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in <br /> 4 <br /> 1.1-3 SINGLE-PASS (INTERMITTENT) PACKED-BED- 717 <br /> i <br /> I - <br /> I 24 12 in in 2011 Orifice 12 in <br /> ii <br /> 1 <br /> 1.25 in PVC manifold ' <br /> 24 in <br /> i 30 mil PVC liner <br /> Il 4 in slotted <br /> PVC pipe <br /> To drainfield <br /> From septic tank MCI or pump basin <br /> 18 It .. <br /> Distribution valve <br /> Flushing valve <br /> housing <br /> Lt <br /> Air coil(optional) <br /> 0 <br /> �. <br /> 0.75 in PVC lateral with 0.125 in <br /> orifices facing upward <br /> n <br /> (a)Plan view <br /> PVC lateral with Flushing valve <br /> orifice shields <br /> Fitter fabric Air coil system <br /> Valve box <br /> 0.5 to 0.75 in rock <br /> Filter sand <br /> .375 in pea gravel Air col!(if used) <br /> 0 <br /> 0.5 to 0.75 in rock To drainfield or <br /> pump vault <br /> A in slotted PVC 30 Mil <br /> underdrain pipe PVC liner <br /> i <br /> (b)Typical cross section <br /> FIGURE 11-9 <br /> Schematic of modern intermittent sand filter: (a) plan view and (b) typical cross section <br /> (courtesy Orenco Systems, Inc.). ' <br /> i <br /> t <br /> -.be edonomical for flows up to 3000-ga1/d (Ball, 1996). The use of the effluent from <br /> �IPBFs for recycling applications has proven to be quite successful because of the . <br /> high quality of the effluent that is produced. Drip irrigation is the most common <br /> method of applying the treated effluent in reuse applications. It should be noted, <br /> however, that drip irrigation is not yet allowed in many,parts of the country, although <br /> this method of application has been used successfully for a number of years in the <br /> southeastern part of the United States. <br />