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reliability and maintainability. (A 1997 Yavapai County, Arizona, study of individual home aerobic <br /> systems with chlorinators found that 85% of the chlorinators were not operating properly. This study <br /> concluded that"the simple but maintenance intensive operation of chlorination is often overlooked by <br /> the homeowner, and is difficult for an operator on a monthly or quarterly visit to keep up to standard <br /> (ADEQ, 1997).") <br /> Textile Filter <br /> Fih.te i+—fine <br /> - - --- <br /> 2 Companment 1500 Gallon fJnuem WW sy mn <br /> Septic Tank Polishing Sand Filter <br /> Figure 4: Burnett,WA Textile Filter System Schematic <br /> Habitat for Humanity 1, Lapine, Oregon <br /> Sponsored by Oregon's Department of Environmental Quality(DEQ) and Deschutes County, this textile <br /> filter system (Figure 5) for a single family home was installed in November, 1998, as part of a five-year <br /> project to evaluate new and innovative technology for denitrification of septic tank effluent. The <br /> system is monitored monthly by DEQ. Testing is performed at four locations throughout the treatment <br /> Oak system and at a monitoring well down gradient of the disposal field. This system is expected to produce <br /> BOD, TSS, and total nitrogen of less than 10 mg/L and fecal coliform count of less than 400 MPN per <br /> 100 milliliters. Average results for the three tests performed since the first week of May 1999, are <br /> shown below. DEQ will also be evaluating long-term and sustainable maintenance performance over a <br /> five-year period. <br /> Lapine, Habitat 1 Flow BODS TSS TKN NO3-n TN FC <br /> gpd mg1L mg1L mg1L mg1L mg1L MPN/100 ml <br /> Textile Filter Effluent 330 6.7 3.8 2 6 8 > 1000 <br /> I <br /> fTeuile Filter _ <br /> A—by S <br /> ArnWy <br /> 2 Com�petmem 1500 Gallon <br /> 1' Septic Tank <br /> � roa.ao.p..euea <br /> draiefeif <br /> f?nYdieM <br /> pwnp 6asw <br /> i� <br /> Figure 5: Lapine,Habitat 1 Textile Filter System Schematic <br /> NTP-FLT-TRB-ES8-HL8.l <br /> 2100 <br /> Page 7 <br />