Title page for ETD etd-07242012-040030

Type of Document

Master's Thesis

Author

Shugart, Steven Lee

URN

etd-07242012-040030

Title

Phosphorus readsorption on Occoquan sediments

Degree

Master of Science

Department

Environmental Sciences and Engineering

Advisory Committee

Advisor Name	Title
Hoehn, Robert C.	Committee Chair
Randall, Clifford W.	Committee Member
Sherrard, Joseph H.	Committee Member

Keywords

phosphate readsorption

Date of Defense

1976-03-05

Availability

restricted

Abstract

The purpose of this investigation was to determine the extent of
phosphorus readsorption on Occoquan sediments and the amount of subsequent
removal because of settling of the particles with time. Occoquan
sediments were placed in six polyurethane cylinders and submerged. In two separate experiments, the cylinders were driven anaerobic,
which allowed phosphorus, previously bound in the sediments,
to release. The sediment—water system was then reaerated and mixed
with a porous air diffuser. Analyses were conducted before and after
the mixing period.
From the results obtained, the following conclusions were drawn:
phosphate readsorption occurred upon mixing the system, and as the
turbidity decreased, the phosphate concentration decreased; phosphate readsorption occurred in a two—step process; each suspension tended
toward equilibrium after mixing; interstitial waters contributed significant
amounts of phosphorus upon mixing of the sediment—water
systems; Occoquan sediments released variable amounts of phosphorus
even within samples from similar sites; sediments from the Occoquan
Creek arm contained less phosphorus than Bull Run sediments; and
sediments low in phosphorus concentrations removed greater amounts
of phosphorus in a shorter period of time.

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