are the same as in models (1) - (3). In models (4) and (5), the term 

 D(Nj-N) shows the influx of nitrogen into the reactor; k x NH is the net con- 

 sumption of nitrogen by bacteria (difference between consumption and exre- 

 tion); k^P is the excretion of nitrogen by protozoa; k 2 NH and k 3 NH are the 

 growth of bacteria and the consumption of organic matter by the bacteria 

 per unit time. 



To determine the rates of f 

 ponents, it is necessary to cal 

 kj and k 2 were calculated by su 

 values of the components and eq 

 zero. For the experiments with 

 k 2 = 0.004; for the experiments 

 Coefficients k M and k 5 of model 

 culated by introducing into the 

 model (1). They were for model 

 k k = 0.02. Coefficients k 5 of 

 efficient) taken from our previ 

 jaculans on bacteria (Umorin, 1 

 Since k 5 /k 4 x 100% = ki, then k 

 from the third equation of mode 



eeding and reproduction of the 

 culate the Ki coefficients. Th 

 bstituting into model (1) the s 

 uating the right members of the 

 phenol, they appeared to be ki 

 with glucose, k x = 0.032 and k 

 (2) and k 3 and k 4 of model (3) 



living com- 

 e coefficient 

 teady-state 

 equations to 

 = 0.008 and 

 2 = 0.009^. 

 were cal- 

 and k 2 from 

 r model (3) 

 Y (yield co- 

 lagellate P. 

 al to 33%. 

 0.006. Coefficient k 6 was calculated 

 1 (3). It appeared to be equal to 0.002. 



se systems the coefficients ki 



(2) k, = 0.051, k 5 = 0.024; fo 

 model (3) was determined using 

 ous work on feeding of the zoof 

 975). That coefficient was equ 



Since in the experiments the concentration of nitrogen with its defici- 

 ency was not determined, coefficients k 2 and k 3 of model (4) were taken 

 from another experiment which had been performed to evaluate the dependence 

 of the specific growth rate of bacteria u upon the source concentration of 

 nitrate nitrogen (N). Phenol at a concentration of 25 mg/liter was used as 

 the source of organic carbon. The results of this experiment (average 6 re- 

 petitions) are provided in Table 2. 



TABLE 2. DESTRUCTION OF PHENOL WHEN LIMITED BY NITROGEN 



Judging by the amount of bacterial growth for a period of 10 hrs,, the 

 nitrogen concentration in the experiments decreased by a negligible value 



1 



,-l^r-l 



All the k n - coefficients have a dimension of liter-mg hrs 



137 



