Laserfiche WebLink
100 <br /> o <br /> ti. <br /> 80 as Estimated Line <br /> of Best Fit <br /> ° <br /> 60 <br /> 0 <br /> E <br /> u <br /> a: 40 <br /> N <br /> N <br /> H <br /> 20 (o)Section A <br /> (•)Seation B <br /> (G) Section C <br /> 0 20 40 60 80 <br /> T,Average Detention Time (min) <br /> Figdre 8. Total suspended solids removal efficiency vs detention time. <br /> Peters et at. (1980) report removal of algae at low of nitrogen, raw wastewater or primary effluent <br /> application rates. should be applied because these wastewaters contain <br /> very little nitrate. <br /> Nitrogen removal This study focused on the kinetics of ammonia <br /> j A number of mechanisms are involved in nitrogen removal because it is the nitrogen form of most con- <br /> removal, including volatilization,nitrification-deni- cern in discharge limitations. The correlation between <br /> i trifcation,adsorption, plant uptake and soil storage. ammonia removal and detention time obtained from <br /> The ammonia form of nitrogen can be removed by CRREL data is shown in Figure 9. The first-order <br /> any of the above mechanisms. Most of the organic equation which closely fits these data (r=0.91) is <br /> nitrogen is initially removed by sedimentation and also shown in Figure 9. For ammonia removal the <br /> then incorporated into the soil or converted to coefficients A and k were 0.81 and 0.03 min' re- <br /> ammonia by saprophytic bacteria. Nitrate is the spectively. <br /> most difficult form of nitrogen to remove (Jenkins It is interesting to note that both BOD and ammonia <br /> et al. 1978,Walter 1974). Nitrate ions have little removal equations (see Fig. 6 and 9) contain the same <br /> affinity for soil particles and thus are not retained kinetic rate constant(k =0.03 min'), suggesting <br /> e <br /> on the overland flow terrace. For efficient removal that both BOD and ammonia removal are controlled <br /> loo <br /> 0 <br /> C. <br /> 80 NH3-N Removal(%I•l1-0.81 eo.os7)10 ' <br /> ° =0.91 <br /> p pA <br /> ° 60 <br /> i <br /> i o <br /> z 40 � <br /> i <br /> Z <br /> (o) Section A <br /> 20 l•) Section B <br /> (6) Section C <br /> 0 20 40 60 80 <br /> T, Average Detention Time (min) <br /> Figure 9. NH3-Nremoval efficiency vs detention time. <br /> 10 <br />