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
  • phosphate readsorption
Date of Defense 1976-03-05
Availability restricted
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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