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C) <br /> 740 CHAPTER 11: Intermittent and Recirculating Packed-Bed Filters - <br /> (a) (b) <br /> FIGURE 11-18. <br /> Views of typical recirculating gravel filters: (a) typical example for small community and <br /> (b) small household unit in fabrication yard. <br /> Fig. 1-1. The wastewater management system that was designed and constructed <br /> incorporates a number of innovative technologies (see Fig. 11-20) (Crites et al., <br /> 1997). The system includes the use of 1500-gal two-compartment watertight septic <br /> tanks with screened effluent filter vaults,high-head effluent pumps,a small-diameter <br /> variable-grade sewer, two pressure sewers, a recirculating granular medium filter <br /> 3� v . <br /> G' <br /> a r <br /> 'M FIGURE 11-19 <br /> View of prefabricated recirculating <br /> gravel packed-bed filter delivered <br /> F_4 to home site, ready to install. <br />