Skip to main content

Footprints and Capital Costs Reduction for Onsite Wastewater Treatment Systems - a Novel Dual Media Recirculating Biofilters

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


The purpose of this study was to develop a dual media filter bed design for recirculating biofilters (RBFs) for achieving high level treatment to meet the strict wastewater discharge regulations. Five types of filter media were applied in the bench scale RBFs, including two single media (crushed glass or CG, geotextile or GT), and three dual media with CG and GT at different volume ratios (3CG:1GT, 2CG:2GT, and 1CG:3GT). These five types of RBFs were dosed with both low and high hydraulic loading rates (HLR) of 0.20 and 0.80m3 /m2/day, respectively. The effluent parameters including BOD5, NH4 +-N, NO3-N, TN, TSS, pH, and fecal coliform were measured and statistically analyzed.

The results showed that the dual media RBF of 3CG:1GT dosed with both low and high hydraulic loading rates (HLRs) provided the highest removal for BOD and TSS amongst six dual media RBFs in this study. More importantly, the dual media RBF of 3CG:1GT dosed with the high HLR produced effluents with BOD concentrations even lower than the CG biofilter dosed with a low HLR. However, three clogging occurrences were observed for the CG biofilter dosed with the high HLR during the experimental period, while no clogging problem was found for all the dual media RBFs. This conclusion indicated that the dual media RBF of 3CG:1GT could decrease the footprints for RBFs significantly since HLRs and daily flow rates determine the size of filter beds.


Document Type: Research Article


Publication date: 2007-10-13

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 These proceedings are not peer reviewed.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
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
Cookie Policy
Ingenta Connect 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