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development; Thesis (M.Eng.) - Asian Institute of Technology, 1981
N2  - The major problem of the treatment efficiency for nitrification is the existence of BOD5 in the wastewater. The model was developed to explain  the phenomena occurring in the rotating biological contactor unit base on the property of substrate diffusion and the degree of zero order biological  reaction within the biofilm. The active biofilm are divided into outer layer of heterotrophic and inner layer of nitrifying microorganism due to lower diffusion coefficient but higher biological reaction of organic carbonaceous substrate than the ammonia-nitrogen, and so, the nitrification rate will depend on the oxygen and ammonia-nitrogen concentration, on the  nitrifying surface, left from the heterotrophic utilization.  Experiments with low influent BOD5 concentration were carried on to prevent oxygen limitation in the heterotrophic layer and to be able to observe the reduction of oxygen penetration into the nitrifying layer. The experimental variables were hydraulic loading, influent BOD5, and the type of organic carbonaceous material. Experimental results show that higher BOD5/N ratio together with higher hydraulic loading caused the lowering in  nitrification rate. These were adequate explained by the proposed model
UR  - http://203.159.5.9/ait-thesis/detail.php?q=B21614
ER  -