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f 11-6 COMBINATION TREATMENT FOR NITROGEN REMOVAL 755 Four polyethylene modules containing biofibrous peat Distribution system Screened Soil cover effluent Influent - " Treated effluent percolates Screened pump vault into the soil under peat filter Septic tank FIGURE 11-30 r n Definition sketch for peat filter (adapted from Bord na-Mona Corp.). TABLE 11-18 Summary performance data for peat filters used to treat individual household wastewater` . influent Effluent % Constituent Unit cone. conc. reduction BODS mg/L 250-280 <10 96 TSS mg/L 190 <10 95 NH3 as N mg/L 50 c5 .90 Total N as N mg/L 60 <10 80 Total P as P mg/L 7.7 3.2 58 Total coliform NoJ100 mL 3.0 x 106 6.0 X103 99.9 'Adapted from McKee and Brooks(1994)and Henry(1995). I I 11-6 COMBINATION TREATMENT FOR NITROGEN REMOVAL As discussed above,both intermittent and recirculating filters will nitrify septic tank effluent.The degree to which the nitrate will be denitrified depends on the availabil- ity of_a carbon source and the alkalinity of the wastewater. In the literature dealing with nitrogen removal in intermittent and recirculating filters, much of the reported information is confounded statistically because nonstandardized- sampling and analysis protocols are used and the alkalinity of the wastewater is not reported. To enhance the degree of denitrification or total nitrogen removal, a variety of flow f diagrams have been developed (see Chap. 13). Attempts have been made to recycle the effluent from IPBFs through the sep- tic tank to enhance denitrification. Denitrification is enhanced;however,ammonium . and organic nitrogen will remain in the septic tank effluent to limit the overall nitron' gen removal.:An alternative approach for the removal of nitrogen has been developed- by Orenco Systems, Inc. (1996). The approach involves the removal of nitrogen in