Skip to main content

Hydraulic and Oxygen Transfer Characteristics of an Industrial Roughing Filter

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Roughing trickling filters are used to reduce organic loadings ahead of the activated sludge process at one of Merck &Co.'s manufacturing sites. The site is subject to the Pharmaceutical MACT (Maximum Achievable Control Technology) Rule, and must demonstrate required reductions of hazardous air pollutants (HAPs). TOXCHEM+ predictive fate software is used at the site to estimate the reduction and removal of the HAPs during wastewater treatment. Site-specific biodegradation rates of the HAPs can be demonstrated as part of an overall strategy to devise the best approach for achieving compliance with the MACT Rule. Concurrent with a testing program, implemented for determining site-specific biorate coefficients, the hydraulic and oxygen mass transfer characteristics of one of two parallel trickling filters were determined to calibrate the process for the fate model. Tracer studies using fluorescent dye provided an estimated hydraulic retention time of approximately 2 minutes. Dissolved oxygen measurements in the trickling filter feed and effluent revealed the filters as effective oxygenating devices, with an increase in D.O. of 1.0 to 1.5 mg/L through the filter. Off-gas measurements, collected in conjunction with analyses of HAPs, provide an opportunity to determine the oxygen mass transfer characteristics of the full-scale trickling filter. Estimated values of the mass transfer coefficient αKL ranged from 1.92 to 6.59 m/d. The wastewater flow rate (excluding recycle) was found to have a significant effect on the oxygen mass transfer coefficient. Determination of the hydraulic flow characteristics and oxygen mass transfer coefficient in the trickling filter aided the calibration of the TOXCHEM+ fate model for the site, which could then be used for estimating site-specific biodegradation rate coefficients for the HAPs in the trickling filter.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864701802779512

Publication date: 2001-01-01

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 These proceedings are not peer reviewed.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
X
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