Skip to main content

THE REALITY OF ATTAINING PLANT EFFLUENT PHOSPHORUS LIMITS OF LESS THAN 0.07 MG P/L

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial

Abstract:

Three to four years of operating data at the Rock Creek Advanced Wastewater Treatment Facility (AWTF) and Durham AWTF were examined with to determine the reality of achieving very low phosphorus levels in a wastewater plant effluent. Both plants are required to achieve a median total phosphorus (TP) level of 0.07 milligram phosphorus per liter (mg P/L) in their effluent during the period analyzed. The Rock Creek plant phosphorus removal system uses a combination of alum addition in chemically enhanced primary treatment, tertiary clarifiers, and granular media filters. The Durham AWTF phosphorus removal system uses biological phosphorus removal, alum addition in tertiary clarifiers, and granular media filters.

Analysis of the data shows that both plants can and do achieve reliable phosphorus removal to these levels. However, there were distinct differences. The biological phosphorus removal system at Durham appears to add an increased level of variability in the process performance as compared to the purely chemical removal systems in place at Rock Creek. However, the alum usage at Rock Creek is significantly higher (approximately 70 milligrams per liter [mg/L] total versus 45 mg/L total at Durham).

Both plants exhibit a minimum soluble phosphorus level (0.01 to 0.02 mg P/L) that does not appear to be affected by increased alum addition. Both plant “overdose” the alum beyond that needed for simple soluble phosphate removal in order to “dilute” the tertiary clarifier solids with non-phosphorus bearing solids. This practice reduces the particulate phosphorus concentrations, thus allowing the plants the reliably meet their effluent targets. At the Durham AWTF the median value for the effluent TP was 0.047 mg P/L. At the Rock Creek AWTF, the median value for the effluent TP was 0.043 mg P/L.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864705783815348

Publication date: January 1, 2005

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
wef/wefproc/2005/00002005/00000009/art00019
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

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
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