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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Pp. 497-504 in On-Site Wastewater Treatment, Proc. Ninth Natl. Symp. on Individual and Small Community Sewage Systems (11-14 March 2001, Fort Worth, Texas, USA), ed. K. Mancl., St. Joseph, Mich. ASAE  701P0009.(doi:10.13031/2013.6056)
Authors:   L.D. Hepner, J.A.Valentine, C.Weber, R. Johnson, T. Christie
Keywords:   Fecal Coliforms, On-site wastewater treatment, Wastewater disposal

On-lot system technology components in use or under evaluation were reviewed from published reports, direct contact with researchers, regulators, and industry people. A database was developed to organize, store, and access this information. Six system technologies (A through F) consisting of various primary treatment components, secondary treatment components, and soil-based components were chosen for study. Technology A was a constructed wetland system. Technology B consists of a denitrification system coupled with an at-grade pressure distribution soil absorption system. Technology C consists of the evaluation of four different types of sand filters. Technology D couples an intermittent sand filter with a time dosed pressure distribution soil absorption area. Technology E couples an intermittent sand filter with a drip or trickle irrigation system. Technology F uses septic tank effluent coupled with a time dosed at-grade pressure distribution system. The proposed technologies could provide options for 8.5 million ha (21 million acres) in Pennsylvania. Full-scale systems to handle 1512 L/day (400 gpd) flow were constructed on the campus of Delaware Valley College in Doylestown Pennsylvania. Data on Fecal Coliform, Fecal Streptococcus, total nitrogen, nitrates, total phosphorus, BOD, COD, and suspended solids, were collected for two years. This paper will report primarily on Fecal Coliform reductions by the systems. All systems showed significant reductions at the 95% confidence interval.

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