If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com


$17.50 plus tax (Refund Policy)

Buy Article:


To assess the efficacy of onsite wastewater systems (OWS) to protect public health, an existing watershed model was enhanced with the algorithms for a biozone that develops in a soil system receiving septic tank effluent. Biozone is a biologically active soil layer, about 2 cm in thickness, which can further treat the effluent. The model formulations include microorganisms growing on organic matter (BOD) fed by the septic tank effluent. The field capacity of the biozone increases with bacteria biomass, which retains water like a sponge. The porosity of the biozone decreased with the build up of dead bacteria and solid residue. As the gap between field capacity and porosity is reduced over time, the infiltration rate decreases and in some systems this can lead to hydraulic failure of OWS. The model coefficients were calibrated with data collected in laboratory experiments, in which high doses of septic tank effluent were applied to the 60 cm sand columns. The coefficients were adjusted such that the high dose stimulated the rapid growth of bacteria in 30 to 60 days, when the infiltration rate was reduced to a trickle as observed in the experiments.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864702784164686

Publication date: January 1, 2002

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more