Phosphorus Speciation Provides Direction to Produce 10 μ g/L
Increasing demand to achieve very low effluent total phosphorus due to more stringent discharge limits have raised questions on the limits of available technologies and presented challenges of how to further the removal of phosphorus to extremely low levels (e. g 10 μg/L). This study investigated the phosphorus speciation in effluents from various available technologies, including both conventional secondary chemical P or biological P removal processes, and more advanced tertiary treatment processes at full-scale or pilot-scale. Phosphorus speciation analysis in effluents from different treatment processes showed various fractions and composition that seem to be associated with fundamental mechanisms of each processes. Effluent from chemical P removal process consists mainly of soluble reactive P and refractory organic P, while effluent from biological P removal process (EBPR) showed presence of hydrolysable polyP at nearly 20 percent in the effluent, in addition to the other two fractions. Advanced tertiary treatment process that have multiple stages and apply filtration, coagulation and adsorption, showed very efficient TP removal down to approximately 20 μg/L level. P speciation analysis of these tertiary effluents shows that dissolved (soluble) refractory organic P (rDOP) is the dominant component. Refractory organic phosphorus, ranged from 0.01 to 0.05 mg/L, was present in all secondary and tertiary effluents studied and they seem to be mostly in "soluble" form (pass 0.45 um filter). Enhanced removal of rDOP observed with coagulant additions indicates that most rDOP are likely in colloidal form and they are susceptible to coagulation/flocculation. Membrane microfiltration process showed very efficient particulate phosphorus removal; however, the removal of soluble P fractions including both soluble reactive P (ortho-P) and rDOP were not as effective as other tertiary treatment processes studied. rDOP are the residual refractory P that is shown to be difficult to remove even in advanced tertiary treatment processes. Investigation on the characterization and treatability of rDOP is, therefore, necessary for developing technologies to further the removal of TP to extremely low levels, which may be imposed by more stringent P limits.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 2007-10-01
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. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites