Skip to main content

Chemically Mediated Phosphorus Removal: Optimization of Analytical Methods

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:

Phosphorus regulations for wastewater effluents are moving to concentration ranges of 10-100 μg P/L (total phosphorus). The analytical methods for low level phosphate analysis need to be optimized to perform reliably and accurately at these low levels. To accomplish this, absorbance measurements with long path lengths, 10 cm and 1 m cells, are performed. The ascorbic acid method (Standard Methods 4500-P. E.) was modified for a 10 cm path length to use a colorforming reagent volume 30% of the volume recommended by the Standard Method and a color development time of 1 hour. The same reagent volume is recommended for a 1 m path length with color-development overnight (24 hours). Additionally, a filtration protocol is necessary to better define the “dissolved” fraction in synthetic iron and phosphate solutions used to model chemically mediated phosphorus removal. It was found that a 0.45 μm syringe filter gives variable results, likely due to a build-up of tiny (less than 450 nm) iron colloids on the filter. For jar tests designed to evaluate chemically mediated phosphorus removal, the protocol to achieve the lowest reproducible orthophosphate concentration employs a 47mm diameter Millipore filter, filtration at a rate of 250 mL/hour and a filtered volume of 10 mL.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864708788733125

Publication date: January 1, 2008

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 These proceedings are not peer reviewed.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/2008/00002008/00000013/art00056
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