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-- ` �EUI6N n�lA Nu fel. <br /> ?J, <br /> I <br /> SECTION 6 <br /> a RATIONAL DESIGN APPROACH AND DESIGN GUIDELINES <br /> e A rational overland flow design procedure based on the organic removal <br /> model developed in Section 4 is presented and illustrated with a numerical <br /> example. In addition, general design and operating guidelines derived from the <br /> field studies are set forth. <br /> RATIONAL DESIGN APPROACH <br /> I Removal of BOD and TOC from raw municipal wastewater and primary <br /> effluent by the overland flow process can be predicted by the following model <br /> as described in Section 4. <br /> C-c - A exp(-Kz) (5-1) <br /> C <br /> 0 <br /> The value of c is 5 for the BOD removal model and 7 for the TOC removal <br /> model. The values of coefficients A and K depend only on the application rate <br /> r (q). Thus, organic removal is a function only of the parameters slope length <br /> (z) and application rate (q) and design may be based on these parameters. <br /> General Design Procedure <br /> The following design procedure is based on BOD and TOC removal and <br /> nitrogen removal is not considered. If nitrogen or ammonia removal is a design <br /> consideration, then selection of values for design parameters will probably be <br /> dictated by nitrogen removal requirements. More complete design guidelines <br /> for nitrogen removal are being developed by current research. Until such <br /> information is available, the nitrogen removal curves presented in Figures 4-4 <br /> through 4-8 may be used as a basis for selecting design parameters. <br /> -61- <br />