Laserfiche WebLink
t <br /> Author-produced version of the article published in Water and Environment Journal,2015,29(3),360-364. <br /> The original publication is available at:http://onlinelibrary.wiley.com/doi/I 0.1111/wej.12114/pdf doi:10.1111/wej.12114 <br /> a) $ =Inflow <br /> 0 outflow <br /> g <br /> � o <br /> � N <br /> LL pp <br /> O <br /> O <br /> 0.00 0.05 0.10 0.15 0.20 025 <br /> Time(h) <br /> b) <br /> =Inflow <br /> outflow <br /> N <br /> IL O <br /> v1 <br /> O <br /> 0 5 10 15 20 <br /> Time(h) <br /> C) <br /> =inflow <br /> outflow <br /> r a <br /> 3 <br /> 0 <br /> LL <br /> O <br /> 0 5 10 15 20 <br /> 150 Time(h) <br /> 151 Figure 4.Inflow and outflow hydrographs for three test cases:a)bath emptying,b)synthetic daily dataset,c)dry <br /> 152 weather sewage flow(Butler&Gatt,1996) <br /> 153 Conclusions <br /> 154 We built a simple mechanistic model suitable for modeling the hydraulic buffering induced by a septic <br /> 155 tank.The only constant in the model,i.e.the loss coefficient,was calibrated using deterministic CFD <br /> 156 modeling.Results highlight significant modulation of flow in single relatively large events such as a <br /> 157 bath emptying.However,on smoother hydrographs,such as those currently available for <br /> 158 characterizing a household effluent,the flow modulation only adds a lag time into the influent <br /> 159 hydrograph.As we progressively gain more knowledge on the actual shape and amplitude of the <br /> 160 hydrograph at the inlet of a septic tank,this simple tool could prove be useful for modeling septic tank <br /> 161 outflow and its impact on the spread of wastewater over the treatment unit in configurations based on <br /> 162 gravity-driven distribution. <br />